finals 1

Question 1

what happens if you mix a metal with one or more elements

Answer 1

you can change its properties

Question 2

alloy:

Answer 2

mixture of metal with other elements

Question 3

how are the properties of metals improved

Answer 3

mixing

Question 4

what are the most chemical reactions of metals

Answer 4

with oxygen water and acids

Question 5

difference between a physical and chemical property

Answer 5

physical: deals with the appearance and aspects of metal
chemical: deals with the reaction and rate of reaction

Question 6

elaborate on the reaction of metal and oxygen

Answer 6

metals react with oxygen. the shiny surface of the metal becomes dull and this is caused by the slow chemical reaction between the metal surface and oxygen. there is one product: a surface coating of the metal oxide

Question 7

activation energy

Answer 7

necessary energy for starting a reaction

Question 8

e.g of activation energy

Answer 8

heating

Question 9

what is magnesium used for

Answer 9

flash bulbs and distress flares

Question 10

what are gold and platinum ideal for

Answer 10

making jewelry because they dont react with oxygen so they stay shiny

Question 11

what are the products of potassium sodium or calcium with cold water

Answer 11

metal hydroxide and hydrogen gas

Question 12

what does heating do to a reaction

Answer 12

increases the rate of the reaction

Question 13

why are potassium and sodium stored under oil

Answer 13

they are so reactive and this prevents them from coming in contact with water and oxygen so they stay longer

Question 14

why is copper a good choice of metal for hot water pipes

Answer 14

it doesnt react with boiling water and is cheaper

Question 15

reactivity series

Answer 15

the list of metals in order of how quickly they react

Question 16

what can the reactivity series be used for

Answer 16

to make predictions about other reactions of metals

Question 17

e.g of chemical reaction

Answer 17

iron nail is placed in a solution of copper sulphate

Question 18

displacement reaction

Answer 18

when a higher reactive metal eliminates the other metal in a combination

Question 19

when does a displacement reaction occur

Answer 19

when the metal being added is more reactive than the metal in the salt solution

Question 20

thermit reaction

Answer 20

a reaction that’s very fast and gives out alot of heat

Question 21

decomposition reaction

Answer 21

a reaction in which heat breaks down compounds

Question 22

why are some metals found in compounds

Answer 22

they are more reactive and react with substances around them

Question 23

e.g of why metals are found in compounds

Answer 23

most metals react with oxygen and sulfur forming metal oxides and sulphides

Question 24

what do most ores contain

Answer 24

oxide sulphide or carbonate of the metal oxides

Question 25

native metal

Answer 25

metal thats found uncombined in nature

Question 26

e.g of a native metal

Answer 26

platinum and silver

Question 27

ore

Answer 27

a rock from which metals can be extracted from

Question 28

mention three ores with the metal that gets extracted from it

Answer 28

haematite --> iron (oxide) bauxite --> aluminum (oxide) galena --> lead (oxide)

Question 29

why is the extraction of metal considered a reduction reaction

Answer 29

the ore is reduced to release to metal

Question 30

two steps for obtaining a metal from its ore

Answer 30

mining and collecting the ore decomposition of the compounds in the ore

Question 31

three methods for reducing metal ores and extracting metals

Answer 31

heat alone (low reactive metals) heat with carbon (middle reactive metals) electrolysis (high reactive metals)

Question 32

how are mercury and silver extracted

Answer 32

thermal decomposition

Question 33

how are mercury and silver extracted

Answer 33

thermal decomposition

Question 34

which metals are extracted by heating with carbon

Answer 34

zinc iron nickel tin lead and copper

Question 35

endothermic:

Answer 35

gains heat/energy to make the reaction

Question 36

why is extraction by heating with carbon a reduction reaction

Answer 36

the metal oxide is reduced to release the metal

Question 37

electrolysis

Answer 37

splitting up the compound to extract the metal by passing electricity through a molten metal

Question 38

which metals are extracted by electrolysis

Answer 38

potassium sodium calcium magnesium and aluminum

Question 39

name 3 metals extracted by electrolysis

Answer 39

potassium sodium and magnesium