C.3 Lesson 10 Exit Ticket

What is the primary problem discussed in the reading passage?

• The overabundance of copper in the Earth's crust.

• The difficulty of filtering copper ions from water.

• The harmful effects of calcium carbonate in water.

• The lack of uses for copper in modern technology.

Why are copper ions difficult to remove from water using traditional filters?

• They are chemically bonded to water molecules.

• They are too small to be trapped by most filters.

• They carry a positive charge that repels filters.

• They react with filter materials and become soluble.

What is the purpose of adding a substance containing negative ions to copper-contaminated water?

• To neutralize the charge of the copper ions.

• To dissolve the copper ions and make them easier to filter.

• To form a precipitate with the copper ions.

• To break down the copper ions into harmless substances.

What is a precipitate?

• A dissolved compound.

• A solid compound that forms from a solution.

• A liquid compound that is easily filtered.

• A gaseous compound that evaporates quickly.

Which of the following represents the general process of copper removal described in the passage?

• Filtration -> Dissolution -> Precipitation

• Dissolution -> Precipitation -> Filtration

• Precipitation -> Filtration -> Dissolution

• Filtration -> Precipitation -> Dissolution

What are the two compounds tested for their effectiveness in removing copper?

• Sodium chloride and potassium iodide

• Calcium carbonate and calcium hydroxide

• Copper sulfate and iron oxide

• Silver nitrate and lead acetate

What does "(aq)" indicate in a chemical equation?

• Solid state

• Liquid state

• Gaseous state

• Aqueous (dissolved in water) state

What were the five different ratios tested in the research?

• Ratios of copper to water

• Ratios of calcium compound to copper

• Ratios of water to calcium compound

• Ratios of copper to other metals

According to the passage, which compound was slightly more effective at removing copper when smaller amounts of copper were present?

• Calcium hydroxide

• Calcium carbonate

• Both were equally effective.

• Neither was effective.

What is a potential direction for future research mentioned in the passage?

• Testing the removal of other metals alongside copper.

• Developing more efficient filtration methods.

• Studying the long-term effects of calcium in water.

• Finding new sources of copper.