Question

what reaction type occurs when ethanol reacts with oxygen and releases energy in the form of heat and light?
synthesis
combustion
decomposition
double replacement
question 5
1 pts
in the \gummy bear walks the plank\ demonstration, what is the catalyst?
sugar
potassium chlorate
water
oxygen
question 6
1 pts
which reaction demonstrates a single replacement reaction using a metal and water?

Explanation:

• For the first question: Combustion reactions involve a substance reacting with oxygen to release energy (in the form of heat and light). Ethanol (\(C_2H_5OH\)) reacting with \(O_2\) is a combustion reaction. Synthesis reactions combine two or more substances to form one product. Decomposition reactions break a single substance into two or more products. Double - replacement reactions involve the exchange of ions between two compounds.
• For the second question: In the "gummy bear walks the plank" demonstration, potassium chlorate (\(KClO_3\)) is heated. When a gummy bear (which contains sugar, a hydrocarbon) is added, the reaction is a redox reaction. Potassium chlorate acts as an oxidizing agent (not a catalyst, but among the given options, if we consider the role in facilitating the reaction in the context of the demonstration setup, and since sugar is the reactant, water and oxygen are not the key substances in terms of the main reaction - facilitating role as per the common understanding of this demo).
• For the third question: Sodium (\(Na\)) reacts with water (\(H_2O\)) in a single - replacement reaction. The reaction is \(2Na + 2H_2O=2NaOH + H_2\uparrow\). In a single - replacement reaction, one element replaces another in a compound.

Answer:

• First question: Combustion
• Second question: Potassium chlorate
• Third question: Sodium and water