Chemistry - Chapter 1: Chemical Reactions and Equations

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31 Terms

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Displacement Reaction

A reaction in which the more reactive metal displaces the less reactive metal from its compound in solution or in molten forn

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Iron and Copper Sulphate Reaction

Fe + CuSO4 —— FeSO4 + Cu

CuSO4 - blue

FeSO4 - green

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Zinc and Copper Sulphate Reaction

Zn + CuSO4 —— ZnSO4 + Cu

ZnSO4 - colourless

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Lead and Copper Chloride Reaction

Pb + CuCl2 —— PbCl2 + Cu

PbCl2 - colourless

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Double Displacement Reaction

Reactions in which there is an exchange of ions between the reactants are called double displacement reaction.

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Precipitation Reaction

Any reaction that produces a precipitate

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Sodium Sulphate and Barium Chloride Reaction

Na2SO4 + BaCl2 —— BaSO4 + 2NaCl

All colourless except BaSO4 (white precipitate)

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Lead Nitrate and Potassium Iodide Reaction

Pb(NO3)2 + 2KI —— 2KNO3 + PBI2

Pb(NO3)2, KI - white

KNO3 - white/grey

PbI2 - yellow precipitate

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Oxidation

If a substance gains oxygen or loses hydrogen during a reaction, it is said to be oxidised

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Reduction

If a substance loses oxygen or gains hydrogen during a reaction, it is said to be reduced.

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Redox Reaction

During a reaction, if one reactant gets oxidised while the other gets reduced it is called a redox reaction.

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Oxidisation of Copper to Copper Oxide

2Cu + O2 —— 2CuO

Cu - brown

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Copper Oxide and Hydrogen Reaction (Redox Reaction)

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Zinc Oxide and Carbon Reaction

ZnO + C —— Zn + CO

Oxidising agent - ZnO

Reducing agent - C

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Manganese Oxide and Hydrochloric Acid Reaction

MnO2 + 4HCl —— MnCl2 + 2H2O + Cl2

Oxidising agent - MnO2

Reducing agent - HCl

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Corrosion

When a metal is attacked by substances around it such as moisture, acid, etc. it is said to corrode and this process is known as corrosion.

Eg - black coating on silver
- green coating on copper
- brown coating on iron

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Rancidity

Oxidation of fats and oil in food materials resulting in a bad smell or taste

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Rusting of Iron

Iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide (brown coating). This is known as the rusting of iron.

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Preventing Rancidity

  • Keep food in air-tight containers

  • Refrigeration

  • Add antioxidants to foods containing fats and oil

  • Oil and fat containing food items are flushed with nitrogen

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Antioxidant

Substance that prevents oxidisation

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Chemical Reaction

Whenever a chemical change occurs, we can say that a chemical change occurs

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Magnesium and Oxygen Reaction

2Mg + O2 —— 2MgO

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Observations in a Chemical Reaction

  • Change in state

  • Change in colour

  • Evolution of gas

  • Change in temperature

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Reactants and Products

The substances that undergo chemical change in a reaction are the reactants.

The new substance formed during the reaction is the product.

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Unbalanced Equation

The equation is unbalanced when the mass is not the same on both sides of the equation. It is also known as a skeletal chemical equation.

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Law of Conservation of Mass

The total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the elements present in the reactants.

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Zinc and Sulphuric Acid Reaction

Zn + H2SO4 —— ZnSO4 + H2

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Balanced Chemical Equation

If the number of atoms is the same on both sides of the arrow, it is a balanced chemical equation.

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Iron and Water Vapour Reaction

3Fe + 4H2O(g) —— Fe3O4 + 4H2(g)

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Carbon Monoxide and Hydrogen Reaction

CO + 2H2 —— CH3OH

CH3OH - Methanol

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Photosynthesis

6CO2 + 12H2O —— C6H12O6 + 6O2 + 6H2O