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Chemicals and chemical changes

Total questions: 41

Worksheet time: 31mins

Name
Class
Date
1.

Which type of change is most often easily reversed?

a)

Chemical

b)

Physical

c)

Both a physical and chemical change.

d)

Neither a physical or chemical change.

2.

Identify what type of change happening in the picture below...

a)

Chemical Change

b)

Physical Change

c)

Endothermic Reaction

d)

Exothermic Reaction

3.

Identify what type of change happening in the picture below...

a)

Chemical Change

b)

Physical Change

c)

Endothermic Reaction

d)

Exothermic Reaction

4.

If the chemical properties of a substance remain unchanged & the appearance or shape of an substance changes it is a...

a)

Chemical Change

b)

Physical Change

c)

Both a physical and chemical change.

d)

Neither a physical or chemical change.

5.

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

a)

A glass falling and shattering on the floor.

b)

Baking a birthday cake.

c)

Burning a piece of paper.

d)

Baking soda and vinegar mixing together.

6.

A green powder is heated & a gas is given off while it turns to a black solid. This describes

a)

Physical Change

b)

Chemical Change

c)

Change in State

d)

Change in Temperature

7.

During Chemical Reactions, the new substances created are called?

a)

Precipitate

b)

Corrosion

c)

Reactants

d)

Products

8.

A cup of water is left outside for two days. When it was checked there was only half a cup left. What happened?

a)

evaporation; chemical change

b)

condensation; physical change

c)

evaporation; physical change

d)

condensation; chemical change

9.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

10.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

11.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

12.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

13.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

14.

Which of the following is a compound?

a)

zinc (Zn)

b)

magnesium (Mg)

c)

sodium chloride (NaCl)

d)

potassium (K)

15.

Which of the following is an element?

a)

potassium chloride (KCl)

b)

water (H2O)

c)

carbon (C)

d)

calcium carbonate (CaCO3)

16.
A molecule is________
a)
a glob of gelatinous goo
b)
smaller than an atom
c)
filled with raisons
d)
more than one atom bonded together
17.
CH4 + 2 O2 → CO2 + 2H2O
 In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
18.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
19.
Pb(NO3)2 →PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
20.
During an exothermic reaction, what happens to energy in relation to the surroundings?
a)
released to
b)
absorbed from
c)
 mixed with
21.

Which are the reactants in the following reaction?

2Mg + O2 ---> 2MgO

a)

2MgO

b)

2Mg +O

c)

2Mg + O2

22.
What is this?
a)
Mixture of compounds and elements
b)
Compound
c)
Element
d)
Mixture of compounds
23.
What is this?
a)
Mixture of compounds
b)
Mixture of elements
c)
Compound
d)
element
24.
What is this?
a)
Compound
b)
Element
c)
Mixture of elements
d)
Mixture of compounds
25.
What is this?
a)
Compound
b)
Element
c)
Mixture of compounds
d)
Mixture of compounds and elements
26.
This subatomic particle of an atom has a POSITIVE charge.
a)
electron
b)
neutron
c)
proton
d)
amitron
27.
This subatomic particle of an atom has a NEGATIVE charge.
a)
electron
b)
proton
c)
atom
d)
neutron
28.
A molecule is made up of ____ or more atoms.
a)
1
b)
2
c)
3
d)
4
29.

How many atoms are there TOTAL in H2SO4 ?

a)

6

b)

5

c)

7

d)

3

30.

A subscript is the small number below the element symbol that tells the number of _______ of that element.

a)

atoms

b)

valence electrons

c)

protons

d)

elements

31.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
32.

How many Nitrogen atoms are in the in H2C3O4N5?

a)

2

b)

3

c)

4

d)

5

33.

How many atoms are present if there is no subscript following the element symbol?

a)

0

b)

2

c)

only 1

d)

1 million

34.

What is the picture displayed?

(tick all appropriate answers)

a)

atom

b)

element

c)

molecule

d)

compound

35.

How many ELEMENTS are in AgNO3?

a)

1

b)

12

c)

3

d)

6

36.

Describe this

a)

one compound

b)

two compounds

c)

pure elements

d)

mixture of pure elements

37.

Which of these is NOT a sign of a chemical change?

a)
b)
c)
d)
38.
A substance made up of only one kind of atom
a)
Element
b)
Elementary 
c)
Ellie
d)
Elephant
39.
A substance made up of atoms of two or more elements that are chemically combined.
a)
Compound
b)
Element
c)
Atom
d)
Nucleus
40.
What is the tiniest particle in the entire universe?
a)
cells
b)
gases
c)
atoms
d)
liquids
41.

Name the insoluble product formed when two compounds react in their aqueous solution state.

a)

A) Reactant

b)

B) Precipitate

c)

C) Catalyst

d)

D) Water

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