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Chemical Reactions Review 1
Test Description: Chemistry
Instructions: Answer all questions to get your test result.
1) Which of the following is NOT a correct inference you can make about the burning of a candle?
A
New substances are produced.
B
Chemical bonds are broken and new ones are formed.
C
Energy is released.
D
The reactions is a physical change.
2) A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be
A
unbalanced
B
an incomplete reaction
C
balanced
D
a replacement reaction
3) NaCl represents a chemical
A
reaction
B
subsript
C
symbol
D
formula
4) The only sure evidence that a chemical reaction has taken place is
A
changes in properties.
B
the formation of a gas.
C
the production of one or more new substances.
D
a color change.
5) In chemical reactions, what does the principle of conservation of mass mean?
A
The total mass of the reactants is less than the total mass of the products.
B
Matter is not created or destroyed.
C
The total mass of the reactants is greater than the total mass of the products.
D
Matter is not changed.
6) The substances listed on the left side of a chemical equation are the
A
products
B
reactants
C
coefficients
D
precipitates
7) The number placed below an element’s symbol in a chemical formula is called a
A
product
B
reactant
C
coefficient
D
subscript
8) In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the
A
number of molecules or atoms of each substance in the reaction.
B
number of atoms in each molecule in the reaction.
C
number of molecules in each atom in the reaction.
D
number of elements in the reaction.
9) If there are 16 grams of product produced by the chemical reaction, how many grams of reactant were consumed?
A
10 g
B
0 g
C
16 g
D
12 g
10) When 60 g of calcium is added to 100 g of zinc carbonate it produces 145 grams of calcium carbonate and _____ g of zinc.
A
15
B
175
C
160
D
305
*select an answer for all questions
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