Chapter 2

Question 1

What is matter ?

Answer 1

Anything that occupies space and has mass

Question 2

What are the 3 physical states of matter?

Answer 2

Solid , liquid, gas

Question 3

What are the most common elements found in humans?

Answer 3

1. Oxygen 65%
2. Carbon 18%
3. Hydrogen 10%
4. Nitrogen 3%

Question 4

Are trace elements important ?

Answer 4

Yes, because they are often used as catalysts in enzyme systems.

Question 5

What is the difference between Organic and inorganic compounds ?

Answer 5

Organic compounds always contain carbon and hydrogen. Inorganic compounds only contain carbon

Question 6

What are subatomic particles of an ATOM?

Answer 6

Protons, neutrons and electrons

Question 7

Radioactive Isotopes

Answer 7

Good : They are used in radiography
Bad : they can cause illness and death

Question 8

What does the Bohr Odell say about the electron shell ?

Answer 8

Electrons first occupy the shell that is closest to nucleus with lowest energy

Question 9

What do the electrons determine ?

Answer 9

Number of protons inside the nucleus

Question 10

What are 3 type of chemical bonds

Answer 10

1. Covalent bonds
2. Non Polar convalent bonds
3. Hydrogen bonds

Question 11

What’s the difference between an acid and a base?

Answer 11

An acid produces hydrogen ions
A base accepts hydrogen ions