1) What is/are the spectator ion(s) for the following chemicalreaction? Check all that apply.

Pb(NO3)2(aq) + Na2S(aq) --> PbS(s) + 2 NaNO3(aq)

a)

Pb2+ ion

b) Na+ ion

C) S2- ion

D)

NO3- ion

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Question 2

What is the driving force of reaction 4B?

Neutralization

Gas formation

Single displacement

Precipitation

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Question 3

Predict the products of the following reaction:

Mg(s) + HCl(aq) -->

MgCl2 and H2

MgH and Cl2

MgCl and H

MgCl2 and H+

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Question 4

NaClO is commonly used as bleach. The following is a samplereaction of NaClO. What is the oxidizing agent in thisreaction?

3 NaClO + H2S --> 3 NaCl + H2O + SO2

NaCl

NaClO

H2S

SO2

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Question 5

When colorless Ba(NO3)2 solution mixes with colorless Na2SO4solution:

The color of solution will change

Some bubbles will be produced

Nothing obvious will happen

A precipitate will form

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Question 6

A test tube has a colorless aqueous layer of NaI solution and ancolorless organic layer of methylene chloride. When a few mL ofcolorless chlorine water is added to this test tube. The organiclayer became pink. What is causing this pink color in the organiclayer?

NaI

I2

NaCl

Cl2

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Question 7

Which of the following has the lowest concentration of H+?

They all have the same concentration of H+

0.1 mol HCl

0.1 mol HNO3

0.1 mol CH3COOH

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Question 8

What is the oxidation state of N in AgNO3?

+1

-1

-3

+3

+5

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Question 9

A water sample with unknown mass absorbed 100.0 J of heat andthe temperature increased from 25.0 C to 29.8 C. What is the massof this water sample? Specific heat of water = 4.184 J/(gC).

Note: To avoid any sig fig issues, please keep only two sig figsfor your input!!

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Question 10

Which one is correct about the following process?

CH4 + 2 O2 --> CO2 + 2 H2O

It is endothermic with positive enthalpy change.

It is exothermic with positive enthalpy change.

It is exothermic with negative enthalpy change.

It is endothermic with negative enthalpy change.

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Question 11

100.0 mL of 1.00 mol/L NaOH reacted with 65.4 mL of 1.00 mol/LCH3COOH solution and the temperature increased from 20 to 22 C. Howmany moles of NaOH get and CH3COOH are neutralized?

Note: to avoid any sig fig issues, please use regular decimalinstead of scientific notation and keep 3 sig figs for yourinput!!

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Question 12

At room temperature, H2SO4 is dissolved in water and thesolution is much hotter. So the dissolution of H2SO4

released some heat and has a negative enthalpy change

absorbed some heat and has a negative enthalpy change

absorbed some heat and has a positive enthalpy change

released some heat and has a positive enthalpy change