WorksheetsQuizs Counting Atoms, Molecules, and Elements
Total questions: 17
Worksheet time: 9mins
Name
Class
Date
1.
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
2.
Which of the following is a molecule?
a)
H
b)
O
c)
H2O
d)
Na
3.
How many atoms are in one molecule of CO2?
a)
1
b)
2
c)
3
d)
4
4.
How many atoms are in a molecule of NaCl?
a)
1
b)
2
c)
3
d)
4
5.
What is the chemical formula for a molecule with two carbon atoms and four hydrogen atoms?
a)
C2H2
b)
CH4
c)
C2H4
d)
C4H2
6.
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
7.
Which element is in row 3 group14?
a)
Nitrogen
b)
Oxygen
c)
Sodium
d)
Carbon
8.
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
9.
How many total atoms are in one molecule of C6H12O6?
a)
12
b)
24
c)
18
d)
6
10.
Which formula represents a compound?
a)
O2
b)
C
c)
NaCl
d)
H
11.
What is the total number of atoms in one molecule of H2SO4?
a)
6
b)
7
c)
5
d)
8
12.
How many nitrogen atoms are in one molecule of NH3?
a)
1
b)
2
c)
3
d)
4
13.
How many hydrogen atoms are in one molecule of CH4?
a)
1
b)
2
c)
4
d)
5
14.
How many oxygen atoms are in one molecule of CO2?
a)
3
b)
2
c)
1
d)
4
15.
How many oxygen atoms are in two molecules of H2O?
a)
1
b)
2
c)
3
d)
4
16.
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
17.
How many elements are in borax (Na2B4O7)?
a)
2
b)
3
c)
4
d)
1
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