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Questions and Answers
What is released when silver chloride decomposes under sunlight?
What is released when silver chloride decomposes under sunlight?
Which form of energy is responsible for the decomposition of silver bromide?
Which form of energy is responsible for the decomposition of silver bromide?
What type of reaction occurs when the barium hydroxide and ammonium chloride are mixed?
What type of reaction occurs when the barium hydroxide and ammonium chloride are mixed?
Which equation represents the decomposition of silver chloride?
Which equation represents the decomposition of silver chloride?
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In black and white photography, which reaction is utilized?
In black and white photography, which reaction is utilized?
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What is the state of silver before the decomposition of silver chloride occurs?
What is the state of silver before the decomposition of silver chloride occurs?
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What is the chemical formula for the substance used in whitewashing?
What is the chemical formula for the substance used in whitewashing?
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What happens to ferrous sulphate crystals when they are heated?
What happens to ferrous sulphate crystals when they are heated?
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What is the solid product formed from the decomposition of ferrous sulphate?
What is the solid product formed from the decomposition of ferrous sulphate?
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What type of reaction occurs when ferrous sulphate decomposes upon heating?
What type of reaction occurs when ferrous sulphate decomposes upon heating?
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What characteristic odor might be detected during the heating of ferrous sulphate?
What characteristic odor might be detected during the heating of ferrous sulphate?
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What are the gaseous products formed in the decomposition of ferrous sulphate?
What are the gaseous products formed in the decomposition of ferrous sulphate?
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What is the name of the solid product formed from the thermal decomposition of calcium carbonate?
What is the name of the solid product formed from the thermal decomposition of calcium carbonate?
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What is indicated by the reaction of calcium carbonate when it breaks down upon heating?
What is indicated by the reaction of calcium carbonate when it breaks down upon heating?
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What is the chemical formula for ferric oxide produced from the decomposition of ferrous sulphate?
What is the chemical formula for ferric oxide produced from the decomposition of ferrous sulphate?
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What is the purpose of using chemical formulae in a chemical equation?
What is the purpose of using chemical formulae in a chemical equation?
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In a balanced chemical equation, what must be true about the number of atoms of each element?
In a balanced chemical equation, what must be true about the number of atoms of each element?
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Which of the following is a characteristic of a skeletal chemical equation?
Which of the following is a characteristic of a skeletal chemical equation?
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What does the arrow in a chemical equation signify?
What does the arrow in a chemical equation signify?
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What equation represents the burning of magnesium in air using its chemical formula?
What equation represents the burning of magnesium in air using its chemical formula?
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How do you identify whether a chemical equation is balanced or unbalanced?
How do you identify whether a chemical equation is balanced or unbalanced?
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What results from not balancing a skeletal chemical equation?
What results from not balancing a skeletal chemical equation?
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Which of the following represents the word-equation for a reaction involving zinc and sulfuric acid?
Which of the following represents the word-equation for a reaction involving zinc and sulfuric acid?
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What does it mean for a chemical equation to be balanced?
What does it mean for a chemical equation to be balanced?
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Which type of reaction involves two or more substances combining to form a new single substance?
Which type of reaction involves two or more substances combining to form a new single substance?
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What type of reaction occurs when a single substance decomposes to give two or more substances?
What type of reaction occurs when a single substance decomposes to give two or more substances?
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Which statement correctly defines an exothermic reaction?
Which statement correctly defines an exothermic reaction?
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In a displacement reaction, what happens?
In a displacement reaction, what happens?
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What characterizes a double displacement reaction?
What characterizes a double displacement reaction?
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What is oxidation in terms of chemical reactions?
What is oxidation in terms of chemical reactions?
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What is produced when dilute hydrochloric acid reacts with iron fillings?
What is produced when dilute hydrochloric acid reacts with iron fillings?
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What are the products of the reaction between potassium metal and water?
What are the products of the reaction between potassium metal and water?
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What is formed when barium chloride reacts with aluminium sulphate?
What is formed when barium chloride reacts with aluminium sulphate?
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What type of reaction is represented by the equation, H2 + Cl2 → 2HCl?
What type of reaction is represented by the equation, H2 + Cl2 → 2HCl?
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Which of the following correctly represents a decomposition reaction?
Which of the following correctly represents a decomposition reaction?
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What type of reaction involves the formation of a precipitate?
What type of reaction involves the formation of a precipitate?
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In which reaction does respiration occur, highlighting its exothermic nature?
In which reaction does respiration occur, highlighting its exothermic nature?
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What happens in a double displacement reaction?
What happens in a double displacement reaction?
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What is an example of an endothermic reaction?
What is an example of an endothermic reaction?
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Study Notes
Chemical Equations
- Chemical equations represent chemical reactions.
- Reactants are written on the left side with a plus sign (+) between them.
- Products are written on the right side with a plus sign (+) between them.
- The arrowhead points towards the products, showing the direction of the reaction.
- Chemical equations can be made concise and useful if we use chemical formulas instead of words.
- A skeletal chemical equation is an unbalanced equation.
- In a balanced chemical equation, the number of atoms of each element on both sides of the arrow are the same.
- When balancing a chemical equation, remember the law of conservation of mass: mass can neither be created nor destroyed in a chemical reaction.
Types Of Chemical Reactions
- Combination Reaction: Two or more substances combine to form a new single substance.
- Decomposition Reactions: A single substance decomposes to give two or more substances. They are the opposite of combination reactions.
- Displacement Reactions: An element displaces another element from its compound.
- Double Displacement Reactions: Two different atoms or groups of atoms (ions) are exchanged.
- Precipitation reactions: Reactions that produce insoluble salts.
Energy Changes In Chemical Reactions
- Exothermic reactions: Reactions in which heat is given out along with the products.
- Endothermic reactions: Reactions in which energy is absorbed.
Oxidation and Reduction
- Oxidation: The gain of oxygen or loss of hydrogen.
- Reduction: The loss of oxygen or gain of hydrogen.
Examples of Reactions
- Burning of magnesium in air: Mg + O2 → MgO
- Reaction of zinc with sulfuric acid: Zn + H2SO4 → ZnSO4 + H2
- Decomposition of ferrous sulfate (Heating changes the color of the crystals; you can smell sulfur): 2FeSO4(s) → Fe2O3(s) + SO2(g) + SO3(g)
- Decomposition of calcium carbonate: CaCO3(s) → CaO(s) + CO2(g)
- Decomposition of silver chloride in sunlight: 2AgCl(s) → 2Ag(s) + Cl2(g)
- Decomposition of silver bromide in sunlight: 2AgBr(s) → 2Ag(s) + Br2(g) (used in black and white photography)
- Reaction of barium hydroxide with ammonium chloride (feels cold, endothermic): Ba(OH)2 + 2NH4Cl → BaCl2 + 2NH3 + 2H2O
- Reaction of dilute hydrochloric acid with iron fillings: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
- Recovery of silver from silver nitrate solution by copper metal: 2AgNO3(aq) + Cu(s) → Cu(NO3)2(aq) + 2Ag(s)
- Reaction of potassium bromide with barium iodide: 2KBr(aq) + BaI2(aq) → 2KI(aq) + BaBr2(s)
- Decomposition of zinc carbonate: ZnCO3(s) → ZnO(s) + CO2(g)
- Reaction of hydrogen with chlorine: H2(g) + Cl2(g) → 2HCl(g)
- Reaction of magnesium with hydrochloric acid: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
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Description
This quiz covers the fundamentals of chemical equations, including their representation of chemical reactions, the distinction between skeletal and balanced equations, and important laws such as the conservation of mass. Additionally, various types of chemical reactions, such as combination and decomposition reactions, are explored.
