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6 - Chemical Equations and Reactions

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✅EvaluateQuestion 1 of 22

Which of the following correctly represents the Law of Conservation of Mass?

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✅EvaluateQuestion 2 of 22

What does the symbol (aq) in a chemical equation indicate?

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✅EvaluateQuestion 3 of 22

What is the correct balanced equation for hydrogen reacting with oxygen to form water?

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✅EvaluateQuestion 4 of 22

Which observation best shows that a chemical reaction has occurred?

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✅EvaluateQuestion 5 of 22

What type of reaction is represented by NaOH + HCl → NaCl + H₂O?

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✅EvaluateQuestion 6 of 22

What is the reactant in the combustion of propane?

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✅EvaluateQuestion 7 of 22

Which of the following is an example of a combination reaction?

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✅EvaluateQuestion 8 of 22

What would you observe when barium chloride solution is mixed with sodium sulfate solution?

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✅EvaluateQuestion 9 of 22

Which of the following is a redox reaction?

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✅EvaluateQuestion 10 of 22

Which type of chemical reaction occurs when limestone is heated to form quicklime and carbon dioxide?

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✅EvaluateQuestion 11 of 22

In a balanced equation, why are coefficients used instead of changing subscripts?

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✅EvaluateQuestion 12 of 22

What kind of reaction occurs when iron reacts with copper(II) sulfate solution?

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✅EvaluateQuestion 13 of 22

Which statement best describes combustion reactions?

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✅EvaluateQuestion 14 of 22

When magnesium reacts with dilute hydrochloric acid, which gas is evolved?

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✅EvaluateQuestion 15 of 22

Which observation confirms that a redox reaction has taken place?

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✅EvaluateQuestion 16 of 22

A student heats blue copper(II) carbonate powder. What product and colour change would they observe?

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✅EvaluateQuestion 17 of 22

Which of the following best explains why equations must be balanced?

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✅EvaluateQuestion 18 of 22

Which of the following represents a precipitation reaction that could occur in Caribbean lab practice?

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✅EvaluateQuestion 19 of 22

During the reaction of zinc and hydrochloric acid, which species is reduced?

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✅EvaluateQuestion 20 of 22

A solution of lead(II) nitrate is mixed with potassium iodide. What would be observed?

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✅EvaluateQuestion 21 of 22

Which reaction is both exothermic and involves oxidation?

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✅EvaluateQuestion 22 of 22

Which of the following summarises key points about chemical reactions?

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✅EvaluateQuestion 1 of 22

Which of the following correctly represents the Law of Conservation of Mass?

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