GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Key words; balanced chemical equation

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideLearning Objectives:

By the end of the lesson I can: • Most metal carbonates will undergo thermal Most metal carbonates will undergo thermal decomposition.decomposition.Metal carbonates all decompose on heating in a Metal carbonates all decompose on heating in a similarly.similarly.• • Atoms are rearranged in a chemical reaction.Atoms are rearranged in a chemical reaction.Atoms and symbols are used to represent and Atoms and symbols are used to represent and explain what is happening to the substances in explain what is happening to the substances in chemical reactions.chemical reactions.• • Conservation of mass occurs in a chemical Conservation of mass occurs in a chemical reaction.reaction. No atoms are lost or made during a chemical No atoms are lost or made during a chemical reaction so the mass of the products equals the reaction so the mass of the products equals the mass of the reactants and we can write balanced mass of the reactants and we can write balanced equations showing the atoms involved.equations showing the atoms involved.

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideWhat are we learning about today?What are we learning about today?

HINT:HINT:acdeehiimmnotolportsacdeehiimmnotolports

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideRecapRecap

THERMAL DECOMPOSITIONTHERMAL DECOMPOSITION occurs when heat is used to breakdown substances.

When LIMESTONELIMESTONE decomposes then CARBON DIOXIDE CARBON DIOXIDE and CALCIUM OXIDE CALCIUM OXIDE is produced.

LIMEWATER TURNS MILKYLIMEWATER TURNS MILKY when a person blows through a straw into the solution. This is the lab test for CARBON DIOXIDECARBON DIOXIDE.

Interpersonal: THINKTHINK FOR 30SECS

What do you expect to beWhat do you expect to beproduced when potassium carbonateproduced when potassium carbonate

is decomposed?is decomposed?

Intrapersonal: CHATCHAT with your partner

Write a GENERALWrite a GENERALequation for the equation for the

thermal decompositionthermal decompositionof of

metal oxidesmetal oxides

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideTask: Use your knowledgeTask: Use your knowledge

OVERVIEW:

You and your partner will study a metal carbonate by

• Describing its appearance

• Plan the thermal decomposition investigation

• Complete the thermal decomposition investigation

• Explain your findings to another table group (red-yellow, green-blue)

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideThe decomposition of metal carbonatesAimTo plan an experiment to compare how different metal carbonates decompose

when heated.Equipment • 2 x Test tubes and Delivery tubing• Retort stand and clamp• Bunsen burner and heat proof mat• Spatula, Metal carbonate and LimewaterMethod (Your plan should include the following:• A diagram of the apparatus.• A step-by-step account of how you would do the experiment.• A description of the following:

– How you are going to tell when the carbonates have decomposed.? - How you will compare how quickly they decompose? - How can you time exactly when the limewater goes milky? - Is it possible to make this consistent? – controlling variables - How can you make this experiment safe?)

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideThe decomposition of metal carbonates

ResultsDraw out a table using the headings below and write

down the observations for each metal carbonate• Name of carbonate• ObservationsConclusions• What patterns can you detect from your results?• Was your test fair? • Were your results accurate? Reliable?

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxidePeer Learning

Join another pair from another table and spend 10 mins each to teach what has happened in the experiment you have just completed.

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideLearning Objectives:

By the end of the lesson I can: • Most metal carbonates will undergo thermal Most metal carbonates will undergo thermal decomposition.decomposition.Metal carbonates all decompose on heating in a Metal carbonates all decompose on heating in a similarly.similarly.• • Atoms are rearranged in a chemical reaction.Atoms are rearranged in a chemical reaction.Atoms and symbols are used to represent and Atoms and symbols are used to represent and explain what is happening to the substances in explain what is happening to the substances in chemical reactions.chemical reactions.• • Conservation of mass occurs in a chemical Conservation of mass occurs in a chemical reaction.reaction. No atoms are lost or made during a chemical No atoms are lost or made during a chemical reaction so the mass of the products equals the reaction so the mass of the products equals the mass of the reactants and we can write balanced mass of the reactants and we can write balanced equations showing the atoms involved.equations showing the atoms involved.

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideChemical Reactions

Complete the following equations;Complete the following equations;

Calcium Carbonate

magnesium oxide + carbon dioxide

CuO + CO2

ZnCO3

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideFor each of the chemical reactions above;

Use the MASS NUMBERMASS NUMBER of each element to write balanced chemical equations

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxidePractice these equations in FULL – you choose the level of difficulty;Practice these equations in FULL – you choose the level of difficulty;

1.1. Thermal decomposition of magnesium carbonateThermal decomposition of magnesium carbonate2.2. Calcium added to hydrochloric acidCalcium added to hydrochloric acid3.3. Zinc metal added to sulphuric acidZinc metal added to sulphuric acid4.4. Calcium oxide is added to water to form a single compoundCalcium oxide is added to water to form a single compound5.5. Thermal decomposition of calcium carbonateThermal decomposition of calcium carbonate6.6. Zinc metal added to hydrochloric acidZinc metal added to hydrochloric acid7.7. Calcium is added to waterCalcium is added to water8.8. Magnesium metal is burnt Magnesium metal is burnt 9.9. Hydrogen gas is added to chlorine gasHydrogen gas is added to chlorine gas10.10. Calcium is added to oxygen gasCalcium is added to oxygen gas11.11. Magnesium metal is added to hydrochloric acidMagnesium metal is added to hydrochloric acid

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Key words; ionic, covalent, bonding

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideLearning Objectives:

By the end of the lesson I can:

•Compounds can be formed by ionic and covalent Compounds can be formed by ionic and covalent bonding.bonding.

••Ionic bonding involves the giving or taking of Ionic bonding involves the giving or taking of electrons.electrons.

••Covalent bonding involves the sharing of Covalent bonding involves the sharing of electrons.electrons.

•All bonding takes place to stabilise elements.All bonding takes place to stabilise elements.

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

•The mass number is the total number of protons and neutrons in the nucleus

•The proton (atomic) number is the number of protons in the nucleus.

MASS NUMBER

PROTON NUMBER

(ATOMIC) How many neutrons

are there?

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

What about electrons?

•The mass number is the total number of protons and neutrons in the nucleus

•The proton (atomic) number is the number of protons in the nucleus.

The number of electrons equals the number of protons

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Electron Configuration tells us how the electrons are arranged around the nucleus in energy levels (shells).

•The first energy level (shell) can contain a maximum of 2 electrons

•The next energy levels (shell) can contain a maximum of 8 electrons

•2,8,8,8 etc…

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

•Have a go at drawing out carbon in a dot and cross diagram…

Mass number >

Proton number >

What is the electron

configuration?

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideRULES

Proton number = Protons in the nucleus

Mass number = Protons + Neutrons in the nucleus

Number of Protons = Number of Electrons

Electron configuration = 2,8,8,8

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Draw dot and cross diagrams for:

•Sodium

•Potassium

•Fluorine

•Chlorine

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

How many protons and neutrons in the

nucleus?

How many electrons?

What is the electron

configuration?

How many electrons in the

outer shell?

Plenary

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

•Ionic bonding occurs between metal elements and non-metal elements

•The outer electrons are not shared but they are donated or gained. (Given away or received)

Why do elements want to share, donate or

gain electrons?

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Na Cl

Would it be easier to lose 1 or gain 7

electrons to have a full outer shell?

Task Two

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Na

+

Cl

-

What compound is formed?

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Mg S

What do you think will happen here?

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

SMg

2+ 2-

What is the name of this compound?

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Draw out the following simple Ionic compounds:

a) Potassium chloride – KCl

b) Lithium fluoride -LiF

c) Sodium iodide – NaI

Have a go!!!!

Start by drawing a dot

and cross diagram.

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

1. MgO

2. NaCl

3. CO

4. FeS

5. FeSO4

6. LiOH

Which are ionic compounds?

Can you name the compounds?

Magnesium Oxide

Sodium Chloride

Carbon Monoxide

Iron (II) Sulphide

Iron (II) Sulphate

Lithium Hydroxide

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide The covalent bond

When non-metal atoms react together, they need to gain electrons to fill their outer shell and become stable.

They can only do this if they share electrons with each other.

The atoms share electrons so there is a strong force that joins the atoms together.

HHincomplete outer shells

HHboth atoms have a

full outer shell

This is called a covalent bond.

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

Task Two

1) Draw dot and cross diagrams for the following simple covalent compounds

a) Chlorine gas (Cl2)

b) Methane (CH4)

c) Ammonia (NH3)

HH

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxide

ClClCl

O

H H

C

H

HH

H

GCSE Core Chemistry

Exam tip; Be able to write balanced equations for reactions of quicklime with water & slaked lime with

carbon dioxideLearning Objectives:

By the end of the lesson I can:

•Compounds can be formed by ionic and covalent Compounds can be formed by ionic and covalent bonding.bonding.

••Ionic bonding involves the giving or taking of Ionic bonding involves the giving or taking of electrons.electrons.

••Covalent bonding involves the sharing of Covalent bonding involves the sharing of electrons.electrons.

•All bonding takes place to stabilise elements.All bonding takes place to stabilise elements.