Question

1. identify the reaction type shown here.

2ca + o₂ → 2cao
show the reaction types summary table.
double replacement
combination
decomposition
no reaction
single replacement
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Explanation:

1. First, recall the definitions of different reaction types:

• Combination Reaction: A reaction where two or more substances combine to form a single product. The general form is \( A + B

ightarrow AB \).

• Decomposition Reaction: A reaction where a single compound breaks down into two or more simpler substances. General form: \( AB

ightarrow A + B \).

• Single Replacement Reaction: A reaction where one element replaces another element in a compound. General form: \( A + BC

ightarrow AC + B \).

• Double Replacement Reaction: A reaction where the positive and negative ions of two ionic compounds exchange places. General form: \( AB + CD

ightarrow AD + CB \).

1. Now, analyze the given reaction \( 2\text{Ca} + \text{O}_2

ightarrow 2\text{CaO} \):

• In this reaction, calcium (Ca) and oxygen (\( \text{O}_2 \)) are combining to form a single product, calcium oxide (CaO).
• This fits the definition of a combination reaction (also known as a synthesis reaction), where multiple reactants combine to form one product.
• It does not fit decomposition (since it's forming a product, not breaking down), single replacement (no element is replacing another in a compound), or double replacement (no two compounds exchanging ions) reaction types. Also, it is not a "No Reaction" as the reaction clearly occurs.

Answer:

Combination