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ICSE Class 7 Chemistry Question 12 of 13

Physical and Chemical Changes — Question 4

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Question

Question 4

Fill in the blanks with the correct words for each of the statements given below:

  1. Sublimation is ............... [considered/not considered] a change of state of matter.

  2. Sublimation involves a ............... [chemical/physical] change.

  3. During sublimation a solid on heating turns directly into ............... [liquid/vapour] & on cooling back to ............... [solid/liquid].

  4. Ammonium chloride, a sublimable solid undergoes ............... [synthesis/dissociation] on heating.

  5. Sublimation of iodine is an example of ............... [physical/chemical] change.

Answer

  1. Sublimation is considered a change of state of matter.

  2. Sublimation involves a physical change.

  3. During sublimation a solid on heating turns directly into vapour & on cooling back to solid.

  4. Ammonium chloride, a sublimable solid undergoes dissociation on heating.

  5. Sublimation of iodine is an example of physical change.