Ch. 2 - Nature of Molecules Flashcards

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1
Q

What is matter?

A

Anything that has mass and occupies space

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2
Q

What is a substance that cannot be broken down?

A

Element

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3
Q

What are the three components that make up an atom?

A

Protons, Neutrons, and Electrons

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4
Q

What does the atomic number of an element represent?

A

The number of protons

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5
Q

How do you calculate the atomic mass of an element?

A

Take the sum of the # of protons and the # of neutrons

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6
Q

What are atoms of the same elements called when they have a different amount of neutrons?

A

Isotopes

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7
Q

What are radioactive isotopes most commonly used for?

A

Tracking molecules in chemical reactions

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8
Q

What is half-life?

A

The amount of time it takes for one-half of the atoms in a sample to decay

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9
Q

What are the most common elements that the human body is composed of?

A

Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorous, and Sulfur

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10
Q

The rows on the periodic table are called what?

A

Periods

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11
Q

The columns on the periodic table are called what?

A

Groups

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12
Q

What are the outer-most electrons called on the Bohr Model?

A

Valance electrons

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13
Q

How many valance electrons are nonreactive elements going to have?

A

Eight

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14
Q

What is the Octet rule?

A

Atoms are going to be the most stable when they have eight electrons in their valance shell

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15
Q
A
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