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 dioxide
Learning Objectives:
By the end of the lesson I can:
• Most metal carbonates will undergo thermal
decomposition.
Metal carbonates all decompose on heating in a similarly.
• Atoms are rearranged in a chemical reaction.
Atoms and symbols are used to represent and explain what
is happening to the substances in chemical reactions.
• Conservation of mass occurs in a chemical reaction.
No atoms are lost or made during a chemical reaction so
the mass of the products equals the mass of the reactants
and we can write balanced 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 dioxide
What are we learning about today?
HINT:
acdeehiimmnotolports
GCSE Core Chemistry
Exam tip; Be able to write balanced equations for reactions of
quicklime with water & slaked lime with carbon dioxide
Recap
THERMAL DECOMPOSITION occurs when heat
is used to breakdown substances.
Interpersonal: THINK FOR 30SECS
Write a GENERAL
equation for the
What do you expect to be
thermal
decomposition
When LIMESTONE
decomposes
CARBON
produced when potassiumthen
carbonate
of OXIDE is produced.
DIOXIDE and CALCIUM
is decomposed?
metal oxides
Intrapersonal: CHAT with your partner
LIMEWATER TURNS MILKY when a person
blows through a straw into the solution. This is the lab
test for CARBON DIOXIDE.
GCSE Core Chemistry
Exam tip; Be able to write balanced equations for reactions of
quicklime with water & slaked lime with carbon dioxide
Task: 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 dioxide
The decomposition of metal carbonates
Aim
To 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 Limewater
Method (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 dioxide
The decomposition of metal carbonates
Results
Draw out a table using the headings below and write
down the observations for each metal carbonate
• Name of carbonate
• Observations
Conclusions
• 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 dioxide
Peer 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 dioxide
Learning Objectives:
By the end of the lesson I can:
• Most metal carbonates will undergo thermal
decomposition.
Metal carbonates all decompose on heating in a similarly.
• Atoms are rearranged in a chemical reaction.
Atoms and symbols are used to represent and explain what
is happening to the substances in chemical reactions.
• Conservation of mass occurs in a chemical reaction.
No atoms are lost or made during a chemical reaction so
the mass of the products equals the mass of the reactants
and we can write balanced 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 dioxide
Chemical Reactions
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 dioxide
For each of the chemical reactions above;
Use the MASS 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 dioxide
Practice these equations in FULL – you choose the level of difficulty;
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Thermal decomposition of magnesium carbonate
Calcium added to hydrochloric acid
Zinc metal added to sulphuric acid
Calcium oxide is added to water to form a single compound
Thermal decomposition of calcium carbonate
Zinc metal added to hydrochloric acid
Calcium is added to water
Magnesium metal is burnt
Hydrogen gas is added to chlorine gas
Calcium is added to oxygen gas
Magnesium 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 dioxide
Learning Objectives:
By the end of the lesson I can:
•Compounds can be formed by ionic and covalent bonding.
•Ionic bonding involves the giving or taking of electrons.
•Covalent bonding involves the sharing of electrons.
•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
MASS NUMBER
PROTON NUMBER
(ATOMIC)
How many
neutrons
are there?
•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.
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 dioxide
RULES
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
Plenary
How many protons and
neutrons in the
nucleus?
How many electrons?
What is the electron
configuration?
How many electrons in
the outer shell?
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 nonmetal 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
Task Two
Na
Would it be easier to
lose 1 or gain 7
electrons to have a full
outer shell?
Cl
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
What do you think will
happen here?
Mg
S
GCSE Core Chemistry
Exam tip; Be able to write balanced equations for reactions of
quicklime with water & slaked lime with carbon dioxide
What is the name of this
compound?
2-
2+
Mg
S
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!!!!
Draw out the following simple Ionic
compounds:
a) Potassium chloride – KCl
b) Lithium fluoride -LiF
c) Sodium iodide – NaI
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
Can you name the compounds?
Which are ionic compounds?
1. MgO
Magnesium Oxide
2. NaCl
Sodium Chloride
3. CO
Carbon Monoxide
4. FeS
Iron (II) Sulphide
5. FeSO4
Iron (II) Sulphate
6. LiOH
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.
H
incomplete
outer shells
H
They can only do this if they share electrons with each other.
The atoms share
electrons so there
H
H
is a strong force
that joins the atoms
together. This is called a covalent bond.
both atoms have a
full outer shell
GCSE Core Chemistry
Exam tip; Be able to write balanced equations for reactions of
quicklime with water & slaked lime with carbon dioxide
Task Two
H
H
1) Draw dot and cross diagrams for the following
simple covalent compounds
a) Chlorine gas (Cl2)
b) Methane (CH4)
c) Ammonia (NH3)
GCSE Core Chemistry
Exam tip; Be able to write balanced equations for reactions of
quicklime with water & slaked lime with carbon dioxide
Cl
C
H
O
H
H
H
H
Cl
Cl
GCSE Core Chemistry
Exam tip; Be able to write balanced equations for reactions of
quicklime with water & slaked lime with carbon dioxide
Learning Objectives:
By the end of the lesson I can:
•Compounds can be formed by ionic and covalent bonding.
•Ionic bonding involves the giving or taking of electrons.
•Covalent bonding involves the sharing of electrons.
•All bonding takes place to stabilise elements.
GCSE Core Chemistry