What is the correct name for the compound, CaSO4•2H2O?

• carbon sulfate dihydrate

• calcium sulfur oxide dihydrate

• calcium sulfide dihydrate

• calcium sulfate dihydrate

• calcium sulfite dihydrate

any chemical compound that is loosely bound with water; compound that has water chemically attached to its ions

• Hydrate

• anhydrous

• free water

• Intermolecular

full of water

• anhydrous

• Hydrated

• bound water

• free water

Tags

NGSS.MS-ESS2-4

What is the percent by mass of water in the hydrate CuSO4•5H2O?

• 36.08%

• 45.12%

• 51.14%

• 63.21%

Which of the following is a correct definition of a hydrate?

• A compound that contains water molecules within its crystal structure

• A compound that is completely dry

• A compound that reacts violently with water

• A compound that dissolves in water

What is the chemical formula for gypsum, a common hydrate?

• CaSO4•2H2O

• CaCO3•H2O

• Na2SO4•10H2O

• MgSO4•7H2O

In an experiment, a hydrate is heated to remove water. What is the remaining substance called?

• Anhydrous salt

• Hydrated salt

• Deliquescent salt

• Efflorescent salt

Which of the following hydrates is used in the construction industry as plaster?

• Gypsum (CaSO4•2H2O)

• Epsom salt (MgSO4•7H2O)

• Borax (Na2B4O7•10H2O)

• Blue vitriol (CuSO4•5H2O)

What happens to the mass of a hydrate when it is heated and loses water?

• The mass decreases

• The mass increases

• The mass remains the same

• The mass fluctuates

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5