SEBA Class 7 Science Important Chapter 6 Physical and Chemical Changes

SEBA Class 7 Science Important Chapter 6 Physical and Chemical Changes Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 7 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 7 General Science Download PDF. Important Notes for Class 7 Science SCERT.

SEBA Class 7 Science Important Chapter 6 Physical and Chemical Changes

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 7 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 7 General Science Important Notes for All Chapters, You can practice these here.

Physical and Chemical Changes

Chapter: 6

IMPORTANT QUESTION ANSWER

A. Very Short Type Questions & Answers:

1. What is a physical change?

Ans: A physical change is one in which no new substance is formed and only the physical properties of a substance change.

2. Give two examples of physical changes.

Ans: Melting of ice and cutting of paper are examples of physical changes.

3. What is a chemical change?

Ans: A chemical change is a change in which one or more new substances are formed.

4. Is the burning of magnesium a physical or chemical change?

Ans: It is a chemical change.

5. What is rust?

Ans: Rust is a brown flaky substance (iron oxide) formed when iron reacts with oxygen and moisture.

6. Write one method to prevent rusting.

Ans: Galvanisation (coating iron with zinc) can prevent rusting.

7. Name the gas produced when vinegar reacts with baking soda.

Ans: Carbon dioxide.

8. What happens when carbon dioxide is passed through lime water?

Ans: Lime water turns milky due to the formation of calcium carbonate.

9. Is crystallisation a physical or chemical change?

Ans: Crystallisation is a physical change.

10. What is the color change observed when iron is dipped in copper sulphate solution?

Ans: The blue solution turns green and brown copper gets deposited on iron.

B. Fill in the Blanks:

1. Rusting of iron occurs in the presence of _______ and _______.

Ans: Oxygen, water.

2. A chemical change results in the formation of a _______ substance.

Ans: New.

3. Lime water turns milky due to the presence of _______.

Ans: Carbon dioxide.

4. The process of depositing zinc on iron is called _______.

Ans: Galvanisation.

5. Crystallisation is an example of a _______ change.

Ans: Physical.

C. True or False: 

1. Crystallisation is a chemical change.

Ans: False.

2. Burning of coal is a chemical change.

Ans: True.

3. Rust is chemically the same as iron.

Ans: False.

4. Carbon dioxide turns lime water milky.

Ans: True.

5. Cutting a sheet of paper into small pieces is a chemical change.

Ans: False.