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Chemical Equations, Formulas, And Reactions
Test Description: Review questions over chemical equations, formulas, and reactions (Unit 2).
Instructions: Answer all questions to get your test result.
1) What are the chemical formulas on the LEFT side of a chemical equation called?
A
Coefficients
B
Yeilds
C
Reactants
D
Products
2) What are the chemical formulas on the RIGHT side of a chemical equation called?
A
Subscripts
B
Products
C
Reactants
D
Coefficients
3) What are the small numbers to the bottom-left of an atomic symbol called?
A
Coefficients
B
Yeilds
C
Products
D
Subscripts
4) Two clear liquid solutions are combined together, then a white solid precipitate begin falling to the bottom of the solution. This is evidence of a chemical reaction having occurred.
A
True
B
False
5) Which is the BEST set of indicators that a chemical reaction has happened?
A
precipitate, light, new substance
B
temperature, color, smell
C
temperature, color, smell, precipitate, bubbling, light, new substance
D
Heat, light, bubbles, and glass
6) What is the large number in front of a chemical formula called?
A
Subscript
B
Coefficient
C
Reactant
D
Yeild
7) What must be balanced on both sides of a chemical equation?
A
The area of reaction and the volume of reaction
B
The amount of space in which the reaction takes place
C
The number of atoms of each element used in the equation
D
The number of elements used
8) What is a byproduct of most chemical reactions?
A
the release of cold energy
B
the creation of new atoms
C
the absorption of energy
D
the release of heat energy
9) How may atoms of Oxygen are in this formula? (assume that the numbers after each atomic symbol is the subscript for that element) - C2H4O4
A
3
B
4
C
2
D
0
10) How do humans use chemical reactions every day?
A
Waking up
B
Walking
C
The digestion of food
D
Going to sleep
*select an answer for all questions
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