Science Quiz on Reactions and Properties

A student observes that when an iron nail is placed in copper sulfate solution, the solution changes from blue to green. What is the most likely reason for this color change?

• Formation of iron sulfate

• Formation of copper oxide

• Evaporation of water

• Decomposition of copper sulfate

Which of these metals can displace zinc from zinc sulfate solution?

• Copper

• Silver

• Magnesium

• Gold

When preparing copper chloride by reacting copper carbonate with hydrochloric acid, what observation indicates the reaction is complete?

• The solution turns blue

• Bubbling stops

• A white precipitate forms

• The temperature decreases

The diagram shows two beakers: Beaker 1: Zinc in copper sulfate solution Beaker 2: Copper in zinc sulfate solution Which beaker will show a reaction?

• Only Beaker 1

• Only Beaker 2

• Both beakers

• Neither beaker

What is the correct word equation for the reaction between magnesium and sulfuric acid?

• Magnesium + sulfuric acid → magnesium sulfate + hydrogen

• Magnesium + sulfuric acid → magnesium oxide + sulfur dioxide

• Magnesium + sulfuric acid → magnesium sulfide + water

• Magnesium + sulfuric acid → magnesium hydroxide + hydrogen

A student filters a mixture of sand and salt solution. What is collected in the filter paper?

• Pure salt

• Sand and salt

• Pure sand

• Salt solution

Which of these is NOT needed when preparing a salt by crystallization?

• Bunsen burner

• Filter paper

• Measuring cylinder

• Funnel

The table shows reactivity of four metals: Metal Reaction with water P Violent Q Slow R None S Moderate Which metal would displace iron from iron oxide?

• Only P

• P and S

• Q and R

• All four

What happens when silver is added to copper nitrate solution?

• The silver dissolves

• Copper metal forms

• The solution turns yellow

• No visible change

Which salt preparation method would be suitable for making copper sulfate from copper oxide and sulfuric acid?

• Titration

• Filtration and evaporation

• Distillation

• Chromatography