Exam 1-Exercise 2 Flashcards

1
Q

One type of atom, can’t be decomposed

A

Element

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2
Q

More than one type of atom/element;CAN be decomposed

A

Compound

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3
Q

What are the elements that are most abundant in living things?

A

CHONPS;Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulfur

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4
Q

What is a proton?

A

Positively charged

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5
Q

Atomic number=

A

Number of protons

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6
Q

Mass number-Atomic number=

A

Number of nutrons

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7
Q

What is an isotope?

A

Atoms of same element that have different number of neutrons

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8
Q

How are isotopes important?

A

Chemical and biological research, medicine

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9
Q

How many electrons can the first shell hold?

A

2

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10
Q

How many electrons are in the valance shell?

A

8

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11
Q

What is the valance shell?

A

Outermost shell

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12
Q

What is the octet rule?

A

Atoms want to have 8 electrons in the outermost shell

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13
Q

Bonds between atoms that involves the sharing of a pair of electrons

A

Covalent bond

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14
Q

What is the maximum number of covalent bonds formed by an atom of hydrogen,oxygen, nitrogen, and carbon?

A

H-1
O-2
N-3
C-4

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15
Q

what reaction is it when atoms/molecules are put together to make larger molecules

A

Synthesis Reactions

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16
Q

Molecules are broken down to smaller molecules/atoms

A

Decomposition reaction

17
Q

Atoms swap partners

A

Exchange reactions

18
Q

What is a salt?

A

Ionic compounds that do not include either H+ or OH-

19
Q

What are electrolytes?

A

Solutions that contain ions

20
Q

pH<7

A

Acid

21
Q

pH>7

A

Base

22
Q

pH=7

A

Neutral

23
Q

What is a buffer

A

The ability to resist changes in pH.