WorksheetsCounting Atoms and Changes Review
Total questions: 36
Worksheet time: 25mins
Name
Class
Date
1.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
3.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
4.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
5.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
6.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
7.
How many atoms are in the element Carbon in this compound?
H2C3O4N5
H2C3O4N5
a)
2
b)
3
c)
4
d)
5
8.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
9.
A pure substance that cannot be broken down into simpler substances.
a)
element
b)
compound
c)
molecule
d)
carbon dioxide
10.
How many Oxygen atoms are in H2O?
a)
1
b)
2
c)
0
d)
4
11.
How many Magnesium atoms are in 10MgCl2?
a)
10
b)
5
c)
20
12.
How many Nitrogen atoms are in (NH₄)₂CrO₄?
a)
1
b)
2
c)
8
d)
16
13.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
14.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
15.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
16.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
17.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
18.
This picture represents which of the following?
a)
2 molecule elements
b)
2 molecule compounds
c)
mixture
19.
Element or Compound?
H2O
H2O
a)
Element
b)
Compound
20.
Element or Compound?
Salt (NaCl)
Salt (NaCl)
a)
Element
b)
Compound
21.
Which of these is true of fruits blended together?
a)
chemical change
b)
physical change
c)
both types of changes
d)
none of these
22.
Changes between states of matter are often which?
a)
chemical changes
b)
physical changes
c)
both
d)
neither
23.
When something burns it is which of these?
a)
chemical change
b)
physical change
c)
d)
24.
Is water melting a physical or chemical change?
a)
Physical
b)
Chemical
25.
Is digesting your food a physical or chemical change?
a)
Physical
b)
Chemical
26.
Is melting iron a physical or chemical change?
a)
Physical
b)
Chemical
27.
Is sour milk a physical or chemical change?
a)
Physical
b)
Chemical
28.
Is steam a physical or chemical change?
a)
Physical
b)
Chemical
29.
Are hard boiled eggs a physical or chemical change?
a)
Physical
b)
Chemical
30.
Is melting butter a physical or chemical change?
a)
Physical
b)
Chemical
31.
When baking soda and vinegar mix it creates a bubbly mess. Is this a chemical or physical change?
a)
Physical
b)
Chemical
32.
If a new substance is formed would this be a physical or chemical change?
a)
Physical
b)
Chemical
33.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
34.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
rust
35.
An unexpected change in color is a physical change.
a)
True
b)
False
36.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
100 %
