Midterm 1 Review

Midterm 1 Review

University

16 Qs

quiz-placeholder

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Midterm 1 Review

Midterm 1 Review

Assessment

Quiz

Chemistry

University

Practice Problem

Hard

Created by

Courtney Murphy

Used 20+ times

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16 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When the following redox equation is balanced with smallest whole-number coefficients, the coefficient for zinc will be.

Zn(s) + ReO4-(aq) → Re(s) + Zn2+(aq) (acidic solution).

2

7

8

16

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If 1.0 L of 1.0 M HCl spilled and needed to be neutralized, how many grams of the solid sodium carbonate (Na2CO3, 10 g/mol) would be required?

53

106

1060

530

212

3.

OPEN ENDED QUESTION

2 mins • Ungraded

What is the net ionic equation for the reaction of AgNO3 (aq) and KCl (aq)?

Evaluate responses using AI:

OFF

Answer explanation

Ag+ (aq) + Cl¯ (aq) --> AgCl (s)

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the oxidation state of nitrogen in HNO3?

+3

+1

-2

+5

-1

5.

FILL IN THE BLANK QUESTION

1 min • 1 pt

What is the oxidizing agent of this reaction?

3Mg + N2−−−−> Mg3N2

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Suppose that hydrochloric acid and aluminum are reacted to produce hydrogen gas. This hydrogen gas is collected by displacement of water at 25oC and a total pressure of 700torr. If the volume of the gas collected is 400mL, then how many moles of hydrogen were collected?

29.0 mmoles

11.0 moles

24.6 moles

14.6 mmoles

Answer explanation

For this question, we're told that a chemical reaction is producing hydrogen gas. In doing so, the gas is displacing a certain amount of water vapor. We're asked to determine the number of moles of gas produced in this process.

The amount of water displaced by the production of hydrogen gas will be the amount (volume) of hydrogen gas produced. To measure its pressure, we take the reading of the total pressure and then subtract from it the pressure of water vapor (since it contributes to the total pressure). Using this information, we can use the ideal gas equation to determine the number of moles of hydrogen gas.

Ptotal=Pwater+PH2

PH2=Ptotal−Pwater

PH2=700torr−23.8torr=676.2torr

676.2torr⋅1atm760torr=0.890atm

Next, we can use the ideal gas equation to solve for our answer.

PV=nRT

n=PVRT

n=(0.890atm)(400⋅10−3L)(0.08206L⋅atmmol⋅K)(298.15K)

n=1.46⋅10−2moles⋅1000mmoles1mole=14.6mmoles

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The following graph shows the distribution of molecular speeds for CO2 at four different temperatures. Which of the curves corresponds to the highest temperature?

a

b

c

d

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