Observations & Chemical Changes Lab Quiz

What is the correct term for a solid forming in a reaction solution?

• Effervescence

• Precipitate

• Filtrate

• Solute

Describe the physical properties of copper metal before the reaction. Include at least three characteristics.

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What is the name of the toxic brown gas produced when copper reacts with nitric acid?

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When sodium hydroxide is added to the solution, a new blue solid appears. What is this compound?

• Copper(II) sulfate

• Copper(II) oxide

• Copper(II) hydroxide

• Copper(II) nitrate

When heating the copper(II) hydroxide, it turns black. What compound is responsible for this color change?

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Match the following separation techniques with their descriptions.

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Why is decanting used in this experiment?

• To remove excess zinc metal

• To separate solid copper from liquid waste

• To dissolve copper into solution

• To measure the volume of the acid added

If the solid copper was lost during decanting, what type of error would this introduce? Explain.

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What does heating to a constant mass ensure?

• That the reaction is complete

• That all the nitric acid is used up

• That the copper has fully dried before measuring

• That gas is produced during the reaction

If the copper is still wet when weighed at the end, how does this affect the mass measurement?

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