acids and bases

Question 1

exothermic reactions (meaning and example)

Answer 1

releasing heat or energy

lighting a match

Question 2

endothermic reactions (meaning and example)

Answer 2

energy is absorbed

ice pack

Question 3

why is photosynthesis an endothermic reaction

Answer 3

plant cells absorb energy from the sun

Question 4

name 3 acids

Answer 4

hydrochloric acid, nitric acid, carbonic acid

Question 5

name 3 bases

Answer 5

calcium hydroxide, sodium hydroxide, ammonia

Question 6

acid (meaning)

Answer 6

substance that releases hydrogen ions into water

Question 7

base (meaning)

Answer 7

substance that releases hydroxide ions into water

Question 8

3 properties of an acid

Answer 8

conduct electricity, sour taste, turn blue litmus paper red

Question 9

3 properties of base

Answer 9

have soapy slimy feel, bitter taste, turn red litmus paper blue

Question 10

pH (meaning)

Answer 10

scale measures concentration of hydrogen

Question 11

1-7 on a pH scale is what?

Answer 11

acidic

Question 12

7-14 on a pH scale is what

Answer 12

base & alkaline