AnswersWA-Chemistry ATypes of Chemical Reactions

Types of Chemical Reactions — Cumulative exam Answers

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Consider the balanced equation below. What is the mole ratio of PCl3 to PCl5?

Question illustration
A
1:1
B
2:1
C
3:5
D
5:3
2
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What was Johann Dobereiner’s contribution to the development of the periodic table?

A
He arranged the elements according to increasing atomic mass.
B
He arranged the elements according to increasing atomic number.
C
He identified triads of elements that had similar properties.
D
He organized elements into four groups based on their properties.
3

A piece of sodium metal can be described as

A
a pure substance and a compound.
B
an impure substance that is reactive.
C
an impure substance that is unreactive.
D
a pure substance and an element.
4

Consider the substances below.• 1 mol of beryllium• 1 mol of salt• 1 mol of water• 1 mol of hydrogenWhich statement is true about these substances?

A
They have exactly the same mass.
B
They have different numbers of particles.
C
They have the same number of atoms.
D
They have different masses.
5

Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction?

A
sodium hydroxide + water sodium + hydrogen
Option A
B
sodium + water sodium hydroxide + hydrogen
Option B
C
sodium + hydrogen sodium hydroxide + water
Option C
D
sodium + sodium hydroxide water + hydrogen
Option D
6

[BLANK]

A
synthesis
B
polymerization
C
decomposition
D
oxidation
E
replacement
7

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
8

The chemical equation below shows the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2).4Al + 3O2 2Al2O3The molar mass of O2 is 32.0 g/mol. What mass, in grams, of O2 must react to form 3.80 mol of Al2O3?

Question illustration
A
60.8 grams
B
81.1 grams
C
122 grams
D
182 grams
9

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Question illustration
A
MgCl2
B
Mg2Cl2
C
Mg2Cl
D
MgCl
10

The pictures below show samples of different substances.The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?

Question illustration
A
No, because they have different masses.
B
No, because they have different volumes.
C
Yes, if each sample contains 6.02 x 1023 atoms.
D
Yes, if each sample contains 2 amu.
11

Which best characterizes a crystal?

A
a number of high speed particles moving randomly
B
a dense substance that is hard and incompressible
C
a high-energy state of matter made up of a swirling, ionized gas
D
a loose association of particles moving past one another
12

Which quantity is held constant when working with Boyle’s, Charles’s, and Gay-Lussac’s laws?

A
volume
B
moles
C
pressure
D
temperature
13

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?

A
The modern model is not as widely accepted by scientists as Dalton’s model.
B
The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.
C
The modern model recognizes particles in the atom, whereas Dalton’s model does not.
D
The modern model does not explain emission spectra, whereas Dalton’s model does.
14

Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?

A
more gas particles more collisions higher pressure
Option A
B
smaller volume crowded particles less collisions lower pressure
Option B
C
smaller volume crowded particles more collisions higher pressure
Option C
D
more gas particles more kinetic energy more volume higher pressure
Option D
15

What is the relationship between a mole and Avogadro’s number?

A
A mole is the mass of Avogadro’s number of particles of a substance.
B
A mole is the amount of a compound that has Avogadro’s number of carbon-12 atoms in it.
C
A mole contains Avogadro’s number of particles of a substance.
D
A mole is the amount of any substance that has the same mass as Avogadro’s number of carbon-12 atoms.
16

A chemical equation can be used to solve stoichiometry problems provided that it

A
indicates only the forward reaction and not the reverse.
B
indicates that reactants are in the gas phase and are not solids or liquids.
C
includes the coefficients that are needed for balancing the equation.
D
includes the state of matter after each substance.
17

What is the electron configuration of chlorine (Cl)?

A
1s22s22p63s23p3
B
1s22s22p63s23p5
C
1s22s22p63s24s23p3
D
1s22s22p63s23p23d3
18

Who reported four “element” classifications, but included some substances that were combinations of elements rather than true elements in his listing?

A
Henry Moseley
B
Dmitri Mendeleev
C
Antoine Lavoisier
D
Johann Dobereiner
19

The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. According to the ideal gas law, what will most likely happen to the pressure?

A
It will double.
B
It will decrease.
C
It will increase slightly.
D
It will remain the same.
20

Which commercial technology commonly uses plasmas?

A
a radio
B
a race car
C
a fluorescent light
D
a microwave oven

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