AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

0 verified answers
1
Free Preview

A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. What is the partial pressure of the third gas, helium?Use .

Question illustration
A
0.22 atm
B
0.33 atm
C
1.03 atm
D
2.28 atm
2
Free Preview

Consider the balanced equation below.N2H4 + 2H2O2 N2 + 4H2OWhat are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water?

Question illustration
A
1:2 and 1:4
B
1:3 and 1:4
C
1:2 and 3:5
D
1:3 and 3:5
3

Based on the activity series provided, which reactants will form products?F > Cl > Br > I

A
CuI2 + Br2
Option A
B
Cl2 + AlF3
Option B
C
Br2 + NaCl
Option C
D
CuF2 + I2
Option D
4

Given below is a list of chemical reactions.1. Burning octane fuel2. Forming rust in an iron pipe3. Baking a cake4. Cement hardeningWhich sequence ranks the chemical reactions in order from fastest to slowest?

A
4, 3, 2, 1
B
1, 3, 2, 4
C
3, 2, 1, 4
D
1, 3, 4, 2
5

Catalysts are used in the oil industry to increase octane ratings in gasoline. Octane ratings tell how much fuel has to be compressed to promote better fuel ignition in some cars. Which of the following catalytic effects would be most beneficial for the oil industry?

A
Higher temperatures and pressures can be used.
B
Lower temperatures and pressures can be used.
C
Less product can be formed from a given amount of material.
D
More product can be formed from a given amount of material.
6

Two cups of coffee, one that is at 10°C and one that is at 20°C, are mixed. Which statement about the temperature of the mixture is correct?

A
There is no kinetic energy transfer so the temperature of the coffee in the warmer cup is the final temperature.
B
The kinetic theory dictates that the temperature of the coffee in the cooler cup is the final temperature.
C
Energy is transferred from faster moving molecules to slower moving molecules, and the result is the average of 15°C.
D
Energy transfer occurs as the molecules collide, and the result is additive; the final temperature is 30°C.
7

Consider the energy diagram below.Which statement best describes the diagram?

Question illustration
A
The pathway A-B-D involves a catalyst and is slower than A-C-D.
B
The pathway A-B-D involves a catalyst and is faster than A-C-D.
C
The pathway A-C-D involves a catalyst and is slower than A-B-D.
D
The pathway A-C-D involves a catalyst and is faster than A-B-D.
8

How does heat differ from temperature?

A
Temperature is the measure of heat.
B
Temperature and heat are the same thing.
C
Temperature measures thermal energy, and heat is the flow of thermal energy.
D
Temperature measures the loss of energy, and heat measures the gain of energy.
9

Which best describes the function of a centrifuge?

A
to separate the solute from the solvent
B
to separate the dissolved part of a solution into layers
C
to separate a mixture by heating it for a long period of time
D
to separate the undissolved particles of a mixture into layers
10

Consider the word equation.calcium hydroxide + hydrochloric acid calcium chloride + waterWhich is the corresponding formula equation?

Question illustration
A
Upper C a upper C l subscript 2 right arrow upper C a (s) plus upper C l subscript 2 (g).
Option A
B
Upper C a upper O (s) plus upper H subscript 2 upper O (l) right arrow upper C a (upper O upper H) subscript 2 (a q).
Option B
C
Upper N a upper O upper H (a q) plus 2 upper H upper C l (a q) right arrow upper N a upper C l (a q) plus 2 upper H subscript 2 upper O (l).
Option C
D
Upper C a (upper O H) subscript 2 (s) plus 2 upper H upper C l (l) right arrow upper C a upper C l subscript 2 (a q) plus 2 upper H subscript 2 upper O (l).
Option D
11

Which is a feature of a single replacement reaction?

A
Substance XYZ breaks down into X and YZ.
B
Substance G reacts with compound XY to form GY and X.
C
Substance X burns rapidly in the presence of oxygen.
D
Substance QR and GT exchange ions with each other.
12

Which of the following shows a Bronsted-Lowry acid reacting?

A
CO + NO2 CO2 + NO
Option A
B
NH3 + H+ NH4+
Option B
C
+ H+ HCO3–
Option C
D
HCl + H2O H3O+ + Cl–
Option D
13

Which value is most likely to be the pH of a salt solution that is formed by the reaction of a strong acid and a weak base?

A
2.0
B
7.0
C
8.0
D
10.0
14

Ethyne (C2 H2 (g), Hf = 226.77 kJ/mol) undergoes complete combustion in the presence of oxygen to produce carbon dioxide (CO2 (g), Hf = –393.5 kJ/mol ) and water (H2 O(g), Hf = –241.82 kJ/mol) according to the equation below.What is the enthalpy of combustion (per mole) of C2 H2 (g)? Use .

Question illustration
A
–2511.2 kJ/mol
B
–1255.6 kJ/mol
C
–862.1 kJ/mol
D
–431.0 kJ/mol
15

What is taking place in a reaction as the curve on a reaction pathway graph goes up?

A
Heat is being released.
B
Heat is being absorbed.
C
The reaction has stopped.
D
The reaction is slowing down.
16

Which value is most likely to be the pH of a salt solution that is formed by the reaction of a weak acid and a strong base?

A
2.0
B
6.8
C
7.0
D
8.7
17

The image shows what happens when an antacid tablet is placed in water.The process shown in the image can best be described as a

Question illustration
A
rapid chemical reaction where gas is released.
B
slow chemical reaction where light is being given off.
C
slow chemical reaction where the liquid changes color.
D
rapid chemical reaction where heat is suddenly released.
18

The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how has the pressure of the gas changed?

A
It has increased to two times its original value.
B
It has increased to four times its original value.
C
It has decreased to one-half its original value.
D
It has stayed the same.
19

Consider the reaction below.2C6H14 + 19O2 12CO2 + 14H2OHow many moles of hexane (C6H14) must burn to form 18.4 mol of carbon dioxide?

Question illustration
A
1.53 mol
B
3.07 mol
C
110. mol
D
175. mol
20

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?Use .

Question illustration
A
0.171 J/(gi°C)
B
0.548 J/(gi°C)
C
15.9 J/(gi°C)
D
86.6 J/(gi°C)

Did you find these answers helpful?

More from this Course

Quiz
50 verified answers

Cumulative Exam

Assignment
11 verified answers

Unit Test Review

Quiz
10 verified answers

Writing and Balancing Chemical Equations