Chemical Changes and Reactions
Assessment
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Sony J
•
Chemistry
•
9th Grade
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310 plays
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Medium
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10 questions
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1.
Multiple Choice
10 sec
12 pts
The substances at the beginning of a chemical equation are called the ____
product
yield
chemical symbol
reactants
2.
Multiple Choice
10 sec
12 pts
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
Mg and O
MgO
Mg and MgO
O and MgO
3.
Multiple Choice
10 sec
1 pt
Which of the following models best demonstrates a balanced chemical equation?
F
G
H
J
4.
Multiple Choice
10 sec
1 pt
The equation below represents a chemical reaction that occurs in living cells. How many atoms are represented in the reactants of this equation?
6
6
12
12
24
24
36
36
5.
Multiple Choice
10 sec
1 pt
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
H3PO4
H2SO4
HCIO3
H20
6.
Multiple Choice
10 sec
1 pt
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes
Oxygen is present
A new substance is produced
Coal is made up of more than one element
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