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Chemical Reactions and Equations Chapter 1

18 Questions

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Chemical Reactions and Equations Chapter 1

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Questions and Answers

What happens to the initial substance in the situations mentioned in the chapter?

It disappears completely

It becomes heavier

Its nature and identity change (correct)

It remains the same

What is the term used to describe the process of a chemical change occurring?

Biological reaction

Physical change

Physical reaction

Chemical reaction (correct)

What is the purpose of Activity 1.1?

To show the properties of magnesium

To demonstrate a chemical reaction (correct)

To show the properties of sandpaper

To demonstrate a physical change

What is the safety precaution mentioned in Activity 1.1?

Wear suitable eyeglasses (C) Signup and view all the answers

What is the purpose of burning the magnesium ribbon in Activity 1.1?

To demonstrate a chemical reaction (C) Signup and view all the answers

What is collected in a watch-glass in Activity 1.1?

Ash (D) Signup and view all the answers

What is used to clean the magnesium ribbon in Activity 1.1?

Sandpaper (B) Signup and view all the answers

What is used to hold the magnesium ribbon in Activity 1.1?

Tongs (B) Signup and view all the answers

What is the length of the magnesium ribbon used in Activity 1.1?

3-4 cm (C) Signup and view all the answers

What is the common outcome in the given daily life situations?

The substance undergoes a chemical change (B) Signup and view all the answers

What is the significance of burning the magnesium ribbon in Activity 1.1?

To demonstrate a chemical change (C) Signup and view all the answers

What is the primary goal of performing Activity 1.1?

To learn about chemical changes (D) Signup and view all the answers

Why is it necessary to keep the burning magnesium ribbon away from the eyes?

To avoid the intense light (B) Signup and view all the answers

What is the importance of rubbing the magnesium ribbon with sandpaper?

To clean the ribbon (C) Signup and view all the answers

What is the outcome of the burning of magnesium ribbon?

Formation of magnesium oxide (A) Signup and view all the answers

What is the role of the watch-glass in Activity 1.1?

To collect the ash formed (C) Signup and view all the answers

Why do we say that a chemical reaction has taken place in the given daily life situations?

Because the substance undergoes a change in its chemical composition (C) Signup and view all the answers

What is the significance of the teacher's assistance in Activity 1.1?

To ensure the safety of the students (C) Signup and view all the answers