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Chemistry

Total questions: 152

Worksheet time: 13hrs 40mins

Name
Class
Date
1.

An electron is

a)

positively charged

b)

neutral

c)

negatively charged

2.

atomic number is

a)

the number of protons

b)

the number of electrons

c)

the number of neutrons

d)

the location of an atom on the periodic table

3.

Atomic Mass is the number of

a)

protons and neutrons in the nucleus of an atom

b)

protons and electrons in the nucleus of an atom

c)

neutrons and electrons in the nucleus of an atom

4.

Conservation of mass means

a)

all the atoms present before a chemical reaction are not present after

b)

atoms present before chemical reactions are present after

c)

new substances and new elements are formed in a chemical reaction

5.

An elements is

a)

a substance that cannot be split into simpler substances

b)

a substance that can be split into simpler substances

6.

A pure substance that is a compound is made out of

a)

particles of more than one type of atom

b)

particles of the same type of atom

c)

a mixture of two or more substances that can be physically separated

7.

A molecule is

a)

a singular particle of a particular element

b)

another name for an element

c)

2 or more atoms that are combined

8.

which of the statements on physical changes are correct

a)

A physical change cannot be reversed

b)

A physical change is a change in state

c)

A physical change is a change in form

d)

A physical change is where new substances are formed

9.

Signs of a chemical change include;

a)

change of colour, change of temperature, precipitate (solid) formed, gas released.

b)

change of colour, reversing back to original form, precipitate (solid) formed, gas released.

10.

Characteristics of metals on the periodic table are

a)

they are not able to be oxidised

b)

they are poor conductors of heat and electricity

c)

have free electrons

11.

Water is the product of the reactants:

a)

oxygen and water

b)

oxygen and carbon

c)

hydrogen and oxygen

12.

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants

are broken, and

a)

atoms rearrange and form new bonds to make the products.

b)

atoms remain the same and do not form new bonds to make the proudcts

13.

The type of reaction that releases energy as heat is called

a)

endothermic

b)

exothermic

c)

respiration

d)

photosynthesis

14.

if an acid is diluted it

a)

has a large amount of water mixed into it

b)

has a small amount of water mixed into it

c)

is very 'acidus' sour

d)

is corrosive and cannot be eaten

15.

When an acid reacts with a metal following is the product

a)

salt + hydrogen

b)

salt + carbon dioxide + water

16.

bases are the same as an acid

a)

true

b)

false

17.

Bases that dissolve in water are called

a)

caustic

b)

alkalis

c)

reactants

d)

products

18.

A Ph scale of7/8 is

a)

acidic

b)

neutral

c)

basic

19.

To neutralise an acid you add a

a)

acid

b)

base

c)

Ph indicator

d)

equal amount of water

20.

The 'conservation of mass' theory tells us when a chemical reaction occurs in a closed system

a)

there will be no change in mass

b)

there will be a change in mass as it cannot be directly weighed and may dissipate

21.
What charge will a Beryllium ion have?
a)
+
b)
2+
c)
2-
d)
-
22.
The smallest unit of matter that retains the properties of that matter is
a)
a molecule
b)
a compound
c)
a mixture
d)
an atom
23.
Which of the following changes is a physical change of matter?
a)
water evaporating
b)
paper burning
c)
a nail rusting
d)
a silver spoon tarnishing
24.
Which of the following changes is a chemical change of matter?
a)
ice melting to produce water
b)
vinegar combining with baking soda to produce carbon dioxide
c)
water boiling to produce water vapor
d)
liquid silica solidifying to form glass
25.
Which of the following is an example of a heterogeneous mixture?
a)
tap water
b)
chunky peanut butter
c)
orange-colored sugar water
d)
gold ring
26.
Which of the following is a pure substance?
a)
air
b)
granite
c)
water
d)
stainless steel
27.
The horizontal rows of the periodic table are called
a)
periods
b)
columns
c)
groups
d)
families
28.
Which of these recorded observations is qualitative, rather than quantitative?
a)
A chemical reaction is complete in 2.3 s.
b)
The solid has a mass of 23.4 g.
c)
The compound melts at 87.5C.
d)
Iron is denser than aluminum.
29.
The horizontal rows of the periodic table are called
a)
periods
b)
columns
c)
groups
d)
families
30.
Theories are considered successful only if they
a)
can be used to make accurate predictions.
b)
can be stated in simple terms.
c)
can be written in the form of an equation.
d)
have been accepted by all scientists. 
31.
The SI base units for time and temperature are
a)
hour and degree Celsius.
b)
second and degree Celsius.
c)
hour and kelvin.
d)
second and kelvin.
32.
Which of these shows SI unit prefixes arranged in order from smallest to largest?
a)
centi, milli, kilo
b)
milli, centi, kilo
c)
kilo, milli, centi
d)
kilo, centi, milli
33.
A sample of bismuth has a mass of 343 g and a volume of 35.0 cm3.What is the density of bismuth?
a)
0.102 g/cm3
b)
9.80 g/cm3
c)
378 g/cm3
d)
1.20 104 g/cm3
34.
An object’s weight is a measure of 
a)
the force with which it is attracted by gravity.
b)
the pressure exerted on a scale.
c)
the amount of material per unit volume.
d)
the force causing the object to move.
35.
The SI base unit for mass is the
a)
gram
b)
cubic centimeter
c)
meter
d)
kilogram
36.
The number of significant figures in the measurement 170.040 km is
a)
Three
b)
Four
c)
Five
d)
Six
37.
The dimensions of rectangular solid are measured to be 2.0 cm, 3.0 cm, and 4.0 cm. The volume should be recorded as
a)
24 cm3.
b)
12 cm3.
c)
9 cm3.
d)
6 cm3.
38.
Expressed in scientific notation, 0.0930 m is
a)
93  X  10-3 m
b)
9.3  X 10-3 m.
c)
9.30 X  10-2 m.
d)
9.30 X 10-4 m.
39.
When 2.02 X 1023 is multiplied by 3.1 X 10-31, the product is
a)
6.3 X 10-8
b)
6.3 X 108
c)
6.3 X 1054
d)
6.3 X 10-54
40.
anions are _____ ions.
a)
positive
b)
negative
c)
neutral
41.
In the atom diagram shown, E is pointing to
a)
An electron
b)
a proton
c)
a neutron
d)
the nucleus
42.
Which of the following is described as the basic unit of matter?
a)
Element
b)
Atom
c)
Molecule
d)
Compound
43.

In the atom diagram shown, A is pointing to the darker particles, these are known as

a)

electrons

b)

protons

c)

neutrons

d)

the nucleus

44.
B and C are found in the ______ of an atom.
a)
electron cloud
b)
Space
c)
Nucleus
d)
Outside
45.
What charge does an electron have?
a)
Negative
b)
Positive
c)
Neutral
d)
Contrated
46.
Which of the following is found in the nucleus of an atom?
a)
electrons
b)
neutrons
c)
The center of an atom, composed of protons and neutrons
d)
molecules
47.

In this chemical equation, the elements in red are the_______.

a)

Products

b)

Reactants

c)

Subscripts

d)

Coefficients

48.

What is the atomic mass of this atom?

a)

1

b)

3

c)

4

d)

7

49.
What is the atomic number of this atom?
a)
4
b)
5
c)
9
d)
none of the above
50.
What is a valence electron?
a)
an electron that is found in the outermost orbital of an atom. 
b)
an electron found in the innermost orbital of an atom.
c)
an electron found in the middle orbital.
51.

An ionic bond forms when

a)

valence electrons are shared back and forth (move between) two atoms.

b)

a sea of mobile electrons surround the cations and they then become negativly charged

c)

valence electrons are transferred from one atom to another, forming charged ions that are then pulled together by attraction between opposite charges

d)

none of the above

52.

Covalent bonds form when

a)

the electronegativity difference between two atoms is very large.

b)

electrons are completely transferred between two atoms.

c)

pairs of electrons are shared between two atoms.

d)

ions are held together by opposite charges.

53.
Why type of bond is forming between the atoms in the diagram?
a)
Ionic
b)
Covalent
54.
Is this image an example of covalent bonding?
a)
Yes
b)
No
55.

Using the information provided, determine how many electrons the a Boron atom contains.

a)

2.5

b)

5

c)

6

d)

10.81

56.
What type of bond is forming between oxygen and hydrogen?
a)
Ionic 
b)
Covalent
57.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
58.

What is the smallest 'building block' of the elements that make up the universe?

a)

An atom

b)

An electron

c)

A proton

d)

A cell

59.

Which subatomic part of an atom gives it a positive charge?

a)

Neutron

b)

Proton

c)

Electron

d)

Nucleus

60.

An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?

a)

0

b)

7

c)

6

d)

13

61.

A certain atom of oxygen contains 8 protons, 8 neutrons, & 8 electrons. Another atom of unknown identity contains 9 protons. Which of the following MUST be true about this unidentified atom?

a)

It has 9 neutrons in its nucleus.

b)

It is an isotope of oxygen.

c)

Its atomic mass is a decimal number.

d)

It cannot be an atom of oxygen.

62.

An atom of neon has 8 valence electrons. What will an atom of neon MOST likely do to be stable?

a)

Gain 1 electron

b)

Lose 2 electrons

c)

Lose 8 electrons

d)

Neither gain nor lose any valence electrons

63.

What type of bond is formed when atoms share electrons?

a)

Covalent

b)

Ionic

c)

Hydrogen

d)

Polyatomic

64.

How are ionic and covalent bonds alike?

a)

They both form organic molecules.

b)

They both fill outer electron shells.

c)

They both transfer electrons from one atom to another.

d)

They both transfer protons from one atom to another.

65.

A substance with a pH of 8 is a

a)

acid

b)

base

c)

neutral

66.

Carbon has 4 valence electrons which means

a)

it can only form bonds with carbon

b)

it is stable

c)

it can make ionic bonds

d)

it wants to make 4 covalent bonds

67.

This reaction is showing energy being _____________

a)

Absorbed

b)

Released

c)

There is no change in energy shown

68.

The electrons in the outermost energy level are called

a)

valence

b)

ions

c)

covalent

d)

farthest out

69.

Activation energy is

a)

The energy to start a car

b)

The energy needed to break down CO2

c)

The energy needed to start a reaction

d)

The energy used to digest food

70.

Acids have more ______ ions than bases

a)

OH-

b)

H-

c)

OH+

d)

H+

71.

If salt is dissolved in water, water is the ____________

a)

Solution

b)

Solute

c)

Solvent

d)

Suspension

72.

An example of a carbohydrate would be

a)

meat

b)

milk

c)

eggs

d)

bread

73.

The image shows the periodic grid for SODIUM. What is Sodium's atomic mass?

a)

11

b)

12

c)

23

d)

Impossible to tell

74.

Which of the following would be considered most acidic?

a)

1

b)

3

c)

7

d)

13

75.

What element will have the most similar physical and chemical properties to the element Sulfur (S)?

(click on the periodic table to expand it!)

a)

Carbon (C)

b)

Phosphorous (P)

c)

Oxygen (O)

d)

Neon (Ne

76.
What two elements make up water?
a)
Helium and oxygen
b)
Hydrogen and oxygen
c)
helium and carbon
d)
oxygen and carbon
77.

A substance that changes the rate of a chemical reaction without being used up in the reaction is called a ________________.

a)

bond

b)

catalyst

c)

acid

d)

ion

78.

What element does the chemical symbol Sn stand for

a)

Antimony

b)

Seaborgium

c)

Strontium

d)

Tin

79.

What element has the chemical symbol Ca?

a)

Calcium

b)

Carbon

c)

Caesium

d)

Californium

80.

What element has the chemical symbol Ca?

a)

Calcium

b)

Carbon

c)

Caesium

d)

Californium

81.

What element has the chemical symbol Au?

a)

Silver

b)

Lead

c)

Gold

d)

Actinium

82.
What is lithium's chemical symbol?
a)
L
b)
Li
c)
Th
d)
Lm
83.

What element has the chemical symbol N?

a)

nitrogen

b)

nobelium

c)

sodium

d)

nitrate

84.
What is the chemical symbol for mercury?
a)
Hg
b)
Mc
c)
My
d)
C
85.

What element has the chemical symbol P?

a)

phosphorus

b)

potassium

c)

phosphate

d)

potash

86.

What element has the chemical symbol As

a)

Argon

b)

Astatine

c)

Arsenic

d)

Antimony

87.

What is the chemical symbol for Boron?

a)

Bn

b)

Bo

c)

Br

d)

B

88.

What is the chemical symbol for copper?

a)

Cp

b)

Co

c)

Cu

d)

C

89.

What element has the chemical symbol Po?

a)

Plutonium

b)

Promethium

c)

Protactinium

d)

Polonium

90.

What is the chemical symbol for Aluminium?

a)

Al

b)

A

c)

Am

d)

Au

91.

What letter of the alphabet does not appear in any chemical symbols?

a)

Z

b)

J

c)

L

d)

X

92.

What is the chemical symbol for Sodium?

a)

S

b)

Na

c)

So

d)

Sd

93.

Who first developed the periodic table?

a)

Newton

b)

Einstein

c)

Mendeleev

d)

Rutherfor

94.

Which element had the original name 'plumbum"?

a)

Lead

b)

Platinium

c)

Plutonium

d)

Uranium

95.

How many of the 118 elements are naturally occurring?

a)

60

b)

All 118

c)

92

d)

102

96.

Which of the following is NOT a noble gas?

a)

Helium

b)

Xenon

c)

Oxygen

d)

Neon

97.
Anything that takes up space and has mass is known as _______________.
a)
Matter
b)
Molecules
c)
Compounds
d)
Stuff
98.
What are the building blocks of MATTER?
a)
Atoms
b)
Cells
c)
Protons
d)
Neutrons
99.
What are the building blocks of MATTER?
a)
Atoms
b)
Cells
c)
Protons
d)
Neutrons
100.
The nucleus of an atom is made up of...
a)
Protons and Neutrons
b)
Neutrons and Electrons
c)
Protons and Electrons
101.
The image shows the periodic grid for POTASSIUM. What is Potassium's atomic number?
a)
19
b)
39
c)
20
d)
Impossible to tell
102.
A(n) ____________________ is a pure substance made of a single type of atom and cannot be broken down.
a)
Element
b)
Compound
c)
Molecule
d)
Mixture
103.
has the same composition throughout and does not vary from sample to sample
a)
pure substance
b)
compound
c)
solvent
d)
solution
104.
substance that dissolves
a)
solvent
b)
solution
c)
solute
d)
unsaturated
105.
contains less solute than a saturated solution
a)
unsaturated solution
b)
saturated solution
c)
supersaturated solution
106.
contains the maximum amount of dissolved solute
a)
unsaturated solution
b)
supersaturated solution
c)
saturated solution
107.
ionic compound that produces positive hydrogen ions when dissolved in water
a)
acid
b)
base
108.
mixture in which the composition is not uniform throughout
a)
homogeneous mixture
b)
heterogeneous mixture
109.
amount of solute that can dissolve in a given amount of solvent at a given temperature
a)
saturated solution
b)
solubility
c)
pure substance
d)
colloid
110.
substance that dissolves the solute
a)
solution
b)
solvent
c)
saturation
111.
substance consisting of atoms or ions of two or more different elements joined by a chemical bond
a)
element
b)
mixture
c)
compound
112.
mixture of two or more substances; dissolved particles are spread evenly throughout the mixture
a)
solvent
b)
solute
c)
mixture
d)
solution
113.

How many molecules are in this formula?

a)

1

b)

2

c)

3

d)

6

114.

What is the atomic mass for this element?

a)

6

b)

12.0107

c)

6.0107

d)

18.0107

115.

What is the property of water is shown in the picture?

a)

specific heat

b)

universal solvent

c)

capillary action

d)

surface tension

116.

The center of an atom is called

a/an __________.

a)

atomic mass

b)

nucleus

c)

proton center

d)

energy shell

117.

What property of water is shown in the picture?

a)

surface tension

b)

capillary action

c)

universal solvent

d)

specific heat

118.

What property of water is shown in the picture?

a)

surface tension

b)

capillary action

c)

universal solvent

d)

specific heat

119.
Define Reactants
a)
the building block of matter
b)
a description of a reaction
c)
the substances produced in a reaction
d)
the starting substances in a chemical reaction
120.
Which is a sign of a chemical reaction?
a)
chemical properties change
b)
a gas forms
c)
a solid forms
d)
physical properties change
121.
Explain why subscripts cannot change when balancing a chemical equation
a)
Gives the amount of atoms
b)
You can change subscripts
c)
The identity of a substance changes
d)
None of the above
122.
Define products
a)
The substance produced in a chemical reaction
b)
Another word for ions
c)
A description of a reaction
d)
Process in which atoms bond together
123.
Which of these are signs that a chemical reaction has occurred?
a)
Change in color 
b)
Release of light
c)
Change in odor
d)
All are correct
124.
What is a chemical reaction?
a)
produces or yields
b)
an attraction between atoms
c)
a process in which one or more substances rearrange to form a new one
d)
state that the identity stays the same before and after 
125.
Atoms separate, rearrange, and new bonds form in a chemical reaction
a)
FALSE
b)
TRUE
126.
A chemical equation is a description of a reaction using symbols
a)
TRUE
b)
FALSE
127.
What is a coefficient?
a)
Number of protons of that substance in a reaction
b)
Number of electrons of that substance in the reaction
c)
Number of units of that substance in the reaction
d)
Number of metallic bonds
128.
The arrow in a chemical equation separates two or more reactants 
a)
FALSE
b)
TRUE
129.
How many hydrogen atoms are in 2 molecules of water (2H2O)?
a)
2
b)
3
c)
10
d)
4
130.
The law of conservation of mass states that the total mass of  the reactants and the products before and after in a chemical reaction will not be the same
a)
TRUE
b)
FALSE
131.
Which of these is NOT a step in balancing a chemical equation
a)
Add or change subscripts
b)
Add coefficients 
c)
Write the unbalanced equation 
d)
Count atoms of each element in the reactants and in the products
132.
A physical change produces new substances
a)
FALSE 
b)
TRUE
133.
What is the correct form to balance this equation:
H2 + O2 --> H2O
a)
4H2 + O2 --> H2O
b)
2H2 + O2 --> 2H2O
c)
2H2 + 2O2 --> 4H2O
d)
5H2 + 2O2 --> 10H2O
134.

Is Silicon a metal, nonmetal, or metalloid?

a)

Metal

b)

Nonmetal

c)

Metalliod

135.
What is the relative formula mass of CO2?
a)
44
b)
32
c)
16
d)
56
136.
What is the unit for molar mass?
a)
no unit
b)
g
c)
g mol-1
137.
What is the formula for iron(III) oxide?
a)
FeO
b)
Fe3O
c)
Fe3O2
d)
Fe2O3
138.
Calculate the number of gold atoms in a 4 mole sample of gold.
a)
2.41x1024
b)
3.01x1023
c)
4.82x1024
d)
6.02x1023
139.
Calculate the number of moles of Aluminum in a 2.04 mole sample of aluminum oxide, Al2O3.
a)
2.04 moles
b)
4.08 moles
c)
6.12 moles
d)
1.02 moles
140.
Calculate the mass of oxygen present in a 55g sample of Aluminum oxide, Al2O3.
a)
29.28
b)
19.95
c)
11.36
d)
32.33
141.
Calculate the % composition by mass of oxygen present in H2SO4.
a)
16.3%
b)
65.25%
c)
32.6%
d)
57.14%
142.
What is the empirical formula of a compound if the molecular formula is W18O9?
a)
W18O9
b)
W2O
c)
W6O3
d)
none of the above
143.
Which represents the greatest mass of sulfur?
a)
1 gram of sulfur
b)
1 molecule of sulfur
c)
0.5 mole of sulfur
d)
6.02 x 1023 atoms of sulfur
144.
What is the mass of one mole of aluminum?
a)
27 g
b)
13 g
c)
54 g
d)
14 g
145.
What is the molar mass of CO2?
a)
12
b)
16
c)
32
d)
44
146.
What is the mass percentage of Carbon in carbon dioxide (CO2)?
a)
27.3%
b)
42.9%
c)
57.1%
d)
72.7%
147.
Formula mass of KBr
a)
119
b)
117g
c)
54
d)
62g
148.
Moles of Al2O3 in 40g
a)
40%
b)
0.39
c)
4080
d)
2.55
149.
How much CO2 could you make from 6g of C?
C + O2 --> CO2
a)
12g
b)
44g
c)
22g
d)
32g
150.
Mass of one mole of Mg(OH)2
a)
58g
b)
42g
c)
82g
d)
41g
151.
Formula mass of HF
a)
20g
b)
10g
c)
11
d)
20
152.
Formula mass of CaCO3
a)
100
b)
100g
c)
50
d)
50g

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