Question

1. Which liquid sample is a pure substance?

Table 1: Boiling point of two liquid samples

Samples Temperature Observation while heating

Liquid A

Liquid B

2. Which solid sample is a pure substance?

Scenario 1: Melting point of two solid samples

Samples Appearance Observation while melting

Solid A

Solid B​

Answer 1

Answer:

Solid A

Solid B

During boiling, the temperature of a substance changes at the start then it

becomes the same and constant. During melting, a substance melt completely/

smoothly within a short time.

Hope it helps uu..

Answer 2

pure substance

Explanation:

Pure substance is any homogeneous mixture. That is its matter that uniforms in appearance and composition, regardless of how small the sample size.

1)

Liquid A:

• 28-100,  which is fixed completely

Liquid B:

• 30-113, which is not fixed at all

2)

Solid A and Solid B, Both substances are white crystalline powder.

Solid A:

• It is a homogeneous substance that totally melts.
• Solid A melts completely within a short period of time

Solid B:

• Solid B has portions that seem to be not melting.

hence, these are the required observations