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Unit 4 Compounds
Test Description: Review for unit 4 test
Instructions: Answer all questions to get your test result.
1) There are how many hydrogen atoms in this molecule? C12H22O11
A
11
B
12
C
22
D
45
2) Sugar dissolving into water is a physical change because...
A
The color changes when they dissolve
B
A gas is released when it dissolves
C
The sugar does not change the molecules just spread out
D
A precipitate forms when the sugar dissolves
3) What is the sign of a chemical change when rust forms?
A
The temperature changes
B
A color change
C
The molecules spread apart
D
A gas is released
4) Which of these applies ONLY to compounds?
A
Found on earth
B
Found on the periodic table
C
Essential to life
D
Forms in a chemical reaction
5) Which of these applies to BOTH elements and compounds?
A
Formed from a chemical reaction
B
Pure substance
C
Found on the periodic table
D
Made from more than one element
6) Which of these applies ONLY to elements?
A
essential to life
B
found on the periodic table
C
found on earth
D
made from more than one element
7) 2H2+O2 = 2H2O The product in this chemical equation is made of....
A
Two elements
B
One compound one element
C
two compounds
D
One compound
8) What is a product in a chemical equation
A
The substances you start with
B
The final substance produced
9) What is a reactant in a chemical equation?
A
The substance produced
B
The substance you start with
10) Which is NOT a sign of a possible chemical change?
A
temperature changes
B
cutting something into smaller pieces
C
color changing
D
forming a precipitate
11) C6H12O6 How many elements are in this equation?
A
1
B
3
C
24
D
82
12) Which of the following substances is a compound?
A
Be
B
H12Co
C
Fe14
D
O2
13) What is a physical change
A
When a new substance is formed
B
When something seems to change but stays the same chemically
C
When something changes forever
14) Students are given a sample of an unknown material. They want to perform tests to determine its density. Which test is MOST likely to change the sample into another material?
A
grinding it into powder
B
burning it into flame
C
heating it until it melts
D
dissolving it into water
15) When something burns it it a
A
physical change
B
chemical change
16) What is a chemical change
A
when a substance is changed into a new substance
B
When something is broken
C
When an object changes states of matter.
D
when something seems to change but stays the same chemically
17) The Best Friend's Club uses invisible ink to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper, but turns brown when a club member holds a burning candle under the paper. Once it is heated, it i
A
A chemical change because the the lemon juice burned into a new color
B
A physical change because they wrote on the paper
C
a chemical change because bubbles were produced.
D
A physical change because the color changed
18) Vanessa had a beaker with a small amount of baking soda. She added a few drops of vinegar to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Vanessa determine about her experimentIt wa
A
It was a conductor
B
It was magnetic
C
It was a gas
D
It was hot
19) Which of these is a pure substance
A
Element
B
mixtures
C
Both elements and compounds
D
Compound
*select an answer for all questions
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