Compare the Energy Changes Involved During a Physical and a Chemical Change. - Chemistry

Compare the energy changes involved during a physical and a chemical change.

Short Note

Physical change: No gain or loss of energy during physical change.
The energy required for completion of a physical change is released when the change is reversed.
Chemical change: Energy is either absorbed or evolved during the chemical change.
The energy in the form of light, percussion (pressure), or generally heat energy is required for a chemical change.

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Chapter 2: Physical & Chemical Changes - Exercises

Chapter 2 Physical & Chemical Changes
Exercises | Q 1.5

Write short answer.

Sublimation is classified as a physical change. Why ?

State three differences between evaporation and boiling

Write true or false

Burning of sugar is a temporary change.

Match the columns.

Column A	Column B
1. a change which cannot be easily reversed	a. man-made change
2 a change that repeats itself at regular intervals	b. chemical chang
3. a change that is made by humans	c. physical change
4. a change in which the original substance cannot be obtained	d. periodic change
5. a change where no new substance is formed	e. irreversible change
	f . slow change

Name two reversible changes.

Given reason:

Cutting of a cloth piece is a physical change, though it cannot be reversed.

Fill in the blank with the appropriate word of the statement given below:

Germination of seeds is considered a __________ change.

______ is the substance that is dissolved in a solvent.

A physical change is generally____________.

Which of the following is not a physical change?