Unit 2 Checklist

Question 1

Define elements

Answer 1

Chemical building blocks that make up matter

Question 2

Define matter

Answer 2

Anything that has mass and occupies space

Question 3

Define atom

Answer 3

Smallest unit of matter; enter into chemical reactions

Question 4

4 elements that make up 96% of the human body?

Answer 4

C, H, O, N

Question 5

2 elements that make up 3% of the human body

Answer 5

Sulfur + Phosphorus

Question 6

Where are sulfur and phosphorus found most commonly in the human body

Answer 6

DNA
RNA
Nucleic Acid

Question 7

How many elements are in the human body?

Answer 7

26

Question 8

How many elements make up 1% of the human body?

Answer 8

20

Question 9

How many elements are in known existence?

Answer 9

122

Question 10

How many of the elements are naturally occurring?

Answer 10

98

Question 11

_______ of matter composed of the same ____

Answer 11

Quantity of mates composed of the same atoms

Question 12

Basic components of the atom

Answer 12

Nucleus
Protons
Neutrons
Elections

Question 13

2 basic parts of the atom

Answer 13

Nucleus

Electron cloud

Question 14

Protons: charge, # of protons = ?

Answer 14

Positive charge 
# of protons = element's atomic number

Question 15

Neutrons: charge

Answer 15

Uncharged, but if they ever are, it’s positive

Question 16

Element’s atomic weight is

Answer 16

of protons and # of neurons

Question 17

Overall charge of nucleus is..?

Answer 17

Positive

Question 18

What are the states of matter

Answer 18

Solid
Liquid
Gas