WorksheetsCounting Atoms 1
Total questions: 20
Worksheet time: 19mins
Name
Class
Date
1.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
2.
What elements are represented in this chemical formula? Fe2O3
a)
Iron, Oxygen
b)
Francium, Europium, Oxygen
c)
Ferrium, Oxygen
d)
Berylium, Oxygen
3.
What is the total number of atoms in this formula? H2O2
a)
2
b)
4
c)
3
4.
Is this an element or a compound? CaSO4
a)
Element
b)
Compound
5.
Which element has the greatest number of atoms? AgNO3
a)
Silver
b)
Nitrogen
c)
Oxygen
6.
How many total atoms are in this compound?
H2C3O4N5
H2C3O4N5
a)
5
b)
14
c)
15
d)
19
7.
How do you THINK this compound structure of alcohol would be written?
a)
H2O
b)
CH3CH2OH
c)
CHO
d)
C9H9O9
8.
5CO2
How many molecules are there? How many elements?
a)
5 molecules, 2 elements
b)
5 elements, 5 molecules
c)
10 atoms, 5 elements
d)
15 elements, 2 molecules
9.
How many total atoms in the chemical formula?
a)
3
b)
4
c)
5
d)
6
10.
How many total atoms in (PO4)2?
a)
6
b)
7
c)
9
d)
10
11.
Which formulas have the most number of HYDROGENs?
a)
b)
c)
d)
12.
Which 2 atoms have similar reactivity? (remember, SAME FAMILY)
a)
b)
c)
d)
13.
What is the MOLECULAR MODEL for the chemical formula above?
a)
C-C-O
b)
C-O-O
c)
C O
d)
C-C-O-O
14.
What is the CHEMICAL FORMULA for the molecular model pictured above?
a)
CH
b)
C4H4
c)
CH4
d)
C4H
15.
What is the MOLECULAR MODEL for the chemical formula above?
a)
Ca-Cl-Cl
b)
Ca-Cl
c)
Ca Cl Cl
d)
Ca-Ca-Cl-Cl
16.
What is the CHEMICAL FORMULA for the molecular model pictured above?
a)
CO
b)
OC2
c)
C2O
d)
CO2
17.
What ELEMENTS are present in the chemical formula: CH4
a)
Carbon and Helium
b)
Carbon and Hydrogen
c)
Calcium and Hydrogen
d)
Copper and Helium
18.
What is the MOLECULAR MODEL for the chemical formula above?
a)
N-H
b)
N-N-N-H-H-H
c)
N-H-H-H
d)
N H - N H - N H
19.
What number identifies the COEFFICIENT in the chemical formula: 3CH4
a)
3
b)
4
20.
What is the SMALL number in a chemical formula known as?
a)
Coefficient
b)
Subscript
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