Question

using science skills
use the figure below to answer questions 23, 24 and 25

1. inferring what change of state is taking place?

a. liquid to gas
b. gas to liquid
c. solid to liquid

1. inferring what forms of energy are shown?

a. electrical and thermal
b. electromagnetic and thermal
c. chemical and thermal

1. applying concepts what kind of chemical change is shown?

a. tarnishing
b. oxidation
c. combustion

Explanation:

• For question 23, the steam coming out of the pot indicates a liquid - water is changing to a gas - water vapor, which is evaporation (liquid to gas).
• For question 24, the gas stove uses chemical energy from the gas and converts it to thermal energy to heat the pot, so chemical and thermal energy are shown.
• For question 25, the burning of gas on the stove is a combustion reaction where a fuel (gas) reacts with oxygen to produce heat and other products.

Answer:

1. a. liquid to gas
2. c. chemical and thermal
3. c. combustion