16 Questions
What is produced when dilute hydrochloric acid is added to iron fillings?
Hydrogen gas and iron chloride
What is a balanced chemical equation?
An equation where the mass and the charge balance on both sides
What type of reaction produces water and sulfur dioxide from hydrogen sulfide gas?
Combustion reaction
What is produced when barium chloride reacts with aluminum sulfate?
Barium sulfate and aluminum chloride
Which of the following is the balanced equation for the reaction of calcium hydroxide with carbon dioxide?
$Ca(OH)_2 + CO_2 \to CaCO_3 + H_2O$
Which type of reaction is identified by combining magnesium with hydrochloric acid to produce magnesium chloride and hydrogen?
Displacement reaction
Why is respiration considered an exothermic reaction?
Because it releases heat
Why are decomposition reactions called the opposite of combination reactions?
Because decomposition reactions break compounds into simpler substances while combination reactions form compounds from simpler substances
What are the products of the reaction between barium chloride and potassium sulphate?
Barium sulphate and potassium chloride
Which type of reaction occurs when hydrogen gas burns in air?
Combination
Which of the following signifies an exothermic reaction?
Burning of natural gas
What gas is produced when zinc reacts with hydrochloric acid?
Hydrogen
Which of the following reactions is a decomposition reaction?
Zinc carbonate → Zinc oxide + Carbon dioxide
Which outcome is expected when calcium hydroxide reacts with carbon dioxide?
Calcium carbonate and water
Which of the following correctly identifies the products of the reaction between hydrogen and chlorine?
Hydrogen chloride
What is the product when potassium reacts with water?
Potassium hydroxide and hydrogen
Study Notes
Chemical Reactions and Equations
- When dilute hydrochloric acid is added to iron fillings, hydrogen gas and iron chloride are produced.
Balanced Chemical Equations
- A balanced chemical equation is an equation that has the same number of atoms of each element on both the reactant and product sides.
- Chemical equations should be balanced to ensure that the law of conservation of mass is upheld.
Chemical Equations and Reactions
- Hydrogen gas combines with nitrogen to form ammonia: N2 + 3H2 → 2NH3
- Hydrogen sulphide gas burns in air to give water and sulfur dioxide: 2H2S + 3O2 → 2H2O + 2SO2
- Barium chloride reacts with aluminum sulfate to give aluminum chloride and a precipitate of barium sulfate: 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
- Potassium metal reacts with water to give potassium hydroxide and hydrogen gas: 2K + 2H2O → 2KOH + H2
Balancing Chemical Equations
- HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O
- 2NaOH + H2SO4 → Na2SO4 + 2H2O
- NaCl + AgNO3 → AgCl + NaNO3
- BaCl2 + H2SO4 → BaSO4 + 2HCl
Chemical Reactions and Equations
- Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water: Ca(OH)2 + CO2 → CaCO3 + H2O
- Zinc + Silver nitrate → Zinc nitrate + Silver: Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
- Aluminium + Copper chloride → Aluminium chloride + Copper: 2Al + 3CuCl2 → 2AlCl3 + 3Cu
- Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride: BaCl2 + K2SO4 → BaSO4 + 2KCl
Reaction Types
- Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s) (Precipitation reaction)
- Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g) (Decomposition reaction)
- Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g) (Combination reaction)
- Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g) (Single displacement reaction)
Exothermic and Endothermic Reactions
- Exothermic reaction: A reaction that releases heat energy, e.g., combustion reactions.
- Endothermic reaction: A reaction that absorbs heat energy, e.g., decomposition reactions.
- Respiration is considered an exothermic reaction because it releases heat energy.
Combination and Decomposition Reactions
- Combination reaction: A reaction in which two or more substances combine to form a single product, e.g., 2H2 + O2 → 2H2O.
- Decomposition reaction: A reaction in which a single substance breaks down into two or more products, e.g., 2H2O → 2H2 + O2.
Chemical Reactions and Equations
- When dilute hydrochloric acid is added to iron fillings, hydrogen gas and iron chloride are produced.
Balanced Chemical Equations
- A balanced chemical equation is an equation that has the same number of atoms of each element on both the reactant and product sides.
- Chemical equations should be balanced to ensure that the law of conservation of mass is upheld.
Chemical Equations and Reactions
- Hydrogen gas combines with nitrogen to form ammonia: N2 + 3H2 → 2NH3
- Hydrogen sulphide gas burns in air to give water and sulfur dioxide: 2H2S + 3O2 → 2H2O + 2SO2
- Barium chloride reacts with aluminum sulfate to give aluminum chloride and a precipitate of barium sulfate: 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
- Potassium metal reacts with water to give potassium hydroxide and hydrogen gas: 2K + 2H2O → 2KOH + H2
Balancing Chemical Equations
- HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O
- 2NaOH + H2SO4 → Na2SO4 + 2H2O
- NaCl + AgNO3 → AgCl + NaNO3
- BaCl2 + H2SO4 → BaSO4 + 2HCl
Chemical Reactions and Equations
- Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water: Ca(OH)2 + CO2 → CaCO3 + H2O
- Zinc + Silver nitrate → Zinc nitrate + Silver: Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
- Aluminium + Copper chloride → Aluminium chloride + Copper: 2Al + 3CuCl2 → 2AlCl3 + 3Cu
- Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride: BaCl2 + K2SO4 → BaSO4 + 2KCl
Reaction Types
- Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s) (Precipitation reaction)
- Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g) (Decomposition reaction)
- Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g) (Combination reaction)
- Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g) (Single displacement reaction)
Exothermic and Endothermic Reactions
- Exothermic reaction: A reaction that releases heat energy, e.g., combustion reactions.
- Endothermic reaction: A reaction that absorbs heat energy, e.g., decomposition reactions.
- Respiration is considered an exothermic reaction because it releases heat energy.
Combination and Decomposition Reactions
- Combination reaction: A reaction in which two or more substances combine to form a single product, e.g., 2H2 + O2 → 2H2O.
- Decomposition reaction: A reaction in which a single substance breaks down into two or more products, e.g., 2H2O → 2H2 + O2.
Test your understanding of chemical reactions and equations with these multiple-choice questions. Learn how to balance chemical equations and why it's important.
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