Yr8 reactivity revision

yr8 reactivity revision

Open Ended

How do we know that a chemical reaction has taken place? (write down as many things you can think of)

Multiple Choice

If something is not a chemical change, what might it be?

• A particle change

• A physical change

• A reactive change

• A partial change

Multiple Choice

Which of the following is NOT evidence of a chemical change?

• Colour change

• Precipitate formed

• Melting

• Temperature change

Multiple Choice

What happens in a chemical reaction?

• New particle form

• Particles change size

• Particles move faster

• New products form

Multiple Choice

What is meant by 'conservation of mass' in a reaction?

• the mass of the reactants is equal to the mass of the products

• The mass of the reactants is less than the mass of the products

• The mass of the reactants is more than the mass of the products

• The mass of the reactants is double the mass of the products

Everyday acids

Acids are not always strange and unusual chemicals. They can be found in the most common of objects.

They all have asour taste, such as lemon or vinegar

Everyday Alkalis

The same goes for Alkalis, they are much more common than you might imagine

They also feel soapy if you rub them between your fingers, like toothpaste or soap.

However, both Acids and Alkalis are corrosive and will eat into materials

Multiple Choice

What is the name of the scale we measure acids an alkalis on?

• Strength scale

• Damage scale

• pH scale

• Richter scale

Multiple Choice

What do we use to determine the pH of a substance?

• an indicator

• A pointer

• read the label

• taste it and see

Multiple Choice

Water has a pH of 7, is it

• acid

• alkaline

• neutral

Neutralisation

Acids can be neutralised by adding an alkali to them​

​

Neutralisation gives a solution a pH of 7 – so it is no longer acidic or alkaline.​

​

To neutralise a strong acid, you would need to add a strong alkali.​

Salts

A salt can be made by mixing together an acid and a base​

​

we can write an equation for this:

Acid + Base ----> Salt + Water

Open Ended

In a chemical equation, the chemicals on the left hand side are the_____? The right hand side are the ______?

Acid + Base ------> Salt + Water

Open Ended

We can predict the salt that would be made using the equation

Salt names are in two parts:

First part of the name of the metal used

Second part of the name is taken from the acid

e.g.

Magnesium oxide + Hydrocholric acid ----->Magnesium Chloride + water

Using this, work out he salt formed from the following acids:

Hydrochloric acid

Sulphuric acid

Nitric acid

Multiple Select

When a metal and an acid react, what is produced? (more than one answer)

• salt

• oxygen

• hydrogen

• water

Key definitions - in your books, come up with definitions for the following keywords

• Reactivity series

• Vigorous reaction

• Ore

• Displacement

Key definitions - in your books, come up with definitions for the following keywords

• Reactivity series - a list of metals ranked form most to least reactive.

• Vigorous reaction - one that is carried out forcefully, energetically and quickly

• Ore - a naturally occurring rock containing enough metal to make it worthwhile to extract it

• Displacement - a reaction in which a more reactive metal takes the place of a less reactive metal in its compound

Reactivity series

A list of metals, ranging from the most to least reactive.

*we include Carbon and Hydrogen even though they are not metals, as a comparison as they are reactive.

Multiple Choice

When we react metals with water, what is produced?

• Metal hydroxides and Hydrogen gas

• Metal hydroxides and water

• Metal hydroxides and oxygen

• Metal oxides and water

Multiple Choice

What is the name of the reaction for reacting metals and water?

• chemical reaction

• displacement reaction

• overdramatic reaction

• addition reaction

Displacement Reactions

This is where a more reactive metal can displace a less reactive metal

Luke is stronger than Han, so displaces him out of the couple with Leia

or

Metal1 is stronger than metal2 in the metal oxide and so replaces it.

Displacement reactions

Here, Magnesium is the strongest metal so will displace any of the other metals in this list.

But if we were to introduce another metal e.g. Tin (Sn), this would change the order of reactivity.

Multiple Choice

Which is the most reactive metal out of this list?

• Potassium

• Lithium

• Iron

• Copper

Multiple Choice

Which is the most reactive metal in this list?

• Calcium

• Magnesium

• Tin

• Copper

Multiple Choice

Gold and silver are very unreactive. What is another word for this?

• Relaxed

• Indifferent

• Inert

• Unbothered

Multiple Select

What are the product for the following reaction? (more than one)

• Magnesium Sulphate

• Iron

• Iron Magnesium

• Sulphur

Multiple Choice

Will a displacement reaction occur between Zinc Sulphate and Copper?

What is the correct word equation for this reaction?

• Zinc Sulphate + Copper ---> Zinc + Copper Sulphate

• Zinc Sulphate + Copper ----> Zinc Sulphate + Copper

Open Ended

We can use carbon to extract Zinc from its oxide by displacing it, explain why we cannot use this method for Magnesium.

In your books - link the correct reaction to the correct products

Copy and complete (in your books)

Metals that are unreactive are found in the earth as ________.

Metals that are reactive are found in the earth as ________.

If a metal is _____ reactive than carbon, then it CAN be extracted from its ore by _______ it with carbon.

If a metal is _______ reactive than carbon then it CANNOT be extracted from its ore using carbon.

Metal oxide + _______ ----> ________ + carbon dioxide

The metal oxide has been________.

Heating metal ores Carbon Less Metal Reduced Pure metals More

Copy and complete (in your books)

Metals that are unreactive are found in the earth as pure metals.

Metals that are reactive are found in the earth as metal ores.

If a metal is less reactive than carbon, then it CAN be extracted from its ore by heating it with carbon.

If a metal is more reactive than carbon then it CANNOT be extracted from its ore using carbon.

Metal oxide + carbon ----> metal + carbon dioxide

The metal oxide has been reduced.

Multiple Choice

sodium is more reactive than copper?

• True

• False

Multiple Choice

Adding carbon into an alloy can add strength

• True

• False

Multiple Choice

A less reactive metal can displace a more reactive metal

• True

• False

Multiple Choice

Ores usually contain metal carbonates

• True

• False

Multiple Choice

Vigorous reaction will often produce lots of bubbles

• true

• false

Multiple Choice

reactive metals are usually found in the Earth as pure metals

• True

• False