7. Which event is an example of an exothermic reaction?

Question

a
combustion
b
melting ice
c
decomposition
d
evaporation

Match each description of each picture to its correct type of matter.

Column A
State of matter where particles can slide past one another
State of matter where particles move freely within their container
State of matter where particles are packed tightly

Column B
A) Liquid
B) Solid
C) Gas

Answer 1

For your first question:

7. The event that is an example of an exothermic reaction is: a) combustion

Combustion is a chemical reaction that typically releases heat and light, which is characteristic of exothermic reactions.

Now, for the match between descriptions and types of matter:

Column A

• State of matter where particles can slide past one another - A) Liquid
• State of matter where particles move freely within their container - C) Gas
• State of matter where particles are packed tightly - B) Solid

So the matches are:

• A (Liquid)
• C (Gas)
• B (Solid)