40 Questions
What is the general name of the reaction where two or more substances combine to form a single product?
Combination reaction
What is the characteristic of an exothermic reaction?
Heat is released
What is the reaction in which glucose combines with oxygen to produce energy?
Respiration
What is the type of reaction that occurs when vegetable matter decomposes into compost?
Exothermic reaction
What is the product of the reaction between hydrogen gas and oxygen gas?
Water liquid
What type of reaction involves the breakdown of a single substance into two or more products?
Decomposition reaction
What is the byproduct of the reaction between glucose and oxygen in the human body?
All of the above
What is the type of reaction that occurs when coal is burned?
Exothermic reaction
What is the colour of the iron nail before it reacts with copper sulphate solution?
No colour
What is the type of reaction that occurs between iron and copper sulphate solution?
Displacement reaction
Why do zinc and lead displace copper from its compounds?
Because they are more reactive
What is the product formed when sodium sulphate solution reacts with barium chloride solution?
Barium sulphate
What is the name of the reaction that produces a precipitate?
Precipitation reaction
What happens to the blue colour of copper sulphate solution when it reacts with iron?
It fades
What is the formula for iron sulphate?
FeSO4
What is the reactant in the reaction between iron and copper sulphate solution?
Iron
What is the product formed when calcium oxide reacts with water?
Calcium hydroxide
What type of reaction is the reaction between calcium oxide and water?
Combination reaction
What is the purpose of using a solution of slaked lime for whitewashing walls?
To create a thin layer of calcium carbonate on the walls
What is the chemical formula for marble?
CaCO3
What is the reactant that reacts slowly with carbon dioxide in air to form calcium carbonate?
Calcium hydroxide
What is the byproduct of the reaction between calcium hydroxide and carbon dioxide?
Water
What is the time period required for calcium carbonate to form on the walls after whitewashing?
Two to three days
What is the term for the reaction in which a single product is formed from two or more reactants?
Combination reaction
What is the correct statement about the reaction 2PbO(s) + C(s) → 2Pb(s) + CO2(g)?
Carbon is getting oxidised.
What type of reaction is the equation 2Fe2O3 + 2Al → Al2O3 + 2Fe?
Combustion reaction
What is produced when dilute hydrochloric acid is added to iron fillings?
Hydrogen gas and iron chloride
Why should chemical equations be balanced?
To conserve mass
What is the product of the reaction between hydrogen sulphide gas and oxygen?
Water and sulphur dioxide
What is the correct balanced equation for the reaction between barium chloride and aluminium sulphate?
BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
What is the product of the reaction between potassium metal and water?
Potassium hydroxide and hydrogen gas
What type of reaction is the equation HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O?
Neutralization reaction
What happens to magnesium when it burns in air?
It is oxidised
What is the process called when a metal is attacked by substances around it?
Corrosion
What is the term for the process by which iron gets coated with a reddish brown powder?
Rusting
What is the purpose of adding antioxidants to food?
To prevent oxidation
What is the result of fats and oils being oxidised?
They become rancid
Why do chips manufacturers flush bags of chips with gas?
To prevent oxidation
What is the common problem associated with iron?
Corrosion
What is the colour of the coating formed on copper when it corrodes?
Green
Study Notes
Chemical Reactions
- Calcium oxide (quick lime) reacts with water to form calcium hydroxide (slaked lime) releasing heat, which is a combination reaction: CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat
- A solution of slaked lime is used for whitewashing walls, and it reacts with carbon dioxide in the air to form a thin layer of calcium carbonate, giving a shiny finish to the walls: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
Combination Reactions
- Combination reactions involve two or more substances combining to form a single product.
- Examples of combination reactions include:
- Burning of coal: C(s) + O2(g) → CO2(g)
- Formation of water from hydrogen and oxygen: 2H2(g) + O2(g) → 2H2O(l)
- Burning of natural gas: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
Exothermic Reactions
- Exothermic reactions release heat along with the formation of products.
- Examples of exothermic reactions include:
- Burning of coal: C(s) + O2(g) → CO2(g)
- Burning of natural gas: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
- Respiration: C6H12O6(aq) + 6O2(aq) → 6CO2(aq) + 6H2O(l) + energy
Displacement Reactions
- Displacement reactions involve one element displacing another element from a compound.
- Examples of displacement reactions include:
- Iron displacing copper from copper sulphate solution: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
- Zinc displacing copper from copper sulphate solution: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
- Lead displacing copper from copper chloride solution: Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s)
Double Displacement Reactions
- Double displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.
- Example: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + NaCl(aq)
Corrosion and Rancidity
- Corrosion is the process of a metal being attacked by substances around it, such as moisture and acids, resulting in damage.
- Examples of corrosion include rusting of iron, tarnishing of copper and silver, and damage to car bodies and bridges.
- Rancidity is the process of oxidation of fats and oils, resulting in a change in their smell and taste.
- Antioxidants are added to foods containing fats and oils to prevent oxidation.
- Keeping food in air-tight containers helps to slow down oxidation.
This quiz is about the reaction of calcium oxide with water to form slaked lime, releasing heat. It involves the chemical equation CaO + H2O → Ca(OH)2 + Heat.
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