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Question 1

Determine whether the statement is true or false.
The picture chemical reaction is balanced:

it shows 1N2 +3H2 = 2NH3

True
False

Question 2
An isotope of the element nitrogen has 7 protons and 9 neutrons. What is the name of the isotope?

a
Nitrogen-7
b
Nitrogen-16
c
Nitrogen-14
d
Nitrogen-9

Question 3
If a dolphin swims at 1.85 m/s, how far will the dolphin have traveled after 6.0 s?

a
11 m
b
3.2 m
c
9.0 m
d
31 m
Question 4
An object moves a distance of 10 meters in 5 seconds. What is the average speed of the object?

a
2.0 m/s
b
50 m/s
c
40 m/s
d
0.5 m/s
Question 5
In what group and period does Barium (Ba) belong?

a
Group 2, Period 6
b
Group 6, Period 2
c
Grroup 137, Period 56
d
Group 56, Period 137
Question 6
What kind of nuclear reaction does the picture show?



a
Nuclear Fission
b
Nuclear Fusion
Question 7
Look at the following equation.

Fe + Cl2 → FeCl3

In order to follow the law of conservation of mass, this equation must have which set of coefficients, in order from left to right?

Blank 1:
Blank 2:
Blank 3:
Question 8
What would happen if a scuba tank (a rigid, sealed gas cylinder) heats up?

a
The size of the gas particles in the tank would increase.
b
The number of particles in the tank would increase.
c
The density of the gas in the tank would increase.
d
The pressure exerted by the gas in the tank would increase.
Question 9
For each description, decide if it is describing an acid or a base.

Column A
1.
Tastes sour.:
Tastes sour.
2.
Tastes bitter:
Tastes bitter
3.
H2SO4

:
H2SO4

4.
LiOH:
LiOH
5.
pH above 7:
pH above 7
6.
pH below 7:
pH below 7
Column B
a.Acid
b.Base
Question 10
What two subatomic particles have the greatest mass?

a
neutrons and electrons
b
protons and neutrons
c
protons and electrons
Question 11
A chemist is trying to get two substances to react, but he is unsuccessful. He knows that the two substances should react with one another. Which of the following could he do to possibly get the substances to react? (Select all that apply)

a
heat the substances
b
decrease the concentration of one of the substances
c
increase the concentration of one of the substances
d
crush up one of the substances
e
cool the substances

1 answer

Here are the answers to your questions:

Question 1
The statement is true. The chemical reaction 1N2 + 3H2 = 2NH3 is balanced because there are the same number of each type of atom on both sides of the equation.
Answer: True

Question 2
The isotope of nitrogen with 7 protons and 9 neutrons has a mass number of 16 (7 protons + 9 neutrons = 16). This isotope is referred to as Nitrogen-16.
Answer: b - Nitrogen-16

Question 3
If the dolphin swims at 1.85 m/s for 6.0 seconds, the distance traveled can be calculated using the formula: distance = speed × time. Therefore, distance = 1.85 m/s × 6.0 s = 11.1 m. The closest answer listed is 11 m.
Answer: a - 11 m

Question 4
To find the average speed, you can use the formula: average speed = distance / time. So, average speed = 10 meters / 5 seconds = 2.0 m/s.
Answer: a - 2.0 m/s

Question 5
Barium (Ba) belongs to Group 2 and Period 6 of the periodic table.
Answer: a - Group 2, Period 6

Question 6
Assuming the picture depicts a reaction involving the combining of light nuclei to form a heavier nucleus, it indicates nuclear fusion.
Answer: b - Nuclear Fusion

Question 7
To balance the equation Fe + Cl2 → FeCl3, you need 2 Fe and 3 Cl2. Therefore, the coefficients should be: 2, 3, 2.
Answer: 1: 2, 2: 3, 3: 2

Question 8
If a scuba tank heats up, the pressure exerted by the gas in the tank would increase due to the kinetic energy increase of gas particles.
Answer: d - The pressure exerted by the gas in the tank would increase.

Question 9

    1. Tastes sour - a. Acid
    1. Tastes bitter - b. Base
    1. H2SO4 - a. Acid
    1. LiOH - b. Base
    1. pH above 7 - b. Base
    1. pH below 7 - a. Acid

Answer:

  1. a - Acid
  2. b - Base
  3. a - Acid
  4. b - Base
  5. b - Base
  6. a - Acid

Question 10
The two subatomic particles with the greatest mass are protons and neutrons.
Answer: b - protons and neutrons

Question 11
To possibly get the substances to react, the chemist could:

  • a. heat the substances
  • c. increase the concentration of one of the substances
  • d. crush up one of the substances

Answer: a, c, d