Free Printable Lesson 3: Hydrates

Worksheets

Lesson 3: Hydrates

Total questions: 20

Worksheet time: 42mins

Name

Class

Date

Na₂CO₃ · 10H₂O is known as sodium carbonate ______

Hydroxide

Hydrate

Decahydrate

None of the above

Name the following hydrate: NaCl * 5H₂O

sodium chloride

sodium monochloride pentahydrate

sodium chloride pentahydrate

pentahydrate

A compound is a hydrate when it...

is composed of only hydrogen and oxygen

is a state of water

contains water in the compound

repels water from the compound

How do you calculate the percent by mass of an element in a compound?

Add up the mass of protons and neutrons, then divide by two.

Divide the mass of the element by the total mass of the compound and multiply by 100.

Add up the atomic masses of the elements, then divide by the number of the elements.

Find the relative mass of any atom by adding the number of protons to the number of neutrons, then dividing by that total number.

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 · 1H₂O

Determine the molar mass for CCl₄

153.8 g/mol

47.54 g/mol

189.35 g/mol

82.9 g/mol

Determine the formula of CuSO₄·?H₂O hydrate given the following data:

Test Tube = 23.56 g

Test Tube + Hydrate = 26.06 g

Test Tube + Anhydrate = 25.16 g

CuSO₄·H₂O

CuSO₄·2H₂O

CuSO₄·4H₂O

CuSO₄·5H₂O

Name the following ionic compound: MgSO₄ • 7H₂O

magnesium sulfide hexahydrate

magnesium sulfite heptahydrate

magnesium sulfate heptahydrate

magnesium sulfide heptahydrate

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?

(a)

10.

A 5.018 gram sample of a certain hydrate of magnesium sulfate, MgSO₄ • xH₂O, is heated until all the water is driven off. The resulting anhydrous compound weighs 2.449 grams. What is the formula of the hydrate?

MgSO4 • 9H2O

MgSO4 • 8H2O

MgSO4 • 7H2O

MgSO4 • 6H2O

11.

Find the percent composition of Cu₂S?

Cu= 67.987%; S= 32.013%

Cu= 79.854%: S= 20.145%

Cu= 35.946%; S= 64.054%

Cu= 39.925%; S= 20.151%

12.

Dried or without water

anhydrate/anhydride

hydrate

grapes

13.

Name Cr(NO₃)₃ ⋅ 9H₂O

Hint:

Remember that Chromium has numerous charge options.

So you show the charge in your answer

chromium nitrate nonahydrate

chromium nitrogen trioxide nonahydrate

chromium (III) nitrate nonahydrate

chromium (I) tritrioxide heptahydrate

14.

Calculate the percent by mass of water in the hydrate FeCl₃ $\cdot$ 6H₂O. Round percent to the tenth place.

(a)

15.

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the waters of hydration. The mass after heating was reduced to 7.58 g. Calculate the percent water by mass in the original hydrate.

7.58 %

8.09%

48.37%

51.63%

16.

A 3.11 g sample of ZnSO₄ ⋅ 7H₂O is heated to dryness. Determine the mass of anhydrous salt remaining after all the water has been driven off.

3.11 g

1.75 g

1.36 g

0.562 g

17.

How do we name a hydrate?

Add "water" to the end of the chemical name

Use a prefix and add hydrate

Do nothing, it does not change

18.

A hydrate is a compound that has a specific number of water molecules bound to its atoms. How many water molecules are bound to the hydrate shown in the circle graph?

19.

What is the best method for removing water from a hydrated compound?

freezing

filtration

distillation

heating

20.

Calculate the percent water by mass in cobalt(II) chloride dihydrate, CoCl₂•2H₂O.

36.0%

78.3%

21.7%

10.9%

13.9%

Reset

Lesson 3: Hydrates

Total questions: 20

Worksheet time: 42mins

Similar Resources on Wayground