Take pieces of wax in a bowl and heat them on a candle or spirit lamp. What was the initial state of wax?
Important Questions on Substances in the Surroundings - Their States and Properties
Take pieces of wax in a bowl and heat them on a candle or spirit lamp. What did it get converted into?
(Choose one of the following: Liquid wax/ Remains same/ Wax vaporiser).
Spirit, camphor, petrol, ghee, coconut oil, naphthalene balls, ammonium chloride(navsagar).
Which ones freeze in winter from the given list of substances?
List of substances:- Spirit, camphor, petrol, ghee, coconut oil, naphthalene balls, ammonium chloride(navsagar).
Which liquid have you seen change into vapour from the given list of substances?
List of substances: Spirit, camphor, petrol, ghee, coconut oil, naphthalene balls, ammonium chloride(navsagar).
Which solids directly change into the gaseous state from the given list of substances?
The chart given below shows the boiling point and freezing point of some substances. State whether these substances are solid, liquid or gaseous at room temperature?
| Substance | Freezing point | Boiling point |
| Candle | ||
| Plastic | ||
| Iron |
Take some sand in the crucible. Put few iodine crystals in it. Place the crucible on tripod to heat it. Block the stem of the funnel with a cotton plug and place it inverted on the crucible. Light the burner and heat the mixture in the crucible. Observe the changes. Why does this happen?
