AnswersFL-2003350-Chemistry 1 HonorsCumulative Exam

Cumulative Exam — Cumulative exam Answers

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1
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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
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Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?

A
oxygen + lithium oxide lithium
Option A
B
lithium + oxygen lithium oxide
Option B
C
oxygen + lithium lithium + oxide
Option C
D
lithium oxide lithium + oxygen
Option D
3

If a compound has a molar mass of 180 g/mol and its empirical formula is CH2O, what is its molecular formula?

A
CH2O
B
C2H4O2
C
C6H12O6
D
C12H22O11
4

What would a chemist most likely study about a car?

A
The amount of rotations of the wheel that occur in 1 mile.
B
The reaction of gasoline combustion in the engine.
C
The accuracy of the speedometer.
D
The strength of the car frame.
5

Which element has an ion that is smaller than an ion of calcium?

A
potassium
B
strontium
C
cesium
D
magnesium
6

Which physical method can separate a mixture of steel ball bearings and marbles?

A
boiling
B
evaporation
C
filtration
D
sorting
7

Which is a property of covalent compounds?

A
They ionize in solution.
B
They tend to be very hard.
C
They have a low boiling point.
D
They have a high melting point.
8

Rachel is performing an acid-base titration. She hopes to determine the concentration of an unknown acid solution to two decimal places. Which is the best tool to find the volume of the base that she needs to neutralize the acid?

A
beaker
B
Erlenmeyer flask
C
graduated cylinder
D
buret
9

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
10

Quarks are thought to be the building blocks of protons. Which was most affected by the discovery of the quark?

A
the estimated mass of a proton
B
the observation that protons have a +1 charge
C
the view that the atom cannot be broken down further than protons
D
the theory that the nucleus of an atom contains protons and neutrons
11

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.
12

Which of the following do Lewis structures help us understand?

A
the exact structure of a molecule
B
the number of electrons that are involved in the bonding of the molecule
C
the total number of electrons in a molecule
D
how electrons attract other electrons in a molecule
13

Which of the following observations would indicate that a material is a pure substance?

A
It does not dissolve in water.
B
It changes color after heating.
C
It cannot be physically broken down into different types of atoms.
D
It can be physically broken down into different types of molecules.
14

Consider the reaction.At 298 K, the equilibrium concentration of O2 is 1.6 x 10-2 M, and the equilibrium concentration of O3 is 2.86 x 10-28 M. What is the equilibrium constant of the reaction at this temperature?

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
15

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.
16

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
17

Which is a postulate of the kinetic-molecular theory?

A
Gas particles have a small volume relative to the spaces between them.
B
Gas particles have a large volume relative to the spaces between them.
C
Gas particles are very small in size and always move slowly.
D
Gas particles are very large in size and always move slowly.
18

How does an increase in reactant concentration affect the rate of reaction?

A
It leads to more frequent collisions, which increase reaction rate.
B
It leads to less frequent collisions, which increase reaction rate.
C
It leads to more frequent collisions, which decrease reaction rate.
D
It leads to less frequent collisions, which decrease reaction rate.
19

Consider the temperature versus time graph below.At what temperature is the substance a heated gas?

Question illustration
A
at 100°C
B
below 0°C
C
above 100°C
D
between 0°C and 100°C
20

Based on its location in the periodic table, what can most likely be predicted about sulfur?

A
It has four valence electrons available for bonding.
B
It has four nonbonding electrons.
C
It has six valence electrons available for bonding.
D
It has six nonbonding electrons.

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