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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 is only once capital letter
B
There is only one color
C
There are 2 different capital letters
D
There is only one size molecule
3) What are the common elements found in Earth's oceans?
A
Oxygen and Hydrogen
B
Hydrogen and Silicon
C
Oxygen and Silicon
D
Hydrogen and Nitrogen
4) What are the most common elements found in Earth's Crust?
A
Hydrogen and Silicon
B
Hydrogen and Nitrogen
C
Oxygen and Silicon
D
Oxygen and Hydrogen
5) What are the most common elements found in Earth's Atmosphere?
A
Carbon and Hydrogen
B
Nitrogen and Oxygen
C
Nitrogen and Carbon
D
Oxygen and Carbon
6) What are the most common elements found in living organisms?
A
Oxygen and Carbon
B
Carbon and Hydrogen
C
Nitrogen and Carbon
D
Nitrogen and Oxygen
7) What happens during a chemical change?
A
Two or more chemicals react together
B
all of the above
C
a new substance is made
D
It can not be easily changed back
8) Which of the following is evidence of a chemical change?
A
one liquid disappears into another
B
when bubbles are produced
C
when a substance melts
D
when two substances mix together
9) CO2 is considered a ...
A
a compound
B
an element
C
Mixture
D
Solution
10) Na is considered
A
Solution
B
an element
C
A compound
D
Mixture
11) Which substance is an element?
A
H2O
B
NH4
C
O2
D
NaCl
12) Which substance is a compound
A
CaCO3
B
C4
C
O2
D
Na
*select an answer for all questions
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