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Elements, Compounds, Atoms, and Molecules

Total questions: 18

Worksheet time: 9mins

Name
Class
Date
1.

Select two words that describe this diagram

a)

molecule

b)

element

c)

atom

d)

compound

2.

Select two words that describe this diagram

a)

molecule

b)

element

c)

atom

d)

compound

3.

Select two words that describe this diagram

a)

molecule

b)

element

c)

atom

d)

compound

4.

Select two words that describe this diagram

a)

molecule

b)

element

c)

atom

d)

compound

5.

Select two words that describe this diagram

a)

molecule

b)

element

c)

atom

d)

compound

6.

Select two words that describe this diagram

a)

molecule

b)

element

c)

atom

d)

compound

7.
Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?
a)
Hydrogen is an element made of two or more kinds of atoms.
b)
Hydrogen is a compound made of only one kind of atom.
c)
Hydrogen is a compound made of two or more kinds of atoms.
d)
Hydrogen is an element made of only one kind of atom.
8.
Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).
a)
methane is an element and carbon and hydrogen are compounds.
b)
carbon, hydrogen, and methane are all elements.
c)
carbon, hydrogen, and methane are all compounds.
d)
carbon and hydrogen are elements and methane is a compound.
9.
Atoms combine to form _______. 
a)
electrons
b)
molecules
c)
nuclei
d)
neutrons
10.
A compound is...
a)
a substance made up of one type of atom in its molecular form.
b)
a substance formed by the reaction of two or more elements.
c)
a mixture formed by the mixing of two or more elements.
d)
a substance made up of one type of atom in its atomic form.
11.
Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?
a)
atom
b)
mixture
c)
element
d)
compound
12.
What defines a mixture?
a)
described by a chemical formula
b)
can be broken down into its basic substances through physical means
c)
created through a chemical reaction
d)
cannot be broken down into simpler substances
13.

What is a compound?

a)

Two different elements bonded together.

b)

Two of the same elements bonded together.

c)

A mixture of different substances.

d)

Two substances stuck together with glue.

14.

Which statements are true about molecules and compounds?

a)

The particles that make up compounds are always molecules.

b)

Molecules are made of one atom and compounds are made of two or more atoms.

c)

HCl is both a compound, but not a molecule.

d)

Both molecules and compounds are mixtures of elements.

15.
The smallest particle of any element that still has the properties of that element is called
a)
an atom
b)
a compound
c)
a solution
d)
a mixture
16.
What does the diagram show?
a)
A mixture of two elements
b)
A pure compound
c)
A mixture of two compounds
d)
A mixture of a compound & element
17.
What does the diagram show?
a)
A mixture of two elements
b)
A pure compound
c)
A mixture of two compounds
d)
A mixture of a compound & element
18.
Which description below is a true statement about the diagram?
a)
The diagram can be classified as an element and a molecule
b)
The diagram can be classified as a compound
c)
The diagram can be classified as a mixture of two compounds
d)
The diagram can be classified as a mixture of two elements

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