IGCSE CHEMISTRY 0620 Basic Questions Chapter 8 KANAYATI®

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How do you separate an excess insoluble reactant from a solution? *

1 point

Filtration

Precipitation

Evaporation

When an acid and an alkali react, a salt and water are formed. Pick the correct salt produced when ammonium hydroxide reacts with nitric acid. *

1 point

Ammonium chloride

Ammonium nitrate

Ammonium sulfate

Ammonium phosphate

When producing a soluble salt in a reaction between an acid and an alkali, how can you prepare dry solid crystals from the solution? *

1 point

Filtration

Neutralisation

Evaporation/crystallisation

When performing an acid-alkali titration, what piece of apparatus is used to place a fixed volume of the first solution into the conical flask? *

1 point

Pipette

Burette

Beaker

How do the concentrations of ions in an alkaline solution compare to pure water? *

1 point

The alkali contains more hydroxide ions (OH-)

The alkali contains more hydrogen ions (H+)

The alkali and pure water contain the same concentration of hydrogen ions (H+) and hydroxide ions (OH-)

Pick the correct equation for the reaction between hydrochloric acid and iron oxide. *

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Hydrochloric acid + solid iron (III) oxide → iron (III) chloride solution + water

Hydrochloric acid + iron (III) oxide → iron (II) chloride solution + water

Hydrochloric acid + iron (III) oxide → iron (III) chlorate solution + water

Sulfuric acid + iron (III) oxide → iron (III) chloride solution + water

Which of these substances is most likely to be insoluble? *

1 point

Sodium carbonate

Calcium nitrate

Calcium carbonate

Why do you add excess of the insoluble reactant when making a soluble salt? *

1 point

To make sure all the acid is used up

To separate the solid from the solution

To make sure a reaction occurs

Magnesium chloride solution and sodium carbonate solution are mixed together. What substance is precipitated? *

1 point

Sodium chloride

Magnesium carbonate

Chlorine carbonate

Natural rainwater has a pH of 5. The most acidic rain ever recorded in Britain was 1000 times more acidic than natural rainwater. What was its pH? - Higher *

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A substance with a pH of 6 is... *

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a weak acid

a strong acid

a weak alkali

neutral

Pick the correct combination of definitions. *

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Acid - proton acceptor - Alkali - proton donor

Acid - proton donor - Alkali - proton acceptor

Acid - proton giver - Alkali - proton donor

Acid - proton acceptor - Alkali - proton acceptor

Which two chemicals could you react to make only potassium chloride and water? *

1 point

Potassium and hydrochloric acid

Potassium hydroxide and hydrochloric acid

Potassium oxide and sulfuric acid

When a soluble salt is formed from an acid and an insoluble base, how do you know when an excess of base has been added? *

1 point

When bubbles of gas appear

When the reactant all dissolves

When some of the reactant is left unreacted/undissolved

What is the general equation for the reaction of a metal with an acid? *

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Metal + acid → salt + hydrogen

Metal + acid → salt + water

Metal + acid → salt + alkali

Salts can also be made by reacting metals with acids. What gas is given off when a metal reacts with an acid? *

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Oxygen

Carbon dioxide

Hydrogen

Nitrogen

When processing titration results, what do you do with results that are very close together?

1 point

Calculate the average value

Ignore both values

Choose the highest value

Clear selection

What is an alkali? *

1 point

A substance that will neutralise an acid

A substance that produces H+ ions when added to water

A soluble base

A chemical which changes colour when added to acids and alkalis

What products are formed when hydrochloric acid reacts with copper carbonate? *

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Copper chloride and hydrogen

Copper chloride, water and carbon dioxide

Copper chloride and water

Which salt would be formed by reacting cobalt carbonate and hydrochloric acid? *

1 point

Cobalt sulfate

Cobalt chloride

Cobalt hydroxide

Which of the following solutions could have a pH of 12? *

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Sodium chloride

Sulfuric acid

Sodium hydroxide

What is the name of the salt produced when potassium hydroxide reacts with sulfuric acid? *

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Potassium sulfide

Potassium sulfate

Potassium sulfuric

How does diluting an acid with water affect its pH? *

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The pH decreases towards 7

The pH increases towards 7

It has no effect on the pH

What happens to the pH of a solution of hydrochloric acid as calcium oxide is added? *

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It rises

It falls

It stays the same

We can react an acid and an alkali together to produce a salt. The correct name for this type of chemical reaction is... *

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combustion

oxidation

thermal decomposition

neutralisation

A strong acid... *

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turns universal indicator paper green

has a high pH number

is partially ionised in water

is 100% ionised in water

A small amount of hydrochloric acid is dissolved in a large volume of water. What is the best description of this solution? - Higher *

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A dilute solution of a weak acid

A weak solution of a strong acid

A dilute solution of a strong acid

What is an acid? *

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A substance that will neutralise an acid

A substance that produces H+ ions when added to water

A soluble base

A chemical which changes colour when added to acids and alkalis

What colour change could occur when hydrochloric acid is added to an alkaline solution containing universal indicator? *

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Red to green

Green to purple

Purple to red

Precipitation reactions occur when an insoluble salt is formed. Precipitation reactions can be used in industry to... *

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remove some substances from waste water

split large molecules into smaller ones

remove unwanted impurities from metals

remove metals from their ores

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