Chemical Reactions: Question Preview (ID: 6643)

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A chemical reaction consists of
a) only reactant.
b) only products.
c) reactants and products.
d) neither reactants nor products.

During a chemical reaction,
a) mass of reactants is less than mass of products.
b) mass of reactants is equal to the mass of products.
c) mass of reactants is greater than mass of products.
d) mass of reactants and products increases.

An example of chemical change is
a) Melting of ice.
b) Breaking glass.
c) Grinding chalk.
d) Rusting of iron.

An example of physical change is
a) Bending an iron rod.
b) Combustion of wood.
c) Oxidation of apple.
d) Burning garbage.

The combustion of butane gas is
a) an endothermic reaction.
b) an exothermic reaction.
c) can be endothermic or exothermic reaction.
d) neither endothermic, nor exothermic reaction.

If the mass of reactants = 30 g, then the mass of products is equal to
a) 20 g
b) 25 g
c) 30 g
d) 35 g

Magnesium reacts with oxygen gas in air to produce magnesium oxide. The word equatin of the reaction is written as
a) Magnesium oxide--->Magnesium + Oxygen gas
b) Magnesium--->Oxygen gas + Magnesium oxide
c) Magnesium+oxygen gas--->Magnesium oxide + Water
d) Magnesium + oxygen gas ---> Magnesium oxide

The combustion of butane gas produces carbon dioxide and water vapor. The products of the reaction are:
a) Butane gas and oxygen gas.
b) Carbon dioxide and butane gas.
c) Carbon dioxide and water vapor.
d) Water vapor and oxygen gas.

Acid reacts with base to produce salt and water. The word equation of the reaction is written as:
a) acid + water ----> salt + base
b) acid + base ----> salt + water
c) salt + water ----> acid + base
d) base + water ----> salt + acid

During a chemical change,
a) No new substances are formed.
b) New substances are formed.
c) The identity of the substance is not changed.
d) The new substances disappear.

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