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

b) ch₄ + o₂ ⇒ co₂ + h₂o + energy

c) fe + b ⇒ feb

d) cl₂ + kbr ⇒ kcl + br₂

e) production of gas

1. indicate whether the following property belongs to an acid, base, or neutral (3 marks)

a) ionic compounds

b) have a sour taste

c) ph 4

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 Law of Conservation of Mass

The law states that mass of reactants = mass of products. Let the mass of magnesium be \(x\). Then \(x + 16.0=40.3\).

Step2: Solve for \(x\)

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

Step3: Calculate total mass of reactants

Since mass of reactants = mass of products, and mass of products is \(40.3\) g.

Answer:

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