Tiwari Academy Discussion

Poll

Shanaya

Asked: November 23, 2020In: Class 7 Science

Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 12

Poll

Shanaya

Asked: November 23, 2020In: Class 7 Science

The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exist as a liquid. When it comes out from the cylinder it becomes a gas (Change – A) then it burns (Change – B). The following statements pertain to these changes. Choose the correct one.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 11

Shanaya

Asked: November 23, 2020In: Class 7 Science

Explain why rusting of iron objects is faster in coastal areas than in deserts.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 10

Shanaya

Asked: November 23, 2020In: Class 7 Science

Explain how painting of an iron gate prevents it from rusting.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 9

Shanaya

Asked: November 23, 2020In: Class 7 Science

Describe how crystals of copper sulphate are prepared.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 8

Shanaya

Asked: November 23, 2020In: Class 7 Science

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 7

Shanaya

Asked: November 23, 2020In: Class 7 Science

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 5

Shanaya

Asked: November 23, 2020In: Class 7 Science

How would you show that setting of curd is a chemical change?

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 6

Shanaya

Asked: November 23, 2020In: Class 7 Science

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 4

Shanaya

Asked: November 23, 2020In: Class 7 Science

Fill in the blanks: Changes in which new substances are formed are called _________ changes.

NCERT Solutions for Class 7 Science Chapter 6 Important NCERT Questions 7th Chapter 6 Physical and Chemical Changes NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 3 Part: e

Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.

The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exist as a liquid. When it comes out from the cylinder it becomes a gas (Change – A) then it burns (Change – B). The following statements pertain to these changes. Choose the correct one.

Explain why rusting of iron objects is faster in coastal areas than in deserts.

Explain how painting of an iron gate prevents it from rusting.

Describe how crystals of copper sulphate are prepared.

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

How would you show that setting of curd is a chemical change?

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

Fill in the blanks: Changes in which new substances are formed are called _________ changes.

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