WorksheetsTEST Counting Atoms, Molecules, and Elements
Total questions: 22
Worksheet time: 11mins
Name
Class
Date
1.
Name (First and last)
4 lines
2.
Hour
a)
1
b)
2
c)
5
d)
6
3.
What is an atom?
a)
The smallest unit of a chemical element
b)
A large molecule
c)
A type of rock
d)
A kind of animal
4.
Which of the following is a molecule?
a)
H
b)
O
c)
H2O
d)
Na
5.
How many atoms are in one molecule of CO2?
a)
1
b)
2
c)
3
d)
4
6.
What is an element?
a)
A mixture of compounds
b)
A substance made of only one type of atom
c)
A combination of atoms
d)
A type of plant
7.
Which formula represents a compound?
a)
O2
b)
C
c)
NaCl
d)
H
8.
How many hydrogen atoms are in one molecule of CH4?
a)
1
b)
2
c)
4
d)
5
9.
What does the subscript in a chemical formula indicate?
a)
The element's weight
b)
The number of atoms of that element in the molecule
c)
The molecule's size
d)
The color of the element
10.
How many oxygen atoms are in two molecules of H2O?
a)
1
b)
2
c)
3
d)
4
11.
How many total atoms are in one molecule of C6H12O6?
a)
12
b)
24
c)
18
d)
6
12.
Which is the correct way to count atoms in the molecule H2SO4?
a)
2 hydrogen, 1 sulfur, 4 oxygen
b)
1 hydrogen, 2 sulfur, 4 oxygen
c)
2 hydrogen, 4 sulfur, 1 oxygen
d)
4 hydrogen, 2 sulfur, 1 oxygen
13.
How many nitrogen atoms are in one molecule of NH3?
a)
1
b)
2
c)
3
d)
4
14.
What is the chemical formula for a molecule with two carbon atoms and four hydrogen atoms?
a)
C2H2
b)
CH4
c)
C2H4
d)
C4H2
15.
How many total atoms are in a molecule of NaCl?
a)
1
b)
2
c)
3
d)
4
16.
How many elements are in borax (Na2B4O7)?
a)
2
b)
3
c)
4
d)
1
17.
Which element is in row 3 group14?
a)
Nitrogen
b)
Oxygen
c)
Sodium
d)
Silicon
18.
How many oxygen atoms are in one molecule of CO2?
a)
3
b)
2
c)
1
d)
4
19.
What is the total number of atoms in one molecule of H2SO4?
a)
6
b)
7
c)
5
d)
8
20.
What is the chemical symbol for Iron
a)
I
b)
Ir
c)
Fe
d)
F
21.
How Many Aluminium atoms are there in the formula 3AlCl3
a)
1
b)
3
c)
9
d)
6
22.
What is the mass number of Nitrogen (N)?
a)
7
b)
14
c)
5
d)
1
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