Activity No. 1.2 Consider activity guides no 1 and 2 study first the given table and scenario
SAMPLES
Table 1 Hoiling point of tuo liquid samples
Temperature in C
Before After 5 After 8 After 10 After 12 After 14 Alter 16
heating minutes minutes minutes minuten minutes minutes
00
100 100 100
Liquid A
07
105
108
Liquid D
Scenario 1 Melting pom of two solid samples
Cher Matt and his assistant observed two solid samples: Solid A and Solid D. Both
substances are white crystalline powder. They cannot determine which is a substance
and mixture just by looking at it. So, to distinguish which is which they heated the two
samples using an improvised melting dish. Both the two samples were heated at the
same time and received an equal amount of heat. Aner a few minutes, they had observed
that Solid A melts completely within a short period of time, while Solid B has portions
that seem to be not melting
To find out if you have understood the important concepts of the lesson, answer
the following questions below
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?
Scenano l: Melting point of two solid samples
Samples Appearance Observation while melting
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 melts completely
smoothly within a short time