Tag: physical changes

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Multiple choice chemistry change around us physical changes changes and their classification physical changes

If the substance is expanded on melting, the melting point ______ when the pressure is increased.

  1. increases

  2. decreases

  3. remains same

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If the substance is expanded on melting, the melting point increases when the pressure is increased, because in increased pressure substance try to be in a state where volume decreases.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

You are presented with three bottles $A, B, C$ each containing a different liquid. Bottles are labeled as follows:
Bottle $A$: ionic compound - Boiling point $30^{\circ}C$
Bottle $B$: molecular compound - Boiling point $29.2^{\circ}C$
Bottle $C$: molecular compound - Boiling point $67.1^{\circ}C$
Choose the correct statement.

  1. The compound most likely to be incorrectly identified is bottle $A$
  2. The substance in bottle $B$ has stronger intermolecular attractions
  3. The substance in bottle $C$ is highly volatile
  4. A pure aqueous solution of the compound in a bottle $B$ is a good conductor of electricity among the three
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since ionic compound has the much higher boiling point than a molecular compound. This is due to stronger intermolecular attraction.

Hence Bottle A is incorrectly identified, it should not be an ionic compound.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

A filler is a substance added to make a material less expensive, or for:

  1. Changing its acidity

  2. Changing its physical properties

  3. Reducing its chemical activity

  4. Increasing its anti-rusting power
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A filter is a substance added to make a material less expensive or for changing its physical properties.

Filter are added to alter and improve the physical and mechanical properties of plastics it does not affect the structure arrangement of substance.