AnswersMI-Chemistry A-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

25 verified answers1 views
1
Free Preview

In which two types of reactions do opposite chemical changes occur?

A
double replacement and combustion
B
single replacement and double replacement
C
synthesis and decomposition
D
combustion and synthesis
2
Free Preview

If a substance reacts with oxygen, the chemical reaction is most likely a

A
combustion reaction.
B
decomposition reaction.
C
single replacement reaction.
D
double replacement reaction.
3

Which law is described by saying that when the pressure of a gas in a sealed container is cut in half, the gas will double in volume at a steady temperature?

A
Boyle’s law
B
Charles’s law
C
Dalton’s law
D
Gay-Lussac’s law
4

Which of these properties is the best one to use for identification of an element?

A
the number of neutrons in the atomic nucleus
B
the number of protons in the atomic nucleus
C
the number of isotopes that are formed by the element
D
the number of charges on ions of the element
5

According to the enthalpy diagram below, which of the following statements is true?

Question illustration
A
Arrows A and D represent the enthalpy of the intermediate chemical reactions.
B
Arrow C represents the enthalpy of the overall chemical reaction.
C
Arrow C indicates that the third intermediate reaction is exothermic.
D
Arrow B indicates that the second intermediate reaction is exothermic.
6

Which is a set of valid quantum numbers?

A
n = 4, l = 4, m = 4
B
n = 1, l = –2, m = 0
C
n = –1, l = 0, m = 0
D
n = 4, l = 3, m = 3
7

Which is a component of John Dalton’s atomic theory?

A
The ratio of atoms in a compound can vary.
B
The atoms of a single element differ.
C
An atom is a small particle that cannot be broken down.
D
Atoms of different elements can be identical.
8

What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)?

A
Rb > K > Na > Li
B
K > Rb > Na > Li
C
Li > Na > K > Rb
D
Rb > K > Li > Na
9

Which shows the electron configuration for Silicon (Si)?

A
[Ar]4s23d104p4
B
[Ar]3d14s2
C
[Ne]3s23p4
D
[Ne]3s23p2
10

Which statement describes the valence electrons in metallic bonds?

A
They are shared equally between two atoms.
B
They are shared unequally between two atoms.
C
They are shared among many atoms.
D
They are transferred from one atom to another.
11

Which scientist’s law about the ratios of masses of elements in a compound did John Dalton’s work on the atomic structure help to explain?

A
Democritus
B
J. J. Thomson
C
Ernest Rutherford
D
Joseph Proust
12

Which statement defines specific heat capacity for a given sample?

A
the temperature of a given sample
B
the temperature that a given sample can withstand
C
the quantity of heat that is required to raise the sample’s temperature by 1°C (Kelvin)
D
the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure
13

Which statement best explains the purpose of using a mole in the measurement of matter?

A
It is commonly used as another unit of mass.
B
It allows chemists to deal with a large number of atoms.
C
It is used only for studying the properties of gases.
D
It explains that substances with the same moles have the same mass.
14

Digby wants to determine how many calories are in his bag of chips. Which calorimeter should he use?

A
coffee cup calorimeter
B
bomb calorimeter
C
He could use both types of calorimeters.
D
He cannot use either.
15

An ice cube is dropped into a glass of milk at 20°C. Which statement explains the transfer of kinetic energy (KE)?

A
Because milk has higher KE than ice, KE is transferred from the milk to the molecules of ice.
B
Because milk has higher KE than ice, KE is transferred from the molecules of ice to the milk.
C
Because ice has higher KE than milk, KE is transferred from the milk to the molecules of ice.
D
Because ice has higher KE than milk, KE is transferred from the molecules of ice to the milk.
16

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced if 11.0 mol of Al are produced?

Question illustration
A
8.25 mol
B
11.0 mol
C
14.7 mol
D
16.5 mol
17

The following balanced equation shows the formation of sulfur dioxide.S + O2 SO2How many moles of sulfur are needed to produce 15.0 mol of sulfur dioxide?

Question illustration
A
7.50 mol
B
10.5 mol
C
15.0 mol
D
30.0 mol
18

Which is most likely true about electronegativity?

A
It tends to be the same across a period.
B
It tends to be the same down a group.
C
It tends to increase across a period.
D
It tends to increase down a group.
19

A sample of octane (C8H18) that has a mass of 0.750 g is burned in a bomb calorimeter. As a result, the temperature of the calorimeter increases from 21.0°C to 41.0°C. The specific heat of the calorimeter is 1.50 J/(g • °C), and its mass is 1.00 kg. How much heat is released during the combustion of this sample?Use .

Question illustration
A
22.5 kJ
B
30.0 kJ
C
31.5 kJ
D
61.5 kJ
20

What is the electron configuration for helium (He)?

A
1s1
B
1s2
C
1s22s1
D
1s22s2

Did you find these answers helpful?

More from this Course

Quiz
15 verified answers

Unit Test

Quiz
15 verified answers

Unit Test

Quiz
15 verified answers

Unit Test