7. Balance the following reaction under basic conditions: Al (s) + Cr2O72- (aq) -> Al3+ (aq) + Cr3+ (aq)
8. What is the ^o of the following balanced redox reaction (use the reduction potentials provided in Table 11.1
below)?
Fe3+ (aq) + Au (s) -> Fe (s) + Au3+ (aq)
9. What is G for the reaction below – calculate it from the ^o ?
Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s)
Answers
The free energy change of the reaction; Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s) is calculated to be -443.83KJ/mol.
For the reaction shown in question 7, we can divide it into half equations as follows;
Oxidation half equation;
6 Al (s) -------> 6Al^3+(aq) + 18e
Reduction half equation;
3Cr2O7^2-(aq) + 42H^+(aq) + 18e -----> 6Cr^3+(aq) + 21H2O(l)
The balanced reaction equation is;
6Al(s) + 3Cr2O7^2-(aq) + 42H^+(aq) -----> 6Al^3+(aq) + 6Cr^3+(aq) + 21H2O(l)
The E° of this reaction is obtained from;
E° anode = -0.04 V
E°cathode = +1.50 V
E° cell = +1.50 V - (-0.04 V) = 1.54 V
Given that;
ΔG° = -nFE°cell
n = 3, F = 96500, E°cell = 1.54 V
ΔG° = -(3 × 96500 × 1.54)
ΔG° = -443.83KJ/mol
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Related Questions
a bond in which only one pair of
electrons is shared?
Answers
Answer:
A single covalent bond
Explanation:
A single covalent bond is when only one pair of electrons is shared between atoms. A sigma bond is the strongest type of covalent bond, in which the atomic orbitals directly overlap between the nuclei of two atoms.
Answer:
Single covalent bond.
Explanation:
Single covalent bond is the type of bond in which only one pair of electrons is shared between atoms.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807What’s clues indicate that a chemical reaction has occurred?
Answers
Answer:
Color change, formation of bubbles, and temperature change
what is waves is energy passing through the medium of water? true or false
Answers
i have no idea what you said but for the sake of god its true
how many kernels are in a bag of microwave popcorn?
Answers
What is chemistry,define it ?
Answers
Answer:
the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
Explanation:
Hope this helps!
two different isotopes of an element have different
Answers
Answer:
atomic weight or number of neutrons.
Explanation:
An isotope: is one of two or more forms of the same chemical element.
Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number.
A different number of neutrons giving each elemental isotope a different atomic weight.
If a 425 gram sample of Uranium-235 had a half-life of 8 days, how much of the sample would remain after 16 days?
type your answer
grams
Answers
The clouds of Venus consist mainly of ______. Group of answer choices carbon monoxide droplets of water vapor hydrogen and helium droplets of sulfuric acid gaseous nitrogen
Answers
Answer:
droplets of sulfuric acid
Explanation:
If you were a scientist investigating the effects of antioxidants in foods, what would you test and why?
Answers
Answer:
One possible reason why many studies on antioxidant supplements do not show a health benefit is because antioxidants tend to work best in combination with other nutrients, plant chemicals, and even other antioxidants.
Explanation:
Why are polyatomic called radicals
Answers
How many grams of hydrogen gas are needed to react completely with 54.0 g of oxygen gas, given the following balanced chemical reaction:
2H2 +O2 --->2H2O
Answers
Answer:
6.75g of hydrogen will completely react with 54g of oxygen
Explanation:
What is the chemical composition of dry ice?
Answers
Answer:
Dry ice is the solid form of carbon dioxide (CO 2), a molecule consisting of a single carbon atom bonded to two oxygen atoms. Dry ice is colorless, odorless, and non-flammable, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H 2 CO 3).
Explanation: i asked my teacher and this was her response.
The molecular formula for a compound with a molar mass of 180.18g that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass is
Answers
Answer:
C6H12O6
Explanation:
First you need to find the empirical formula by the percents that they're giving you. You assume that is 100 grams and if for example you have 40% of carbon you will have 40 grams of carbon.
1.Find the number of moles of each atom
C: 40g÷12g/mol= 3.33 mol
H: 6.7g÷1g/mol= 6.7 mol
O: 53.3g÷16g/mol= 3.33 mol
You divide all ratios by the minimum ratio and you obtain the empirical formula
CH2O
Since you're given the molar mass, you now have to find the molar mass of CH2O by adding the molar mass of each element present and repeated in the compound.
CH2O= 30g/mol
Now you know that the molar mass of the molecular formula we are looking for is 180.18 g/mol, and since the empirical formula is the molecular formula in its smaller ratio, by logic you can say that:
180.18g/mol ÷ 30g/mol= 6
So, you now know that the empirical formula is being multiplied by a factor of 6 to reach a compound with a molar mass of 180.18g/mol, so you multiply each subscript of the empirical formula by 6 obtaining:
C6H12O6
The____ is the basic unit of life
Answers
Answer:
cell
Explanation:
Cells are the most simple, basic units of life
Answer:
the CELL is the basic unit of life.
Explanation:
I had this is my science lesson
have a great day!
hope this helps!
feel free to mark as brainliest! ;)
When a solution of cesium chloride (CsCl) is subjected to high-speed centrifugation, a stable density gradient is formed.
a. True
b. False
Answers
explain why titanium conducts electricity
Answers
Answer:
Because they are electrical conductors because their delocalized electrons carry electrical charge through the metal. they are good conductors of thermal energy because their delocalized electrons transfer energy.
I hope it helps.
Which compound contains both sigma and pi bonds? HCCl3 H2CO H2S HBr.
Answers
The compound that contains both sigma and pi bonds has been [tex]\rm \bold{H_2CO}[/tex]. Thus, option B is correct.
The compounds have been resulted by the sharing of the valence electrons between atoms, for the completion of octet of each elements.
The bonds can be saturated with the presence of only sigma bond. The unsaturated bonds has presence of pi bonds as well. The bond with one pi and one sigma has been a double bond, while 1 sigma and 2 pi has been a triple bond.
The bonds present in the following structures has been:
[tex]\rm HCCl_3=4\;\sigma\;bonds\\H_2CO=2\;\sigma,\;1\;\pi\;bond\\H_2S=2\;\sigma\;bonds\\HBr\;=1\;\sigma\;bond[/tex]
The compound with the presence of both sigma and pi bonds has been [tex]\rm \bold{H_2CO}[/tex]. Thus, option B is correct.
For more information about the sigma and pi bonds, refer to the link:
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The compound of ammonium sulfate consists of two ions. NH4+ and SO42- both of which are polyatomic ions. a molecule of the compound consists of (one, two , or four) NH4+ ions and (one, two, or four) SO42- ions?
Answers
Answer:
Blank #1: Polyatomic
Blank #2: 2 (see explanation)
Blank #3: 1 (see explanation)
Explanation
Both the ammonium ion and the sulfate ion contain more than one atom in each ion. The two species are thus polyatomic. The chloride ion , for example, is monoatomic.
Superscripts above formulae of the ions indicate their charge. Each ammonium ion carries a positive one (+1) charge. Each sulfate ion carries a charge of negative two (-2).
Ammonium sulfate is an ionic compound. A sample of this compound contain myriads of ammonium ions and sulfate ions. The ions are packed in three-dimensional lattices. Thus unlike water, ammonium sulfate does not exist as molecules in nature.
Assuming that the second and third blanks refers to a formula unit, rather than a molecule, of ammonium sulfate. The empirical formula of ammonium sulfate gives the minimum whole-number ratio between the two ions in a sample.
Charges shall balance between the two ions. Ammonium ions are of charge +1. Sulfate ions are of charge -2. The sample shall thus contain two ammonium ions for every one sulfate ion.
The empirical formula of ammonium sulfate is therefore .
There are thus two ammonium ions and one sulfate ion in each formula unit of ammonium sulfate.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, a molecule of the ammonium sulfate consists of one NH₄⁺ ions and one SO₄²⁻ ions.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. The compound of ammonium sulfate consists of two ions. NH₄⁺ and SO₄²⁻ both of which are polyatomic ions. A molecule of the ammonium sulfate consists of one NH₄⁺ ions and one SO₄²⁻ ions.
Therefore, a molecule of the ammonium sulfate consists of one NH₄⁺ ions and one SO₄²⁻ ions.
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40 PIONTS!! PLZZZZ HELP
Determine whether each of the following will undergo dissociation,
dissolving or ionization. Then write the solvation equation for each
substance:
a) Lithium oxide
b) Magnesium nitride
c) Hydrobromic acid
Answers
Lithium oxide is able to undergo both the processes of dissolution and dissociation.
Dissociation refers to the break down a chemical substance into its constituents. Ionization refers to the loss of electrons from a chemical specie while dissolving refers to the ability of a solid to form a solution.
Let us now look at each of the following species;
Lithium oxide undergoes dissolution and dissociation. Magnesium nitride undergoes dissolution and dissociation.Hydrobromic acid undergoes dissolution and dissociation.Learn more about ionization: https://brainly.com/question/1602374
Countercurrent Flow
Which filter regions have a concentration gradient between the blood and dialysate?
Check all that apply.
Answers
Answer: All options (I, II, III, IV, V)
Explanation: The answer is all options because they never reach equilibrium or intersect at a region as the both decrease at the same rate.
Answer: Picture shows the correct one
Explanation:
2) Imagine that a loudspeaker is producing quiet note with a low pitch
How will it’s viberation change
a) If the pitch of the note becomes higher?
b) If the note become louder
Answers
Answer:
Higher pitched sounds produce waves which are closer together than for lower pitched sounds. (Think of the slinky - if you produce waves rapidly they will travel quite close to each other, thus demonstrating a higher pitched sound.)
The pitch of a note will depend on a number of factors. One of these is the size of the vibrating object. On a glockenspiel or xylophone the high notes are made by the smaller bars. A smaller triangle or cymbal will make a relatively higher pitch note. On a stringed instrument such as a guitar or violin a thinner string will generally make a higher note, but also shortening the string by stopping it with the finger will produce a similar effect. On a set of pan pipes or a church organ it is the shorter pipes which make the higher notes when the air inside them vibrates.
Another factor which produces higher pitched notes is the tension within the vibrating object. A guitar string can be tuned to a higher pitch by adjusting the string tensioner. An elastic band can be stretched tighter and a drum skin can be tensioned to increase the pitch of the sound it produces.
What does a chemical equation show that a word equation does not
Answers
Answer: I do believe it shows variables.
Explanation:
Which sentence best describes what happens during a change of state from a solid to a liquid?
A. The temperature stays the same and the particle speed increases
B. The temperature increases and the particle speed stays constant.
C. The temperature decreases and the particle speed decreases.
D. The temperature stays the same and the particle speed stays constant.
Answers
Answer:
The temperature stays the same and the particle speed stays constant
Mass is the amount of matter in an object, but
weight is
A. the size of the matter.
B. the amount of space matter takes up.
C. the shape of the matter.
D. gravity's pull on the matter.
Answers
Answer: is equal to the gravitational pull on an object
Explanation:
what is the chemical formula of tetraphosphorus heptasulfide?
Answers
Answer: P4S7
Explanation:
Name one nutrient indicator and explain how it works.
Answers
Answer:
Hi this is Adhira please make me as brainlist
Explanation:
The nutritional status indicators for the CDC Growth Charts include obesity, overweight, underweight, and short stature. Percentiles are used to rank an individual or a group on a growth chart and indicate where either fits in the context of the reference population
HELLLPPPP ASAP !!!! Pls
Answers
Answer:
Melting point, boiling point, state of matter at room temperature, heat of vaporization, flammability and reactivity
Explanation:
True or False. When light passes from one medium to another the speed changes.
Answers
Answer:
Its actually true
Explanation:
Your Welcome Canada,
OH YEAH!!!!!!
Answer:
The correct answer is "True".
Explanation:
I hope this helps!
How many grams are in 3.4 moles of Lead (IV) Sulfate (Pb(SO4)2)? ) Molar mass: 303.26 g/mol 131.0840
Answers
Answer:
1031.084g
Explanation:
n=m/M
m=n(M)
m = (3.4mol)(303.26g/mol)
1031.084g
Hope that helps
Answer:
1031.08
Explanation:
You start with 3.4 moles and you know that 6.022 x 10 ^ 23 = 1 mole( Avogadro's Number), so you just multiply those 2 numbers and the moles will cancel leaving you with grams of Lead Sulfate.
Which neutral atom is isoelectronic with N-3?
Answers
The neutral atom is isoelectronic with N⁻³ is Neon (Ne).
Isoelectronic are those which have same number of electrons or we can say that same electronic structure.
For finding out that the species are isoelectronic , we just have to count there no. of electrons of atoms and if they have same no. of electron then they said to be isoelectronic species.
no. of electrons in Nitrogen N = 7 ( atomic no.)
no. of electrons in Nitride ion N⁻³ = 7 + 3 = 10
no. of electrons in Neon Ne = 10 ( atomic no. and neutral atom)
so, no. of electrons in Nitride ion N⁻³ = no. of electron in Neon Ne
this means , N⁻³ , Nitride ion is isoelectronic with Neon Ne.
Thus, The neutral atom is isoelectronic with N⁻³ is Neon (Ne).
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