Question

10. Conduction is most effective in liquids and gases.
True
False


11. Convection is most effective in liquids and gases.
True
False


12. Review the examples below. Which would be considered an example of convection.

a
a glass of water on a counter at room temperature
b
boiling water on a hot stove
c
sunlight warming your face
d
sea breeze moving from the warm beach to the ocean


13. Which type material allows heat and electricity to flow freely?

a
resistor
b
insulator
c
conductor
d
non-conductor


14. Materials that do not allow heat and electricity to flow easily are...

a
nonconductors
b
insulators
c
conductors
d
resistors


15. Metal and _____________________ are considered conductors.

a
rubber
b
water
c
silk
d
air


16. Glass and ________________ can be considered insulators. (select all correct responses)

a
silk
b
rubber
c
copper
d
air

Answer 1

Here are the answers to your questions:

**10. Conduction is most effective in liquids and gases.**
- **Answer: False**
Conduction is most effective in solids, especially metals.

**11. Convection is most effective in liquids and gases.**
- **Answer: True**
Convection involves the movement of fluid (liquid or gas) and is indeed most effective in these states of matter.

**12. Review the examples below. Which would be considered an example of convection.**
- **Answer: b (boiling water on a hot stove)**
Boiling water involves the movement of water due to differences in temperature and density, which is a characteristic of convection.

**13. Which type of material allows heat and electricity to flow freely?**
- **Answer: c (conductor)**
Conductors allow heat and electricity to flow freely.

**14. Materials that do not allow heat and electricity to flow easily are...**
- **Answer: b (insulators)**
Insulators impede the flow of heat and electricity.

**15. Metal and _____________________ are considered conductors.**
- **Answer: b (water)**
Water (especially when it contains impurities) can conduct electricity, although to a lesser extent than metals.

**16. Glass and ________________ can be considered insulators. (select all correct responses)**
- **Answers: a (silk), b (rubber), d (air)**
All of these materials—silk, rubber, and air—can act as insulators. Copper (c) is a conductor, not an insulator.