Question

predict the products of the following combination reaction.
$c(s) + o_2 \
ightarrow$
$\circ$ $co_2$
$\circ$ $o + c$
$\circ$ $c_2o$
$\circ$ $co$
2 true or false 1 point
$a + bx \
ightarrow b + ax$ is the general formula for a single replacement reaction.
$\circ$ true
$\circ$ false
3 true or false 1 point
decomposition reactions occur when an element which is more reactive takes the place of one which is less reactive, thus resulting in two new compounds.
$\circ$ true
$\circ$ false

Explanation:

Question 1 (Combination Reaction Product Prediction)

Step1: Recall Combination Reaction

A combination reaction is when two or more substances combine to form a single product. For carbon (C) and oxygen (\(O_2\)), when there is sufficient oxygen, carbon dioxide (\(CO_2\)) is formed. The reaction is \(C(s)+O_2(g)
ightarrow CO_2(g)\). The other options: \(O + C\) is just the reactants, \(C_2O\) is not a common product, and \(CO\) is formed with limited oxygen, but the standard combination with excess \(O_2\) gives \(CO_2\).

Step2: Evaluate Options

• \(CO_2\): Correct product of \(C + O_2\) (sufficient \(O_2\)).
• \(O + C\): Not a product, just reactants.
• \(C_2O\): Not a valid product here.
• \(CO\): Formed with limited \(O_2\), but the reaction as written (no indication of limited \(O_2\)) gives \(CO_2\).

Step1: Recall Single Replacement Reaction

A single - replacement reaction has the general form \(A + BX
ightarrow AX + B\), where element \(A\) replaces element \(B\) in compound \(BX\). The given formula \(A + BX
ightarrow B + AX\) matches this general form.

Step2: Determine True/False

Since the formula \(A + BX
ightarrow B + AX\) is the correct general formula for a single - replacement reaction, the statement is True.

Step1: Recall Decomposition Reaction

A decomposition reaction is when a single compound breaks down into two or more simpler substances (e.g., \(AB
ightarrow A + B\)). The description given ("an element which is more reactive takes the place of one which is less reactive, thus resulting in two new compounds") is the definition of a single - replacement reaction, not a decomposition reaction.

Step2: Determine True/False

Since the description does not match the definition of a decomposition reaction, the statement is False.

Answer:

\(CO_2\)

Question 2 (Single Replacement Reaction Formula)