Answer:
pH = 2.88
Explanation:
For a weak acid solution, the pH can be calculated using the following formulas:
[H⁺] = [tex]\sqrt{Ka*C}[/tex]pH = -log[H⁺]Where Ka = [tex]10^{-pKa}[/tex] and C is the molar concentration.
We are given Ka and C by the problem, meaning we can now proceed to calculate [H⁺]:
[H⁺] = [tex]\sqrt{1.7*10^{-4}*0.01}[/tex] [H⁺] = 0.0013 MFinally we calculate the pH:
pH = - log (0.0013) = 2.88A ruler has markings as shown below. Stefan uses this ruler to measure the length of a metal rod. How many decimal places should his answer include? A.1 B.2 C.3 D.4
Answer:
A
Explanation:
Based on a ruler in centimeters, with ten divisions between each centimer mark, you will have marks at every 0.1 cm.
Then, the measure of the length of a metal rod should have 1 decimal place.
That decimal place means limiters, given that 1 mm = 0.1 cm.
Answer:
A
Explanation:
Based on a ruler in centimeters, with ten divisions between each centimer mark, you will have marks at every 0.1 cm.
Then, the measure of the length of a metal rod should have 1 decimal place.
That decimal place means limiters, given that 1 mm = 0.1 cm.
Giant planet atmospheres have layers of clouds and aerosols (tiny liquid droplets) made from different chemicals because:
A) convection does not occur on giant planets.
B) the Coriolis effect affects each chemical compound differently.
C) different chemicals condense at different temperatures.
D) the winds are in the outermost layer.
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Thus option C is correct option.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
Giant planet atmospheres have layers of clouds and aerosols (tiny liquid droplets) made from different chemicals because different chemicals condense at different temperatures.
Therefore, option C is correct option.
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Calculate the standard cell potential for each reaction below, and note whether the reaction is spontaneous under standard state conditions.
(a) Mg(s) + Ni2+(aq)⟶ Mg2+(aq) + Ni(s)
(b) 2Ag+(aq) + Cu(s)⟶ Cu2+(aq) + 2Ag(s)
(c) Mn(s) + Sn(NO3)2(aq)⟶ Mn(NO3)2(aq) + Sn(s)
(d) 3Fe(NO3)2(aq) + Au(NO3)3(aq)⟶ 3Fe(NO3)3(aq) + Au(s)
The standard cell potential (also known as the standard electrode potential) is a measure of the potential difference between two electrodes in an electrochemical cell under standard state conditions.
(a) Standard Cell Potential for Mg(s) + Ni2+(aq)⟶ Mg2+(aq) + Ni(s):
E0cell = (0.79 - (-0.25))V = 1.04 V.
This reaction is spontaneous under standard state conditions.
(b) Standard Cell Potential for 2Ag+(aq) + Cu(s)⟶ Cu2+(aq) + 2Ag(s):
E0cell = (0.34 - (-0.52))V = 0.86 V.
This reaction is spontaneous under standard state conditions.
(c) Standard Cell Potential for Mn(s) + Sn(NO3)2(aq)⟶ Mn(NO3)2(aq) + Sn(s):
E0cell = (0.15 - (-0.14))V = 0.29 V.
This reaction is spontaneous under standard state conditions.
(d) Standard Cell Potential for 3Fe(NO3)2(aq) + Au(NO3)3(aq)⟶ 3Fe(NO3)3(aq) + Au(s):
E0cell = (1.23 - (-1.50))V = 2.73 V.
This reaction is spontaneous under standard state conditions.
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Classify each of the following as a Strong acid (sa) or a Weak acid (wa) and indicate how each should be written in aqueous solution. Classify In solution this acid should be written as: 1. nitrous acid H 2. hydrochloric acid 3. perchloric acid Classify each of the following as a Strong acid (sa) or a Weak acid (wa) and indicate how each should be written in aqueous solution. Classify In solution this acid should be written as: 1. phosphoric acid 2. sulfurous acid 3. carbonic acid
Nitrous acid, phosphoric acid, sulfurous acid and carbonic acid are the weak acids. Hydrochloric acid and perchloric acid is a strong acid. This can be Written in the aqueous solution.
Nitrous acid is a weak acid and can be written in the aqueous solution as,
HNO2 (aq.) ----> H+ (aq.) + NO2- (aq.)
This is very unstable and exists only in aqueous solution.
Hydrochloric acid is a strong acid and can be written in the aqueous solution as,
HCl(aq.) ------> H+ (aq.) + Cl -(aq.)
perchloric acid is a strong acid and can be written as
HClO4 (aq.) ----> H+ (aq.) + ClO4- (aq.)
Phosphoric acid is a weak acid. It is a triprotic acid that exists as a dense liquid. It is an irritant or corrosive to the skin, eyes. It can be written in the aqueous solution as,
H3PO4 (aq.) ----> H+ (aq.) + H2PO4- (aq.)
sulfurous acid is a weak acid and can be written as,
H2SO3 (aq.) ----> H+ (aq.) + HSO3- (aq.)
carbonic acid is a weak acid. Carbonic acid is a carbon-containing compound which has the chemical formula H2CO3. This can be written in the aqueous solution as,
H2CO3 (aq.) ----> H+ (aq.) + HCO3- (aq.)
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a sample of carbon dioxide gas at 311 k and 0.956 atm occupies a volume of 1.12 l. if the pressure of the gas is decreased, while at the same time it is heated to a higher temperature, the final gas volume
The final volume will be larger than 1.12L.
What is ideal gas equation?
The Ideal Gas Law is an equation of state for a gas and is also known as the equation of state of an ideal gas. It states that the product of the pressure, volume, and temperature of an ideal gas is a constant. Mathematically, the Ideal Gas Law can be written as PV = nRT, where P is pressure, V is volume, n is the number of moles of the gas, R is the ideal gas constant, and T is temperature. The constant R is equal to the gas constant, 8.314 J/mol-K, divided by the molar mass of the gas. The Ideal Gas Law is an approximation of the behavior of many gases under many different conditions. It is useful because it relates the variables of pressure, volume, and temperature in a simple mathematical relationship.
PV=nRT
Using ideal gas equation
V2= P1V1/T1 ×T2/P2
In this equation P2 is in denominator so when pressure is decreased V2 increases.
T2 is in numerator so when temperature increases V2 increases.
Overall V2 increases.
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The final gas volume will increase
Define the ideal gas law.
The ideal gas law, also known as the perfect gas law, is a relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures where the gas's molecules move virtually independently of one another.
The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. An ideal gas is one in which the particles are both non-repellent and non-attractive to one another (have no volume).
PV = nRT
P1V1/T1 = P2V2/T2
From tis .pressure is directly proportional to volume
So if pressure is decreased, volume also decreases
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a gas is collected over water at a certain temperature. the total pressure is 760 torr. the vapor pressure of water at this temperature is 17 torr. the partial pressure of the gas collected is
A gas is collected over water at a certain temperature, then the partial pressure of gas is calculated to be = 741 torr
How is vapor pressure related to partial pressure?The term "water vapor pressure" refers to the amount of water vapor present in any gas combination that is in equilibrium with either solid or liquid water. When the vapor pressure equals the atmospheric pressure, water begins to boil.
Given total pressure is 760 torr
Vapor pressure of water = 17 torr
As we know that, partial pressure of gas = total pressure - vapor pressure of water
= 760 - 17
Partial pressure of gas = 741 torr.
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which of the following is true of bond enthalpy? group of answer choices always positive always negative sometimes positive, sometimes negative always zero
A stronger bond is always created when the bond's enthalpy is higher since a stronger bond requires more energy to break.
Whoa, what do you mean, bond?Bonds are financial instruments in which a buyer loans money for a certain duration to a business or the government in return for periodical interest payments.
Chemistry: How do bonds function?Between atoms or ions, a condensation reaction is a source of attraction. Atoms share or transmit their valence electrons, which results in bonds. The electrons that can be engaged in chemical reactions are known as valence electrons, which are located at the outermost energy level of the atom.
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for which one of the following is the enthalpy of the reaction the same as the enthalpy of formation? h2(g)
The equation in which the enthalpy of formation is the same as the enthalpy of reaction is option A.
What is the enthalpy?The term enthalpy has to do with the heat that is giving out or is absorbed in a reaction. We know that the enthalpy of formation would refer strictly to the heat that is given out or absorbed when a substances is formed from its constituents under standard conditions.
We know that when we are looking at the enthalpy of formation of a substance, we are looking at the way that the elements that make up the substance are able to combine and these elements that are becoming combined in the substance would have to do that under standard conditions so as to generate the equation of the enthalpy of formation of the substance.
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Which of the following would NOT be considered valid sources of error in a laboratory experiment? I: Calculation errors II: Inability to calibrate measuring devices III: Using the wrong solution for a reaction
O III only O II only O I only O both I & II O both I & III
The answer is O II only.
I: Calculation errors would be considered a valid source of error in a laboratory experiment. If the calculations made during the experiment are incorrect, it can affect the accuracy of the results.
II: Inability to calibrate measuring devices would NOT be considered a valid source of error in a laboratory experiment. Calibrating measuring devices is an essential step in any experiment to ensure that the measurements being taken are accurate. If the measuring devices are not calibrated correctly, the results of the experiment will be invalid.
III: Using the wrong solution for a reaction would be considered a valid source of error in a laboratory experiment. If the wrong solution is used, the results of the experiment may not be accurate.
Therefore, II is the only option that would NOT be considered a valid source of error in a laboratory experiment.
The answer is O II only.
I: Calculation errors would be considered a valid source of error in a laboratory experiment. If the calculations made during the experiment are incorrect, it can affect the accuracy of the results.
II: Inability to calibrate measuring devices would NOT be considered a valid source of error in a laboratory experiment. Calibrating measuring devices is an essential step in any experiment to ensure that the measurements being taken are accurate. If the measuring devices are not calibrated correctly, the results of the experiment will be invalid.
III: Using the wrong solution for a reaction would be considered a valid source of error in a laboratory experiment. If the wrong solution is used, the results of the experiment may not be accurate.
Therefore, II is the only option that would NOT be considered a valid source of error in a laboratory experiment.
Which statement best describes the difference between a theory and a law? A. Scientific theories explain WHY a phenomenon occurs and a scientific law explains WHAT occurs. B. Scientific theories explain WHAT occurs and a scientific law explains WHY a phenomenon occurs. C. They both explain why something happens. D. They both tell us what happens.
Scientific theories explain why a phenomenon occurs and a scientific law explains what occurs. The correct option is A.
What is scientific theory?A scientific theory is an explanation for a phenomenon in the natural world or the universe that has undergone extensive testing and verification using approved procedures for observation, measurement, and result evaluation.
A scientific law often describes an observed phenomenon. It doesn't explain the phenomenon's existence or its origins.
A scientific theory is the explanation for a phenomenon. It is a myth that with enough study, theories can become laws.
Thus, the correct option is A.
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what set of the following statements includes all the correct statements? i) six atoms in a plane always surround each atom in the closest packed structures ii) the repeating sequence of layers in closest packed metals is either abab or abca iii) an abca closest packing arrangement of metal atoms is the same as a body-centered cubic unit cell
The closest packed formations always have six atoms in a plane surrounding each atom.
What is the effectiveness of spheres filling the simple cubic structure?74% of the available space is effectively filled by the configuration in a cubic closest packing. The second layer of spheres is stacked on top of half of the first layer's depressions, much like in hexagonal closest packing.
Simple cubic packing – what is it?Placing spheres in Cartesian space with their centers at integer coordinates is known as simple cubic packing. Face-centered cubic packing is achieved by layering closely packed spheres such that every third layer's spheres overlap one another.
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How many grams are in 0.0823 moles of Ar? given; unknown:
Answer:
3.2877204
Explanation:
One mole of oxygen gas is at a temperature of 30°C. If the gas is heated at constant volume until the pressure triples, what is the final temperature?
A. 60°C
B. 50°C
C. 363 K
D. 423 K
tysm! :)
Considering the Gay-Lussac's law, the final temperature when the gas is heated at constant volume until the pressure triples is 909 K or 636° C.
Gay-Lussac's lawGay-Lussac's law establishes the relationship between the temperature and pressure of a gas when the volume is constant. This law says that the pressure of a gas is directly proportional to its temperature: if the temperature increases, the pressure will increase, while if the temperature decreases, the pressure will decrease.
Mathematically, Gay-Lussac's law states that the ratio between pressure and temperature always had the same value:
P÷ T= k
where
P is the pressure.T is the temperature.k is a constant.Analyzing an initial state 1 and a final state 2, it is fulfilled:
P₁÷ T₁= P₂÷ T₂
Final temperatureIn this case, you know that the gas is heated at constant volume until the pressure triples. This is, P₂=3×P₁
Replacing in Gay-Lussac's law:
P₁÷ T₁= (3×P₁)÷ T₂
T₂× (P₁÷ T₁)=(3×P₁)
T₂= (3×P₁)÷ (P₁÷ T₁)
T₂= 3×T₁
If one mole of oxygen gas is at a temperature of 30°C of 303 K (being 0 C= 273 K), then:
T₂= 3×303 K
T₂= 909 K = 636° C
Finally, the final temperature is 909 K or 636° C.
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How many moles of sodium hypobromite (NaBrO) should be added to 1.00 L of 0.050 M hypobromous acid
(HBrO) to form a buffer solution of pH 9.15? (Assume that no volume change occurs when the NaBrO is added)
(Ka=2.5x10)
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.050moles of sodium hypobromite (NaBrO) should be added to 1.00 L of 0.050 M hypobromous acid (HBrO) to form a buffer solution of pH 9.15
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in litre
Where,
moles= ?
volume= 1.00 L
Molarity=0.050 M
Substituting values in equation, we get
0.050=number of moles of solute/1.00
number of moles of solute=0.050moles
Therefore, 0.050moles of sodium hypobromite (NaBrO) should be added to 1.00 L of 0.050 M hypobromous acid (HBrO) to form a buffer solution of pH 9.15
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for the reaction below identify the structure of the product with appropriate formal charges and the appropriate number of hydrogens on the nitrogen atom
The given question is incomplete, hence, can not be answered. Still, adding some relevant information for your reference.
What are formal charges?
Formal charge (FC) is the charge associated with the atoms in a molecule, assuming that the electrons of all chemical bonds are shared equally between atoms, regardless of their relative electronegativities. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.
In chemistry, the formal charge in the covalent view of a chemical bond is assigned to the atoms in a molecule assuming that all chemical bond electrons are equally shared between atoms, regardless of their relative electronegativities. is the virtual charge that Simply put, the formal charge is the difference between the number of valence electrons of an atom in the neutral free state and the number assigned to that atom in the Lewis structure. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.
The given question is incomplete, hence, can not be answered. Still, adding some relevant information for your reference.
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Chemistry Worksheet, Atomic Number and Mass Number
Atoms are composed of electrons, protons, and neutrons. It is the difference in the numbers of protons in the atoms that determine the different elements. You can determine the composition of an atom of any element from its atomic number and its mass number. What is the difference between mass number and atomic number?
What is meant by the statement "Atoms are electrically neutral" ?
What does the atomic number of each atom represent?
The atomic number of an atom is the number of protons in the nucleus of the atom, while the mass number is the total number of protons and neutrons in the nucleus. The atomic number is unique to each element and determines the identity of the element, while the mass number is a measure of the mass of the atom and can vary within an element.
Atoms are electrically neutral when the number of protons in the nucleus is equal to the number of electrons orbiting the nucleus. This means that the positive charge of the protons is balanced by the negative charge of the electrons, resulting in an overall neutral charge for the atom.
The atomic number of each atom represents the number of protons in the nucleus of the atom. This number is unique to each element and determines the identity of the element. For example, the atomic number of hydrogen is 1, which means that it has one proton in its nucleus and is therefore a unique element. The atomic number is used to arrange the elements in the periodic table and is an important property of atoms.
Which atomic model is the one accepted by scientists today?
A) Dalton's model
B) Rutherford's model
C) quantum mechanical model
D) Bohr's model
The sodium (Na) content of 1 particular can of soup is 890 mg sodium in 1 c. What is the molarity of sodium (Na) in the soup? (Note: 4 c = 1 qt, and 1 qt = 0.946 L.) (3 points)
Answer:
0.164 M
Explanation:
Molarity is defined as moles of solute per liter of solution. In order to arrive at the desired units, dimensional analysis must be performed.
To find moles of sodium:
[tex]890\ mg\ Na(\frac{1\ g}{1000\ mg})(\frac{1\ mol\ Na}{22.99\ g\ Na})=0.0387\ mol\ Na[/tex]
To find liters of solution:
[tex]1\ cup(\frac{1\ qt}{4\ cups})(\frac{0.946\ L}{1\ qt})=0.2365\ L[/tex]
The ratio of sodium to solution can then be written as [tex]\frac{0.0387\ mol}{0.2365\ L}[/tex]. This can be simplified by dividing the numbers, [tex]0.164\frac{mol}{L}[/tex] or 0.164 M.
arrange the sequence of events that occur in complex i in their proper order. fe 2 is oxidized to fe 3 while coenzyme q is reduced to coqh2 nadh is oxidized to nad while fmn is reduced to fmnh2. fmnh2 is oxidized while fe 3 is reduced to fe 2 reduced coqh2 is released.
In the following reactions, NADH is converted to NAD+, FMN to FMNH2, Fe+2 to Fe+3, and CoQ to CoQH2.
What takes place when a substance oxidizes?When an electron is taken away from a molecule throughout a chemical reaction, the process is known as oxidation. What occurs during oxidation? There is an electron transfer during oxidation. In other words, there is an electron loss during oxidation.
What does the word "oxidized" in chemistry mean?The removal of electrons from the a material causes oxidation. Additionally, it is when a material gains oxygen. When magnesium combines with oxygen to generate magnesium oxide, for instance, it is oxidized: The compound magnesium oxide is created when magnesium and oxygen are combined.
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Researchers investigated the influence of environmental pH on the activity of peroxidase, an enzyme that catalyzes the conversion of hydrogen peroxide to water and oxygen gas. In an experiment, the researchers added a hydrogen peroxide solution containing guaiacol to several identical test tubes and adjusted the solution in each test tube to a different pH. The researchers included the guaiacol because it caused the solutions to change color as the reactions proceeded, which the researchers relied on for measuring reaction rates. Finally, the researchers added the same amount of peroxidase to each test tube and measured the rate of each reaction at 23°C. The results of the experiment are represented in Figure 1. One of the researchers proposes using oxygen gas production to measure reaction rates. Which of the following statements best justifies the use of the proposed modification as a way of creating an appropriate control for the investigation?
O the experiment can be repeated without hydrogen peroxide, which will help eliminate an uncontrolled variable. O the experiment can be repeated without hydrogen peroxide, which will help eliminate an uncontrolled variable. O the experiment can be repeated without peroxidase, which will introduce a second independent variable. O the experiment can be repeated without peroxidase, which will introduce a second independent variable. O the experiment can be repeated without guaiacol, which will reveal the effect of guaiacol on the reaction rates. O the experiment can be repeated without guaiacol, which will reveal the effect of guaiacol on the reaction rates. O the experiment can be repeated without water, which will reveal whether the reaction can occur inside a living cell.
In studying the influence of environmental pH on peroxidase activity, researchers can repeat the experiment without guaiacol, which will reveal the effect of guaiacol on reaction rates.
The proposal to use the production of gaseous oxygenOne of the investigators' proposal to use oxygen gas production to measure reaction rates leads to a change in the dependent variable.
In the first experiment the dependent variable was the volume of guaiacol and in the second experiment the dependent variable will be oxygen production.
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every day radio are passing right through your body without you even noticing. radio waves have a frequency of about 10^8 Hertz. Calculate the energy of a radio wave
The energy of the wave can be obtained as 6.6 * 10^-16 J.
What is the energy of the wave?We know that the energy of a wave has to do with the energy that is possessed by the wave and we can be able to obtain this energy by the means of the equation of Max Plank.
We know that we have the following equation;
E = hf
h = Plank's constant
f = Frequency of the wave
Then we have;
E = 6.6 * 10^-34 Js * 1 * 10^18 Hz
E = 6.6 * 10^-16 J
The radio waves have an energy of about 6.6 * 10^-16 J.
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Write the abbreviated electron configuration for Al2+.
The abbreviated electron configuration for Al2+ is [Ne]3s2 3p1
since Al has 13 electrons : [Ne]3s2 3p1
Al2+ means it has lost 2 electrons to become : [Ne]3s1
what is electron configuration?Electronic configurations in chemistry can be describe as the way each electron move independently in an orbital, in an average field created by all other orbitals. which also means the arrangement of electrons in orbitals around an atomic nucleus.
what is an electron?An electron in simple term is a negatively charged subatomic particle that binds together with protons and neutrons to form an atom's nucleus. it can also be seen as a tiny particle of matter that is smaller than an atom and has a negative electrical charge in it.
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What would be the concentration of a solution made by adding 250 mL of water to 45.0
mL of 4.2 M KOH?
Answer:
Explanation:
The most common way to solve this problem is to use the formula
c
1
V
1
=
c
2
V
2
In your problem,
c
1
= 4.2 mol/L;
V
1
= 45.0 mL
c
2
= ?;
V
2
= 250 mL
c
2
=
c
1
×
V
1
V
2
= 4.2 mol/L ×
45.0
mL
250
mL
= 0.76 mol/L
In which of these substances are the atoms held together by polar covalent bonding?
A) SrCl₂
B) CsCl
C) ClF
D) TiF₂
E) S₈
Substances in which atoms are held together by polar covalent bonding is b)CsCl.So,correct option is b.
Polar covalent bond is a kind of compound bond where one sets of electrons is shared unevenly between two molecules. For instance, Hydrogen chloride (HCl) particle. The holding of hydrogen and chlorine iotas inclines more towards Cl particles since Cl is more electronegative in nature than hydrogen
Since Cs has one unpair of electron and Cl has five unpair electron. So, both of elements are favorable for formation of covalent bond.
Properties of Polar Covalent Compound
Physical state: These mixtures can exist as solids because of more noteworthy power of collaborations.Melting and boiling point: These have more prominent liquefying and limit than non-polar mixtures.Conductivity: They direct power in the arrangement state because of the portability of particles.Dissolvability: These are exceptionally dissolvable in polar solvents like water.Hence,correct option is B.
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how many grams of milk of magnesia, mg(oh)2 (s) (58.3 g/mol), would be soluble in 200 ml of water. ksp
200 ml of water would be sufficient to dissolve 1.166g of milk of magnesia, mg(oh)2 (s) (58.3 g/mol).
Magnesium has what purpose?It is a laxative (of the osmotic variety), and its mechanism of action is assumed to include pulling water into the intestines, which aids in causing bowel movement. The symptoms of having too much stomach acid, such as heartburn, an upset stomach, or indigestion, are also treated with this medicine.
MgCl2 +2NaOH→Mg(OH)2+2NaCl
moles of mg(oh)2 in 200ml of 58.3 M solution = 58.3 ∗200/10000.
=1.166g
according to above equation, for 1 mole of MgCl2
we require 1 mole of NaOH
so, NaOH is a limiting reagent.
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A sample of ore containing the mineral tellurite, TeO2 , was dissolved in acid. The resulting solution was then
reacted with a solution of K2Cr2O7 to form telluric acid, H2TeO4 . The unbalanced chemical equation for the
reaction is given below.
The molecule or ion that is being oxidized in the reaction is TeO2. Ceramics may occasionally be colored using tellurium dioxide.
TeO2 does water dissolve TeO2?TeO2 is soluble in strong acids, alkali metal hydroxides, and only very little water. Due to its amphoteric nature, it can operate as either an acid or a base depending on the solution it is in. It interacts with bases to form tellurites and acids to create tellurium salts.
TeO2's form is what?Due to the presence of 6 e-pairs surrounding the center atom, 6 atoms bound to it, and 0 lone pairs, this molecule is octahedral.
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The complete question is:
A sample of ore containing the mineral tellurite, TeO2 , was dissolved in acid. The resulting solution was then
reacted with a solution of K2Cr2O7 to form telluric acid, H2TeO4 . The unbalanced chemical equation for the
reaction is given below.
. . . TeO2(s) + . . . Cr2O72−(aq) + . . . H+(aq) → . . . H2TeO4(aq) + . . . Cr3+(aq) + . . . H2O(l)
(a) Identify the molecule or ion that is being oxidized in the reaction.
Calculate the change in the internal energy of a gaseous system that absorbs 21 J of heat and does 8.0 J of work by expanding.
A. 32 J
B. –32 J
C. –29 J
D. 29 J
E. 13 J
F. –13 J
The change in the internal energy of a gaseous system that absorbs 21 J of heat and does 8.0 J of work by expanding is 13 J
Energy can only be transformed; it cannot be created or destroyed, according to the First Law of Thermodynamics. For any system, energy transfer examples include mass crossing the control border, external work, or heat transfer over the barrier. The vigor and vitality required for ongoing physical or mental activity is referred to as energy. Heat is the transfer of kinetic energy between two substances, or from an energy source to a material or object. Any action that needs both mental and physical effort to achieve a goal or result is considered work.
ΔE˭q˖w
q= heat added or lost from system
w= work done by system or on system
q is negative when heat is lost
w is negative when a system affects its environment
here, q˭21 and w˭8
ΔE˭21˖(˗8)
ΔE˭13 J
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categorize the pairs of variables given below as directly or inversely proportional for an ideal gas. for each pair, assume all other variables are held constant.
Directly inversely correlated are the following quantities: pressure and absolute temperature, volume and moles, volume and absolute temperature, and density and molar mass. Volume and pressure are inversely correlated.
In chemistry, what exactly is a molar mass?A substance's molar mass is defined as its molecular weight in grams. By adding the molar masses of a substance's constituent atoms, as demonstrated in this video, we may get the substance's molar mass. Then, to convert between mass and the quantity of moles of the material, we may utilize the computed molar mass.
What else do you call molar mass?The sum of all the atoms' individual masses in grams that make up a mole of a certain molecule is known as the molar mass, sometimes referred to as molecular weight.
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which of the following options correctly describe the units used to express electrical potential, charge, and electrical energy? select all that apply. multiple select question. the unit for electrical charge has the symbol f. the volt is the unit for electrical potential. electrical energy can be measured in joules. 1 joule
In joules, electrical energy could be quantified.Volts are used to measure electrical potential.
What units are employed to express the potential of an electric cell?When referring to this attribute in relation to electrical applications, it is more frequently referred to as voltage. Voltage is a measurement of the energy that accompanies the transfer of charge.The unit of measurement for potentials is the volt (V), which is equal to one joule in energy for every coulomb of charge.
What is potential energy in a cell?The potential differential between both the two electrodes of an electrochemical cell, which develops when electrons are transmitted through the open circuit of the a cell that has not yet reached equilibrium, is known as the cell potential.
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How many molecules are in a 0.00583 mole sample of H₂O?
Answer:
3.51 x 10²¹ molecules H₂O
Explanation:
To find the amount of molecules in the sample, you need to multiply the amount of moles by Avogadro's Number. Avogadro's Number is a ratio comparing the amount of molecules per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator). The final answer should have 3 sig figs like the given value (0.00583 = 3 sig figs).
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
0.00583 moles H₂O 6.022 x 10²³ molecules
-------------------------------- x -------------------------------------- = 3.51 x 10²¹ molecules
1 mole