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WorksheetsIdentifying atoms, elements, molecules, & Compounds
Total questions: 35
Worksheet time: 1hrs 26mins
Name
Class
Date
1.
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
2.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
3.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
4.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
5.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
6.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
7.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
8.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
9.
How many atoms of Carbon are in the compound C2H8O ?
a)
8
b)
2
c)
1
d)
11
10.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
11.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
12.
2H2 + O2 --------> 2H2O What is the yield?
a)
2H2O
b)
------>
c)
2H2 + O2
13.
2H2 + O2 --------> 2H2O What are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
14.
What is the atomic number?
a)
number of protons
b)
number of neutrons
15.
a capital letter or combination of a capital letter and a small letter that is used to represent an element is called a(n) ________
a)
chemical symbol
b)
element sign
16.
Number of C's in CO
a)
1
b)
2
c)
3
d)
4
17.
The law of conservation of matter states that
a)
chemical reactions change matter.
b)
in chemical reactions, the identity of reactants and products is conserved.
c)
atoms are neither created nor destroyed in chemical reactions.
d)
a chemical equation must be balanced.
18.
Number of H atoms in (NH₄)₂Cr₂O₇
a)
4
b)
6
c)
8
d)
56
19.
Number of Cr atoms in (NH₄)₂Cr₂O₇
a)
2
b)
6
c)
8
d)
56
20.
Number of O atoms in (NH₄)₂Cr₂O₇
a)
2
b)
6
c)
7
d)
56
21.
Number of Cr atoms in Al₂(Cr₂O₇)₃
a)
2
b)
5
c)
6
d)
9
22.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
23.
How many atoms of Al are in Al₂(SO₄)₃
a)
1
b)
2
c)
8
d)
12
24.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
25.
CaCo3
a)
Element
b)
Compound
26.
CO2
a)
Element
b)
Compound
27.
H2
a)
Element
b)
Compound
28.
H2O
a)
Element
b)
Compound
29.
Ca23
a)
Element
b)
Compound
30.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
31.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
32.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
33.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
34.
I am a small particle that is the building block of life. What am I?
a)
Atom
b)
Molecule
c)
Element
d)
Compound
35.
I am a particle made up of two or more atoms bonded together. What am I?
a)
Atom
b)
Compound
c)
Molecule
d)
Element
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