Price gouging, which is the practice of charging exorbitant prices for goods or services during a time of crisis or shortage, is generally considered unethical.
In the case of a petrol station owner charging rupees 500 a liter, if their store is the only one with petrol, this would likely be considered price gouging. It would be taking advantage of a dire situation for customers who are in need of petrol to power their vehicles and have no other options to purchase from.
Additionally, pricing regulations may exist in the area to prevent such activity, and those regulations should be followed. It's important to remember that the owner has a responsibility to provide goods and services to their community and charging excessively high prices could be seen as exploitation and not in line with fair trade practices.
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It is widely regarded as unethical to price gouge, which is the practise of charging extravagant rates for goods or services during a crisis or scarcity.
If the only store selling gasoline is the proprietor of a petrol station, charging Rs. 500 per litre would probably be regarded as price gouging. It would be exploiting the desperate condition of clients who have no other options and are in need of gasoline services to operate their vehicles. Additionally, price rules that are in place in the region to stop this behaviour should be adhered to. It's crucial to keep in mind that the proprietor has a duty to offer goods and services to their community while avoiding charging exorbitant costs.
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27. Which of the following molecules are chiral? I. 2-Chlorobutane II. 3-Bromopentane
III. 1-Bromo-2-methylpropene IV. 2-Bromo-3-methylbutane
A) I, II B) I, IV C) II, III
D) III, IV
Options i, iii are correct. Chiral molecules are molecules that are non-superimposable mirror images of each other, often referred to as "left-handed" and "right-handed" molecules.
Out of the given molecules, the following are chiral:
I. 2-Chlorobutane: This molecule has a chiral carbon atom, which is the carbon atom that is bonded to the chlorine atom and also to two other carbon atoms. III. 1-Bromo-2-methylpropene: This molecule has a chiral carbon atom, molecules which is the carbon atom It's worth noting that even though the molecule has no chiral atoms, it could still be chiral if the molecule is not symmetrical. that is bonded to the bromine atom and also to the double bond.
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A refrigerator delays the spoilage of food by ________.
A.killing microorganisms
B.slowing down the rate of chemical reactions within microorganisms
C.expanding the water found within microorganisms
D.diminishing the supply of oxygen to microorganisms
A refrigerator delays the spoilage of food by slowing down the rate of chemical reactions within microorganisms. Therefore, option B is correct.
What do you mean by chemical reaction ?The term chemical reaction is defined as the processes, in which substances undergo a chemical change to formed new substances, with all new properties.
Higher temperatures often result in faster chemical reactions. When food is left on the kitchen counter, it can soon become bad. The process is slowed down by the refrigerator's lower temperature, which allows the same food to stay fresh for longer.
Bacteria, molds, and yeasts are all potential sources of microbial deterioration. Food's water activity plays a significant role in determining the type of food decomposition that results.
Thus, option B is correct.
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If there was an argument that these fossils could have crossed the oceans, which two of these would have had the most difficulty swimming across the ocean?
Lystrosaurus
Glossopteris
Mesosaurus
Cynognathus
As per the argument from the the above mentioned species fossils the two species that have the most difficulty in crossing the oceans was Glossopteris and Cynognathus.
what does fossils mean ?
Fossils range in size from one-micrometre (1 m) bacteria[8] to dinosaurs and trees several metres long and weighing many tonnes. A fossil often retains only a component of the deceased creature, generally the section that was partially mineralized during life, such as the bones and teeth of vertebrates or the chitinous or calcareous exoskeletons of invertebrates. Fossils may also consist of markings left behind by the creature when it was alive, such as animal footprints or excrement (coprolites). In contrast to body fossils, these are known as trace fossils or ichnofossils. Some fossils are biochemical and are known as chemofossils or biosignatures.
The Glossopteris was the plant species so that this species cant be able to cross the ocean and the other species was Cynognathus as this species was the land living species this species just looks like the cross or the mixing of the dianosurous and the tiger so that this species also cant cross the ocean.
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The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min?
a. 0.50 mg
b. 1.0 mg
c. 2.0 mg
d. 0.25 mg
e. 4.0 mg
The half life of bromine-74 is 25min. After 75 min. only o.5mg of sample is still active.
Half-life of a radioactive element is time required for the element which undergo disintegration and reduces its initial concentration to half of the concentration.
Therefore, the half-life of the bromine-74 is 25 minute. So we calculate the number of periods.
Half-life = time / no. of periods
No. of period = Time given / [tex]t_{1/2}[/tex]
No. of period = 75 / 25 = 3
The number of periods is three and in each period half of the amount of the initial concentration of the elements will disintegrates.
So, 6mg disintegrates into 4 / 2 and then 4 / 4 and then 4 /8
4mg→ 4 / 2→ 4 / 4→ 4 / 8
The final value will be 0.5 mg.
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A substance is present in the gaseous state at room temperature. Which of the following best explains the probable position of the substance in the periodic table?
1. It is between groups 1 to 12 because it is a metal.
2. It is between groups 13 to 18 because it is a metal.
3. It is between groups 1 to 12 because it is a non-metal.
4. It is between groups 13 to 18 because it is a non-metal.
A substance that is present in a gaseous state at room temperature would be between groups 13 to 18 on the periodic table because it is a non-metal. Option 4.
Gaseous elementsGaseous elements are elements that are in gaseous states at room temperature. They are usually found concentrated in the upper right corner on the right side of the periodic table.
Some of the gaseous elements include elements in group 18 which are collectively known as the noble gases, nitrogen in group 15, oxygen in group 16, and so on.
Even though some elements that exist as gases at room temperature can be found in other groups outside of groups 13 to 18, gaseous elements are concentrated between the referenced groups.
In other words, a substance that is present in the gaseous state at room temperature will most likely be between groups 13 to 18 of the period table.
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ALSO FOR 13 help asap please
Answer: 1 absolute zero
2. melting point
3.Sublimation
4.
5.Molecule
6. element
7.plasm
8.homogenous mixture
9.celsius
10. Liquid
11.catenation
12deposition
13.
Explanation:
What is the molecular geometry of SeCl2
Trigonal pyramidal: The correct response is Thionyl chloride structure, revealing trigonal pyramidal shape.
What is the shape of the molecule SeCl2?Tetrahedral: In a very early study of the vapor from solid SeCLi using electron diffraction, Lister and Sutton came to the conclusion that the SeCL molecule is (distorted) tetrahedral with a (mean) SeCl bond distance of 2.13 0.04 [13].
SeCl2 chemical: SeCl2 is twisted or V-shaped because the main atom possesses four pairs of electrons—two bonding pairs and two lone pairs. As a result, SCl2 possesses a tetrahedral form and bent molecular geometry in nature. Two Chlorine atoms around a single Sulfur atom to form SCl2.
The tetrahedral molecular structure of SO2Cl2 has an asymmetric charge distribution on its core atom. This molecule is hence polar. Sulfur dichloride has a tetrahedral electron shape. With two bond pairs and two lone pairs, the molecular geometry is twisted.
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Why is it important to exposing sodium borohydride to moisture?
Answer choices
space 1. Sodium borohydride is a mild reductant, but water can amplify its reactivity and make it too strong of a reductant.
space 2. Sodium borohydride ignites when it comes into contact with water.
space 3. Sodium borohydride is hygroscopic and when it reacts with water it loses a hydride and no longer can be used as a hydride source.
space 4. Sodium borohydride polymerizes in the presence of water to form an amorphous gooey solid that is difficult to handle.
space 3. Sodium borohydride is hygroscopic and when it reacts with water it loses a hydride and no longer can be used as a hydride source. So, it is important to exposing sodium borohydride to moisture.
Sodium borohydride, also known as sodium tetrahydridoborate or NaBH4, is a chemical compound often used as a moisture reducing agent in organic chemistry. It is a white, crystalline powder that is highly reactive and flammable. It is important to keep sodium borohydride away from moisture as it is hygroscopic, meaning it absorbs moisture from the air. When sodium borohydride comes into contact with water, it loses a hydride ion and is no longer able to function as a hydride source in chemical reactions. This reduces the effectiveness of the reagent and can lead to unsuccessful reactions or the formation of byproducts.
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what happens to the temperature of a mug of hot cocoa when cold milk is mixed in
Answer:
Hot chocolate powder dissolves more quickly in hot water because it is a liquid at room temperature.
Explanation:
When you pour cold milk into hot cocoa, the milk and cocoa particles start to collide When a high-energy cocoa particle hits a low-energy milk particle, energy transfers. The cocoa particles slow down, and the cup of cocoa cools down.
“16.2gAl x 1 mol Al/ 26.98gAl x 6.022 x 10^23 Al atoms/1 mol Al” and please explain
The number of atoms in 16.25 g of Al is calculated here. One mole or 26.98 g of Al contains 6.022 × 10²³ atoms. Thus, the atoms in 16.25 g or 0.60 mol of Al contains 3.62 × 10²³ atoms.
What is one mole ?Any substance containing 6.022 × 10²³ atoms is called one mole of that substance. This number is called Avogadro number. Therefore, one mole of every substances contains Avogadro number of atoms. The mass of one mole of an atom is called its atomic mass.
Al is 13th element in periodic table. Its atomic mass is 26.98 g/mol. Thus, the number of moles of 16.25 g of Al is calculated as follows:
no.of moles = given mass/atomic mass
= 16.25/26.98 =0.60 moles.
1 mole of Al contains 6.022 × 10²³ atoms. Thus, 0.60 moles contains 6.022 × 10²³ × 0.60 = 3.62 × 10²³ atoms.
Therefore, to calculate the number of atoms in a given number of moles of an element multiply the number of moles with Avogadro's number.
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Create the orbital diagram for sodium.
An orbital diagram, also known as an orbital filling diagram, is a type of notation that depicts the electron distribution and electron spin within orbitals of an atom.
What is the orbital diagram of sodium?Sodium (Na) seems to have the electronic configuration 1s2 2s2 2p6 3s1. The 1s, 2s, and 2p orbitals are paired because they each have two electrons; moreover, the 3s orbital have only one electron, leaving Sodium with one unpaired electron.The energy levels of the 2s and 2p sublevels, as well as the 3s and 3p sublevels, are very close. On the page, the s sublevel is located beneath the p sublevel.Chemical bonds between substances contain energy. During the course of a reaction, exothermic reactions generate both heat and chemical energy. In quantum theory, a sublevel is defined as an energy level. Sublevels in chemistry explains electron-related energies.In physics, sublevels also can refer to nuclear energy levels. The s-sublevel is made up of a single orbital that can hold up to two electrons. Spherical is the best way to describe it. The 1s is the particle closest to the nucleus because it is smaller than the 2s, which is smaller than the 3s, and so on. The p-sublevel is made up of three identical orbitals that are similar.To learn more about orbital diagram refer to :
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Write the name for Ba 3(PO4)2
O barium phosphate
O barium phosphite
O barium (ll) phosphite
O barium (III) phosphite
O tribarium phosphorustetraoxide
The correct name for Ba3(PO4)2 is barium (III) phosphite. The name reflects the fact that the compound contains three barium cations and two phosphate anions, with the barium cations having an oxidation state of +3.
Chemical nomenclature is the formal system of naming chemical compounds. It is based on certain rules and conventions, and allows scientists to quickly and accurately identify and communicate the structure and composition of a compound.
The rules of chemical nomenclature vary depending on the type of compound, but generally involve assigning the correct prefix, suffix, and stem to the compound. The prefix indicates the type of element present in the compound, the stem indicates the number and arrangement of the atoms, and the suffix indicates the type of bonding and the type of compound. For example, the name for H2O is "dihydrogen monoxide" because the prefix "di" indicates two atoms of hydrogen, the stem "hydrogen" indicates that the compound contains hydrogen atoms, and the suffix "oxide" indicates that it is an oxide compound.
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How many sigma bonds and pi bonds does this molecule have?(CH3)2CCHCH2CCCOOH
The sigma bonds and pi bonds does the given molecule have is :
(CH₃)₂CCHCH₂CCCOOH , 19 sigma bond and 4 pi bond.
What is a molecule example?Molecules of compounds have atoms of two or more different elements. For example, water (H2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom. Methane (CH4), a common greenhouse gas, has five atoms, one of carbon (C) and four of hydrogen .
Does molecule mean atom?A molecule is two or more atoms connected by chemical bonds, which form the smallest unit of a substance that retains the composition and properties of that substance. Molecules form the basis of chemistry. Molecules are noted with the element symbol and a subscript with the number of atoms.
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why group V III elements are called Global /inert gas
Neon, argon, krypton, xenon, helium, and radon are examples of noble gases. Due to their monatomic nature and general chemical inertness, these gases are referred to as inert gases.
Explain about the noble gases?Under typical circumstances, the noble gases are inert, tasteless, odorless, and nonflammable. In the past, they were referred to as belonging to group 0 in the periodic table since it was thought that they had a valence of zero, which meant that their atoms couldn't interact with those of other elements to form compounds.
The elements in Group 18 of the periodic table are known as noble gases, also referred to as inert gases. They are made up of radioactive radon, which lacks any known stable isotopes, as well as helium, neon, argon, krypton, and xenon. Because they hardly ever bind with less-than-stellar elements—those with open outer electron shells—this is why they are known as "noble" gases.
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Select Copper(1) oxide, Cu₂O. Note that CużO is a compound composed of different types of atoms bonded together. Place the CużO molecule on the nano-balance.
A. What is the molecular mass of Cu2O?
B. Add molecules to the larger balance until its reading matches that of the nano- balance exactly. How many molecules did you need to add?
C. Repeat the above procedure with another molecule of your choice. How many molecules did you need to add?
Copper monoxide is an ionic compound. The molar mass of copper oxide is 143 g/mol. In nanobalance, we need to add the Avogadro number of molecules.
What is Avogadro number?The number of atoms contained by one mole of every substance is called Avogadro number. It is equal to 6.02 × 10²³. Hence, one mole of every compound contains these much molecules.
Copper (I)oxide is an ionic compound formed through electrons shared form copper metal to oxygen atom.
Atomic mass of copper = 63.5 g/mol
Atomic mass of oxygen = 16 g/mol
molar mass of copper oxide = (63.5 × 2) + 16 =143 g/mol
We need to Avogadro number of molecules or one mole of the compound into nano - balance to balance it exactly. Thus, 6.02 × 10²³ molecules.
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A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain
A sample of sodium hydroxide (NaOH) has a mass of 160.0 g and molar mass of 40g/mol so the moles will be 4 moles.
A mole is defined as the mass of the substance which consists of the equal quantity of basic units.The basic units can be molecules, atoms or formula units based on the substance.
The data from the question is as follows
Mass of NaOH = 160g
molar mass of NaOH =40 g /mol
The formula for the number of moles formula is expressed as
Number of Moles = [tex]\frac{Mass of substance }{ Mass of one mole}[/tex]
no. of moles = [tex]\frac{m}{MM}[/tex]
So by putting values in the given formula we will get the answer
no. of moles =[tex]\frac{160}{40}[/tex]
no.of moles = 4mol
So moles of NaOH does this sample contain is 4 mol
Your question is incomplete most probably your full question was
A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain?
A) 4.000
B) 40.00
C) 160.0
D) 6,400
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what is true about minerals? multiple select question. they are classified as water-soluble or fat-soluble. they are structurally simple. they are inorganic. they do not contain carbon atoms.
Minerals are water soluble or fat soluble and these are inorganic naturally.
Mineral is a naturally being inorganic solid with a definite chemical composition and a liquid structure. The earth is composed of mineral rudiments, either alone or in a myriad of combinations called composites.
A mineral is composed of a single element or emulsion. Minerals are water-soluble and don't bear enzymatic digestion. They're absorbed directly into the bloodstream, although some minerals need the backing of transport proteins for immersion and transport in blood.
Minerals are inorganic, naturally being, homogenous solid, with a definite chemical composition, and ordered(crystalline) infinitesimal structures.
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a sample of an element has a mass of 34.261 grams and a volume of 3.8 cubic centimeters. to which number of significant figures should the calculated density of the sample be expressed?
To 2 significant figures should the calculated density of the sample be expressed.
Density is the amount of mass per unit of volume. The symbol most often used for density is ρ although the Latin letter D can also be used. The density of a material varies with temperature and pressure. This variation is small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance decreases its density by increasing its volume.
Density = mass / volume
ρ = m V.
Density has the SI units of kilogram per cubic meter or gram per cubic centimeter. It is a useful quantity in calculating for the mass of fluids.
A sample of an element has a mass of 34.261 grams and a volume of 3.8 cubic centimeters.
mass = 34.261 grams
Volume = 3.8 cubic centimeters
Density = 34.261 g / 3.8 cm3
= 9.0160526
= 9.0 g/ cm3 ( aprox.)
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I've posted this question 5 times
From the first equation, the mole ratio of NaOH to [tex]H_2[/tex] is 2:1.
39.3 g of NaOH = 39.3/40 = 0.98 mol
The equivalent mole of [tex]H_2[/tex] = 09.8/2 = 0.49 mol
1 mol of gas at STP = 22.4 L
0.49 mol = 0.49 x 22.4 = 10.98 L of [tex]H_2[/tex]
From the second equation, the mole ratio of [tex]SnO_2[/tex] and water is 1:2.
57.6 g of [tex]SnO_2[/tex] = 57.6/150.7 = 0.38 mol
Equivalent mole of water = 0.38 x 2 = 0.76 mol
0.76 mol of water = 0.76 x 18 = 13.68 grams of water.
For the third equation, the mole ratio of propane and oxygen for a complete combustion reaction is 1:5. This can be converted to a volume ratio.
Thus, with 0.828 L of propane, the equivalent volume of oxygen required for complete combustion would be:
0.828 x 5 = 4.14 L
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in the reaction below, δh°f is zero for ________. ni (s) + 2co (g) + 2pf3 (g) → ni(co)2(pf3)2 (l)
In the reaction below, ΔH°f is zero for Ni (s).
Ni (s) + 2CO (g) + 2PF3 (g) → Ni(CO)2(PF3)2 (l)
Nickel is a highly polishable silvery-white metal with a little golden hue. Only four elements—iron, cobalt, gadolinium, and this one—are ferromagnetic at or close to ambient temperature. The temperature at which bulk nickel ceases to be magnetic is known as the Curie temperature, which is 355 °C (671 °F).Nickel has a thermal conductivity of 90.7 W/(mK). The property known as thermal conductivity, k (or ), measured in W/m.K, is used to determine how well a solid substance conducts heat.It wasn't until Torbern Bergman synthesized pure nickel in 1775 that its elemental nature was established. When the electrostatic forces are balanced, the distance between two unbonded atoms of the same element is halved.
complete question:
In the reaction below, ΔH°f is zero for ________.
Ni (s) + 2CO (g) + 2PF3 (g) → Ni(CO)2(PF3)2 (l)
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A student wants to determine the melting point of water as part of an investigation into the strength of electrostatic forces. The student considers determining the freezing point of water instead. Is this a valid option?
a. No, it is not because the freezing point is not related to the melting point.
b. Yes, it is; but determining the freezing point is likely to be more difficult.
c. No, it is not because the freezing point is not related to electrostatic forces.
d. Yes, it is; and determining the freezing point is likely to be more accurate.
The correct statement is as follows: No, it is not because the freezing point is not related to electrostatic forces (option C).
What is electrostatic force?Electrostatic forces are attractive or repulsive forces between particles that are caused by their electric charges.
Melting point refers to the temperature at which the solid and liquid phases of a substance are in equilibrium.
According to this question, a student wants to determine the melting point of water as part of an investigation into the strength of electrostatic forces.
However, the student considers determining the freezing point of water instead. This is not valid because freezing point is not related to electrostatic force.
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A particular brand of supplement pills contains calcium that is normally distributed with a mean of 490 mg and a standard deviation of 12 mg. What is the probability that a randomly selected pill contains at least 500 mg of calcium?.
The probability that a randomly selected pill contains at least 500 mg of calcium 1 - P(X < 500) = 1 - P(Z < 0.833).
The probability that a randomly selected pill contains at least 500 mg of calcium can be found by using the CDF of the normal distribution with a mean of 490 and a standard deviation of 12, and subtracting the probability that a pill contains less than 500 mg of calcium from 1.
We can use the cumulative distribution function to find the probability of X < 500, this would be the probability that a pill contains less than 500mg of calcium.
The probability of X < 500 = P(X < 500) = P(Z < (500 - 490)/12) = P(Z < 0.833)
Where Z is a standard normal variable. This is equivalent to the area under the standard normal distribution curve to the left of Z = 0.833.
To get the probability of X >=500, we subtract the probability we just calculated, from 1, that is:
1 - P(X < 500) = 1 - P(Z < 0.833)
This will give us the probability that a randomly selected pill contains at least 500 mg of calcium.
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1 - P(X 500) = 1 - P(Z 0.833) is the probability that a randomly chosen tablet contains at least 500 mg of calcium.
Using the CDF of the normal distribution with a mean of 490 and a standard probability of 12, one can calculate the likelihood that a randomly chosen calcium pill has at least 500 mg of calcium by subtracting the likelihood that it contains less calcium from 1.
We can calculate the likelihood that X 500, or the likelihood that a pill calcium contains fewer than 500 mg of calcium, using the cumulative distribution function.
The odds of X exceeding 500 are P(X exceeding 500) = P(Z (500 - 490)/12) = P(Z 0.833)
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As the term "peroxide" is used in Chapter 10, it can refer to which structure(s)? O ROOR O ROOH 0 0 O RCOOCR OTwo of these choices. O Three of these choices.
The structure which referred to peroxide is ROOR, ROOH, RCOOOCOR.
All the three structure show peroxide because in all the structure two oxygen atom is connected with single covalent bond.
Peroxides are a class of chemical compounds with the formula R-O-O-R, where R can be any element. The peroxide group, also known as the peroxo group, is the O-O group found in peroxides. The nomenclature varies to some extent. Hydrogen peroxide, also referred to as "peroxide," is the most prevalent peroxide.
Hydrogen peroxide is an antiseptic liquid that is often used to treat cuts or other skin wounds and kill germs. It comes in a brown bottle. However, peroxide is frequently employed in non-medical contexts, such as for stain removal, cleaning, and disinfection.
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How does adding oxygen (o2) to this reaction change the equilibrium? 2so2(g) o2(g) ⇌ 2so3(g)
Explanation:
bec. oxygen entered by 6 atoms and became 6 atoms after reaction
but when we add O2 it will enter by 8 atoms and became 6 after reaction so it changes the equilibrium
What does a control group show in an experiment investigation
Control group is used to establish causality by isolating the effect of an independent variable.
What is Control group?Control group can be defined as any group used as a control in a statistical experiment, extrasensory perception a group of patients who receive either a placebo or a standard drug during an investigation of the effects of another drug on other patients.
Therefore control groups are an important aspect of true experimental designs. The presence of control groups allows researchers to confirm that study results are due to the manipulation of independent variables (IVs) rather than extraneous variables
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Using values from Appendix C , calculate the value of ∆H° for each of the following reactions:a. CaO (s) + 2HCl (g) ---> CaCl2 (s) + H2O (g)b. 4FeO (s) + O2 (g) --> 2Fe2O3 (g)c. 2CuO (s) + NO (g) --> Cu2O (s) + NO2 (g)d. 4NH3 (g) + O2 (g) --> 2N2H4 (g) + 2H2O (l)
A. ∆H° = -1238.8 kJ/mol. This reaction is endothermic, meaning that heat is absorbed in order for the reaction to occur.
What is reaction?Reaction is an action in response to a stimulus. It is an immediate response to a situation or event that occurs.
The heat of formation for CaO (s) is -635.7 kJ/mol, HCl (g) is -92.3 kJ/mol, CaCl2 (s) is -790.3 kJ/mol, and H2O (g) is -241.8 kJ/mol. To calculate the ∆H°, we need to use the equation ∆H° = Σ (ΔHf products) - Σ (ΔHf reactants). Plugging in the values, we get ∆H° = (-790.3 + -241.8) - (-635.7 + -92.3) = -1238.8 kJ/mol.
b. ∆H° = -1115.8 kJ/mol
This reaction is exothermic, meaning that heat is released when the reaction occurs. The heat of formation for FeO (s) is -824.3 kJ/mol, O2 (g) is 0 kJ/mol, and Fe2O3 (g) is -1290.1 kJ/mol. To calculate the ∆H°, we need to use the equation ∆H° = Σ (ΔHf products) - Σ (ΔHf reactants). Plugging in the values, we get ∆H° = (-1290.1) - (-824.3 + 0) = -1115.8 kJ/mol.
c. ∆H° = -250.3 kJ/mol
This reaction is endothermic, meaning that heat is absorbed in order for the reaction to occur. The heat of formation for CuO (s) is -157.4 kJ/mol, NO (g) is 90.2 kJ/mol, Cu2O (s) is -167.9 kJ/mol, and NO2 (g) is 33.3 kJ/mol. To calculate the ∆H°, we need to use the equation ∆H° = Σ (ΔHf products) - Σ (ΔHf reactants). Plugging in the values, we get ∆H° = (-167.9 + 33.3) - (-157.4 + 90.2) = -250.3 kJ/mol.
d. ∆H° = -907.2 kJ/mol
This reaction is exothermic, meaning that heat is released when the reaction occurs. The heat of formation for NH3 (g) is -45.9 kJ/mol, O2 (g) is 0 kJ/mol, N2H4 (g) is -208.6 kJ/mol, and H2O (l) is -285.8 kJ/mol. To calculate the ∆H°, we need to use the equation ∆H° = Σ (ΔHf products) - Σ (ΔHf reactants). Plugging in the values, we get ∆H° = (-208.6 + -285.8) - (-45.9 + 0) = -907.2 kJ/mol.
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5.
older, oibors
As the elements of Group 16 (VIA) are considered
from top to bottom on the Periodic Table, the
covalent radii
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A. increase and the ionization energies decrease
B.
increase and the ionization energies increase
C. decrease and the ionization energies increase
D. decrease and the ionization energies decreases
As the elements of Group 16 (VIA) are considered from top to bottom on the Periodic Table, the covalent radii decrease and the ionization energies decreases.
What is Periodic Table?
The Periodic Table of Elements is an arrangement of all known chemical elements, arranged in order of atomic number, from the lightest (hydrogen) to the heaviest (uranium). The table is organized into rows and columns, with each element having its own unique properties. Elements are arranged according to their atomic number, number of protons, and electron configuration. The table also has information about the element’s chemical symbol, atomic mass, and physical properties. The Periodic Table helps scientists understand the structure of atoms, predict their chemical reactions, and the characteristics of their compounds. It also allows scientists to compare how elements interact with each other to form new substances.
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1) Which of the following substances is not a solution? A) steel B) humid air C) oxygen D) beer E) brass
Oxygen as the substances is not a solution. It is classified as an element.
In general , solution is known as a homogeneous mixture in which two or more substances are present. Air is also considered as an example of a solution (gaseous solution) because it is a homogeneous mixture of different gases like oxygen, nitrogen, hydrogen, etc. Also Air is known as a gaseous mixture that are composed of variety of gases. Beer is a mixture of Ethanol and water.
Hence, solution is considered as an mixture which has uniformity throughout. A perfect example of solution is salt and water so also considered as a homogenous mixture. When a mixture is not uniform throughout is not considered as solution example includes sand in water.
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records of each controlled substance dispensed, received, or destroyed at the facility where you work must be available for review for what time period?
Records of each controlled substance dispensed, received, or destroyed at the facility where you work must be available for review. The time for which the records is taken care of depends on person to person.
Maintain Controlled Substance Records The licensee/registrant must maintain applicable, accurate records in a secure storage location for two (2) years from the date of last transaction. All records must be readily available for audit purposes to U-M, the State of Michigan, or DEA Diversion Investigators. we have to manage time to our fullest so that we can use it to our benefit and make good benefit to it. by which information we can particularly consider that records of each controlled substance dispensed, received, or destroyed at the facility where you work must be available for review. The time for which the records is taken care of depends on person to person.
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choose the chiral structures among the ones shown.
Since the central carbon is attached to various groups, all of the compounds in the list have chiral centres.
If a compound has at least one carbon atom with four different valencies, known as a chiral centre, it is said to be chiral.
Because the carbon atom in CFClBrI is joined to four different groups, it is chiral.
Chiral have stereoisomers and are optically active.
The second carbon with the OH group has four different groups attached to it in the chiral first compound. The first is OH, the second is H, the third is a CH3 group, and the fourth is CH(CH3)2. The carbon containing the OH group has four different valencies in the second compound, which is also chiral. The carbon atom in the third one has four different groups, making it chiral as well. As a result, every compound is chiral.
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