12 Questions
What type of reaction is represented by the chemical equation CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat?
Combination reaction
Which product is formed when calcium hydroxide reacts with carbon dioxide according to the chemical equation Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)?
Calcium carbonate
What is the main purpose of using slaked lime (calcium hydroxide) for whitewashing walls?
To give a shiny finish to the walls
Which general type of reaction is represented by the burning of coal according to the chemical equation C(s) + O2(g) → CO2(g)?
Combination reaction
What is the purpose of balancing a chemical equation?
To ensure the number of atoms of each element remains the same before and after a chemical reaction
What does a 'skeletal chemical equation' for a reaction represent?
An unbalanced chemical equation
What is the law of conservation of mass as it applies to chemical reactions?
The total mass of elements in the products must be equal to the total mass of elements in the reactants
What does the burning of magnesium in air produce, as represented by equation (1.2)?
Magnesium oxide
What is the result when dilute hydrochloric acid is added to iron fillings?
Hydrogen gas and iron chloride are produced
What is the purpose of balancing chemical equations?
To ensure conservation of mass
What is the balanced chemical equation for the reaction: Hydrogen gas combines with nitrogen to form ammonia?
2H2 + N2 → 2NH3
What is the balanced chemical equation for the reaction: Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate?
BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
Test your understanding of balancing chemical equations by comparing the number of atoms of each element on both sides of the equation. Determine if the equation is balanced or unbalanced and identify skeletal chemical equations.
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