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Chemical Reactions
Test Description: Chemical reactions play an important role in our daily life. This game aims to review chemical reactions course for Grade 7 students.
Instructions: Answer all questions to get your test result.
1) A chemical reaction consists of
A
reactants and products.
B
only reactant.
C
neither reactants nor products.
D
only products.
2) During a chemical reaction,
A
mass of reactants is less than mass of products.
B
mass of reactants and products increases.
C
mass of reactants is greater than mass of products.
D
mass of reactants is equal to the mass of products.
3) An example of chemical change is
A
Breaking glass.
B
Melting of ice.
C
Grinding chalk.
D
Rusting of iron.
4) An example of physical change is
A
Bending an iron rod.
B
Combustion of wood.
C
Oxidation of apple.
D
Burning garbage.
5) The combustion of butane gas is
A
can be endothermic or exothermic reaction.
B
an endothermic reaction.
C
neither endothermic, nor exothermic reaction.
D
an exothermic reaction.
6) If the mass of reactants = 30 g, then the mass of products is equal to
A
25 g
B
30 g
C
35 g
D
20 g
7) Magnesium reacts with oxygen gas in air to produce magnesium oxide. The word equatin of the reaction is written as
A
Magnesium + oxygen gas --- Magnesium oxide
B
Magnesium---Oxygen gas + Magnesium oxide
C
Magnesium+oxygen gas---Magnesium oxide + Water
D
Magnesium oxide---Magnesium + Oxygen gas
8) The combustion of butane gas produces carbon dioxide and water vapor. The products of the reaction are:
A
Carbon dioxide and butane gas.
B
Butane gas and oxygen gas.
C
Water vapor and oxygen gas.
D
Carbon dioxide and water vapor.
9) Acid reacts with base to produce salt and water. The word equation of the reaction is written as:
A
acid + water ---- salt + base
B
salt + water ---- acid + base
C
acid + base ---- salt + water
D
base + water ---- salt + acid
10) During a chemical change,
A
New substances are formed.
B
No new substances are formed.
C
The identity of the substance is not changed.
D
The new substances disappear.
*select an answer for all questions
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