Chemical Reactions And Types Question Preview (ID: 36474)
Chemical Reactions And Types.
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Chemical reactions ____.
a) occur only in living organisms
b) create and destroy atoms
c) produce new substances
d) only occur outside living organisms
Chemical equations ____.
a) describe chemical reactions
b) show how to write chemical formulas
c) give directions for naming chemical compounds
d) describe only biological changes
Which of the following statements is NOT true about what happens in all chemical reactions?
a) The ways in which atoms are joined together are changed.
b) New atoms are formed as products.
c) The starting substances are called reactants.
d) The bonds of the reactants are broken and new bonds of the products are formed.
Which word equation represents the reaction that produces water from hydrogen and oxygen?
a) Water is produced from hydrogen and oxygen.
b) Hydrogen plus oxygen yields water.
c) Water plus hydrogen yields oxygen
d) Water can be separated into hydrogen and oxygen.
In what kind of reaction does one element replace a similar element in a compound?
a) decomposition
b) synthesis
c) ionic
d) displacement
According to the law of conservation of mass, the total mass of the reacting substances is
a) always more than the total mass of the products.
b) always less than the total mass of the products.
c) sometimes more and sometimes less than the total mass of the products.
d) always equal to the total mass of the products.
In what kind of reaction do two or more substances combine to form a new compound?
a) decomposition
b) ioinic
c) double displacement
d) synthesis
In what kind of reaction do two or more substances combine to form two or more simpler substances?
a) decomposition
b) synthesis
c) displacement
d) ionic
A chemical reaction has NOT occurred if the products have
a) the same mass as the reactants.
b) more energy than the reactants
c) less energy than the reactants
d) the same chemical properties as the reactants
The word equation solid carbon + oxygen gas ® carbon dioxide gas + energy, represents a chemical reaction because
a) the reaction releases energy.
b) Carbon dioxide has chemical properties that differ from those of C and O.
c) the reaction absorbs energy.
d) Carbon dioxideis a gas and carbon is a crystal.
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