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Biology > Chapter 2.1 > Flashcards

Chapter 2.1 Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

What are living things made of?

A

Chemical compounds

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2
Q

What is the basic unit of matter?

A

The atom

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3
Q

What charge does a proton have and where is it found?

A

Positive, nucleus

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4
Q

What charge does a neutron charge have and where is it found?

A

Neutral, nucleus

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5
Q

What charge does an electron have and where is it found?

A

Negative, electron cloud

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6
Q

Where is the nucleus located?

A

The center of the atom

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7
Q

What is an element?

A

A pure substance that consists entirely of one type of atom

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8
Q

What does the atomic number mean?

A

It states the number of protons and electrons

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9
Q

What are isotopes of an element?

A

Atoms of one atom that have different numbers of neutrons

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10
Q

How are isotopes identified?

A

Their mass number

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11
Q

What is a mass number?

A

the number of protons and neutrons in the nucleus

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12
Q

Do all isotopes of an element have the same chemical properties?

A

yes

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13
Q

Why does a radioactive isotope give off radiation?

A

Its nucleus is decaying at a constant rate

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14
Q

What is a chemical compound?

A

When two or more elements combine in definite proportions

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15
Q

What is another name for chemical compound?

A

chemical formula

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16
Q

Are chemical properties of a compound the same or different from the pure elements from which it formed?

A

Different

17
Q

How are the atoms held together in a compound?

A

Chemical bonds

18
Q

What are the two main types of chemical bonds?

A

Ionic and covalent

19
Q

What are ions?

A

Positively and negatively charged ions

20
Q

What are molecules?

A

The smallest unit of most compounds that result from atoms joined by covalent bonds

21
Q

What are van der Waal forces?

A

When intermolecular forces of attraction between oppositely charged regions of nearby molecules occurs. They are not as strong as ionic or covalent forces, but can hold large molecules together

Biology (7 decks)

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