Question

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9.What is litmus paper? How will the colour change happen in acid and base.
10.Differentiate between Bases and Alkalis.
11.What is milk of magnesia?
12.Which base s used for removing grease and stains?
13.What are crystalline and amorphous substances with examples?
14.Why is sodium hydroxide used to manufacture soap?
15.Write any 5 examples of physical change.
16.Explain why rusting of iron objects is faster in coastal areas than in deserts ?
17.”Heating zinc oxide is a physical change”.How?
18.Describe an activity to prove air and moisture is necessary for rusting.
19.What is exothermic and endo thermic reactions with example.
20. Explain the factors affecting neutralization.
21. What is acid rain? How it affects the environment.

Answer 1

litmus paper is a natural indicator which is obtained from lichen plants

antacid is called milk of magnesia it is an gases which reduces the acidity

Answer 2

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Ans9
→litmus paper is an indicator which helps to identify acid & base. Acid change blue litmus red and base changes red to blue.

Ans10
→Many bases are insoluble - they do not dissolve in water. If a base does dissolve in water, we call it analkali.

Ans11
→ white suspension of hydrated magnesium carbonate in water, used as an antacid or laxative.

Ans12
→Hydrogen peroxide is also a bleaching agent that can be used to treat stains.

Ans13

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Amorphous solids are a type of solid that lacks definition in shape, pattern and long-range order. They are opposite to crystalline solids, which have a defined shape, pattern, and long range order. Amorphous solids donot have a well-defined melting point.

Ans14
It is also known as caustic soda and soda lye. ... Sodium Hydroxide is a strong alkaline substance that dissociates completely in water to sodium and hydroxyl ions. This creates a strong exothermic reaction when it is added to water.