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