Exam questions Flashcards by Cara Ho

Thermal decomposition define

Break down of substances chemically using heat

How well did you know this?

Not at all

Perfectly

1 advantage of recycling iron

Conserve iron ore

How well did you know this?

Not at all

Perfectly

Steel is made of…

Iron and carbo

How well did you know this?

Not at all

Perfectly

Empirical formula

Ratio

How well did you know this?

Not at all

Perfectly

Contact process conditions [3]

Temperature: 450c
Pressure: 2atm
Catalyst: Vanadium oxide

How well did you know this?

Not at all

Perfectly

carbonate formula

CO3^-2

How well did you know this?

Not at all

Perfectly

What is hydrogen oxygen fuel cell and what it does [2]

1) Hydrogen and oxygen react to form water
2) Turns chemical energy into electrical energy

How well did you know this?

Not at all

Perfectly

pro & con of hydrogen oxygen fuel cell [2]

1) Does not produce pollutants
2) Requires energy to make hydrogen which comes from fossil fuels

How well did you know this?

Not at all

Perfectly

Draw exothermic graph

Reactant higher than product
Negative enthalpy

How well did you know this?

Not at all

Perfectly

Draw endothermic graph

Reactant lower than product
Positive enthalpy

How well did you know this?

Not at all

Perfectly

Describe process of iron extraction [6]

HIGHER TIER!!

1) Hematite + coke + limestone
2) Air comes in and carbon + oxygen -> carbon dioxide (Release energy for iron oxide reduction
3) carbon dioxide + carbon -> carbon monoxide (Reducing agent)
4) Iron oxide + carbon monoxide -> Iron + carbon dioxide
5) Lime stone undergo thermal decomposition
6) Calcium oxide reacts with silicon dioxide to form slag

How well did you know this?

Not at all

Perfectly

chemical equation for carbon monoxide formed in iron extraction

CO2 + C -> 2CO

How well did you know this?

Not at all

Perfectly

chemical equation for iron displaced

Fe2O3 + 3CO → 2Fe + 3CO2

How well did you know this?

Not at all

Perfectly

Lime stone thermal decomposition chemical equation

CaCO3 → CaO + CO2

How well did you know this?

Not at all

Perfectly

Slag formation chemical equation

CaO + SiO2 → CaSiO3

How well did you know this?

Not at all

Perfectly

What is and what does a catalytic converter do? [2]

1) Used in vehicles to remove oxides of nitrogen by converting it into nitrogen
2) The oxygen in oxides of nitrogen comes from the air in the car engine

How well did you know this?

Not at all

Perfectly

Catalyst for ester

Sulfuric acid

How well did you know this?

Not at all

Perfectly

First 4 alkanes

Ethane
Methane
Propane
Butane

How well did you know this?

Not at all

Perfectly

1dm3 into cm3

1000dm3

How well did you know this?

Not at all

Perfectly

Volume (dm3) formula

Moles x 24

How well did you know this?

Not at all

Perfectly

Concentration formula

Mass/volume

How well did you know this?

Not at all

Perfectly

Which compounds both contribute to acid rain

sulphur dioxide
oxides of nitrogen

Why is cryolite used in aluminium extraction

Dissolve aluminium oxide

Indicator for water

Cobalt (II) chloride

Bromine water test

In alkane it will be decoloured

Define solute

a substance that is dissolved in a solution

Define solvent

a substance that dissolves a solute, resulting in a solution.

Describe contact process [3]

`1) Sulfur reacts with air sulfur + oxygen → sulfur dioxide 2) Catalyst is used sulfur dioxide + oxygen rightwards (equilibrium) sulfur trioxide 3) Once sulfur trioxide is formed, it undergoes more processes to produce sulfuric acid

Main impurity in iron ore

Silicon (IV) oxide

Displacement reaction

When a more reactive metal displaces another

Reactivity series

Please Stop Calling Me A Careless Zebra Instead Try Learning How Copper Saves Gold

Conditions of contact process [3]

1) 200 kPa 2) Vanadium (V) oxide 3) 450c

Describe two methods by which sulfur dioxide is obtained

M1 burning sulfur (in air) M2 Roasting sulfide ores (in air)

Define base

Proton acceptor

State the term given to a base which dissolves to form an aqueous solution

Alkali

thymolphthalein changes to what colour when it reacts with a base

Higher than pH 10 gives you blue

Convert from mol/dm3 to g/dm3

Multiply by mass number

State the term given to reactions in which one atom in an alkane is replaced by another atom

Substitution

State the term given to any reaction which requires ultraviolet light

Photochemical

Write the ionic equation for the reaction when an acid neutralises a soluble base

H+ + OH- -> H2O

Complete the symbol equation to show the dissociation of ethanoic acid. CH3COOH

CH3COOH ⇌ CH3COO– + H+

Macromolecular structure properties [2]

1) High melting and boiling point 2) Does not conduct electricity when solid or liquid (Covalent bonded)

Define electrolysis

breakdown by electricity of an ionic compound in aqueous or molten state

Give two reasons why the electrolysis is carried out on aluminium oxide dissolved in molten cryolite instead of electrolysing molten aluminium oxide only

1) Improves conductivity 2) Lower operating temperature

Sulfuric acid

H2SO4

Flame test Li+

Red

Flame test K+

Yellow

Flame test Li+

Lilac

Flame test Ca2+

Orange-red

Flame test Cu2+

Blue-green

Methyl orange indicator in acid solution

Yellow to orange

Draw the structure of the carboxylic acid containing three carbon atoms.

https://hi-static.z-dn.net/files/d4b/1174be5ed5b54b03b911fc5c060ae6ed.png

The equation for the thermal decomposition of sodium hydrogencarbonate is shown. 2NaHCO3 -> Na2CO3 + H2O + CO2 The Mr of sodium hydrogencarbonate, NaHCO3, is 84. The Mr of sodium carbonate, Na2CO3, is 106. In an experiment, 2.1 g of sodium hydrogencarbonate is heated but not all of it decomposes. All of the carbon dioxide is collected and measured at room temperature and pressure. The total volume of carbon dioxide produced is 0.21 dm3 . The volume of 1 mole of a gas at room temperature and pressure is 24 dm3 .

The mass of sodium carbonate produced is 0.93 g