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Chemical & Chemical changes

Total questions: 35

Worksheet time: 50mins

Name
Class
Date
1.

is the picture chemical or physical

a)

chemical

b)

physical

2.
Which part of an atom is POSITIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
3.
What part of an atom is NEGATIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
4.
Which part of an atom has no charge?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
5.
What is the picture displayed?
a)
Atom
b)
Element
c)
Molecule
d)
Compound
6.

What is the picture displayed?

a)

atom

b)

element

c)

compound

7.
What is the picture displayed?
a)
atom
b)
element
c)
molecule
d)
compound
8.

What is the picture displayed?

a)

compound

b)

element

c)

molecule

9.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A nucleus
d)
A molecule
10.

Which of the following cannot be broken down into something simpler?

a)

A compound

b)

An element

c)

A mixture

11.

How many Hydrogen atoms are present in H20?

a)

2

b)

4

c)

1

d)

0

12.
The element oxygen, represented by the symbol O, is classified as
a)
a pure substance
b)
a compound
c)
a mixture
d)
a solution
13.
The chemical combination of two or more different kinds of atoms in fixed amounts is called a(n)
a)
orbit
b)
compound
c)
mixture
d)
element
14.
Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?
a)
atom
b)
mixture
c)
element
d)
compound
15.
What defines a mixture?
a)
described by a chemical formula
b)
can be broken down into its basic substances through physical means
c)
created through a chemical reaction
d)
cannot be broken down into simpler substances
16.
The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?
a)
compound
b)
liquid
c)
element
d)
mixture
17.
the smallest particle of matter
a)
atom
b)
element
c)
molecule
d)
compound
18.
TRUE OR FALSE:
Every compound is a molecule but not every molecule is a compound.
a)
TRUE
b)
FALSE
19.
Which one can be found on the periodic table?
a)
Compound 
b)
Element
20.

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

21.

How many Aluminum atoms are in Al2O3?

a)

3

b)

2

c)

5

d)

1

22.

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

a)

0

b)

2

c)

only 1

d)

1 million

23.
 Fill in the blank to balance the chemical equation. 
2KI  +  ____Cl2 →  2KCl  +  I2
a)
1
b)
2
c)
3
d)
4
24.
What coefficient should go in the blank space to balance the chemical equation? 
2Al  +____  HCl   →    2AlCl3  +  3H2
a)
2
b)
4
c)
3
d)
6
25.

Identify the Reactants in this equation.

a)

A

b)

B

26.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
27.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
28.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
29.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
30.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
31.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
32.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
33.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

34.

The blue numbers represent - - - - - -

a)

Equation

b)

Coefficient

c)

Subscript

35.
A copper penny turning greenish after a few years is an example of ...
a)
Chemical Change
b)
Physical Change

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