MEDIUM
Earn 100

Heat is released during a chemical reaction.

50% studentsanswered this correctly

Important Questions on Physical and Chemical Changes

EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What is corrosion? 
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Changes in which one or more new substances are formed are called _____ changes.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
When magnesium is burnt, a new substance _____ is formed.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Fitting the handle on an iron axe is done by the action of _____ (heat / cold).
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Those changes in which new substances are formed are called _____.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes

(Fill in the blanks with correct word given in the bracket)

On heating _____ expand most. (liquids / gases /solids)

EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
On heating, _____ (gas/liquid) expands the most.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes

Choose the correct word from the list given below :
List: solution, expands, irreversible, reversible. You may use a word/words more than once.

Iron _____ on heating.

EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Gases _____ the most on heating.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
When we dip a thermometer in warm water, the mercury in it _____.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Evaporation of water is _____ as heat is absorbed to convert it into water vapour.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes

_____ causes an increase in the size of the substance.     

solid expansion melting gas molecules liquid arrangement
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
When you heat something it _____.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Chemical changes bring a change in the _____ properties of matter.
HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Energy is _____ in all chemical changes. (involved / not involved)
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Most substances _____ as their temperature rises.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
On _____ materials contract.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
On heating the volume/size of most substances _____(increases/decreases).
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Cooling causes _____ in a material. (expansion/ contraction)
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
_____ ribbon burns with dazzling white flame.