Question

1. choose the best answer.

what phase of matter are all the compounds in for this reaction?
○ gas
○ liquid
○ solid

1. choose the best answer.

what is the coefficient of o₂?
○ 10
○ 2
○ 13
○ 8

Explanation:

Question 3:

To determine the phase of matter for compounds in a reaction, we consider common reaction types. For example, combustion reactions often involve gaseous reactants (like hydrocarbons and \(O_2\)) and gaseous products (like \(CO_2\) and \(H_2O\) vapor). So if it's a combustion reaction, the phase is likely gas.

For balancing a combustion reaction (e.g., of a hydrocarbon \(C_xH_y\) or \(C_xH_yO_z\)), the general approach is to balance C, H, then O. For example, for \(C_4H_{10}\) combustion: \(2C_4H_{10}+13O_2
ightarrow8CO_2 + 10H_2O\). Here, the coefficient of \(O_2\) is 13.

Answer:

A. gas

Question 4: