Learning Objectives

Eman and Fatima are discussing the water quality in their neighborhood. Eman mentions that the water in their area is hard. What does Eman mean by hard water?

• Water that contains a high concentration of minerals

• Water that is free from any impurities

• Water that is chemically treated

• Water that is in a solid state

Fatima and Maha are discussing the water quality in their homes. Fatima mentions that her home has soft water. Which of the following is a characteristic of soft water?

• Contains excess calcium and magnesium

• Free from harsh minerals

• Damages your home and body

• None of the above

Laiba noticed white or yellowish deposits at the bottom and sides of her pan that she regularly uses for boiling water. What causes these deposits?

• Rust formation

• Mineral deposits from hard water

• Food residue

• Chemical reaction with soap

During a science class, Laiba and Fatima were discussing the type of water that leaves spots on dishes after washing. What is this type of water?

• Water with low mineral content

• Water with high mineral content

• Water with no minerals

• Water with only sodium ions

Laiba and Nehj are discussing the quality of water in their neighborhood. They notice that their water leaves spots on dishes and scales in kettles. What ions are likely responsible for this hard water?

• Sodium ions

• Magnesium and calcium ions

• Potassium ions

• Chloride ions

During a science experiment, Nehj and Eman were investigating the cause of temporary hardness in water. What did they find to be the cause?

• Calcium bicarbonate

• Sodium chloride

• Magnesium sulfate

• Potassium nitrate

Fatima and Maha are both working on a science project. Use the 'Open Compare and Contrast' worksheet to compare their projects. How are they alike?

• They have similar characteristics.

• They are completely different.

• They have no similarities.

• They are identical in every way.

Maha and Eman are using the 'Open Compare and Contrast' worksheet to identify patterns of significant similarities and differences between two historical events.

• Identify only similarities

• Identify only differences

• Identify both similarities and differences

• Identify neither similarities nor differences

Eman and Laiba are discussing the quality of water in their homes. Eman mentions that her home has soft water, while Laiba says she has hard water. What is the main difference between the water in their homes?

• Soft water contains high levels of calcium and magnesium, while hard water does not.

• Hard water contains high levels of calcium and magnesium, while soft water does not.

• Soft water is more alkaline than hard water.

• Hard water is more acidic than soft water.