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Physical and Chemical Changes
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General Science for Class 7
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Physical and Chemical Changes
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Physical and Chemical Changes
The reaction of ‘magnesium’ with air is
exothermic reaction
endothermic reaction
reversible reaction
substitution reaction
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Physical and Chemical Changes
Respiration is a
physical process
chemical process
biological process
temporary process
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Physical and Chemical Changes
Cooking food is an example of
condensation reaction
exothermic reaction
reversible reaction
endothermic reaction
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Physical and Chemical Changes
For security and military purpose, ammonia is used in
explosives
bullets
flash bangs
tear gas shells
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Physical and Chemical Changes
Plastic was invented by
British inventor
French inventor
American inventor
Spanish inventor
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Physical and Chemical Changes
The exothermic reaction of two elements, iron and sulfur, form the compound,
iron only
sulphur only
iron and sulphur both
iron sulfide
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Physical and Chemical Changes
When the liquid is cooled down, it changes into solid, this process is known as
melting
freezing
condensation
sublimation
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Physical and Chemical Changes
The color of copper sulfate crystals is
black
blue
orange
white
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Physical and Chemical Changes
‘Ethene’ is a also known as
ethane
methane
ethylene
bromothane
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Physical and Chemical Changes
Mixing of iron and sulphur together brings
chemical change
physical change
biological change
organic change
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