Chemistry
Fill in the blanks with the correct words for each of the statements given below:
Sublimation is …………… [considered/not considered] a change of state of matter.
Sublimation involves a …………… [chemical/physical] change.
During sublimation a solid on heating turns directly into …………… [liquid/vapour] & on cooling back to …………… [solid/liquid].
Ammonium chloride, a sublimable solid undergoes …………… [synthesis/dissociation] on heating.
Sublimation of iodine is an example of …………… [physical/chemical] change.
Answer
Sublimation is considered a change of state of matter.
Sublimation involves a physical change.
During sublimation a solid on heating turns directly into vapour & on cooling back to solid.
Ammonium chloride, a sublimable solid undergoes dissociation on heating.
Sublimation of iodine is an example of physical change.
Related Questions
Fill in the blanks with the appropriate words for each of the statements given below:
Germination of seeds is considered a …………… [physical/chemical] change.
If a change is permanent and irreversible, it is considered a …………… [chemical/physical] change.
Heating a piece of iron is considered a …………… [physical/chemical] change, while heating a piece of coal [carbon] is considered a …………… [physical/chemical] change.
Chemical changes may involve exchange of energy in the form of …………… & …………… [light/sound/magnetic /heat].
Change of milk to curd is a …………… [desirable/undesirable] change.
State whether the following statements are true or false. If false, write- the correct statement.
Desirable changes are meaningful, while undesirable changes are unfavorable.
During physical changes, the composition of the original substance is not altered, but the properties of the original substance are altered.
During a chemical change the composition of the original substance is not altered, and the change is irreversible.
Melting of butter and wax are examples of chemical changes.
The melting of ice is an exothermic, irreversible chemical change.
Match the examples of changes in List I with the correct type in List II.
List I List II 1. Expansion of a steel rod on heating A. Physical 2. Rotting of eggs B. Chemical 3. Milk turning sour 4. Tarnishing of copper 5. Separation of naphthalene from a mixture of naphthalene & sodium chloride Name the following.
The product/s obtained during 'photosynthesis' — which is a chemical change.
The term involved in the change of state from — 'water to ice' – which is a physical change.
The final product of the physical change involved during — 'melting of a piece of wax'.
The type of change i.e., physical or chemical involved — 'during respiration in human beings.'
The type of change i.e., physical or chemical involved — 'when a substance undergoes a change in state, colour, or size'.