A 4.4 gram sample of a hydrate was heated until the water of hydration was driven off. The anhydrous compound remaining had a mass of 3.3 grams. What is the percentage by mass of water in the hydrate?

• 75%

• 33%

• 67%

• 25%

Tags

NGSS.MS-PS1-5

What is the chemical formula for iron(III) chloride hexahydrate?

• FeCl3·6H2O

• FeCl3·3H2O

• Fe2Cl6·6H2O

• Fe3Cl6·H12O3

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?

• MgCO₃ · 5H₂O

• MgCO₃ · 4H₂O

• MgCO₃ · 6H₂O

• MgCO₃ · H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

The word carbohydrate comes from the French term hydrate de carbone which means ______________.

• hydrates of sugar

• hydrates of milk

• hydrates

• hydrates of carbon

Tags

NGSS.HS-LS1-6

Carbohydrates are sometimes called _____________.

• saccharide

• monosaccharide

• disaccharide

• polysaccharide

It is the simplest carbohydrates or the simplest sugars.

• saccharides

• monosaccharides

• disaccharides

• polysaccharides

A hydrate of magnesium chloride is present and the following data is collected:

mass of crucible = 22.05 grams

mass of crucible + hydrate = 25.95 grams

mass of crucible and contents after heating = 23.19 grams

What is the percentage of water in this hydrate?

Tags

NGSS.HS-PS1-7