Question

what type of reaction occurs when magnesium reacts with oxygen to form magnesium oxide?
single replacement
decomposition
combustion
synthesis
question 2
1 pts
what do you need to predict the products of a single replacement reaction?
a periodic table
a catalyst
a reactivity series
the ph scale
question 3
1 pts
what type of reaction is shown when hydrogen peroxide breaks down in the presence of potassium iodide?

Explanation:

• Question 1: A synthesis reaction is when two or more reactants combine to form a single product. Here, magnesium (\(Mg\)) and oxygen (\(O_2\)) combine to form magnesium oxide (\(MgO\)) (\(2Mg + O_2

ightarrow2MgO\)), so it is a synthesis reaction.

• Question 2: A reactivity series ranks metals (and some non - metals) by their reactivity. In a single replacement reaction (e.g., \(A + BC

ightarrow AC + B\) if \(A\) is more reactive than \(B\)), we need to know the reactivity of the elements involved. A periodic table gives general trends but not specific reactivity for single replacement predictions. A catalyst affects the rate of a reaction, not the products. The pH scale is for measuring acidity/basicity.

• Question 3: When hydrogen peroxide (\(H_2O_2\)) breaks down (in the presence of potassium iodide as a catalyst) into water (\(H_2O\)) and oxygen (\(O_2\)) (\(2H_2O_2

ightarrow2H_2O + O_2\uparrow\)), it is a decomposition reaction (a single reactant breaks down into two or more products).

Answer:

• Question 1: Synthesis
• Question 2: A reactivity series
• Question 3: Decomposition