Instruction
Active
Identifying Direction of Heat Flow
Scenario
Object 1
Object 2
Indicate the direction of heat flow in each scenario.
Scenario A:
Lotion at
27°C
Skin at
37°C
Scenario B:
Lasagna at
170°C
Plate at
20°C
Scenario C
Scenario D:
Ocean water at
25°C
Lava at
950°C
Eggs at
2°C
Sidewalk at
80'C

A: object 1

B: object 2

C: object 1

D: object 1

Explanation:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e