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Unit 2: Elements And Compounds (Chemistry I)
Test Description: Elements vs. compounds, common elements, and evidences of a chemical change
Instructions: Answer all questions to get your test result.
1) How can you tell if the object is an element?
A
There are 2 different capital letters
B
There is only one size molecule
C
There are 2 substances bonded together
D
There are 2 different colors
2) How can you tell if a substance is a compound?
A
There are 2 different capital letters
B
There is only one color
C
There is only one size molecule
D
There is only once capital letter
3) What are the common elements found in Earth's oceans?
A
Oxygen and Silicon
B
Hydrogen and Nitrogen
C
Oxygen and Hydrogen
D
Hydrogen and Silicon
4) What are the most common elements found in Earth's Crust?
A
Hydrogen and Silicon
B
Hydrogen and Nitrogen
C
Oxygen and Hydrogen
D
Oxygen and Silicon
5) What are the most common elements found in Earth's Atmosphere?
A
Nitrogen and Oxygen
B
Nitrogen and Carbon
C
Carbon and Hydrogen
D
Oxygen and Carbon
6) What are the most common elements found in living organisms?
A
Nitrogen and Oxygen
B
Carbon and Hydrogen
C
Nitrogen and Carbon
D
Oxygen and Carbon
7) What happens during a chemical change?
A
It can not be easily changed back
B
a new substance is made
C
Two or more chemicals react together
D
all of the above
8) Which of the following is evidence of a chemical change?
A
when two substances mix together
B
one liquid disappears into another
C
when a substance melts
D
when bubbles are produced
9) CO2 is considered a ...
A
a compound
B
Mixture
C
Solution
D
an element
10) Na is considered
A
Mixture
B
an element
C
A compound
D
Solution
11) Which substance is an element?
A
NaCl
B
NH4
C
H2O
D
O2
12) Which substance is a compound
A
Na
B
O2
C
C4
D
CaCO3
*select an answer for all questions
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