REACTIONS

Question 1

redox reaction

Answer 1

a chemical reaction where both oxidation and reduction happens at the same time

Question 2

oxidation

Answer 2

gaining of oxygen, loss of electrons

Question 3

reduction

Answer 3

loss of oxygen, gaining of electrons

Question 4

alkanes undergoes reaction with

Answer 4

Reaction with oxygen

Alkanes are generally unreactive, but burn in oxygen

Question 5

Graphite and metals are good electrical conductors because…

Answer 5

because they have delocalized electrons which allow electricity to pass through.

Question 6

alkanes

Answer 6

hydrocarbon which has only single bonds= saturated

Question 7

alkenes

Answer 7

An unsaturated compound is one with at least one double bond between two carbon atoms.

Question 8

pollutant reacts with haemoglobin.

Answer 8

carbon monoxide = CO

Question 9

amount of carbons in butane

Answer 9

4

Question 10

naming hydrocarbons in order

Answer 10

meth-
eth-
prop-
but-

Question 11

alloy

Answer 11

An alloy is a mixture of a metal with one or more other elements

Question 12

reactivity trend as you go down Group I.

Answer 12

it increases

Question 13

noble gases reactivity

Answer 13

Noble gases have full outermost shells and are therefore unreactive.

Question 14

The mass number is also…

Answer 14

nucleon, atomic number

Question 15

uses of diamond

Answer 15

very hard, cutting material in drills.

Question 16

type of ion is formed when metals react

Answer 16

positive ion(cations).

Question 17

what happens in metal to form ion

Answer 17

Metals lose electrons to form positive ions when they react.

Question 18

density change as you go down the group

Answer 18

The atoms get bigger as you go down, and elements becomes denser

Question 19

corrosion

Answer 19

the destruction of materials by chemical reactions with substances in the environment

Question 20

electrolysis

Answer 20

the splitting up of an ionic compound using electricity. (used for metals more reactive than carbon )

Question 21

galvanize

Answer 21

the process used to protect metals against corrosion by adding a protective layer of zinc

Question 22

ore

Answer 22

type of rock containing metal compounds worth extracting

Question 23

reduction with carbon

Answer 23

the process used to extract minerals from their oxide (less reactive than carbon) by heating it up with carbon. metal oxide –> metallic element

Question 24

properties of metals (5)

Answer 24

ductile, malleable, good conductors, high melting/boiling point, a giant structure

Question 25

displacement

Answer 25

when a more reactive metal displaces a less reactive metal from its compound

Question 26

structure pure metals

Answer 26

atoms tightly packed together and arranged in layers within a giant metallic structure.

Question 27

metallic bonding

Answer 27

the electrostatic attraction between positively charged metal ions and the sea of delocalised electrons

Question 28

raw material in blast furnace

Answer 28

limestone(carbon carbonate), iron ore, coke, air

Question 29

blast furnace+process

Answer 29

the reaction used to extract iron from hematite. raw materials are added, hot air enters at the bottom and goes to the top.

Question 30

metals in water

Answer 30

metal + water --> metal hydroxide+ hydrogen

Question 31

rusting meaning

Answer 31

reaction between iron(III)(steel) with water+oxygen

Question 32

rusting equation

Answer 32

iron+ oxygen--> hydrated iron(III) oxide

Question 33

Carbon monoxide formed ...

Answer 33

from the incomplete combustion of carbon-containing substances

Question 33

Carbon dioxide is released by

Answer 33

is released by the thermal decomposition of calcium carbonate.

Question 34

more reactive metals...

Answer 34

have bigger chances of forming positive ions

Question 35

how is hydrogen made ?

Answer 35

Methane is reacted with steam to make hydrogen

Question 36

what is atom charge ?

Answer 36

An atom is neutral because it has the same number of protons and electrons.

Question 37

transition metal density

Answer 37

transition metal has a higher density

Question 38

homologous series

Answer 38

a group of organic compounds with the same general formula

Question 39

alkanes general formula

Answer 39

CxH'2x+2

Question 40

alkenes general formula

Answer 40

CxH2x

Question 41

aluminium uses

Answer 41

manufacture of airplanes due to low density and strength

Question 42

transition elements properties

Answer 42

transition elements have high melting points, high densities and form colored compounds.

Question 43

Why is chlorine added to the treatment of water?

Answer 43

Chlorine is toxic to pathogens and will kill them to make drinking water safe.

Question 44

group 7 properties

Answer 44

low melting point, low density , very reactive

Question 44

group 7 properties

Answer 44

low melting point, low density , very reactive

Question 45

extraction of iron

Answer 45

Carbon monoxide reduces iron oxide to form iron metal.

Question 46

Test of metal to discover the order of reactivity

Question 47

acid rain

Answer 47

oxide of nitrogen and sulfur dioxide

Question 48

methane formed

Answer 48

decomposition vegetation, animal waste gases

Question 49

When methane burns ...

Answer 49

completely in air, carbon dioxide and water are formed.

Question 50

Melting points .... Group I.

Answer 50

Melting point decrease as you descend Group I.

Question 51

covalent bonds

Answer 51

between two non metals

Question 52

Reactivity .... group 7

Answer 52

decreases as you go down Group VII.

Question 53

biological process that releases carbon dioxide into the atmosphere.

Answer 53

respiration

Question 54

blast furnace process (5)

Answer 54

carbon reacts with oxygen and carbon dioxide to heat the furnace. CO2 reacts with carbon to produce carbon monoxide. CO reduces iron oxide to form iron and carbon dioxide. limestone is thermally decomposed to form calcium oxide and CO2 . calcium oxide reacts with silicon dioxide to form slag.

Question 55

greenhouse gas

Answer 55

carbon dioxide, methane

Question 56

cracking requires

Answer 56

high temperature, high pressure, catalysts

Question 57

fossil fuels

Answer 57

petroleum, naturtal gases, cole

Question 58

crude oil

Answer 58

mix of hydrocarbon

Question 59

metal with water reaction equation

Answer 59

metalhydroxide + hydrogen

Question 59

metal with water reaction equation

Answer 59

metalhydroxide + hydrogen