Building Blocks 1d Int 2

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Which elements are conductors of electricity?

Metals

and the non-metal carbon(graphite)

Which elements are non- conductors

of electricity?

Non metals except carbon(graphite)

Why are metals able to conduct electricity?

They contain free moving electrons

Which type of compounds (solid, liquid, solution) do not

conduct electricity?

Covalent compounds

(non metals atoms)

Why are covalent compounds unable to conduct electricity?

They are made up of molecules which are

uncharged.

They do not contain charged ions.

In which state will an ionic compound not conduct electricity?

solid

Why are ionic compounds able to conduct electricity when molten or in

solution?

They ions are free to move

Why do ionic compounds not conduct electricity when solid?

They ions are not free to move

A solid substance conducts electricity.

What type of substance is it?

Metal or carbon(graphite)(no compound conducts

when solid)

A substance does not conduct when solid but is able to conduct when

molten/solution. What type of substance is it?

Ionic

Metal/non-metal compound

A substance does not conduct electricity in any state.

What type of substance is it?

Covalent

A substance does not conduct electricity in any state and has a very high

melting/boiling point. What type of substance is it?

Covalent network

A substance does not conduct electricity in any state and has a low

melting/boiling point. What type of substance is it?

Covalent molecule

Are ionic compounds usually soluble or insoluble in water?

soluble

Are covalent compounds usually soluble or insoluble in water?

Insoluble

What is electrolysis?

The breaking up of an ionic compound using electricity.

What is an electric current?

A flow of electrons

A pupil passed electricity through copper chloride solution. What would be seen at

the negative electrode?

Brown solid/copper metal

- positive metal ions are attracted to the negative electrode.

Chlorine gas(bubbles of gas would be seen at the positive electrode -

chloride ions are negative.

A pupil passed electricity through copper chloride solution.

Write ion electron equations showing the formation of copper and the

formation of chlorine .?At negative electrode: Cu2+ + 2e- Cu

At positive electrode: 2Cl- Cl2 + 2e-

Why must a d.c supply be used in electrolysis?

So that the products can

be identified.

So only one product is collected/given off at an electrode.

Are electrons gained or lost at the negative electrode?

Positive metal ions

gain electrons.

Write the formula for the following-carbon monoxide, nitrogen dioxide,

sulphur trioxide, dinitrogen tetraoxide, carbon tetrachloride,

CO NO2 SO3

N2O4 CCl4

Write the formula for the followinglithium chloride, magnesium nitride, aluminium nitride, sodium sulphide

LiCl Mg3N2

AlN Na2S

Write the formula for the followingiron(II) oxide, copper(I) oxide,

Silver(I) chloride, iron(III)chloride

FeO Cu2O

AgCl FeCl3

Write the formula for the followingsodium sulphate, copper carbonate, magnesium hydroxide, ammonium

carbonate, calcium nitrateNa2SO4 CuCO3 Mg(OH)2

(NH4)2CO3 Ca(NO3)

Balance to following equationsC3H8 + O2 CO2 + H2O

Al + Cl2 AlCl3

CaCO3 + HCl CaCl2 + CO2 + H2O

C3H8 + 5 O2 3 CO2 + 4 H2O

2Al + 3Cl2 2AlCl3

CaCO3 + 2HCl CaCl2 + CO2 + H2O

Calculate the formula mass of the following

CH4 H2O Na2 SO4 Ca(NO3)2

CH4 12 + 4 =16H2O (2 x 1) + 16 = 18Na2 SO4 (2 x 23) + 32 + (4 x16) = 142 Ca(NO3)2 40 + (2 x 14) + (6 x 16) =164

Calculate one mole of the following

Cl2 CaCO3 CO2 Mg(OH)2

Cl2 2 x 35.5 = 71gCaCO3 40 + 12 + (3x16) = 100gCO2 12 + (2 x 16) = 44gMg(OH)2 24.5 + (2 x 16) + (2 x 1) = 58.5 g

Calculate the number of moles in the following88g CO2 10g CaCO3

10.1g KNO3 16g O2

1 mole CO2 = 12 + (2 x 16) = 44g 88/44 = 2 moles

1 mole CaCO3 = 40 + 12 + (3 x 16) = 100g 10/100 = 0.1 moles

1 mole KNO3 = 39 + 14 + (3 x 16) = 101g 10.1/101 = 0.1 moles

1 mole O2 = 2 x 16 = 32 g 16/32 = 0.5 moles

Calculate the mass of the following4 moles HCl 0.1 moles H2S

0.25 moles CaCO3 0.5 moles (NH4)2SO4

1mole HCl = 1 x 35.5 = 36.5g 4 moles = 4 x 36.6 = 146g

1mole of H2S = (2 x 1) + 32 = 34 g 0.1 moles = 0.1 x 34 = 3.4g

1 moles CaCO3 = 40 + 12 + (3 x 16) = 100g 0.25 moles = 0.25 x 100 = 25g

1 mole (NH4)2SO4 = (2 x 14) + (8 x 1) + 32 + (4 x 16) = 132g0.5 moles = 0.5 x 132 = 66g

Calculate the mass of carbon dioxide is produced when 4g of methane burns completely in oxygen.

CH4 + 2O2 CO2 + 2H2O

1 mole of CH4 produced 1 mole of CO2

if 16g gives 44g

then 4g gives 4/16 x 44 = 11g

( 4g is a 1/4 of 16g so a 1/4 of 44g is 11g)

Calculate the mass of water produced on burning 2.8g of ethene.

C2H4 + 3O2 2CO2 + 2H2O

1 moles of ethene C2H4 produced 2 moles water H2O

28g (1 mole) gives 36g (2 moles) 2.8g gives 2.8/28 x 36

= 3.6g

( 2.8g is a tenth of 28g so a tenth of 36g is 3.6g

Building Blocks 1d Int 2

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8 9 10 11 12 13 14

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27 28 29 30 31 32