C5 chemical changes

Question 1

what is oxidation

Answer 1

loss of electrons

Question 2

what is reduction

Answer 2

gain of electrons

Question 3

what is produced when metals react with oxygen

Answer 3

metal oxide

Question 4

what is the reactivity series

Answer 4

please stop calling me a careless zebra, instead try learning how copper saves gold

Question 5

what is a displacement reaction

Answer 5

when a more reactive metal displaces a less reactive metal

Question 6

how are unreactive metals found

Answer 6

in the earth as an ore

Question 7

how can metals less reactive than carbon be extracted

Answer 7

reduction with carbon

Question 8

what do acids produce when reacting with some metals

Answer 8

salts and hydrogen

Question 9

what happens when substances dissolve in water

Answer 9

they dissociate into individual ions

Question 10

what ions make solutions alkaline

Answer 10

OH minus

Question 11

what ions make solutions acidic

Answer 11

H+

Question 12

what pH is neutral

Answer 12

7

Question 13

name two indicators

Answer 13

litmus paper
universal indicator

Question 14

what is the pH scale

Answer 14

0 to 14, is a measure of the acidity or alkalinity of a solution, and can be measured using universal indicator or a pH probe

Question 15

what happen in a neutralization reaction

Answer 15

hydrogen ions react with hydroxide ions to produce water

Question 16

what are strong acids

Answer 16

they are completely ionized