Question

1. name the type of reaction (synthesis, decomposition, single displacement, double displacement, or combustion) that occurs given the following evidence. (5 marks)

a) precipitate forms
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b) ch₄ + o₂ → co₂ + h₂o + energy
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c) fe + b → feb
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d) cl₂ + kbr → kcl + br₂
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e) production of gas
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1. indicate whether the following property belongs to an acid, base, or neutral (3 marks)

a) ionic compounds
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b) have a sour taste
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c) ph 4
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1. use the equation below to answer the following questions: (2 marks)

magnesium + oxygen → magnesium oxide
? + 16.0 g → 40.3 g
a) based on the law of conservation of mass, what is the amount of magnesium in grams? ________g
b) based on the law of conservation of mass, what is the total amount of the reactants in grams? ________g

Explanation:

Step1: Apply the Law of Conservation of Mass

The Law of Conservation of Mass states that the mass of reactants is equal to the mass of products. Let the mass of magnesium be \(x\). The reactants are magnesium (\(x\)) and oxygen (\(16.0\) g), and the product is magnesium oxide (\(40.3\) g). So, \(x + 16.0=40.3\).

Step2: Solve for \(x\)

Subtract \(16.0\) from both sides of the equation: \(x=40.3 - 16.0\).

Answer:

a) \(24.3\) g
b) \(40.3\) g