Unit 2 Checklist Flashcards

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1
Q

Define elements

A

Chemical building blocks that make up matter

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2
Q

Define matter

A

Anything that has mass and occupies space

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3
Q

Define atom

A

Smallest unit of matter; enter into chemical reactions

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4
Q

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

A

C, H, O, N

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5
Q

2 elements that make up 3% of the human body

A

Sulfur + Phosphorus

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6
Q

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

A

DNA
RNA
Nucleic Acid

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7
Q

How many elements are in the human body?

A

26

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8
Q

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

A

20

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9
Q

How many elements are in known existence?

A

122

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10
Q

How many of the elements are naturally occurring?

A

98

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11
Q

_______ of matter composed of the same ____

A

Quantity of mates composed of the same atoms

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12
Q

Basic components of the atom

A

Nucleus
Protons
Neutrons
Elections

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13
Q

2 basic parts of the atom

A

Nucleus

Electron cloud

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14
Q

Protons: charge, # of protons = ?

A
Positive charge 
# of protons = element's atomic number
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15
Q

Neutrons: charge

A

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

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16
Q

Element’s atomic weight is

A

of protons and # of neurons

17
Q

Overall charge of nucleus is..?

A

Positive

18
Q

What are the states of matter

A

Solid
Liquid
Gas