chapter 2 - chemical level of organization

Question 1

how many elements are in the human body?

Answer 1

26

Question 2

what is the smallest unit of matter?

Answer 2

atom

Question 3

what is a positively charged atom?

Answer 3

proton

Question 4

what is a neutrally charged atom?

Answer 4

neutron

Question 5

what is a negatively charged atom?

Answer 5

electron

Question 6

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

Answer 6

acid

Question 7

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

Answer 7

base

Question 8

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

Answer 8

salts

Question 9

what is a pH greater than 7 considered?

Answer 9

acidic

Question 10

what is a pH less than 7 considered?

Answer 10

alkaline

Question 11

the number of ____ equals the number of ____.

Answer 11

electrons, protons

Question 12

what gives up or receives electrons?

Answer 12

ions

Question 13

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

Answer 13

compound

Question 14

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

Answer 14

covalent bonds

Question 15

what is being held together by forces of attraction?

Answer 15

ionic bonds

Question 16

what is neutral on a pH chart?

Answer 16

7

Question 17

what is the measurement of concentration of hydrogen?

Answer 17

pH