Chemical Reactions Review 1 Question Preview (ID: 42119)
Chemistry.
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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) 305
b) 15
c) 160
d) 175
If there are 16 grams of product produced by the chemical reaction, how many grams of reactant were consumed?
a) 16 g
b) 12 g
c) 10 g
d) 0 g
In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the
a) number of atoms in each molecule in the reaction.
b) number of elements in the reaction.
c) number of molecules or atoms of each substance in the reaction.
d) number of molecules in each atom in the reaction.
The number placed below an element’s symbol in a chemical formula is called a
a) subscript
b) coefficient
c) product
d) reactant
The substances listed on the left side of a chemical equation are the
a) products
b) coefficients
c) precipitates
d) reactants
In chemical reactions, what does the principle of conservation of mass mean?
a) Matter is not created or destroyed.
b) The total mass of the reactants is greater than the total mass of the products.
c) The total mass of the reactants is less than the total mass of the products.
d) Matter is not changed.
The only sure evidence that a chemical reaction has taken place is
a) the formation of a gas.
b) a color change.
c) the production of one or more new substances.
d) changes in properties.
A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be
a) balanced
b) unbalanced
c) an incomplete reaction
d) a replacement reaction
NaCl represents a chemical
a) symbol
b) formula
c) subsript
d) reaction
Which of the following is NOT a correct inference you can make about the burning of a candle?
a) Chemical bonds are broken and new ones are formed.
b) The reactions is a physical change.
c) New substances are produced.
d) Energy is released.
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