Question

1. look at the equation and identify the kind of reaction it represents.

c + o = co
synthesis
decomposition

1. look at the equation and identify the kind of reaction it represents.

co = c + o
synthesis
decompostion

1. one molecule of water, h2o, always contains two hydrogen atoms and ______ oxygen atom (s).

one
two
three

Explanation:

Question 8

A synthesis reaction combines substances into one. Here, \( C \) and \( O \) combine to form \( CO \), matching synthesis. Decomposition breaks down, which is not the case here.

A decomposition reaction breaks a compound into simpler substances. Here, \( CO \) breaks into \( C \) and \( O \), so it's decomposition (note: "decompostion" is likely a typo for decomposition). Synthesis combines, which is not this case.

The formula \( H_2O \) means 2 hydrogen atoms and 1 oxygen atom (the subscript 1 is implied for \( O \) in \( H_2O \)).

Answer:

A. synthesis

Question 9