Test 2 Unit 3

Question 1

What are the different levels of energy of electrons inside an atom?

Answer 1

1. First energy: lowest, closest to nucleus
2. Second energy
3. Third energy: highest, furthest from nucleus

Question 2

Which contains more potential energy, Oxygen or Carbon?

Answer 2

Carbon! less electronegative atoms hold their electrons less tightly to their nucleus

Question 3

What is the relationship between the proximity of an electron and its nucleus and the potential energy?

Answer 3

The farther away an electron is from the nucleus of an atom the greater potential energy that electron possesses

Question 4

What are the 3 kinds of systems?

Answer 4

1. Isolated system
2. Closed system
3. Open system

Question 5

Explain and give an example of an isolated system.

Answer 5

Very little energy or matter is exchanged with the environment.
ex: The Universe.

Question 6

Explain and give an example of an closed system.

Answer 6

Energy is exchanged with the environment, but no matter.

ex: Earth, saucepan with a lid.

Question 7

Explain and give an example of an open system.

Answer 7

Energy and matter are exchanged with the environment.

ex: Ocean, all living beings.