Question

1. in a chemical reaction, what are the new substances produced called?

a) ingredients
c) reactants
b) products
d) chemicals

1. what type of reaction is this? ch₄ + o₂ → co₂ + h₂o

a) synthesis
c) single replacement
e) comb
b) decomposition
d) double replacement

Explanation:

In a chemical reaction, reactants are the starting substances. The substances formed as a result of the reaction are called products. For example, in the reaction \( \text{CH}_4+\text{O}_2
ightarrow\text{CO}_2 + \text{H}_2\text{O}\), \(\text{CH}_4\) and \(\text{O}_2\) are reactants and \(\text{CO}_2\) and \(\text{H}_2\text{O}\) are products.
For the reaction \( \text{CH}_4+\text{O}_2
ightarrow\text{CO}_2 + \text{H}_2\text{O}\), it is a combustion reaction (a type of combination reaction in a broader sense where a substance reacts with oxygen). Synthesis (combination) reactions involve two or more substances combining to form one product. Decomposition is the opposite (one substance breaking into two or more). Single - replacement has the form \(A + BC
ightarrow AC + B\) and double - replacement has the form \(AB+CD
ightarrow AD + CB\).

Answer:

1. B. Products
2. E. Combustion (assuming the option E is Combustion. If not, based on the general reaction type where a hydrocarbon reacts with oxygen to form carbon dioxide and water, it is a type of combination reaction related to combustion)