Advertisements
Advertisements
Question
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Advertisements
Solution
The crystallisation of salt from its solution is a PHYSICAL change as only state changes (crystals are formed), the composition does not change, is reversible, no change in mass takes place.
APPEARS IN
RELATED QUESTIONS
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
How do you say that the process of digestion is a chemical change ?
True or false
Dissolving of a solid in liquid is a physical change.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
When ice melts to form water, change occurs in its
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
What kind of change is shown by tearing of paper?
Keeping a stone in sunlight for few hours is ______.
