chemical changes 🍁

Question 1

what is the reaction between a metal and oxygen called and what is produced?

Answer 1

1) oxidation
2) metal oxide

Question 2

what are reduction and oxidation reactions? (in terms of oxygen NOT electrons)

Answer 2

reduction- loss of oxygen
oxidation- gain of oxygen

Question 3

what is the reactivity series?

Answer 3

a chart showing the reactivity of metals, from most reactive to least

Question 4

what determines the reactivity of a metal?

Answer 4

its tendency to form positive ions when reacting with other substances

Question 5

what are the only non-metals in the reactivity series?

Answer 5

hydrogen and carbon

Question 6

recall the reactivity series (in order, including hydrogen and carbon).

hint: 15 elements

Answer 6

potassium
sodium
lithium
calcium
magnesium
aluminium
carbon
zinc
iron
tin
lead
hydrogen
copper
silver
gold

Question 7

what is a displacement reaction?

Answer 7

when a more reactive element displaces a less reactive element in a compound

Question 8

how do potassium, sodium, lithium and calcium react with (cold) water and acid?

Answer 8

violently/rapidly, but slower as the list goes on

Question 9

how do magnesium and aluminium react with (cold) water and acid?

Answer 9

water- slowly
acid- rapidly

Question 10

how do zinc and iron react with (cold) water and acid?

Answer 10

water- no reaction OR (iron) slow rusting
acid- slowly

Question 11

how do copper, silver and gold react with (cold) water and acid?

Answer 11

no reaction at all

Question 12

what are the products when water and metals react?

Answer 12

metal hydroxide + hydrogen

Question 13

what are ores?

Answer 13

all metals (excluding gold, silver and platinum) are found as compounds (ores) due to their high reactivity

Question 14

how are ores extracted? (2 ways)

Answer 14

1) metals more reactive than carbon- electrolysis
2) metals less reactive than carbon- reduction