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Test Review- Chemistry Final

Total questions: 84

Worksheet time: 2hrs 1mins

Name
Class
Date
1.

When balancing chemical equations, you CANNOT change the___

a)

element

b)

compound

c)

coefficient

d)

subscript

2.

In the equation 2H2 + O2 --> 2H2O the coefficient of the oxygen (O) reactant is

a)

0

b)

1

c)

2

d)

3

3.

What are the products of the following equation?

N2 + 3H2 --> 2NH3

a)

N2

b)

3H2

c)

2NH3

d)

N2 + 3H2

4.

According to the Law of Conservation of Matter

a)

you can create or destroy matter

b)

you cannot create or destroy matter

c)

matter does not exist

5.

In a chemical equation, how should the mass of the reactants compare to the mass of the products?

a)

The reactants will have a higher mass than the products

b)

The products will have a higher mass than the reactants

c)

The reactants will not have any mass

d)

The mass of the reactants will be the same as the mass of the products

6.

Which of the following is a physical change?

a)

breaking a bone

b)

rust forming on a nail

c)

stomach digesting food

d)

cooking pancakes

7.

In the following equation, what are the reactants?

CH4 + 4Cl2 --> CCL4 + 4HCl

a)

CH4 + 4Cl2

b)

CCl4 + 4HCl

c)

CH4

d)

CCl4

8.

In the following equation, what is the subscript for chlorine on the reactant side?

CH4 + 4Cl2 --> CCl4 + 4HCl

a)

4

b)

2

c)

1

9.

In the following equation, how many total elements are present on the product side?

CH4 + 4Cl2 --> CCl4 + 4HCl

a)

4 total elements

b)

7 total elements

c)

6 total elements

d)

3 total elements

10.

In the following equation, how many total atoms are on the product side?

CH4 + 4Cl2 --> CCl4 + 4HCl

a)

10

b)

13

c)

16

11.

Which of the following is NOT an indicator of a chemical reaction?

a)

evolution of gas

b)

condensation

c)

evolution of heat

d)

precipitate

12.

In lab, two clear liquids are mixed together and a bright yellow, solid substance forms from the solution. Which best describes what happened?

a)

a physical change occurred and a new yellow solution was formed

b)

a chemical change occurred and a new yellow solution was formed

c)

a physical change occurred and a yellow precipitate formed

d)

a chemical change occurred and a yellow precipitate formed

13.

Which of the following is an example of a chemical change?

a)

a sugar cube is crushed

b)

salt dissolves in water

c)

kool-aid freezes

d)

vinegar and baking soda mixed together and forms a gas

14.

Of the following equations, which one is balanced?

a)

2Fe + 3O2 --> Fe2O3

b)

2Na + O2 --> 2NaO

c)

Na + 2HCl --> H2 + 2NaCl

15.

Balance the following equation:

Al + O2 --> Al2O3

a)

2Al + O2 --> Al2O3

b)

Al2 + O3 --> Al2O3

c)

2Al + 3O2 --> Al2O3

d)

4Al + 3O2 --> 2Al2O3

16.

How is the Law of Conservation of Matter shown in a chemical reaction?

a)

The number of atoms in the reactants and the number of atoms in the product have no relationship

b)

The number of atoms in the reactants is equal to the number of atoms in the products

c)

The number of atoms in the products is greater than the number of atoms in the reactants

d)

The number of atoms in the reactants is greater than the number of atoms in the product

17.

During lab, a chemical change occurred and a solid substance was formed in a beaker where two liquids were mixed. What is that solid substance called?

a)

a solute

b)

a solvent

c)

a solution

d)

a precipitate

18.

Which number tells how many molecules are in a chemical formula?

a)

subscript

b)

coefficient

19.

Which number tells how many individual atoms are in a chemical formula

a)

subscript

b)

coefficient

20.
If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
a)
12 atoms of carbon (C)
b)
6 atoms of carbon (C)
c)
3 atoms of carbon (C)
d)
2 atoms of carbon (C)
21.
Which best explains why the total mass of the products might appear to be less than the total mass of the reactants after a chemical reaction?
a)
A physical change occurred.
b)
Atoms involved in the reaction lost mass.
c)
Precipitates were created in the new solution.
d)
Gases were released to the atmosphere.
22.
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
a)
During a chemical reaction, the total amount of matter stays the same.
b)
During a chemical reaction, matter is destroyed.
c)
During a chemical reaction, one or more new substances are formed.
d)
During a chemical reaction, the total number of atoms increases.
23.
What coefficient is needed for O2 so that this equation demonstrates the law of conservation of mass?
   
CH4+ __O2 → CO2 + 2H2O
a)
1
b)
2
c)
3
d)
4
24.
What is the importance of a closed container in a chemical reaction?
a)
to observe the mass before and after the reaction occurs without interference from outside materials
b)
to increase the pressure during the reaction
c)
to observe the loss of mass after the reaction occurs
d)
to observe the increase in mass after the reaction occurs
25.
When iron combines with oxygen in a moist environment, rust forms because of a 
a)
chemical reaction
b)
physical reaction
c)
change in density 
d)
change in temperature
26.
Some power plants produce energy by burning coal.  In these power plants, the heat from burning coal is used to boil water.  Which statement best describes the changes that occur when burning coal and boiling water?
a)
Burning coal and boiling water are both physical changes
b)
Burning coal and boiling water are both chemical changes 
c)
Burning coal is a chemical change and boiling of water is a physical change
d)
Burning coal is physical change and boiling water is a chemical change
27.
Which is indicated if a gas forms when two or more substances are mixed?
a)
physical change
b)
chemical change 
c)
physical property
d)
chemical property
28.
Which is a physical change?
a)
a piece of wood burning
b)
a copper roof changing color
c)
rust forming on an iron fence
d)
a sheet of paper shredding
29.

Which is the best description of table salt (NaCl)?

a)

atom

b)

compound

c)

element

30.
Which chemical formula is an example of a compound?
a)
O2
b)
2Cl
c)
H2SO4
31.
Which substance is composed of only one type of atom?
a)
element
b)
mixture
c)
solution
32.
How many elements are in one molecule of glucose (C6H12O6 )?
a)
1
b)
3
c)
6
33.

________ is a substance that is produced during a chemical reaction

a)

Substance

b)

equation

c)

Chemical equation

d)

Product

34.

Which of the following does this picture represent?

a)

Element

b)

Compound

c)

Mixture of elements & compounds

d)

Mixture of compounds

35.

Which of the following does this picture represent?

a)

Element

b)

Compound

c)

Mixture of elements & compounds

d)

Mixture of compounds

36.

Which one of the following illustrations shows a molecule that is NOT a compound?

a)

b)

c)

d)

37.

A solution of hydrochloric acid (HCl) in an open container is placed on a balance. Magnesium (Mg) metal is added to the acid and the mass is recorded.

The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected (see picture).

Based on this data, which of the following is most likely occurring?

a)

The hydrochloric acid and magnesium metal react to form a gas that is less dense than the surrounding air.

b)

The hydrochloric acid and magnesium metal react and some of the atoms are destroyed, which decreases the overall mass.

c)

The hydrochloric acid and magnesium metal react to form a precipitate

d)

The hydrochloric acid and magnesium metal are not reacting with each other

38.

In this picture: Atoms are represented by circles Molecules are represented by circles that are connected to each other. Different colored circles represent different types of atoms (different elements).

Which of the pictures could represent a chemical reaction?

a)

A

b)

B

c)

C

d)

D

39.

What does it mean for a chemical equation to "support the law of conservation of matter"?

a)

The chemical equation has reactants and products.

b)

The equation includes coefficients that show the same number of atoms of each type before and after a reaction

c)

The equation shows the transfer of energy as a substance is heated or cooled

d)

The equation demonstrates no change in the substances after the reaction occurs

40.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

41.

How many grams of OXYGEN would be needed to show conservation of mass in the example below?

a)

100 g

b)

93 g

c)

7 g

d)

0 g

42.

Look at the pictures above. A shows the bag before the vinegar and baking soda are mixed together, and B shows it after they are mixed together. In which picture do the contents of the bag have the greater mass?

a)

The mass is greater in A—before they are mixed.

b)

The mass is greater in B—after they are mixed.

c)

The mass is the same in both.

d)

The mass depends on the temperature.

43.

Is it possible for these reactants to become this product?

a)

No, because no new types of atoms were made

b)

No, because none of the atoms were destroyed

c)

Yes, because the type and number of atoms are the same, just rearranged differently

d)

Yes, because new types of atoms were created

44.
a)
Periods
b)
Groups
45.
a)
energy levels
b)
valence electrons
c)
protons
d)
neutrons
46.
a)
Group 1
b)
Group 17
c)
Group 2
d)
Group 18
47.
a)
Group 1
b)
Group 17
c)
Group 18
d)
Group 2
48.
a)
Metals
b)
Nonmetals
c)
Metalloids
49.
a)
Metals
b)
Nonmetals
c)
Metalloids
50.

What subatomic particle is found in the nucleus and is neutral?

a)

proton

b)

neutron

c)

electron

51.

What subatomic particle is negative and found outside the nucleus?

a)

proton

b)

neutron

c)

electron

52.

Every element has an unique number of _______________.

a)

protons

b)

neutrons

c)

electrons

d)

symbols

53.

What subatomic particle is positive and found in the nucleus?

a)

electron

b)

proton

c)

neutron

d)

quark

54.

The atomic number of an element increases from left to right across the periodic table.

a)

True

b)

False

55.

What is the atomic mass of Calcium (Ca)?

a)

40.08

b)

20

56.

How many protons does Potassium (K) have?

a)

39

b)

19

c)

20

d)

39.10

57.

Hydrogen and Helium have similar physical and chemical properties.

a)

True

b)

False

58.

The chemical properties of an element are determined by the number of

a)

energy levels

b)

valance electrons

c)

isotopes

d)

ions

59.

The identity of an element on the periodic table is determined by the number of _______.

a)

protons

b)

neutrons

c)

electrons

d)

ions

60.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

61.

How many neutrons does platinum have?

a)

78

b)

117

c)

195

d)

196

62.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
63.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
64.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
65.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
66.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
67.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles - 
a)
could show that a gas is forming
b)
always rise to the top of a liquid. 
c)
are almost always perfectly spherical.
d)
usually burst after a few minutes.
68.
Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?
a)
Experiment 1
b)
Experiment 2
c)
Experiment 3
d)
Experiment 4
69.
Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?
a)
The mass of the solution remains the same.
b)
 Phase changes are observed.
c)
 The color of the solution remains clear.
d)
The temperature of the solution increases. 
70.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
71.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
72.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
73.
Coloured water is an example of a
a)
homogeneous mixture
b)
heterogeneous mixture
74.
Soil is an example of a
a)
homogeneous mixture
b)
heterogeneous mixture
75.
Making a mixture results in ___________________ only.
a)
chemical reactions
b)
separate parts
c)
physical changes
d)
two subtances
76.
This is a mixture of two or more substances in which one or more of these substances (solutes) is dissolved in another substance.
a)
COMPOUND
b)
MOLECULE
c)
SOLUTION
d)
SOLVENT
77.

How would you separate a mixture of sand and salt?

a)

Mix them with water and let the water evaporate

b)

Mix them with water, pour the mixture through a screen, then let the water evaporate

c)

Heat the sand and salt mixture for 5 minutes, then let it cool

d)

I would not do any of these because none of these options would work

78.

This picture represents which of the following?

a)

element

b)

compound

79.
Which compound has the most atoms?
a)
H2O
b)
O2
c)
C3H6O3
d)
NaCl
80.
A pure substance that contains two or more elements that are chemically bonded is:
a)
an atom
b)
a compound
c)
an ionic bond
d)
organic
81.
Groups (also known as Families) on the periodic table have similar:
a)
properties
b)
formulas
c)
atomic numbers
d)
atomic masses
82.
The properties of a compound are:
a)
the same as the elements that make up the compound
b)
reactive
c)
complicated
d)
different than the elements that make up the compound
83.
The Atomic Mass (or Atomic Weight) is the same as the number of:
a)
electrons
b)
neutrons
c)
protons and electrons
d)
protons and neutrons
84.
The Atomic Number is the same as the number of:
a)
protons
b)
electrons
c)
protons and neutrons
d)
electron shells

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