A $75 g$ ice cube is mixed to $450 g$ of boiling water. Identify the reasons why the water stops boiling immediately:
I. Heat is melting the ice.
II. Condensation is occurring.
III. Phase change occurs

I only

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II only

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I and III only

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II and III only

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I, II, and III

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Solution

The correct option is E I and III only
As the ice converted into water so there will occur phase change. The heat energy of the boiling water will help to melt the ice and heat energy decreases so boiling will stop . Thus I and III will correct.

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Question 2

Define the following terms:

(i) Melting

(ii) Boiling

(iii) Boiling point

(iv) Condensation

Classify the following as physical or chemical changes:

(i) Cooking of food (ii) Boiling of water

(iii) Cutting of trees (iv) Dissolving salt in water

(v) Digestion of food (vi) Melting of ice

Q. When water is heated at its boiling point or melting point, its temperature does not change.
a) What is meant by boiling point and melting point?
b) What are the boiling and freezing points of water?
c) Why is there no change in temperature?

Question 12

Which of the following is (are) an endothermic process(es)?

(i) Dilution of sulphuric acid.
(ii) Sublimation of dry ice.
(iii) Condensation of water vapours.
(iv) Evaporation of water.

(a) (i) and (iii)
(b) (ii) only
(c) (iii) only
(d) (ii) and (iv)

Q. State whether the following statements are true or false. Rewrite the false ones correctly.
(a) All irreversible changes are chemical changes.
(b) A liquid can sublime.
(c) The evaporation of water take place only at 100°C. when it is boiling.
(d) The melting of ice is a physical change.
(e) The souring of milk is a periodic change.
(f) The flowering of trees is a periodic change.
(g) Solidification and condensation are the same.
(h) The breaking of glass tumbler is a chemical change because it is irreversible.
(i) Boiling, evaporation and condensation are physical changes.

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A 75g ice cube is mixed to 450g of boiling water. Identify the reasons why the water stops boiling immediately:I. Heat is melting the ice.II. Condensation is occurring.III. Phase change occurs

The correct option is E I and III onlyAs the ice converted into water so there will occur phase change. The heat energy of the boiling water will help to melt the ice and heat energy decreases so boiling will stop . Thus I and III will correct.

A $75 g$ ice cube is mixed to $450 g$ of boiling water. Identify the reasons why the water stops boiling immediately:
I. Heat is melting the ice.
II. Condensation is occurring.
III. Phase change occurs

The correct option is E I and III only
As the ice converted into water so there will occur phase change. The heat energy of the boiling water will help to melt the ice and heat energy decreases so boiling will stop . Thus I and III will correct.