Question

part 2: the five types of chemical reactions

1. synthesis - two or more substances combine to form one____product. example: 2h₂ + o₂ → 2____
2. decomposition - one compound breaks down into two or more____. example: 2h₂o → 2h₂ +____
3. single replacement - one element replaces another in a____. example: zn + 2hcl → zncl₂ +____
4. double replacement - two compounds exchange____to form two new compounds. example: nacl + agno₃ → nano₃ +____
5. combustion - a hydrocarbon reacts with____to produce__and__. example: ch₄ + 2o₂ → co₂ + 2____

Explanation:

1. In synthesis reactions, two or more substances combine to form one product. For the example \(2H_2 + O_2\to2H_2O\), the product is water (\(H_2O\)).
2. Decomposition reactions break one compound into two or more products. For \(2H_2O\to2H_2+\underline{}\), the missing product is \(O_2\) (oxygen gas).
3. Single - replacement reactions involve one element replacing another in a compound. For \(Zn + 2HCl\to ZnCl_2+\underline{}\), the missing product is \(H_2\) (hydrogen gas).
4. Double - replacement reactions exchange ions.
5. Combustion reactions of hydrocarbons react with \(O_2\) (oxygen) to produce \(CO_2\) (carbon dioxide) and \(H_2O\) (water). For \(CH_4 + 2O_2\to CO_2+2\underline{}\), the missing product is \(H_2O\).

Answer:

1. one; \(H_2O\)
2. products; \(O_2\)
3. \(H_2\)
4. ions
5. \(O_2\); \(CO_2\); \(H_2O\); \(H_2O\)