wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Unit 2 review

Total questions: 100

Worksheet time: 2hrs 30mins

Name
Class
Date
1.

What type of bond involves the sharing of electrons between atoms?

a)

covalent bond

b)

ionic bond

c)

metallic bond

d)

transfer bond

2.
Why do bonds form?
a)
To fill the valence shell of electrons for the elements involved
b)
to release energy stored in the bonds
c)
because whenever you mix two chemicals, there will be a reaction
d)
because of attraction
3.
What type of bond occurs between a positive and a negative ion?
a)
Ionic bond
b)
covalent bond
c)
metallic bond
d)
p-n bond
4.

Water, H2O

a)

Ionic

b)

Covalent

c)

Metallic

5.
The number at the top of each square on the periodic table is the ...
a)
atomic number
b)
atomic mass
c)
Chemical Symbol
d)
Element Name
6.

What is the CHEMICAL FORMULA for the molecular model pictured above?

a)

CH

b)

C4H

c)

CH4

7.
What does an atomic number tell you about an atom?
a)
Number of Protons in an atom or ion
b)
Number of Neutrons in an atom or ion
c)
Number of Nuclei in an atom or ion
d)
Number of fingers on a hand
8.

In an ionic bond, electrons are

a)

lost or gained

b)

shared

c)

either shared or gained

d)

neither, they float in a cloud

9.

When an atom loses an electron, it becomes a

a)

positive ion

b)

negative ion

c)

neutral ion

d)

neutral atom

10.

Water drops usually have a small speck of dust inside of them for water to stick to. What property of water allows it to form drops?

a)

Cohesion

b)

Adhesion

c)

High Specific Heat

d)

High Heat of Vaporization

e)

Less Dense as a Solid

11.
 Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?
a)
The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together
b)
The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet
c)
The insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surface
d)
The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
12.
Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
13.
The fact that ice floats on liquid water is due to the fact that water's solid is ___________ than it's liquid form
a)
less polar
b)
more polar
c)
less dense
d)
more dense
14.
Which term refers to water having partial positive and a partial negative charge?
a)
cohesion
b)
surface tension
c)
polarity
d)
adhesion
15.

Capillary Action

a)

The property of water that allows ice to float on the surface of liquid water

b)

The property of water that allows it to dissolve polar substances

c)

When water molecules stick to other surfaces

d)

The property of water that allows water to move up a thin tube (or the stem of a plant) by itself

16.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
17.
Which solution releases H+ in solution?
a)
Base
b)
Acid
c)
Buffer
d)
Water
18.
This substance releases OH- into solution
a)
Acid
b)
Base
c)
Neutral
19.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
20.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
21.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
22.
Proteins are made of monomers called ___________
a)
Nucleotides
b)
Monosaccharides
c)
Amino Acids
d)
Glycerol and fatty acids
23.
The element _______is found in all of the organic compounds.
a)
Iron
b)
Nitrogen
c)
Carbon
d)
Oxygen
24.
DNA and RNA are examples of 
a)
Carbohydrates
b)
Lipids
c)
Proteins
d)
Nucleic Acids
25.
Which macromolecule is made of simple and complex sugars?
a)
lipids
b)
proteins
c)
carbohydrates
d)
nucleic acids
26.
Which macromolecule stores energy, insulates us, and makes up the cell membrane?
a)
lipids
b)
proteins
c)
carbohydrates
d)
nucleic acids
27.
This is one job proteins do NOT have in the body
a)
storing genetic information
b)
structure
c)
speed up chemical reactions
d)
transport things through cell membrane
28.
DNA and RNA are examples of...
a)
proteins
b)
nucleic acids
c)
carbohydrates
d)
lipids
29.
Unsatured fats are healthier for you. Which is an example of an unsaturated fat?
a)
butter
b)
bacon
c)
olive oil
d)
eggs
30.
Another name for fats and oils
a)
proteins
b)
sugar
c)
lipids
d)
nucleic acids
31.
The word saccharide means:
a)
sugar
b)
glucose
c)
sweetener
d)
carbohydrate
32.

How how carbohydrates and lipids similar?

a)

both contain C, H, O, N, P and store energy

b)

both contain C, H, O, N and give energy

c)

both contain C, H, O, N, S and store energy

d)

both contain C, H, O and give energy

33.

What is the key role (function) of carbohydrates?

a)

energy storage

b)

immunity, muscles, structure for tissues, cell metabolism

c)

instant energy for cells and body functions

d)

genetic information (heredity)

34.

What elements (monomers) make up a protein?

a)

C, H, O

b)

C, H, O, N, (S)

c)

C, H, O, N, P

35.
Which biomolecule is found in pasta and bread?
a)
Lipid
b)
Protein
c)
Nucleic Acid
d)
Carbohydrate
36.
Which biomolecule is found in fats, oils, and waxes and is a source of long-term energy? 
a)
Proteins
b)
Nucleic Acid
c)
Lipids
d)
Carbohydrate
37.
What is the function of a nucleic acid?
a)
Stores genetic information
b)
Stores energy
c)
Quick source of energy
d)
Builds structures
38.

Which macromolecule is shown?

a)

lipid

b)

protein

c)

nucleic acid

d)

carbohydrate

39.
How many sugar units make up polysaccharides?
a)
one
b)
two
c)
more than two
d)
zero
40.
Enzymes are..
a)
nucleic acids 
b)
carbohydrates 
c)
lipids 
d)
proteins 
41.
Building blocks of the body, hair , muscles etc.
a)
protein
b)
nucleic acid
c)
lipids
d)
carbohydrates
42.
All polymers are made up of...
a)
monosaccharides
b)
monomers
c)
proteins
d)
None of these
43.
Lipids can be digested into what smaller subunits?
a)
nucleic acids
b)
amino acids
c)
fatty acids
d)
glucose
44.
All polymers are made up of...
a)
monosaccharides
b)
monomers
c)
proteins
d)
None of these
45.

What is the key role (function) of carbohydrates?

a)

energy storage

b)

immunity, muscles, structure for tissues, cell metabolism

c)

instant energy for cells and body functions

d)

genetic information (heredity)

46.

What elements (monomers) make up nucleic acids?

a)

C, H, O

b)

C, H, O, N, (S)

c)

C, H, O, N, P

47.

Identify the lipid:

a)
b)
c)
d)
48.

Identify the nucleic acid:

a)
b)
c)
d)
49.

The monomer for a protein is:

a)

amino acid

b)

fatty acid

c)

monosaccharide

d)

nucleotide

50.

The image shows the periodic grid of potassium. How many electrons are found in the potassium atom?

a)

19

b)

20

c)

39

d)

40

51.

What charge does an atom have when it GAINS electrons?

a)

Positive

b)

Negative

c)

Neutral

52.

What subatomic particle changes in an ion?

a)

The number of electrons

b)

The number of protons

c)

The number of neutrons

53.
Sodium has an atomic number of 11, how many protons does this atom have?
a)
22
b)
11
c)
12
d)
2
54.

Where is the proton located?

a)

In the very dense nucleus

b)

Floating around in the negative electron cloud

c)

In the loose nucleus

d)

In the positive electron cloud

55.
The following element key shows how many protons?
a)
16
b)
15.999
c)
Oxygen
d)
8
56.
Which two particles make up the nucleus of an atom?
a)
Protons and Electrons
b)
Protons and Neutrons
c)
Molecules and Compounds
d)
Neutrons and Electrons
57.

Which statement correctly describes an electron in an atom?

a)

Electrons stay inside the nucleus and carry a neutral charge.

b)

Electrons circle the nucleus and have a positive charge.

c)

Electrons move around the nucleus and have a negative charge.

d)

Electrons stay inside the nucleus and have a negative charge.

58.
The smallest unit of matter is called?
a)
An electron
b)
An element
c)
An atom
d)
A solid
59.
The atomic number is equal to _.
a)
the number of protons and electrons
b)
the number of neutrons only
c)
the total number of protons and neutrons
d)
the number of protons neutrons and electrons
60.

An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?

a)

30

b)

26

c)

56

d)

82

61.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
62.
A chemical bond formed when 2 atoms share electrons
a)
ionic bond
b)
covalent bond
c)
ionic compound
d)
soap
63.
Small positively charged particles that are found in the nucleus of an atom
a)
neutron
b)
ion
c)
proton
d)
electron
64.
A small particle in the nucleus of the atom with no electrical charge
a)
ion
b)
proton
c)
neutron
d)
electron
65.
Ionic Bonding involves...
a)
The transfer of protons
b)
The transfer of nuetrons 
c)
The transfer of electrons
d)
None Of the above
66.

What is the picture displayed?

a)

atom

b)

element

c)

compound

67.

What are the building blocks of matter?

a)

Atoms

b)

Protons

c)

Cells

d)

Neutrons

68.

What is a cation?

a)

A chemical compound without ions

b)

An ion with a negative charge

c)

An ion with a positive charge

d)

An atom without an electric charge

69.

What is an anion?

a)

An ion with a negative charge

b)

A chemical compound

c)

An atom without charge

d)

An ion with a positive charge

70.

What is the relationship between valence electrons and the formation of ions?

a)

The formation of ions depends on the number of protons in the nucleus, not on the valence electrons.

b)

Valence electrons have no relationship with the formation of ions.

c)

Valence electrons only affect the electrical conductivity of an atom, not the formation of ions.

d)

Valence electrons determine an atom's ability to form ions.

71.

How many valence electrons does a sodium atom have?

a)

3

b)

1

c)

2

d)

0

72.

Neutrons are

a)

negative

b)

neutral

c)

positive

d)

cows

73.

Electrons are...

a)

negative and in the nucleus

b)

not in an atom

c)

positive and at the edge of the atom

d)

negative and at the edge of the atom

74.

Most of the atom is filled with...

a)

electrons

b)

the nucleus

c)

empty space

d)

protons

75.

Which of the following is not a compound?

a)

HCl

b)

NaCl

c)

Cl

d)

CO2

76.

How many protons are in this element?

a)

47

b)

117

c)

107.87

77.

Carbon dioxide is a compound.

a)

TRUE

b)

FALSE

78.

Hydrogen is a compound.

a)

TRUE

b)

FALSE

79.
The energy needed to start a chemical reaction
a)
Catalyst
b)
Activation Energy
c)
Substrates
d)
Reactants
80.
Look at this reaction graph. Which of the following is NOT true of this reaction?
a)
The reactants have lower energy than the product
b)
This is showing an endothermic reaction
c)
Activation energy was not needed for this to occur
d)
The product has more energy than the reactants
81.

Which of the following statements is TRUE of enzymes?.

a)

Enzymes are not found in living organisms

b)

Enzymes help to speed up chemical reactions

c)

Enzymes are made carbohydrates

d)

Enzymes increase the activation energy of a chemical reaction

82.
Enzymes help chemical reactions happen by _______ activation energy.
a)
increasing
b)
decreasing
c)

requiring

83.
In this diagram A is the
a)
substrate
b)
enzyme
c)
enzyme-substrate complex
d)
product
84.

Enzymes are also considered to be biological ____________

a)

catalysts

b)

organisms

c)

life

d)

denatures

85.
The substance(s) that enter an enzyme and are either joined or broken apart
a)
Reactants
b)
Products
c)
Substrates
d)
Denatures
86.
The area of an enzyme where the substrate binds to the enzyme
a)
Product
b)
Active Site
c)
Catalyst
d)
Complex
87.
In living things many enzymes are ________
a)
carbohydrates
b)
nucleic acids
c)
lipids
d)
proteins
88.
In this diagram B is the
a)
substrate
b)
active site
c)
enzyme-substrate complex
d)
product
89.
Most enzymes end in......?
a)
-ose
b)
-itin
c)
-ase
d)
-ome
90.
Which molecules in this reaction are the products?
a)

CH4 and O2

b)
H2O and O2
c)
CO2 and H20
d)
CH4 and H20
91.
Which molecules in this reaction are the reactants?
a)

CH4 and O2

b)
H2O and O2
c)
CO2 and H20
d)
CH4 and H20
92.

What term is used to describe the process of an enzyme changing shape due to extreme heat or pH levels?

a)
depolarize
b)

catalyze

c)
polymerize
d)
denature
93.
Reactants in an enzyme catalyzed reaction are called the
a)
substrate
b)
organics
c)
products
d)
polymers
94.
A reaction in which energy is absorbed is called
a)
endothermic
b)
exothermic
c)
introverted
d)
exceptionally thermic
95.
A reaction where energy is RELEASED to the environment
a)
Exothermic
b)
Endothermic
c)
Polythermic
d)
Batman
96.
Which of the following is true of the below reaction?
a)
There is one reactant and two products involved
b)
This is an exothermic reaction
c)
This is comparing the reaction rate with an enzyme vs without an enzyme
d)
Energy is absorbed by this reaction
97.
Which of the following accurately describes this graph?
a)
Green reaction has an enzme so less energy is used than the purple reaction
b)
This reaction is endothermic and absorbing energy from its surroundings.
c)
The activation energy is the same for both the purple and green reactions.
d)
Different products are produced in the green reaction and purple reaction.
98.

Which of the following applies to endothermic reactions?

a)

They feel cold and absorb energy

b)

They feel hot and absorb energy

c)

They feel hot and release energy

d)

They feel cold and release energy

99.

Which of the following applies to exothermic reactions?

a)

They feel cold and absorb energy

b)

They feel hot and absorb energy

c)

They feel hot and release energy

d)

They feel cold and release energy

100.

Which of the following statements does NOT apply to the Toothpickase lab activity?

a)

Toothpickase was represented by hands

b)

The substrates in the lab were toothpicks

c)

The products in the lab were the busted toothpicks

d)

The reaction of breaking toothpicks was slower when we increased enzyme concentration

Similar Resources on Wayground

Cells

100 questions

Cells

quiz

Worksheet

•

9th - 11th Grade

Cat 1-4 Practice

100 questions

Cat 1-4 Practice

quiz

Worksheet

•

KG - University

Biology AIR test review

105 questions

Biology AIR test review

quiz

Worksheet

•

9th - 12th Grade

Biology 2nd semester review 1

100 questions

Biology 2nd semester review 1

quiz

Worksheet

•

9th Grade

BODY SYSTEMS

95 questions

BODY SYSTEMS

quiz

Worksheet

•

KG - University

A&P Fall Semester Exam Review

100 questions

A&P Fall Semester Exam Review

quiz

Worksheet

•

9th - 12th Grade

Bio SOL Review Extra Credit

100 questions

Bio SOL Review Extra Credit

quiz

Worksheet

•

KG - University