Question

7 a balloon filled with room temperature air and then put in a sunny place expands slightly due to a rise in temperature. this is due to the molecules of air moving faster light green increasing in number purple increasing in density red 8 sunlight heating the interior of a car on a sunny day is an example of conduction orange convection red radiation dark blue

Explanation:

Step1: Analyze question 7

When temperature rises, gas molecules gain kinetic energy and move faster. The number of molecules doesn't change (balloon is sealed), and density \(d=\frac{m}{V}\), mass \(m\) is constant, \(V\) increases (balloon expands), so density decreases.

Step2: Analyze question 8

Conduction is heat transfer through direct contact. Convection is heat transfer through fluid (liquid or gas) movement. Radiation is heat transfer via electromagnetic waves. Sunlight (electromagnetic waves) heats the car interior - it's radiation.

Answer:

1. LIGHT GREEN; 8. DARK BLUE