An acid–base titration is a method of quantitative analysis for determining the concentration of an acid or base by exactly neutralizing it with a standard solution of base or acid having known concentration. A pH indicator is used to monitor the progress of the acid–base reaction.
There is no change in the concentration of the reactants or the products.
When a reversible process reaches equilibrium,
The forward reaction rate is the same as the backward reaction rate.
The quantity of product being formed is therefore equal to the quantity of reactant being formed in a given amount of time.
Therefore, for a reversible reaction at equilibrium, both the reactant concentration and the product concentration are constant.
Indicators can be used to roughly determine the equivalence point of an acid-base titration as this colour shift only happens over a narrow pH range.
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The principle behind the acid-base titration is that at the equivalence point , is where the no. of moles of the OH⁻ and H⁺ is equals. . indicator is the dye that color depends on the acidity or the basicity of solution.
The principles in which the acid - base titration is based on is that at the equivalence point the number of the moles of the OH⁻ ions and the number of moles of the H⁺ both are equals. in the neutralization reactions the acid and the base will react and form the salt and the water.
An indicator is the dye or the chemical substances the will indicates the nature of the acidic and the basic solution.
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Based on what you know about types of reactions, create 3 testable questions that help you determine which type of reaction has occurred in your reaction scenario. For hydraulic acid and magnesium reaction.
The substances that undergo a chemical reaction are known as reactants, whilst the chemicals that are produced are known as products.
How many type of reaction are present?The 5 primary types of chemical reactions are:
Combination reactionDecomposition reactionDisplacement reactionDouble Displacement reactionPrecipitation ReactionThrough a physical transition, the shape or form of the material changes, but the type of substance it contains does not. However, when there is a chemical shift, the nature of the matter changes, and at least one new material with novel features is produced. The transition between physical and chemical states cannot be bridged in a straight line.
Writing a balanced chemical equation has the goal of explaining the resulting products and reactants (end results). The ratios in which they respond allow you to calculate how many reactants you require and how many products you can produce.
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Compare the mass of the magnesium strip from test tube 1 with the
initial mass of the same strip measured in task 1, part A. Is the mass the
same, or is it different? If it's different, explain what may have caused
the difference.
The mass of the magnesium strip from test tube 1 is different than the initial mass of the same strip measured in task 1, part A. This difference in mass is likely due to the reaction of the magnesium strip with the hydrochloric acid, which caused the magnesium to dissolve and be converted into magnesium chloride.
What is the magnesium?
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a silvery-white, light, and ductile metal. Magnesium is a vital component of many biological processes, including photosynthesis and respiration, and is essential for many enzymes, proteins, and cell membranes. Magnesium is also an important component of human nutrition, as it helps to regulate calcium and potassium levels in the body. Magnesium is found in a variety of foods, including green leafy vegetables, nuts, whole grains, and dairy products. Additionally, magnesium can also be found in many dietary supplements. Magnesium deficiency can lead to a number of health problems, including muscle cramps, fatigue, and headaches.
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12) The reaction of 50 mL of C12 gas with 50 mL of CH4 gas via the equation: C12 (g) + CH4 (g) → HCl (g) + CH3C1 (g)
will produce a total of
A) 100
mL of products if pressure and temperature are kept constant.
B) 50
C) 200
D) 150
E) 250
The reaction of 50 mL of C12 gas with 50 mL of CH4 gas via the given equation, will produce a total volume of 100 mL (Option A)
How do I determine the total volume of the products?The total volume of the products can be obtained as illustrated below:
We shall assume the pressure and temperature are kept constant.
First, we shall determine the limiting reactant. This is shown belo:
Cl₂(g) + CH₄(g) → HCl(g) + CH₃Cl(g)
From the balanced equation above,
1 mL of Cl₂ required 1 mL of CH₄
Thus,
50 mL of Cl₂ will also require 50 mL of CH₄
Thus, both reactants are limiting reactants.
Now we shall determine the volume of each products. Details below:
For HCl:
From the balanced equation above,
1 mL of Cl₂ reacted to produce 1 mL of HCl
Therefore,
50 mL of Cl₂ will also react to produce 50 mL of HCl
For CH₃Cl:
From the balanced equation above,
1 mL of Cl₂ reacted to produce 1 mL of CH₃Cl
Therefore,
50 mL of Cl₂ will also react to produce 50 mL of CH₃Cl
Finally, we shall determine the total volume of the products. Details below:
Volume of HCl = 50 mLVolume of CH₃Cl = 50 mLTotal volume =?Total volume = volume of HCl + volume of CH₃Cl
Total volume = 50 + 50
Total volume = 100 mL (Option A)
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100 cm³ of a gas at 740 mm pressure at a certain temperature is taken. What will be the volume of the same mass of gas at 780 mm pressure at the same temperature?
Answer:
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The Gaseous State
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What volume will a gas occupy at 740mm pressure which at 1480 mm occupies 500 cc? Temperaturebeingconstant.
Last updated date: 30th Dec 2022
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Hint: Boyle in the mid 1600’s observed that the product of the pressure and volume of a gas are observed to be nearly constant provided that the temperature is kept constant. This is always true in the case of an ideal gas.
P×V=constant
This relationship between pressure and volume of an ideal gas is known as the Boyle's Law.
Complete answer:
Since it is given in the question that temperature can be assumed as constant, we can apply Boyle’s Law.
According to Boyle's Law we know that:
⇒P×V=constant
We can rewrite this as
⇒P1×V1=P2×V2
Where P1 is the pressure at the volume V1
P2 is the pressure at the volume V2
Thus from the given question we can say that:
P1 = 1480 mm
V1 = 500 cc
P2 = 740 mm
V2 = x
Thus we can rewrite the equation and substitute the above values and obtain the equation given below:
⇒V2=P1×V1P2
⇒V2=1480×500740
⇒V2=1000cc
Thus the volume of gas occupied at a pressure of 740 mm is 1000 cc.
Which element is oxidized in this reaction?
Zno+C →Zn + Co
Enter the chemical symbol of the element.
View Available Hint(s)
C is oxidized.
Correct
Carbon gets oxidized in the process of reducing zinc. Zinc gets reduced in the process of oxidizing carbon.
Part B
Which substance is the oxidizing agent in this reaction?
Zno+C →Zn + Co
Express your answer as a chemical formula.
View Available Hint(s)
Part C
Which element is reduced in this reaction?
Cr₂O₇² +3HNO₂+5H+→ 2Cr³+ 3NO₃ +4H₂O
Enter the chemical symbol of the element.
View Available Hint(s)
Cr is reduced
Correct
Nitrogen gets oxidized in the process of reducing chromium. Chromium gets reduced in the process of oxidizing nitrogen.
Part D
Which substance is the reducing agent in this reaction?
Cr₂O₇² +3HNO₂+5H+→ 2Cr³+ 3NO₃ +4H₂O
Express your answer as a chemical formula.
View Available Hint(s)
The element which is oxidized in the reaction; ZnO + C → Zn + CO is carbon.
The oxidizing agent in the reaction is ZnO.
The element which is reduced in the reaction; Cr₂O₇²⁻ + 3 HNO₂ + 5H⁺ → 2Cr³⁻ + 3 NO₃ + 4 H₂O is chromium.
The reducing agent in the reaction is HNO₂.
What are oxidation and reduction reactions?Oxidation reactions are reactions in which there is a loss of electrons or in which oxygen is added to an element.
Reduction reactions are reactions in which there is a gain of electros or in which oxygen is removed from an element.
Reducing agents are substances that undergo oxidation whereas, oxidizing agents are substances that are reduced.
In the equation of reaction shown below:
ZnO + C → Zn + CO
Carbon gets oxidized in the process of reducing zinc. Zinc gets reduced in the process of oxidizing carbon.
In the equation of reaction shown below:
Cr₂O₇²⁻ + 3 HNO₂ + 5H⁺ → 2Cr³⁻ + 3 NO₃ + 4 H₂O
Nitrogen gets oxidized in the process of reducing chromium. Chromium gets reduced in the process of oxidizing nitrogen.
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How many moles of boron are in 4.80 moles of kryptonite?
The number of moles of Boron in 4.80 moles of kryptonite is 14.4 moles of Boron.
The correct option is C.
What are the moles of a substance?The moles of a substance is the amount of that substance that contains as many elementary particles as there are 12 grams of carbon-12 isotope.
The moles of an element in a compound are determined from the mole ratio of the elements in 1 mole of the compound.
Given the formula for Kryptonite, NaLiSiB₃O₇(OH).
There are 3 moles of Boron in 1 mole of Kryptonite.
In 4.8 moles of kryptonite, there will be 4.8 * 3 moles of Boron.
Moles of Boron = 14.4 moles of Boron.
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Complete question:
Jadarite, a.k.a. kryptonite, has a formula of NaLiSiB₃O₇(OH).
How many moles of boron are in 4.80 moles of kryptonite?
A. 4.80 B. 10.8 C. 14.4 D. 1.60 E. 658.4
calcium chloride dissolves in water according to the balanced equation: calculate the concentration of cl- ions in a solution if 500 ml of 1.25 m cacl2 is diluted to 600 ml with distilled water for an experiment.
After diluting 500 ml of 1.25 mol CaCl₂ solution, the concentration of Cl⁻ ions increases to 2.08 Molar.
Given
Each CaCl₂ molecule gives two chloride molecules in the solution.
The initial concentration of CaCl₂ N₁ = 2 x 1.25 M ( n- factor = 2)
The initial volume of CaCl₂ V₁ = 500 ml
The final volume of the CaCl₂ solution V₂ = 600 ml
The final concentration of CaCl2 solution N₂ =?
N₁V₁ = N₂V₂
2 x 1.25 x 500 = N2 x 600 ml
N₂ = 2.08 molar chloride ion is present in the volume of the 600 ml solution.
Hence, dilution increases the dissociation percentage of salts.
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The concentration of Cl- ions rises to 2.08 mol after 500 ml of a 1.25 mol CaCl2 solution have been diluted.
Two chloride molecules are produced in the solution by each CaCl2 molecule.
CaCl2's initial concentration was 2 × 1.25 M (n-factor: 2).
CaCl2's initial volume, V1, is 500 ml.
The CaCl2 solution's final volume, V2, is equal to 600 ml.
The final CaCl2 solution N2 concentration is equal to.
N₁V₁ = N₂V₂
N2 x 600 ml = 2 x 1.25 x 500
The 600 ml of solution contains N2 = 2.08 molar chloride ions.
Dilution thereby raises the salts' dissociation percentage. The concentration of Cl- ions rises to 2.08 mol after 500 ml of a 1.25 mol CaCl2 solution have been diluted.
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In poisoning with HCN nitrates are given with order to
a cyanide antidote if the diagnosis of cyanide toxicity is strongly suspected, without waiting for laboratory confirmation.
What is Cynaide Tocicity?Available antidotes are hydroxocobalamin (Cyanokit) and sodium thiosulfate and sodium nitrite (Nithiodote). Both are given intravenously.
Patients who present with more than minimal symptoms that resolve without treatment should be admitted for observation and supportive care.
In patients with acute poisoning from hydrogen cyanide (HCN) gas or soluble salts, the principal acute care concerns are hemodynamic instability and cerebral edema.
Therefore, a cyanide antidote if the diagnosis of cyanide toxicity is strongly suspected, without waiting for laboratory confirmation.
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What is the first quantum number of a 1 s² electron in phosphorus,
1s²2s²2p 3s²3p³?
A. n = 1
B. n = 2
C. n = 3
D. n = 0
The first quantum number, that is, the principal quantum number of a 1s² electrons is n= 1. Hence, option A is correct.
What is quantum number?Quantum numbers of an electrons represents the allocation of electrons in each orbitals within an atom. There are four different quantum numbers namely, principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.
No two electrons in an orbital will have same set of these four quantum numbers. The principal quantum number corresponds to the main energy levels represented by the letter n.
n for 1s orbital is always 1. Similarly for a 3s orbital n is 3. Therefore, the principal quantum number of one electron in 1s is n=1.
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Which of these qualities most likely helped Kepler construct the scientific explanation of the solar system?
a generosity and helpfulness
b igenuity and creativity
c assertiveness and flexibility
d consideration and compassion
0.030 mol He x22.4 L He
------------ = L He
1 Mol He
The balanced equation of the decomposition of hydrogen peroxide is as follows:
2 H₂O₂ ----> 2 H₂O + O₂0.030 mol He x 22.4 L He = 0.672 L He
What are the products of the decomposition of hydrogen peroxide?
Hydrogen peroxide is a compound of hydrogen and oxygen combined in a ratio of 1 : 1.
The products of the decomposition of hydrogen peroxide are water and oxygen gas. The equation of the decomposition of hydrogen peroxide is given below:
2 H₂O₂ ----> 2 H₂O + O₂
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Three 15.0 mL acid samples - 0.10 M HA, 0.10M HB, and 0.10 M H2C - are all titrated with 0.100 M NaOH.If HA is a weak acid, HB is a strong acid, and H2C is a diprotic acid, which statement is true of all three titrations?
All three titrations have the same final pH.
All three titrations require the same volume of NaOH to reach the first equivalence point.
All three titrations have the same pH at the first equivalence point.
All three titrations have the same initial pH.
All three titrations require the same volume of NaOH to reach the first equivalence point.
The type of acid used in the titration determines the pH of the result: a strong acid results in a pH of 7 at the titration's equivalent. Equivalence point for a weak acid is influenced by the type of conjugate base and weak acid's beginning pH. The type of the acid is another factor for a diprotic acid.
Thus:
The initial pH of all three titrations is the same, as is the pH at the first equivalence point in all three titrations. Moreover, the final pH of all three titrations is the same. of the three are FALSE.
Thus:
To reach the first equivalence point, all three titrations need the same volume of NaOH.
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If HA is the weak acid, HB is the strong acid, and H₂C is a diprotic acid, the statement is true for the titrations is All three titrations require the same volume of NaOH to reach the first equivalence point.
The pH of the titration is depend on the nature of acid. here the the HA is the weak acid and the HB is the strong acid. the H₂C is the diprotic acid. the diprotic acid means the acid which contains the two hydrogen atoms and will ionized in the water.
Thus, the from all the statements the true one is that All three titrations require the same volume of NaOH to reach the first equivalence point.
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S + 6 HNO3 H₂SO4 + 6 NO₂ + 2 H₂O
HNO3 to H2O has a stoichiometric ratio of 6:2.
To calculate the moles of HNO3, use 9 grams.
HNO3:H2O 6:2 9 grams/63 grams/mol = 0.143 moles.
0.048 moles of H2O are equal to 0.143*2/6.
water mass =0.048moles*18g/mol=0.864g
0.9 grams, to the closest tenth.
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Correct Question: How many moles of HNO3 required to react completely with 9grams of sulfuric acid?
How many atoms of potassium make up 1.525 moles of potassium?
Answer:
To find the number of atoms in 1.525 moles of potassium, you can use the formula:
Number of atoms = Number of moles * Avogadro's number
Avogadro's number is a constant that is equal to 6.022 x 10^23 atoms/mole. Plugging in the values for the number of moles and Avogadro's number, you get:
Number of atoms = 1.525 moles * (6.022 x 10^23 atoms/mole)
= 9.149 x 10^23 atoms
Therefore, there are approximately 9.149 x 10^23 atoms of potassium in 1.525 moles of potassium.
According to Avogadro's number there are 9.18×10²³ atoms of potassium which make up 1.525 moles of potassium.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
In the given question number of atoms =number of moles×Avogadro's number=1.525×6.023×10²³=9.18×10²³ atoms .
Thus ,there are 9.18×10²³ atoms of potassium which make up 1.525 moles of potassium.
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Please help!
Suppose you need to perform single molecule detection. You have a CCD that can give detectable signal with 10000 electrons in a well if all 532 wells in the column of the CCD array are summed. Assuming you have F2 optics for collection, throughput to the CCD is 70%, the quantum efficiency of the CCD is 0.90 for the wavelengths you are looking at (detector have their own quantum efficiencies), the dye molecule you are detecting has a quantum efficiency of 0.80 and fluorescence lifetime of 25 ns, how long would you need to collect data in order to obtain a signal that is detectable? Assume the laser you are using gives you amble photons for the experiment.
If you have a 25 micron spot size, what concentration of molecule do you need in solution to ensure you will see a single molecule in ~ 5 percent of your experiments?
Throughput to the CCD is how much light you get to the CCD after reflection and other loses due to optical components.
A charge-coupled device (CCD) is a component that receives an electrical charge and transmits it to the following area.
What is single molecule technique?A charge-coupled device (CCD) is a component that receives an electrical charge and transmits it to the following area.An electrical charge can be received and transferred via a charge-coupled device (CCD) to another area where it can be altered, such as transforming it to an electronic value.High-powered telescopes and CCD device image sensor cameras can be utilized in astronomy.Once the Earth's rotation synchronizes with the telescope, the imaging system can focus for a number of hours on a single location in space.To learn more about CCD refer
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Please help.The question is in the picture.
The words that fill in the spaces in order are;
a) wavelength
b) crest
c) amplitude
d) trough
What is the wave?Let us now remind ourselves that what we call a wave just have to do with a disturbance that is moving in a medium and has the abilities transfer energy in the medium in which the material is moving. We know that the distance that has been covered by the wave in the horizontal direction is what we can still be able to call the wavelength of the wave.
If we have a sketch of the wave motion, we know that the distance that is found between two successive crests or troughs is what we call the wavelength of the wave and the crests are the top positions while the troughs has to do with the downward positions. The amplitude is the maximum disturbance of the wave.
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A salt shaker contains 8.75 x 1022 formula units of sodium chloride. How many moles is this?
Answer:
[tex]\huge\boxed{\sf No.\ of\ moles = 0.145\ moles}[/tex]
Explanation:
Given data:No. of particles = 8.75 × 10²² units
Avogadro's number = 6.022 × 10²³
Required:No. of moles = ?
Formula:Number of moles = No. of particles / Avogadro's number
Solution:No. of moles = 8.75 × 10²²/6.022 × 10²³
No. of moles = 1.45 × 10⁻¹
No. of moles = 0.145 moles[tex]\rule[225]{225}{2}[/tex]
Copper metal can be produced commercially through a single replacement reaction of aluminum metal and copper (II) chloride. How many grams of aluminum are required to react with 10.05 moles of copper (II) chloride?
Answer:180.9g
Explanation:
Balance Chemical Reaction can be written as:
2Al + 3CuCl2→2AlCl3+Cu
2 mol aluminium reacts with 3mol copper chloride
therefore,
10.05moles copper chloride require=2*10.05/3 mol aluminium
=6.7mol aluminium
now, we know that 1 mol aluminium contains 27g mass
, therefore,6.7mol aluminium=6.7*27=180.9g aluminium
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For the reaction C + 2H₂ → CH4, how many moles of carbon are needed to make 129 grams of methane, CH4 ?
0.35 moles of carbon are needed to make 129 grams of methane, CH₄.
What is methane?
Methane is a hydrocarbon gas composed of one carbon atom and four hydrogen atoms. It is the simplest and most abundant form of organic matter found in the environment. It is an odorless and colorless gas, but is often found mixed with other gases that give it a slight smell. Methane is produced naturally by the decomposition of organic matter in the absence of oxygen, such as in wetlands or the intestines of animals. It is also produced by anaerobic bacteria, which break down organic material in the absence of oxygen. It is a major component of natural gas, which is used as a fuel source for cooking and heating. Methane is also a greenhouse gas, meaning it traps heat in the atmosphere and contributes to global warming.
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the decomposition of KCIO3 occurs as follows 2KCIO3-2KCI+3O2 how many moles of oxygen are formed if 141 g of KCIO3 decompose?
141 g of KCIO3 break down into 1.725 moles of oxygen.
What does one mole equal?A substance's mole is equivalent to 6.022 x 10²³ of that material (such as atoms, molecules, or ions). The term "Avogadro's number" or "Avogadro's constant" refers to the number 6.022×10²³.
From equation 2KCIO3 ⇒ 2KCI + 3O2
(141 gm) ( x gm)
⇒ x gm of O2 =141 g KClO3 × (1 mol KClO30)/122.5 g KClO3 × (3 mol O2)/2 mol KClO3 × (32g O2)/1 mol O2
⇒13,536/245 = 55.2 g O2
now, Number of moles of O2 = Mass of O2 / Molar mass of O2
⇒No. of moles of O2 = 55.2/32 = 1.725
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Rutherford's gold foil experiment correctly advanced atomic theory by______________________________________________________.
Rutherford's gold foil experiment correctly advanced atomic theory by showing that the atom is an empty space with a dense positive nucleus.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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was added mixtus 31-6g of Potassium pitrate solid was 120 am ³ of water in a plastic beaker. The was stirred gently and the following results. Inital temperature =21-5°C Final temperature =17-0°C a) Calculate the enthalpy change for the reaction. (Density = Iglam³, C² = 4.2jg-1k-1
According to the problem the enthalpy change for the reaction is 742 J.
What is enthalpy?Enthalpy is a thermodynamic quantity that measures the total heat content of a system. It is the sum of the internal energy of the system plus the product of its pressure and volume. In simple terms, it is the total amount of energy contained in a system, including the energy of its components and any energy exchanged with the environment.
The enthalpy change (ΔH) for the reaction can be calculated using the equation:
ΔH = (mass of solution x C² x ΔT) / (density of solution)
Where:
mass of solution = 31.6 g
C² = 4.2 J g-1K-1
ΔT = (21.5 – 17.0) °C = 4.5 °C
density of solution = 1.00 g/cm³
Therefore, ΔH = (31.6 g x 4.2 J g-1K-1 x 4.5 °C) / (1.00 g/cm³)
= 742 J
The enthalpy change for the reaction is 742 J.
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What makes a nucleus unstable?
A. There are too few quarks to make the protons and neutrons.
B. The force of gravity on the mass in the nucleus makes it unstable.
C. The strong nuclear force doesn't balance the electrostatic force.
D. The attraction between protons and electrons pulls the nucleus
apart.
SUBMIT
Answer: the attraction between the protons and neutrons pulls the nucleus apart
Explanation: but also it is because of the fact that protons repel each other, and even though the neutrons hold the protons together in the nucleus, it has been theorized that eventually you will reach "critical mass" where you cannot make a nucleus any bigger, no matter how many neutrons you add.
Which of the following represents the overall chemical equation for the reaction and the rate law for elementary step 2
O The overall reaction is H2(g) + 2ICI(g) -- > 2HCI(g) + I2(g) The rate law for step 2 is rate = k[HI][ICI]
O The overall reaction is H2(g) + 2ICI(g) -- > 2HCI(g) + I2(g) The rate law for step 2 is rate = k [H2] [HI] [ICI]
O The overall reaction is H2(g) + 2ICI(g) -- > 2HCI(g) + I2(g) The rate law for step 2 is rate = k [H2] [ICI]
The correct answer is Option 2: The overall reaction is>
H2(g) + 2ICI(g) -- > 2HCI(g) + I2(g)The reaction of hydrogen and iodine chloride produces hydrogen iodide as an intermediate. This means that the rate of the reaction is determined by the concentrations of all three species:
hydrogenhydrogen iodideiodine chloride.The rate law, which expresses the relationship between the rate of the reaction and the concentration of the reactants, is rate = k [H2] [HI] [ICI], where k is the rate constant. This means that the rate of the reaction is proportional to the concentrations of H2, HI, and ICI.
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put new elements in top and bottom and new thrmostats in top and bottom, but only have less than luke warmwater,
Most electric water heaters feature two thermostats: an upper thermostat and a lower thermostat, which are both hidden beneath two control panels.
You should set both thermostats to the same temperature in order to ensure that your electric water heater operates as effectively as possible. At any given time, only one element will be active. An example of a flip/flop system is this. There will always be 120 volts to both elements on a 240 volt water heater. The 240 volts needed to energize the element will be completed by the thermostat by sending the second leg of the 120 volts to the element. Where the burner typically situated at the bottom of the tank, sediment can accumulate over time.
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How many molecules of SF6 are in 81 moles
Answer:
= 4.9 x 10^25 molecules of SF6
Explanation:
There's a guy named Avogadro something who said 1 mole of anything has 6.022x10^23 units (such as molecules, ions etc.) of that thing.
So to get to molecules just multiply 81 moles by 6.022x10^23
= 4.9 x 10^25 molecules of SF6
PLEASE HELP
Review the statements below and select the one that best describes the impacts that building dams can have on wildlife and the environment.
A) When a dam is built on a river, it alters the habitat and environment by rerouting the flow of water so that people and wildlife can make better use of the environment without significantly affecting ecosystems.
B) When a dam is built on a river, it alters the habitat and environment by displacing humans and animals from their homes. Fish and other wildlife can no longer move along the length of the river because the dam acts as a barrier.
C) When a dam is built on a river, it increases the available water, allowing people to irrigate crops and raise livestock, and it allows the inhabitants of the river to move freely along the length of the river.
D) When a dam is built on a river, it increases the available water for fish and other wildlife, thereby having only positive effects on wildlife and the environment.
The statement which best describes the impacts that building dams can have on wildlife and the environment include the following: C) When a dam is built on a river, it increases the available water, allowing people to irrigate crops and raise livestock, and it allows the inhabitants of the river to move freely along the length of the river.
What is a river?A river can be defined as a large natural body of fresh water that continuously flow into an ocean, lake, sea or another river. Additionally, some examples of a river include the following:
MississippiDanubeAmazonSaint LawrenceRiver NileGenerally speaking, a dam can be built on a river in order to increase the availability of water, which then allows people to irrigate their crops and raise livestock, without affecting the free movement of the living organisms living in the river.
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Study the reaction equation.
2Mg + O2 → 2MgO
If magnesium (Mg) ions carry a 2+ charge, how are the electrons
transferred in this reaction?
Each Mg atom gives two electrons to an O atom.
Each Mg atom gives one electron to an O atom.
Each O atom gives two electrons to an Mg atom.
Each O atom gives one electron to an Mg atom.
According to the electronic configuration, as magnesium ions carry a 2+ charge, each Mg atom gives one electron to an O atom.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Calculate the approximate [OH-] in a solution that is 0.200 M in NaF. Ka for HF is 6.7 x 10^-4.
O 1.5 x 10-11 M
12 x 10^-2 M
Correct!
1.7 x 10^-6 M
C3.0 x 10^-12 M
1.3 x 10^-4 M
The [OH-] in a solution that is 0.200 M in NaF. Ka for HF is 6.7 x 10^-4 is 1.73 x 10⁻⁶M . Therefore, option C is correct.
What is the solution ?Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.
A particular kind of homogenous mixture made up of two or more substances is known as a solution. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture.
Given that,
0.200M NaF → 0.200M Na⁺(aq) + 0.200M F⁻(aq)
Na⁺ + H₂O → no reaction because sodium ion will not hydrolyze to form weak electrolyte
F⁻ + H₂O → HF + OH⁻ ( F⁻ hydrolyzes in water to form weak acid HF )
Now, Analysis:
F⁻ + H₂O → HF + OH⁻
C ( i ): 0.200M ------- 0.00M 0.00M
ΔC : -x ------- +x +x
C ( eq ) : 0.200-x ------- x x
~0.200M
Kb = Kw/Ka(HF) = [HF][OH⁻]/[F⁻]
= x²/ ( 0.200 )
= 1x10⁻¹⁴/6.7x10⁻⁴
x = [HF] = [OH⁻]
= √(0.200)(1x10⁻¹⁴)/(6.7x10⁻⁴)
= 1.73 x 10⁻⁶M in OH⁻ ions.
Thus, option C is correct.
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(c) What is the volume of 4 kg of water in liters?
Answer:
[tex]\huge\boxed{\sf v = 0.004\ m\³}[/tex]
Explanation:
Given Data:Mass = m = 4 kg
Density of water = 1000 kg/m³ (Standard)
Required:Volume = v = ?
Formula:Density = m/v
Solution:1000 = 4 / v
Multiply v to both sides1000 × v = 4
Divide both sides by 1000v = 4/1000
v = 0.004 m³
[tex]\rule[225]{225}{2}[/tex]
