Question

classify the following chemical reaction.
si(s) + 2cl₂(g) ---> sicl₄(l)
single replacement
combustion
double replacement
composition/ synthesis
decomposition
question 9
1 pts
which example in the video demonstrates a decomposition reaction?
methane reacting with oxygen
water breaking down into hydrogen and oxygen
sodium replacing hydrogen in hydrochloric acid
copper sulfate reacting with sodium carbonate

Explanation:

• For the first reaction \(Si_{(s)}+2Cl_{2(g)}\to SiCl_{4(l)}\):
• A composition/synthesis reaction is one where two or more reactants combine to form a single product. Here, silicon (\(Si\)) and chlorine (\(Cl_{2}\)) combine to form \(SiCl_{4}\).
• For the decomposition reaction question:
• A decomposition reaction is one where a single reactant breaks down into two or more products. Water (\(H_{2}O\)) breaking down into hydrogen (\(H_{2}\)) and oxygen (\(O_{2}\)) (\(2H_{2}O\to 2H_{2}+O_{2}\)) is a decomposition reaction. Methane reacting with oxygen (\(CH_{4}+2O_{2}\to CO_{2}+2H_{2}O\)) is a combustion reaction. Sodium replacing hydrogen in hydrochloric acid (\(2Na + 2HCl\to 2NaCl+H_{2}\)) is a single - replacement reaction. Copper sulfate reacting with sodium carbonate (\(CuSO_{4}+Na_{2}CO_{3}\to CuCO_{3}+Na_{2}SO_{4}\)) is a double - replacement reaction.

Answer:

• For \(Si_{(s)}+2Cl_{2(g)}\to SiCl_{4(l)}\): Composition/Synthesis
• For the decomposition reaction example: Water breaking down into hydrogen and oxygen