Lab: Types of Reactions Answers
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Which of the following best explains why you sanded the copper wire before burning it?
Check all of the reasons that you included in your answer.Copper oxide is the only product, and it contains copper and oxygen.One of the reactants is copper, so the other reactant must be oxygen.The copper metal must have combined with something in the air.
H2(g)
1
What signs of a chemical reaction did you observe during the lab? Check all that apply.
Which of the following best explains why you put KI and Pb(NO3)2 into two separate test tubes before mixing them?
When you burned copper, the product copper oxide appeared on the wire. Besides copper, the other reactant is .
oxygen, O2
Question text not available
Silver tarnishes as silver metal reacts with hydrogen sulfide, H2S, in the air. In this reaction, dark silver sulfide, Au2S, covers the surface of silver. When silver is polished, this coating of silver sulfide can be removed from the surface. This makes the silver shiny again. Enter the coefficients that balance the tarnishing reaction equation. (Type 1 for no coefficient.)
When silver tarnishes, a reaction happens.
How does knowing the reactants and products help you classify a chemical reaction? Write a short paragraph explaining.
Knowing the reactants and products helps you classify a chemical reaction because the specific patterns of how atoms or ions are rearranged define the reaction type. For example, if there is a single product formed from multiple reactants, it is a synthesis reaction. Conversely, if one reactant breaks down into multiple products, it is a decomposition reaction. Recognizing pure oxygen as a reactant identifies a combustion reaction. In single-replacement reactions, an element replaces another in a compound, while in double-replacement reactions, two compounds switch ions. By analyzing these changes, you can categorize the reaction.
Explain how you know it must be oxygen. Where did the oxygen come from?
I know it must be oxygen because the product formed is copper oxide, which consists of copper and oxygen atoms. Since copper was the starting metal, it must have reacted with oxygen from the surrounding air to form the compound.
H2S(g) →
1
Ag2S(s) +
1
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