CO2(g)+2H+(aq)+2e−→HCOOH(l) Eo=−0.20V

Which of the following substances oxidizes HCOOH(l)?

Select one:

Pb2+(aq)

Pb(s)

Zn2+(aq)

Zn(s)

the energy from an alkaline battery is generated by the following equation.

Zn(s)+2MnO2(s)→ZnO(s)+Mn2O3(s)

During the operation of the alkaline battery, which of the following observations can be made?

Select one:

The amount of MnO2(s) increases as Zn(s) is reduced.

The amount of Zn(s) increases as MnO2(s) is reduced.

The amount of MnO2(s) decreases as Zn(s) is oxidized.

The amount of Zn(s) decreases as MnO2(s) is oxidized.

How do you calculate mass when given efficiency?

The charge in coulombs that a battery produces when it discharges 250 A for 15.0 s, expressed in scientific notation is a.bc x 10^d C. The values of a, b, c and d are

In an electrochemical cell, 150 C of charge is transferred in 1.5 min. The electric current is determined to be _________Answer A. 

The time to transfer 1.25 x 10³ C using a current of 7.00 A is_____ Answermin 

The time to deposit 15.0 g of silver from a silver nitrate solution using a 6.00 A current is__________ Answer__________minutes.

make sure the answers are rounded  correctly

In an experiment to study the reactivity of different substances, the following observations were made.

Tl1+(aq) + 2 V3+(aq) → Tl3+(aq) + 2 V2+(aq) no evidence of a reaction

2V3+(aq) + In1+(aq) → 2V2+(aq) + In3+(aq) spontaneous reaction

2 Rh4+(aq) + Tl1+(aq) → 2 Rh3+(aq) + Tl3+(aq) spontaneous reaction

Using the above results, construct a table of reduction half-reactions that contains four half-reactions.

Write another equation that is a spontaneous reaction 

3Cl2(g) + 6NaOH(aq) →5NaCl(aq) + NaClO3(aq) + 3H2O(l)

CO2(g) + H2O(l) → H2CO3(aq)

2 NH4Cl(aq) + Ca(OH)2(aq) →2 NH3(aq) + 2H2O(l) + CaCl2(aq)

2HNO3(aq) + 6HI(aq) →2NO(g) +3 I2(s) + 4H2O(l)

Identify which one is a redox reaction and which one is not a redox reaction. 

Which equation is an example of a disproportionation reaction? 

this is a titration question 

answer the following questions using the information provided below 

1. The moles of Cr₂O₇^2-(aq) that reacted, expressed in scientific notation, is a.bc x 10^-dmol. The values of a, b, c and d are 

2. The concentration of Sn²⁺(aq), expressed in scientific notation, is a.bc x 10^-d mol/L. The values of a, b, c and d are 

It has been determined that fluoride can prevent the decay of tooth enamel. Historically, tin(II) fluoride was added to toothpaste to help combat tooth decay. Titration analysis was used to determine the concentration of tin(II) fluoride in a NMmple of toothpaste. A 10.0 mL sample of tin(II) fluoride solution was acidified and titrated with 0.0100 mol/L potassium dichromate solution as represented by the following equation.

3Sn2+(aq)+Cr2O2−7(aq)+14H+(aq)→3Sn4+(aq)+2Cr3+(aq)+7H2O(l)

The following data was collected during the four trials.

IN AN EXPERIMENT TO STUDY THE SPONTANEITY OF REDOX REACTIONS, A STUDENT PLACED DIFFERENT METALS INTO FIVE SEPERATE TEST TUBES, EACH CONTAINING A DIFFERENT 1.0MOL/L SOLUTION, AS SHOWN BELOW. 

TEST TUBE 1- THE METAL IS Zn(s) in a solution of Fe(NO3)2(aq)

Test tube 2- the metal is Co(s) in a solution of Sn(NO3)2(aq)

test tube 3- the metal is Cu(s) in a solution of Cu(NO3)2(aq) 

tets tube 4- the metal is Au(s) in a solution of Cu(NO3)2(aq) 

test tube 5- the metal is Ag(s) in a solution of HNO3(aq) 

test tube 6- the metal is Ni(s) in a solution of AgNO3(aq)

for each test tube, determine which one is a spontaneous reaction and which one is not a spontaneous reaction. 

2. which of the entities will react spontaneously with Zn(s) but not with Cd(s) 

- Sn²⁺_(aq)

_- Mg²⁺_(aq)

- H2O(l)

- Cr³⁺_(aq)

 3. find the strongest SOA AND SRA

a solution of iron(II) chloride is mixed with an acidifed sodium nitrate 

b. solution of sodium hydroxide, potassium sulfite and chromium(II) nitrate are mixed. 

4. which of the following is an entity that will copper(II) ions and also oxidize metallic nickel

STRONG OXIDIZING AGENTS WILL HAVE STRONG AFFINITY FOR ELECTRONS AND TEND TO GAIN ELECTRONS 

IS THIS TRUE OR FALSE?

STRONG REDUCING AGENTS WILL HAVE STRONG AFFINITY FOR ELECTRONS AND TEND TO GAIN ELECTRONS 

IS THIS TRUE OR FALSE?

WEAK REDUCING AGENTS WILL HAVE A WEAK AFFINITY FOR ELECTRONS AND TEND TO LOSE ELECTRONS 

IS THIS TRUE OR FALSE?

Triangles ABC and DEF are both right triangles. Each has a hypotenuse length of 10 m. Is this enough information to conclude that the two triangles are congruent?