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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What would stars be like if carbon had the smallest mass per nuclear particle?
(a) Supernovae would be more common.
(b) Supernovae would never occur.
(c) High-mass stars would be hotter.
(c) High-mass stars would be hotter.It shrinks and heats up.
How would stars look if they were carbon?As no more fusion events would be feasible once carbon was formed, the principal effect on stars will be that they will live much shorter lives.
Why do high mass stars have the ability to fuse carbon whereas low mass stars do not?Because the core temperature of a low-mass star never rises high enough to allow for the fusion of heavier elements, fusion cannot proceed .
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Consider this reaction: h2s + hno3 right arrow. S + no + h2o reduction half-reaction: n+5 + 3e- right arrow. N+2 oxidation half-reaction: s-2 right arrow. S + 2e- after balancing the chemical equation, what are the coefficients for these compounds? h2s hno3.
Coefficient of H2S= 3,Coefficient of HNo3 = 2are the coefficients for these compounds
Overall reaction
H_{2}*S + HN*O_{3} -> S + NO + H_{2}*O
Reduction half-reaction:
N ^ 5 +3e^ - N^ +2 ...(1)
Oxidation half-reaction:
S ^ l - 2 S+2e^ - ...(2)
2x(1) + 3x(2)
2N^ +5 +6e^ - +3S^ l -2 2N ^ 2 + 3S +6e^ -
2N^ +5 +3S^ [ - 2 -> 2N ^ 2 + 3S
3H2S+2H NO33S+2NO+ 4H2O
Coefficient of H2S= 3,Coefficient of HNo3 = 2
Components of a heterogeneous mixture have proportions that differ across the sample as a whole. In a heterogeneous mixture, the constituent parts may be seen and are not uniformly distributed. Any mixture with an uneven composition is referred to as a heterogeneous mixture.
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Answer:
3 and 2
Explanation:
Which of the three substances has the greatest permeability? a. gravel b. sand c. silt d. all are equal please select the best answer from the choices provided a b c d
The correct option is C ) gravel has the highest permeability among the options.
The ability of rock or soil to retain water is determined by its porosity or permeability. It provides information on the gaps between the grains. Sand and silt are smaller than gravel. Because of the way the grains are arranged, the integral spaces between the grains are much larger, making the material more porous. The most porous material is clay, but since that isn't an option, gravel comes in second. Sand and gravel typically have similar porosities. Typically, clay acts as an aquitard, preventing water from flowing freely. Sand and gravel are suitable aquifer materials because they are both porous and permeable. The highest permeability is found in gravel.
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The right answer is C, as gravel has the highest permeability of all the possible answers.
The porosity or permeability of rock or soil determines how much water it can hold onto. It reveals details about the spaces between the grains. Smaller than gravel are sand and silt. The integral gaps between the grains are substantially greater as a result of the arrangement of the grains, increasing the material's permeability. Gravel is second most porous substance after clay, which isn't a choice. The porosities of sand and gravel are often comparable. Typically, clay functions as an aquitard, obstructing the free passage of water.
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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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A star’s mass is determined ________ , the giant cloud of gas and dust in which it is born.
A star's mass is determined by the amount of available matter in its nebula, the giant cloud of gas and dust in which it is born.
How are stars born out of nebula?The giant cloud of dust and gas in space from which stars materialize is called a nebula. The amount of matter inside a nebula ultimately determines the star's mass. Due to gravitational pull, the hydrogen gas inside the nebula gets drawn together and collapses into a nuclear fusion reaction. This reaction keeps a star going on with its lifecycle. A star with a larger mass will have a shorter lifespan when compared to a star with a smaller mass.
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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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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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Which of the following has the lowest boiling point? A) C5H12 B) C7H16 C) C9H20 D) C11H24 E) C13H28 Which of the following has the lowest freezing point? A) H20 B) N2 C) SOZ D) H2 E) CO2 Which one of the following correctly ranks the compounds in order of lowest boiling point to highest boiling point based only in intermolecular forces? A) CH3CH2OH
Answer: C5H12
Explanation: The boiling point is the temperature at which the substance will change from the liquid to the phase gas, so compounds with weaker intermolecular forces will have lower boiling points. Since all of these options are nonpolar, they’re only intermolecular forces are dispersion forces, which are smaller for compounds with fewer electrons. Of these options, C5 H 12 has the fewest electrons, so it has the weakest intermolecular forces, and therefore the lowest boiling point.
The only intermolecular forces existing between oxygen molecules (O2) are:
London dispersion
dipole-dipole
hydrogen bonding
ion-dipole
The only intermolecular forces existing between oxygen molecules (O2) are: dipole-dipole and London dispersion.
The only intermolecular force existing between oxygen molecules (O2) is dipole-dipole interaction. Oxygen is a molecule composed of two oxygen atoms, both of which have a slight negative charge. This results in a polar molecule, with a slight negative charge on one end and a slight positive charge on the other. The dipole-dipole interaction is the attractive force between the slight positive end of one O2 molecule and the slight negative end of another O2 molecule.
It is important to note that London dispersion forces also exist between all types of molecules including O2, but they are weaker than dipole-dipole forces and are not specific to a certain type of molecule. London dispersion forces occur between all types of atoms and molecules, and are due to the temporary fluctuations of electron density within a molecule.
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Answer:London dispersion
Explanation:
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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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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how many moles of Barium Phosphate Ba2(PO4)2 are needed to have 18.02 gram of oxygen atom ?
Select the oxidizing or reducing agent(s) that you would use to carry out the transformation below. 0 OH H3C OHCH 0H H3C 0 i. O3, CH3OH ii. (CH3)2S PCC Na, NH3 RCO3H NaBH4 i. LiAlH4; ii. H30 H2, Pd H2, Lindlar's Catalyst i. KMnO4, H20, KOH, heat; ii. H30*
H2SO4/Heat, NaOH/Heat, and KOH/Heat are oxidizing agents that can be used to carry out the transformation of (OCH3)CH2CH2COOCH3 to (CH3OH)CH2CH2OH + CH3COOH.
The transformation you've provided is the cleavage of an ester (OCH3CH2CH2COOCH3) to an alcohol (CH3OHCH2CH2OH) and a carboxylic acid (CH3COOH).
There are several oxidizing agents that can be used to carry out this transformation, such as:
H2SO4/Heat, which can cleave esters by forming a carboxylic acid and an alcohol.
Sodium Hydroxide (NaOH) and Heat, which can also cleave esters by forming a carboxylic acid and an alcohol.
Potassium hydroxide (KOH) and Heat, which can also cleave esters by forming a carboxylic acid and an alcohol.
It's worth noting that these oxidizing agents are not selective and could also oxidize other functional groups in the molecule, so if a selective oxidation is needed, other methods like using enzymes or specific oxidizing agents should be considered.
--The question is incomplete, complete question is given below--
"Select the oxidizing or reducing agent(s) that you would use to carry out the transformation (OCH3)CH2CH2COOCH3 to (CH3OH)CH2CH2OH + CH30H
i. O3, CH3OH ii. (CH3)2S
PCC
Na, NH3
RCO3H, NaBH4
i. LiAlH4; ii. H30+
H2, Pd
H2, Lindlar's Catalyst
i. KMnO4, H20, KOH, heat; ii. H30+"
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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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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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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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Calculate the moles present in 2.00 grams of H2O
Answer:
0,1 moles
Explanation:
moles (n) = mass : Mr
n = 2 grams : (2 × H + 1 × O)
n = 2 grams : (2 + 16)
n = 2 grams : 18 grams/moles
n = 1 : 9 moles
n = 0,1 moles
Draw the Lewis structure of acetic acid, CH3CO2H, including all non-bonding lone pairs. Leave this question blank on your Scantron
Acetic acid (CH3COOH) has 7 bonds total, with the oxygen-carbon link being the only one.
In the Lewis structure of acetic acid, how many lone pairs are there?There are four lone electron pairs in all (2 on each oxygen atom).Acetic acid (CH3COOH) has 7 bonds total, with the oxygen-carbon link being the only one.Since an organic acid containing a -COOH group, such as acetic acid, has a chemical formula that must have this group in order for the chemical formula to accurately reflect the chemical nature of the compound. In light of this, CHCOOH is the proper formula for acetic acid.Since an organic acid containing a -COOH group, such as acetic acid, has a chemical formula that must have this group in order for the chemical formula to accurately reflect the chemical nature of the compound.To learn more about Acetic acid refer to:
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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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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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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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What are the top 3 causes of climate change explain?
Approximately one-fourth of all greenhouse gas emissions worldwide are caused by deforestation, along with agriculture and other changes in climate.
The removal of a forest or tree stand from land and subsequent conversion of that area to a non-forest usage is known as deforestation or forest clearance.Short-term climatic changes also include those brought on by the ocean and atmosphere interacting. Seasons. Because the amount of solar energy received by Earth at various latitudes varies throughout the year, seasons develop. Climates all throughout the world are impacted by these changes in wind, current, and ocean temperature. Changes often last a year or two, while climate refers to the area's typical long-term weather patterns. The average weather for a specific area and time period, often averaged over a 30-year period, is how some scientists describe climate. Sea surface temperatures will rise. More heat energy will emerge from this, increasing the likelihood that tropical cyclones may form.
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The three main factors are greenhouse gases, Natural variations in CO2 concentrations and deforestation and vegetation loss affecting rainfall patterns.
In the last 650,000 years, there have been seven phases of glacial advancement and retreat, continuing a long history of climate change.
Since the Industrial Revolution, human activity has led to an increase in the concentrations of all the major greenhouse gases. The earth's surface temperature has grown as a result of such greenhouse gas emissions and the greenhouse effect. More than any other human activity, the burning of fossil fuels alters the climate.
The patterns of rainfall are impacted by deforestation and the removal of vegetation. Deforestation raises temperatures and alters the amount and distribution of rainfall, often leading to a drier environment. These effects may have an impact on soil moisture, lowering yields in certain regions and causing more flooding in others.
Naturally, as a result of variations in CO2 concentrations, the amount of carbon dioxide in the atmosphere is increasing by roughly 2.40 ppm annually.
Over the past million years, periodic rises in carbon dioxide levels have naturally raised Earth's temperature throughout ice age cycles.
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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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Calculate the molar mass in a 1.52kg sample of glucose
The molar mass is independent of mass of substance and hence molar mass in a 1.52 kg of glucose is 180 g.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Chemical formula of glucose is C₆H₁₂O₆ and hence molar mass is 12×6 +1×12+16×6=180 g.
Hence, molar mass in a 1.52 kg of glucose is 180 g.
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the formation of carbonic acid from water and carbon dioxide is catalyzed by _______.
Water and carbon dioxide combine to induce carbonic acid, which is catalyzed by carbonic anhydrase.
A family of enzymes known as carbonic anhydrases catalysis the interconversion of carbon dioxide and water with carbonic acid's separated ions. utmost carbonic anhydrases have a zinc ion in their active point. As a result, they're categorised as metalloenzymes.
Because carbonic acid is the sole acid that's exhaled by mortal lungs in a gassy state, it's constantly appertained to as a respiratory acid. It's a weak acid that produces bicarbonate and carbonate mariners.
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1_ ∆E is negative for
a. an endothermic reaction.
b. an exothermic reaction.
c. an inhibited reaction.
d. a stable reaction.
2_ The minimum energy required for an effective collision is called
a. energy of enthalpy.
b. activation energy.
c. free energy.
d. kinetic energy.
Answer:1.b
2. b
Explanation:
1. Since, energy is released during an exothermic reaction the value of delta E will be negative.
2. Effective collisions are those that result in a chemical reaction. In order to produce an effective collision, reactant particles must possess some minimum amount of energy. This energy, used to initiate the reaction, is called activation energy.
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Answer:
1. An exothermic reaction
2. Activation energy
Explanation:
1. When ∆E is negative, it means that energy left the "system." The system is the reaction. The change in energy tells us how much energy was involved, and the sign tells us wheter it enetered (endothermic) or left (exothermic) the system. The fun reactions are generally exothermic - they release energy. The energy in 1 gram of rocket fuel is high. The energy left after ignition is low, for the products of the reaction. The energy did not disappear. It was converted to different forms of energy: heat, pressure, light, and noise.
2. For two atoms or molecules to react, they must come in close contact for the reaction to begin. These contacts occur when they collide at an ambient temperature that provides sufficient momentum for the two entities to overcome any repulsive forces and, instead, find the correct positons that allow close contact and the formation of new bonds. This is called the activation energy. Mixing oxygen and hydrogen will not produce an explosion without some form of activation energy applied to the system. It doesn't take much for an O2/H2 reaction, but other reactions may require an appreciable amount to start the reaction..
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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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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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
Which type of bond would be present in the compound SeS?
O lonic
O Polar covalent
O James
O Non-polar covalent
