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Junior Science Chemistry

Total questions: 180

Worksheet time: 4hrs 39mins

Name
Class
Date
1.
Dalton’s atomic theory says that all atoms of one element are the same. 
a)
True
b)
False
2.

What is the center of the atom called?

(a)  

3.

Which subatomic particle has no charge (neutral)?

(a)  

4.

What particles are atoms made of? (Check ALL that apply:)

a)

Protons

b)

Neutrons

c)

Electrons

d)

Nucleus

5.

What particles are in the nucleus?

a)

Protons

b)

Neutrons

c)

Electrons

d)

Nucleus

6.

All matter is made of what?

a)

energy

b)

atoms

c)

electrons

7.

The positive particles of an atom are ___________.

a)

electrons

b)

protons

c)

neutrons

8.

Which is the correct definition for an element?

a)

A substance made up of only one type of atom that can be broken down

b)

Two or more substances that are not chemically combined

c)

Two or more different atoms that are chemically combined

d)

A substance made up of only one type of atom that cannot be broken down

9.

The smallest part of an element is called...

a)

a compound

b)

a mixture

c)

an element

d)

an atom

10.

Which two of these are elements?

a)

Water (H2O)

b)

Hydrogen (H2)

c)

Salt 🧂 (NaCl)

d)

Iron (Fe)

e)

Carbon dioxide (CO2)

11.

The periodic table is organized in horizontal rows called...

a)

Groups

b)

Families

c)

Periods

d)

Chemical Symbols

12.
What is the chemical symbol for the element hydrogen
a)
H
b)
He
c)
h
d)
he
13.
What is the chemical symbol for the element hydrogen
a)
H
b)
He
c)
h
d)
he
14.
What is the chemical symbol for the element Silicon
a)
S
b)
Si
c)
si
d)
Sl
15.
What is the chemical symbol for the element Carbon
a)
ca
b)
co2
c)
C
d)
Cd
16.
What is the chemical symbol for the element copper?
a)
co
b)
c
c)
Cu
d)
cu
17.
What is the chemical symbol for the element Aluminum
a)
A
b)
AL
c)
Al
d)
al
18.
What is the chemical symbol for the element Nitrogen
a)
Ni
b)
N
c)
No
d)
Nb
19.
What is the chemical symbol for the element oxygen
a)
O
b)
Oxy
c)
ox
d)
Oy
20.
What is the chemical symbol for the element Silver
a)
S
b)
Si
c)
Au
d)
Ag
21.
What is the chemical symbol for the element Chlorine
a)
C
b)
Cl
c)
cl
d)
Ch
22.
What is the chemical symbol for the element Gold
a)
G
b)
go
c)
AU
d)
Au
23.
What element is represented by the Chemical symbol Mg
a)
Manganese
b)
Magnesium
c)
Molybdenum
d)
Mitrium
24.
What is the chemical symbol for the element Iron
a)
I
b)
Ir
c)
Fe
d)
fe
25.
What is the chemical symbol for the element Zinc
a)
Z
b)
Zn
c)
Zr
d)
zn
26.
What is the chemical symbol for the element Helium
a)
He
b)
he
c)
H
d)
h
27.
What is the chemical symbol for the element Calcium
a)
C
b)
Ca
c)
Cl
d)
CL
28.
What is the chemical symbol for the element Potassium
a)
K
b)
P
c)
Po
d)
Pt
29.
What is the chemical symbol for the element Phosphorus
a)
p
b)
P
c)
Ph
d)
Ps
30.
What is the chemical symbol for the element Sodium
a)
Na
b)
So
c)
S
d)
Sd
31.
What is the chemical symbol for the element Iodine
a)
I
b)
Io
c)
Id
d)
In
32.
What is the chemical symbol for the element Fluorine
a)
F
b)
Fl
c)
Flu
d)
f
33.

What is the chemical symbol for Hydrogen

a)

H

b)

He

c)

Hy

d)

Hg

34.

H2 is an example of a(n)...

a)

Element

b)

Compound

c)

Molecule

d)

Heterogeneous Mixture

35.

The columns on the Periodic Table are known as..

a)

periods

b)

rows

c)

groups

d)

periodics

36.

Metals are found on the _________ hand side of the periodic table

a)

centre

b)

right

c)

left

d)

top right

37.

The columns on the Periodic Table are known as..

a)

periods

b)

rows

c)

groups

d)

periodics

38.

the rows on the periodic table are called..

a)

groups

b)

periods

c)

columns

d)

periodics

39.

Metals are found on the _________ hand side of the periodic table

a)

centre

b)

right

c)

left

d)

top right

40.

The elements in the middle of the periodic table are known as the __________ metals

a)

reactive

b)

unreactive

c)

transition

d)

vigorous

41.

Group 1 elements are also known as ________

a)

The noble gases

b)

The Halogens

c)

The Alkali metals

d)

The transition metals

42.

Which Group 1 element is the most reactive out of these..

a)

lithium

b)

sodium

c)

potassium

43.

When a metal reacts with water, what gas is produced?

a)

oxygen

b)

carbon dioxide

c)

hydrogen

d)

nitrogen

44.

Group 7 elements are also known as the_________

a)

Noble gases

b)

Halogens

c)

Transition metals

d)

Alkali metals

45.

In Group 7, reactivity __________ as you go down the group

a)

increases

b)

decreases

c)

stays the same

46.

Why does a displacement reaction occur?

a)

when a metal is more reactive than the metal in the compound

b)

when a metal is less reactive than the metal in the compound

c)

when a metal bonds to oxygen

d)

when a metal reacts with water

47.

When two or more elements bond together a _______ is formed...

a)

atom

b)

molecule

c)

compound

d)

carbonate

48.

Group 0 elements are also known as the____________

a)

Halogens

b)

Alkali metals

c)

Noble gases

d)

Transition metals

49.

Magnesium + oxygen --> ______________

a)

magnesium carbonate

b)

magnesium dioxide

c)

magnesium oxide

d)

magnesium iodide

50.

Sodium + iodine -----> _______________

a)

sodium iodine

b)

sodium iodide

c)

sodium oxide

d)

sodium carbonate

51.

Lithium + water ------> lithium __________ + ____________

a)

oxide + oxygen

b)

hydroxide + hydrogen

c)

hydroxide + carbon dioxide

d)

hydroxide + oxygen

52.

Which two of these words are properties of a metal?

a)

sonorous

b)

dull

c)

shiny

d)

poor conductor of electricity

53.

What Group is oxygen in on the periodic table

a)

1

b)

3

c)

6

d)

7

54.

Which group is magnesium in on the periodic table?

a)

1

b)

2

c)

3

d)

4

55.

How many chlorine atoms are present in MgCl2

a)

1

b)

2

c)

3

d)

4

56.

What is the name of the compound that has a formula of MgCl2

a)

Magnesium chlorine

b)

Manganese chlorine

c)

Manganese chloride

d)

Magnesium chloride

57.

What is true of molecules of gas that are exposed to heat in a fixed volume container?

a)

They move faster and they cause the pressure to increase

b)

They move slower and pressure will decrease

c)

The volume increases and pressure increases

d)

The volume decreases and the pressure decreases.

58.

6.15: Which of these is not a property of noble gases?

a)

Colourless

b)

Odourless

c)

Flammable

d)

Gas at room temperature

59.
Which of these is not a noble gas?
a)
Helium
b)
Argon
c)
Nitrogen
d)
Krypton
60.
True or false: Noble gases react with water
a)
True
b)
False
61.
Where are the nonmetals located on the periodic table?
a)
top left corner
b)
bottom left corner
c)
top right corner
d)
bottom left corner
62.
The blue atoms are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
63.
Which noble gas is found in signs or light displays?
a)
Krypton
b)
Helium
c)
Argon
d)
Neon
64.
a)
Alkali
b)
Alkaline
c)
Halogen
d)
Noble Gases
65.

All of these elements are metal solid elements except ...............

a)

sodium

b)

magnesium

c)

mercury

d)

aluminium

66.

All of the following are metals except .............

a)

iron

b)

oxygen

c)

copper

d)

sodium

67.

Oxygen is a form of ...........................

a)

acids

b)

bases

c)

metals

d)

nonmetals

68.

A lithium atom (Li) changes into a lithium ion (Li+), which mean that it .........................

a)

gains one proton

b)

gains one electron

c)

loses one proton

d)

loses one electron

69.

What did Dmitri invent?

a)

book

b)

Periodic Table

c)

Russian currency

d)

Calculator

70.

How are the elements arranged on the periodic table today?

a)

By atomic mass

b)

By number of electrons

c)

By atomic number

d)

By alphabetic order

71.

What is the periodic law?

a)

Elements have numbers

b)

Elements have specific names

c)

Elements are organized based on families

d)

Elements are organized based on atomic masses

72.

Book Mendeleev wrote in 1867

a)

Principals in Chemistry

b)

Principles in Chemistry

c)

Principles of Chemistry

d)

Organic Chemistry

73.

What nationality was Dmitri Mendeleev?

a)

Russian

b)

Jamaican

c)

German

d)

Scottish

74.

What elements listed below are halogens?

a)

Bromine

b)

Carbon

c)

Nitrogen

d)

Iodine

75.

What is more reactive?

a)

Iodine

b)

Fluorine

76.
When an object changes shape when struck by a hammer.
a)
luster
b)
malleable
c)
brittleness
d)
ductile
77.
The list which contains only metals is .......
a)
aluminium, copper, nitrogen
b)
iron, oxygen, hydrogen
c)
iron, silver, aluminium
d)
iron, sulphur, copper
78.

What Group is being studied and what are they called?

a)

Group 1 Alkali Metals

b)

Group 2 Alkaline Earth Metals

c)

Group 7 Metalloids

d)

Group 4 Transition Elements

79.

Which of the following is not a member of the alkaline earth metals, Group 2?

a)

Beryillium

b)

Magnesium

c)

Hydrogen

d)

Calcium

80.

How many electrons are found in the outer shell of an alkaline earth metal?

a)

1

b)

2

c)

3

d)

4

81.

What happens to the reactivity of the alkaline earth metals as you move down their group?

a)

Increases

b)

decreases

c)

stays the same

82.

What happens to the boiling and melting points of the alkaline earth metals as you move down the group?

a)

Increase

b)

decrease

c)

remains the same

83.

What is the appearance of magnesium? But what happens to it when you expose it to air?

a)

it is dull and it becomes shiny when exposed to air

b)

it melts at room temperature and resolidifies when exposed to air

c)

it turns into a vapor and gives off a red light when exposed to air

d)

it is shiny but becomes oxidized and dulls when exposed to air

84.

As you move down the group what happens to the elements in terms of their hardness?

a)

increases

b)

decreases

c)

stay the same

85.

When you put Calcium in water, what molecule forms?

a)

Calcium hydrate

b)

calcium hydroxide

c)

calcium precipitate

d)

magnesium oxide

86.

Which are the Alkaline earth metals?

a)

calcium, magnesium, Beryrillium, Strontium, Barium, Radium

b)

Lithium, Sodium Potassium, Ribidium, Cesium, Francium

c)

Nitrogen, Phosphorous, Arsenic, Bismuth

d)

Helium, Neon, Argon, Krypton, Rado, Xenon

87.

Which are more reactive than the alkaline earth metals?

a)

inert gases

b)

Transition metals

c)

Metalloids

d)

alkali metals

88.

Which metal is NOT an Alkaline Earth Metal?

a)

Calcium

b)

Radon

c)

Strontium

d)

Radium

89.

Where are valence electrons found?

a)

In the first energy level of the electron cloud

b)

In the nucleus

c)

In the outermost energy level in the electron cloud

90.

Which is the most reactive metal in this group?

a)

Sodium

b)

Potassium

c)

Rubidium

d)

Francium

91.

a)

Ms

b)

Ma

c)

Mn

d)

Mg

92.

Which of the following is not a member of the alkaline earth metals, Group 2?

a)

Beryillium

b)

Magnesium

c)

Hydrogen

d)

Calcium

93.
Alkali metals are found in which group of the periodic table?
a)
Group 1
b)
Group 2
c)
Group 7
d)
group 8 
94.
Which of the following is the most reactive in water?
a)
Lithium
b)
Sodium
c)
Potassium
95.
Which of the following is NOT an alkali metal
a)
Li
b)
Cl
c)
K
d)
Cs
96.
Which is the lightest alkali metal?
a)
Aluminium
b)
Hydrogen
c)
Lithium
d)
Potassium
97.

Which of these statements about alkali metals is NOT true as you go down the group?

a)

The number of electrons in the outer shell increases.

b)

The outer electron is more easily lost.

c)

The outer electron becomes further from the nucleus.

d)

The size of the atoms increases.

98.
a)

Halogens

b)

Transition Metals

c)

Alkali-Earth Metals

d)

Alkali Metals

99.

a)

Transition Metals

b)

Noble Gases

c)

Alkali Metals

d)

Alkali-Earth Metals

100.

a)

Alkali Metals

b)

Post-Transition Metals

c)

Lanthanides

d)

Halogens

101.

a)

Halogens

b)

Metals

c)

Metalloids

d)

Noble Gases

102.

a)

Metals

b)

Metalloids

c)

Non-Metals

d)

Transition Metals

103.

a)

Alkali-Earth Metals

b)

Metals

c)

Metalloids

d)

Non-Metals

104.

a)

Non-Metals

b)

Halogens

c)

Other-Non~Metals

d)

Lanthanides

105.

Where was Marie Curie born?

a)

Paris, France

b)

London, UK

c)

Warsaw, Poland

d)

Prague, Check Republic

106.

Marie Curie was investigating a uranium-rich mineral (pitchblende) and isolated a sample that was 400 as active as uranium, a new element, that she called...

a)

radium

b)

polonium

c)

francium

d)

rutherfordium

107.

The element which was 900 more radioactive than uranium Marie called...

a)

polonium

b)

francium

c)

germanium

d)

radium

108.
What is uranium
a)
Metal
b)
Chemical element
c)
Chain reaction
d)
Rock
109.

What is uranium’s atomic number

a)

29

b)

76

c)

92

d)

69

110.
What is the test for Oxygen gas?
a)
Litmus paper
b)
Glowing splint
c)
"Pop" sound
d)
Red flame
111.

The hydrogen peroxide is decomposed in the presence of manganese dioxide into .......

a)

water and hydrogen

b)

water and oxygen

c)

oxygen and hydrogen

112.

Oxygen is collected by the .........

a)

downward displacement of water

b)

upward displacement of water

c)

No correct answer

113.

Which is the best way to get salt from salty water?

a)

Evaporation

b)

Filtration

c)

Distillation

114.

When a mixture of rock pieces, salt, and water is filtered, what is the residue?

a)

Rock Pieces

b)

Salt

c)

Water

d)

Salt and Water

115.

Ions are formed when atoms...

a)

lose or gain electrons

b)

lose electrons

c)

gain electrons

d)

gain neutrons

116.
Water (H2O) freezing is an example of:
a)
A chemical change
b)
A physical change
117.
What does the element AI stand for ?
a)
Gold
b)
Actinium
c)
Iron
d)
Aluminum
118.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
119.

An element that is a very reactive gas is most likely a member of the...

a)

noble gases

b)

alkali metals

c)

halogens

d)

actinides

120.
Which of the following metals is most reactive?
a)
Sodium (Na)
b)
calcium (Ca)
c)
titanium (Ti)
d)
All metals have the same reactivity
121.
Why is hydrogen placed above Group 1 in the periodic table?
a)
Like Group 1 metals, hydrogen is a metal soft enough to be cut with a knife.
b)
Like atoms of Group 1 metals, hydrogen atoms have only one electron in their outer level.
c)
Hydrogen has the same atomic mass as Group 1 metals.
d)
Hydrogen has the same density as Group 1 metals.
122.

Valence electrons are...

a)

the total number of electrons in an atom

b)

the number of electrons on the first energy shell of an atom

c)

the number of electrons on the outermost energy shell of an atom

123.

The majority of the periodic table is made up of

a)

Metals

b)

Nonmetals

c)

Metalloids

d)

Noble gases

124.

Name the ionic compound, LiCl

a)

lithium chlorine

b)

lithium chloride

c)

lithium chlorate

d)

lithium monochloride

125.

Name the molecular compound CO

a)

carbon monoxide

b)

monocarbon monoxide

c)

carbide

d)

oxygen carbide

126.
H2SO4 - name?
a)
hydrogen sulfide
b)
hydrosulfuric acid
c)
hydrogen sulfide
d)
sulfuric acid
127.
H20 - name?
a)
hydrooxic acid
b)
hydroxic acid
c)
water
d)
hydrogen oxide
128.
What salt is produced if you react sodium hydroxide with hydrochloric acid?
a)
sodium hydroxide
b)
sodium sulfate
c)
sodium nitrate
d)
sodium chloride
129.

Metal + Acid -> ___ + ___

a)

Salt + Hydrogen

b)

Metal Hydroxide + Hydrogen

c)

Metal Oxide + Hydrogen

d)

Metal Carbonate + Hydrogen

130.

Sodium + Hydrochloric acid ->

a)

Sodium chlorine

b)

Sodium chlorine + hydrogen

c)

Sodium chloride + hydrogen

d)

Sodium chloride

131.

What is the systematic name for:

CH4

a)

Monane

b)

Methane

c)

Ethane

d)

Diane

132.

In the chemical compound C2H2, how many pairs of electrons are shared between the two carbon atoms?

a)

one pair of electrons

b)

two pairs of electrons

c)

three pairs of electrons

133.

Name the acid found naturally in citrus fruits.

a)

Ethanoic Acid

b)

Sulphuric Acid

c)

Citric Acid

d)

Hydrochloric Acid

134.

1. Which of the following can be beaten into thin sheets?

a)

Zinc

b)

Phosphorus

c)

Sulphur

d)

Oxygen

135.

7)The property of metal by which it can

be drawn into wires is called

a)

ductility

b)

malleable

c)

lustrous

d)

sonorous

136.
Iron is a good conductor, malleable and magnetic. What type of element is Iron? 
a)
Metal
b)
Nonmetal
c)
Metalloid
d)
Pretty
137.
Fluorine is used in many tooth pastes because it helps maintain healthy teeth.  At room temperature it is gaseous, and does not conduct electricity. Based off these properties, it would be classified as?
a)
A metal
b)
A non metal
c)
A metalloid
138.

Which of the following is the only metal that exist as a liquid at room temperature?

a)

Gold (Au)

b)

Mercury (Hg)

c)

Titanium (Ti)

d)

sodium

139.

Which element is a black shiny solid at room temperature but turns into a purple vapour when heated?

a)

Bromine

b)

Chlorine

c)

Iodine

d)

Fluorine

140.

What does sonorous mean?

a)

Clean

b)

Shiny

c)

Can make a sound

d)

Sharp

141.

Metals can be drawn into wires

a)

Luster

b)

Flexible

c)

Ductile

d)

Malleable

142.

Metals allow energy to flow through them, causing heating

a)

Malleable

b)

Sonorous

c)

Electrical Conductor

d)

Thermal Conductor

143.

All metals conduct electricity

a)

Malleable

b)

Sonorous

c)

Electrical Conductor

d)

Thermal Conductor

144.

Metals are sonorous in nature. What is sonorous?

a)

Making into powder

b)

Drawn into wires

c)

Make sound on beating

d)

None of these

145.

Magnesium is lustrous, malleable, and a good conductor. Is it a metal, nonmetal, or metalloid?

a)

Metal

b)

Nonmetal

c)

Metalloid

d)

None of the above

146.

Phosphorus is dull, brittle, and an insulator. Is it a metal, nonmetal, or metalloid?

a)

Metal

b)

Nonmetal

c)

Metalloid

d)

None of the above

147.

If an element reflects light well, it is considered...

a)

to have luster or is lustrous

b)

to be malleable.

c)

to be a good conductor.

d)

to be dull.

148.

It does NOT dissolve in water

a)

soluble

b)

insoluble

149.

A mixture that looks clear contains _________ substance.

a)

soluble

b)

insoluble

150.

Which substances are insoluble in water? (choose TWO answers)

a)

sand

b)

salt

c)

sugar

d)

flour

151.

Ammonium Sulfide

a)

soluble

b)

insoluble

152.

CaCO3

a)

soluble

b)

insoluble

153.

Sugar in water

a)

Soluble

b)

Insoluble

154.

Salt in water

a)

Soluble

b)

Insoluble

155.

Rice in water

a)

Soluble

b)

Insoluble

156.

Sand in water

a)

Soluble

b)

Insoluble

157.
What gas is produced when sodium reacts with water?
a)
Hydrogen
b)
Carbon dioxide
c)
Carbon monoxide
d)
Water vapour
158.

In burning Magnesium ribbon, do not look directly at the flame. Because

a)

it can burn our eyes

b)

it can melt our eyes

c)

Magnesium burns very brightly and the light could harm our eyes

d)

it can warm our eyes

159.

When the hydrogen pops, it is reacting with oxygen to form .....

a)

water

b)

gas

c)

ash

d)

pop

160.

Stephanie Kwolek was born in

a)

Birmingham

b)

Alabama

c)

Pennsylvania

d)

Rathdrum

161.
Kevlar ..... Stephanie Kwolek
a)
was discovered by
b)
was invented by
c)
was designed by
d)
was based on 
162.

Which of the following scientists invented Kevlar?

a)

Florence Sabin

b)

Virginia Apgar

c)

Barbara McClintock

d)

Stephanie Kwolek

163.

What company did Stephanie Kwolek work for?

a)

Kevlar

b)

DuPont

c)

Remington

d)

Springfield

164.

In what year was Stephanie Kwolek born?

a)

1913

b)

1923

c)

1918

d)

1921

165.
The smallest part of an element is
a)
proton
b)
atom
c)
compound
d)
mixture
166.

Which is correct...

a)

Most of the mass of an atom is concentrated towards the outside

b)

That the mass of an atom is equally distributed

c)

The the mass of an atom is concentrated in the centre of the atom

d)

The masses of atoms are so small that are not important

167.
What are the different elements in carbon dioxide?
a)
carbon
b)
cobalt and oxygen
c)
oxygen and carbon
d)
oxide and carbon
168.

Valence electrons are found

a)

in the innermost energy level of an atom

b)

in the middle energy levels of an atom

c)

in the outermost energy levels of an atom

169.

How does oxygen become an oxide ion?

a)

it loses 2 electrons

b)

it gains 2 electrons

c)

it shares electrons

d)

it releases energy

170.

When an atom loses an electron, it becomes a

a)

positive ion

b)

negative ion

c)

neutral ion

d)

neutral atom

171.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

172.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

173.

How many Oxygen atoms are in Al₂(SO₄)₃?

a)

4

b)

12

c)

7

d)

24

174.
Value representing the number of protons in an element
a)
Atomic Mass
b)
Mass Number
c)
Valence Electrons
d)
Atomic Number
175.
The image shows the periodic grid for POTASSIUM. What is Potassium's atomic number?
a)
19
b)
39
c)
20
d)
Impossible to tell
176.

Has a definite shape, mass, and volume

a)

solid

b)

liquid

c)

gas

d)

matter

177.

When an ice cube ______, it becomes a liquid.

a)

Condensation

b)

Evaporation

c)

Freezes

d)

Melts

178.

The smallest building block of all matter in the universe.

a)

Atom

b)

Matter

c)

Proton

d)

Element

179.

Positively charged atomic particles

a)

Proton

b)

Nucleus

c)

Neutron

d)

Electron

180.

Studies chemicals, matter and its properties, and atoms in order to understand how elements join together to form different substances.

a)

Scientist

b)

Chemist

c)

Einstein

d)

Chemical Engineer