Question

which of the following statement is false
a.) change in shape is a physical change
b.)change in size is a physical change
c.) change in state is a chemical change
d.) formation of a new substance is a chemical change
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Answer 1

Answer:

c change in state is a chemical change

is false..

Answer 2

The statement that is false is that change in state is a CHEMICAL CHANGE. (OPTION C)

CHANGES OF MATTER -

1. Physical change

• Involves the rearrangement of molecules without change in the composition of the reactants.
• Temporary change that affects the physical property of the reactants such as shape, size, state.
• Reversible reaction and no energy is released during the reaction.
• A new chemical product is not formed.
• Example - Melting of ice, Boiling of water, Burning of a candle.

2. Chemical change

• Involves change in the composition of the reactants and formation of new chemical products.
• The reaction can be endothermic or exothermic.
• Irreversible with change in chemical properties of the reactants.
• Example - Iron rusting, Burning of coal.