Chemical Changes and Reactions
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Physical vs Chemical Changes
SubtopicPhysical vs Chemical Changes under Chemical Changes and Reactions for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which of the following is a fast physical change?
A.Rusting of an iron gate
B.Breaking of a glass pane
C.Ripening of an apple
D.Formation of coal
- 2.
During which of these changes is the identity of the substance preserved?
A.Burning of paper
B.Dissolving salt in water
C.Souring of curd
D.Formation of rust
- 3.
The process of condensation (steam turning into water) is a:
A.Chemical change
B.Physical change
C.Irreversible change
D.Evolutionary change
Download the worksheet for Chemical Changes and Reactions - Physical vs Chemical Changes to practice offline. It includes additional chapter-level practice questions.
Types of Chemical Reactions
SubtopicTypes of Chemical Reactions under Chemical Changes and Reactions for Grade 7 ICSE.
Preview questions (no answers)
- 1.
When iron powder and sulphur powder are heated together, they form iron sulphide. This is a:
A.Decomposition reaction
B.Combination reaction
C.Displacement reaction
D.Double Displacement reaction
- 2.
Which of these gases turns lime water milky?
A.Oxygen
B.Hydrogen
C.Carbon dioxide
D.Nitrogen
- 3.
In which reaction is energy taken in from the surroundings?
A.Exothermic
B.Endothermic
C.Burning
D.Neutralization
Download the worksheet for Chemical Changes and Reactions - Types of Chemical Reactions to practice offline. It includes additional chapter-level practice questions.
Conditions for Chemical Changes
SubtopicConditions for Chemical Changes under Chemical Changes and Reactions for Grade 7 ICSE.
Preview questions (no answers)
- 1.
What happens to the rate of a reaction if the concentration of the reactants in a solution is increased?
A.It increases
B.It decreases
C.It stops
D.It remains unchanged
- 2.
Which of these processes requires light to occur?
A.Burning of paper
B.Photosynthesis in plants
C.Melting of wax
D.Digestion of food
- 3.
Which of the following is a characteristic of a catalyst?
A.It is consumed in the reaction
B.It changes the state of products
C.It remains chemically unchanged at the end
D.It provides energy to the reaction
Download the worksheet for Chemical Changes and Reactions - Conditions for Chemical Changes to practice offline. It includes additional chapter-level practice questions.
Energy Changes in Reactions
SubtopicEnergy Changes in Reactions under Chemical Changes and Reactions for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which of these is a similarity between respiration and burning coal?
A.Both are endothermic
B.Both require carbon dioxide
C.Both release energy (exothermic)
D.Both are physical changes
- 2.
What form of energy is primarily involved in the reaction of silver nitrate with light?
A.Heat energy
B.Light energy
C.Sound energy
D.Electrical energy
- 3.
In the chemical equation for an endothermic reaction, 'Heat' is usually written on which side?
A.The right side (products)
B.The left side (reactants)
C.Under the arrow
D.It is never written
Download the worksheet for Chemical Changes and Reactions - Energy Changes in Reactions to practice offline. It includes additional chapter-level practice questions.