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