chapter 2 - chemical level of organization Flashcards

1
Q

how many elements are in the human body?

A

26

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2
Q

what is the smallest unit of matter?

A

atom

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3
Q

what is a positively charged atom?

A

proton

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4
Q

what is a neutrally charged atom?

A

neutron

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5
Q

what is a negatively charged atom?

A

electron

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6
Q

what is a substance that dissolves into one or more hydrogen ions and one or more anions?

A

acid

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7
Q

what is a substance that dissolves into one or more hydroxide ions and one or more cations?

A

base

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8
Q

when dissolved in water, what dissociates into cations and anions?

A

salts

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9
Q

what is a pH greater than 7 considered?

A

acidic

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10
Q

what is a pH less than 7 considered?

A

alkaline

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11
Q

the number of ____ equals the number of ____.

A

electrons, protons

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12
Q

what gives up or receives electrons?

A

ions

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13
Q

what is a substance that contains atoms from two or more different elements?

A

compound

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14
Q

what is formed by atoms or molecules sharing 1, 2, or 3 pairs of their valence electrons?

A

covalent bonds

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15
Q

what is being held together by forces of attraction?

A

ionic bonds

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16
Q

what is neutral on a pH chart?

A

7

17
Q

what is the measurement of concentration of hydrogen?

A

pH