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Chemistry Semester 2 Exam 2024

Last updated over 1 year ago
41 questions
Answer each question to the best of your ability. There is only one correct answer to each. Use the following charts to help you along your way. You may also use a calculator.



1

Use the diagram to answer the following question.

How many bonds are made by each carbon atom in the molecule shown above?

1

Two elements in a molecule have the same electronegativity values. Which of the following most likely holds the elements together and why?

10

Categorize the following items as being either endothermic or exothermic.

  • combustion
  • Bond Formation
  • melting of water
  • condensation of water
  • Bonds Breaking
  • solution feels hot
  • photosynthesis
  • solution feels cold
  • Endothermic
  • Exothermic
8

Match the element to the correct number of valence electrons

Draggable itemCorresponding Item
Ca (Calcium)
8
Fr (Francium)
2
S (Sulfur)
5
As (Arsenic)
1
C (Carbon)
6
I (Iodine)
4
Kr (Kypton)
7
1

In the molecule below, which atom has the largest partial negative charge __________?

3
As you move to the right in the Periodic Table, electronegativity __________ and as you go down the columns, it __________. Column __________ is not included in the trend for electronegativity because these elements don't usually form bonds.
4
When sodium (Na) forms an ion, it __________ an electron and has a __________ charge. It does this in order to achieve __________ valence electron(s) and form a(n) __________ bond.
5
Balance the following equation, and identify its type.
______ AgNO3(aq) + ______ Cu(s) --> ______ Cu(NO3)2(aq) + ______ Ag(s)
It is a(n) _______________________ reaction.
Other Answer Choices:
2
decomposition
combustion
double replacement
single replacement
0
synthesis
3
1
3
The balanced equation for the decomposition of sodium azide is:
______ NaN3 --> ______ Na + ______ N2
Other Answer Choices:
2
0
1
3
6
In the following equations, use Le Chatelier's Principle to determine whether the reaction will shift right, left, or no shift.
N2(g) + 3H2(g) ⇌ 2NH3(g) + heat
Stress Shift .
add N2 __________
remove H2 __________
increase temperature __________
decrease pressure __________
add a catalyst __________
remove NH3 __________
2

Show how to calculate how many moles of carbon dioxide there are when you have 52.06 g of carbon dioxide (CO2), and choose the correct answer. (Choose 2 selections from below)

2
The combustion of propane (C3H8) produces CO2 and H2O according to the following balanced reaction:
C3H8 (g) + 5O2 (g) --> 3CO2 (g) + 4H2O (g)
Given 2.5 mol propane, how many moles of CO2 will be produced?
2.5 mol = ___________________________ = ________________
Other Answer Choices:
3 mol CO2 / 1 mol C3H8
0.83 mol CO2
1 mol C3H8 / 3 mol CO2
32 g C3H8 / 1 mol C3H8
1 mol C3H8 / 32 g C3H8
7.5 mol CO2
1
Determine how the following actions will affect reaction rate by choosing the correct response.
a. Platinum is used in catalytic converters in cars to convert toxic gases to carbon dioxide and water. If much less platinum is used to make the catalytic converter, the conversion of the gases would__________
b. Magnesium metal is reacted with hot water in two beakers to produce magnesium hydroxide and hydrogen gas. Beaker 1 had a one-inch strip of magnesium and beaker 2 has a one-inch strip cut into tiny pieces. The rate of reaction in beaker 2 is __________ beaker 1.
c. An experiment is carried out at 40oC and 70oC. The experiment carried out at 70oC occurs faster. This is because __________
1

Which reaction diagram shows the effect of using the appropriate catalyst in a chemical reaction?

1

In a sealed bottle that is half full of water, equilibrium will be reached when water molecules

1

1

In the chemical reaction shown below, all of the HCl and Zn will react to form H2 and ZnCl2
Which of the following statements describes the result of this reaction?

1

When a steel block at 100oC is placed on top of a copper block at 20oC, the thermal energy of the copper begins to increase. Which of the following is the source of this increase in energy?

1

A popcorn kernel is up to 13% water. The drawing above shows a kernel of corn that is heated until it pops. Which of the following best explains what happens to the liquid water stored inside the kernel that leads to the popping process?

1

The diagram shown represents a closed energy system. The system contains equal masses of air, copper, and water in a perfectly insulated container. The temperatures were taken at the time the materials were placed in the closed system.

How will the temperatures of the materials change over an extended period of time?

6

Select which type of bond is being formed in the following substances.

Ionic
Covalent
Both Ionic and Covalent
AlCl3
Iron (II) Oxide
NO2
H2SO4
CaCO3
C2H5OH
6

Correctly answer the questions about the heating curve below. There are 5 columns to categorize. You need to scroll over to see them all.

AB
BC
CD
DE
EF
Boiling point
Gas
Solid
Liquid
mixture of solid and liquid
1500 oC
2500 oC
1

Which of the following objects transfers its energy primarily by radiation?

1

Which of the following is the best example of heat transfer by convection?

1

Which of the following has the lowest average molecular kinetic energy?

1

According the the kinetic molecular theory of gases, the particles of a gas have

1

A 0.500-mole sample of a gas has a volume of 11.2 liters at 273 K. What is the pressure of the gas?

1

A gas has a pressure of 300 torr, a temperature of 400 K, and a volume of 50.0 milliliters. What volume will the gas have at a pressure of 150 torr and a temperature of 200 K?

1

A gas at STP (standard pressure and temperature) has a volume of 1.0 liter. If the pressure is doubled and the temperature remains constant, the new volume of the gas will be

1

Which substance is a good conductor of electricity in both the solids and liquid phases?

1

A chemist performs the same tests on two homogeneous white crystalline solids, A and B. The results are shown in the accompanying table.

The results of these test suggest that

1

Which kind of energy is stored in a chemical bond?

1

Given the reaction:
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
Where solid zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen gas, the reaction occurs more slowly when a single piece of solid zinc is used instead of the same mass of powdered zinc. Why is this the case?


1

Given the above reaction, what is the ratio of moles of H2 consumed to moles of NH3 produced?

1

Given the balanced equation:
NaOH + HCl --> NaCl + H2O
What is the total number of grams of H2O produced when 115 grams of the product, NaCl, is formed?

1

What is the total mass of oxygen in 1.00 mole of Al2(CrO4)3?

1

Which factor is a major cause of global warming?

1

An increase in which gas would cause the most greenhouse warming of Earth's atmosphere?

1

Global Warming has been linked to a decrease in the

1

The specific heat of wood is about 1,700 J/kgoC. How much energy is required in joules to heat a 12 kg piece of wood from 20oC to 30oC?

1

If a 500.0-g block of metal absorbs 5,016 J of heat when its temperature changes from 20.00oC to 45.00oC, what is its specific heat?