Class 7

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

Shanaya

Asked: November 23, 2020In: Class 7 Science

Fill in the blanks: Changes in which only _________ properties of a substance change are called physical 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: d

Shanaya

Asked: November 23, 2020In: Class 7 Science

Fill in the blanks: Two methods by which rusting of iron can be prevented are _ and _.

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: c

Shanaya

Asked: November 23, 2020In: Class 7 Science

Fill in the blanks: The chemical name of baking soda is _________.

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: b

Shanaya

Asked: November 23, 2020In: Class 7 Science

Fill in the blanks: When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.

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: a

Shanaya

Asked: November 23, 2020In: Class 7 Science

Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating Aluminium to make Aluminium foil (f) Digestion of food

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: 1

Harshita Patel

Asked: November 23, 2020In: Class 7 Science

Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

NCERT Solutions for Class 7 Science Chapter 5 Important NCERT Questions 7th Chapter 5 Acids, Bases and Salts NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 10

Harshita Patel

Asked: November 23, 2020In: Class 7 Science

Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.

NCERT Solutions for Class 7 Science Chapter 5 Important NCERT Questions 7th Chapter 5 Acids, Bases and Salts NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 9

Harshita Patel

Asked: November 23, 2020In: Class 7 Science

Explain why: Factory waste is neutralized before disposing it into the water bodies.

NCERT Solutions for Class 7 Science Chapter 5 Important NCERT Questions 7th Chapter 5 Acids, Bases and Salts NCERT Books for Session 2022-2023 CBSE Board and State Board Questions No: 8 part: c

Category: Class 7

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.

Fill in the blanks: Changes in which only _________ properties of a substance change are called physical changes.

Fill in the blanks: Two methods by which rusting of iron can be prevented are _ and _.

Fill in the blanks: The chemical name of baking soda is _________.

Fill in the blanks: When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.

Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating Aluminium to make Aluminium foil (f) Digestion of food

Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.

Explain why: Factory waste is neutralized before disposing it into the water bodies.

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