Download App

Physical and Chemical Changes — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYPhysical and Chemical Changes4 Marks
Question
Write the characteristics of physical changes.
✓

Answer

Characteristics of physical changes :
  1. Generally, the change is temporary and can be reversed by changing the conditions.
  2. No new substance is formed. So there is no change in the mass of the substance undergoing a physical change.
  3. There is no change in the chemical composition of the original substance.
  4. There may or may not be a change in the physical properties like state, shape, size or colour of the original substance.
  5. No significant change in energy is involved.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[5 Mark Question Answer]" from Physical and Chemical Changes→Physical and Chemical Changes — all question types→CHEMISTRY STD 7 question papers→ICSE Board STD 7 question papers→ICSE Board question paper generator→

Similar questions

Write the symbols and valencies of the following radicals:
(a)Magnesium iron
(b) Amonium
(c)carbonate
(d)Nitrate
(e)Oxied
(f) Bisulphate
(g) Aluminium ion
→
State four conditions necessary for a chemical reaction to take place.
→
What happenswhen an acid reacts with a base ? Explain by giving a suitable example. What is the special name for such a reaction ?
→
Name the three states of matter and define them.
→
Explain the conversion of nitrogen into nitrates during lightning.
→
Define and give one example of each :
a. Antipyretics
b. Analgesics
c. Antibiotics
d. Antiseptics
→
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

→
What is a combination reaction ? Give one example of it.
→
What is the difference between a molecule of an element and a molecule of a compound ? Give an example of each.
→
Suggest any five ways to prevent air pollution.
→