Exam tip; Make sure you can write balanced equations for the
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; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
MgCO3 (s) (in heat forms) MgO (s) + CO2 (g)
Ca (s) + 2HCl (l) (forms) CaCl2 (s) + H2 (g)
Zn (s) + H2SO4 (l) (forms) ZnSO4 (l) + H2 (g)
CaO (s) + H20 (l) (forms) Ca(OH)2 (l)
CaCO3 (s) (in heat forms) CaO (s) + CO2 (g)
Zn (s) + 2HCl (l) (forms) ZnCl2 (l) + H2 (g)
Ca (s) + H20 (l) (forms) CaO (s) + H2 (g)
2Mg (s) + O2 (g) (forms) 2MgO (s)
H2 (g) + Cl2 (g) (forms) 2HCl (l)
2Ca (s) + O2 (g) (forms) 2CaO (s)
Mg (s) + 2HCl (l) (forms) MgCl2 (l) + H2 (g)
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Key words; lime water, mortar, slaked lime
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Learning Objectives:
By the end of the lesson I can:
• Describe what slaked lime is and how it is produced.
Quicklime (calcium oxide) reacts with water to produce slaked
lime (calcium hydroxide).
•Explain the processes involved to make lime mortar.
Mortar can be made by mixing slaked lime (calcium hydroxide)
with sand and water.
• Limestone and its products have many uses, including
slaked lime, mortar, cement and glass.
• Atoms and symbols are used to represent and explain
what is happening to the substances in chemical reactions.
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
What’s wrong with this sentence?
Limestone is a metamorphic rock and is made of
the pure element, calcium carbonate.
•Limestone is a sedimentary rock
•It is mainly made up of calcium carbonate
•Calcium carbonate is a compound
•It is actually a mixture of substances
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
What is the chemical & common names for each substance?
CaCO3
Chemical: Calcium Carbonate
CaO
Chemical: Calcium Oxide
Ca(OH)2
Chemical: Calcium Hydroxide
CO2
Chemical: Carbon dioxide
Common: Limestone/Chalk/Marble
Common: Quicklime
Common: Slaked Lime (or Limewater when in solution)
Common: Carbon dioxide
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Limestone Cycle:
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Limestone Cycle:
When limestone (calcium carbonate) is
heated strongly, it decomposes to give solid
quicklime (calcium oxide) and carbon dioxide
gas. When a small amount of water is added
to quicklime it gives slaked lime (calcium
hydroxide). If a lot of water is added to the
slaked lime a solution of lime water or
calcium hydroxide is formed. If carbon
dioxide is bubbled through lime water,
limestone is formed again, along with water.
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Limestone Cycle:
Carbon
Dioxide
Lime
water
Quicklime
Water
Slaked lime
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Aim: To investigate the limestone cycle
Equipment:
The
•
Gauze, Tripod, bunsen burner & heat proof mat
Limestone
•
Tongs, glass rod, pipette, straw
Cycle
•
2xboiling tubes, test tube rack
•
Filter funnel & filter paper
•
Calcium carbonate, water
Method:
1.
Place a piece of CaCO3 on the gauze mat & strongly heat the edge until it has
been white/orange hot for a few minutes. What type of reaction have you just
completed? BE SAFE: CaO holds it heat for a long time & are basic –harmful
2.
Using tongs, transfer the CaO to a boiling tube, add afew drops of water &
observe. What happened?
3.
Fill the boiling tube till its 1/3 full and shake gently. BE SAFE: When water is
added to CaO it will spit – so be sure to be wearing goggles!
4.
Filter the mixture and keep the filtrate. What is the name of the filtrate?
5.
Submerge a straw into the filtrate & gently blow. If the solution turns cloudy
then the cycle has been completed successfully. Well Done!
Add observations, word & symbol equations to your limestone cycle diagram
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Common Name: QUICKLIME
Chemical Name: CALCIUM OXIDE
Molecular formula: CaO
Calcium carbonate
 calcium oxide (s) + carbon dioxide (g)
CaCO3(s)
 CaO (s)
+ CO2 (g)
Common Name: SLAKED LIME
Chemical Name: CALCIUM HYDROXIDE
Molecular formula: Ca(OH)2
Calcium oxide (s) + water (l)  calcium hydroxide (s)
CaO (s)
+ H2O (l)  Ca(OH)2 (s)
Common Name: LIMEWATER
Molecular formula: Ca(OH)2 (aq)
Chemical Name: CALCIUM HYDROXIDE IN SOLUTION
Calcium hydroxide (s) + water (l)  calcium hydroxide (s)
Ca(OH)2 (s)
+ H2O (l)  Ca(OH)2 (aq)
Common Name: LIMESTONE
Chemical Name: CALCIUM CARBONATE
Molecular formula: CaCO3
Calcium hydroxide (aq) + carbon dioxide (g)  calcium carbonate (s) + water (l)
Ca(OH)2 (aq)
+ CO2 (g)
 CaCO3 (s)
+ H2O (l)
GCSE Core Chemistry
Exam tip; Make sure you can write balanced equations for the
reactions of quicklime with water & slaked lime with carbon dioxide
Learning Objectives:
By the end of the lesson I can:
• Describe what slaked lime is and how it is produced.
Quicklime (calcium oxide) reacts with water to produce slaked
lime (calcium hydroxide).
•Explain the processes involved to make lime mortar.
Mortar can be made by mixing slaked lime (calcium hydroxide)
with sand and water.
• Limestone and its products have many uses, including
slaked lime, mortar, cement and glass.
• Atoms and symbols are used to represent and explain
what is happening to the substances in chemical reactions.
GCSE Core Chemistry