Hydrates

Question 1

What is the most important reason for using hydrates in fire extinguishers?

Revolt · Accepted Answer

They create foams that have high water content to help extinguish fires.

Question 2

Which is the correct name for MgSO4•7H2O?

Revolt · Accepted Answer

magnesium sulfate heptahydrate

Question 3

Which best specifies the function of hydrates in a wound dressing?

Revolt · Accepted Answer

to promote healing by keeping wound areas moist and sterile

Question 4

Which best describes a hydrate?

Revolt · Accepted Answer

It has water molecules incorporated into its crystal lattice.

Question 5

Which application of hydrates relies on the anhydrous compound’s ability to absorb water?

Revolt · Accepted Answer

fuel filter

Question 6

If 15.60 g of a hydrated compound is heated in an oven for several hours, its mass drops to 8.63 g. Assuming that the reduction in mass is due to loss of water, what is the percentage of water in the original hydrate? Use the formula

Revolt · Accepted Answer

44.7%

Question 7

A sample of a hydrate has a mass of 5.026 g. After it is heated, it has a mass of 3.492 g. What is the percentage by mass of water in the hydrate?Use the formula

Revolt · Accepted Answer

30.52%

Question 8

Which term refers to compounds that can form hydrates but do not contain water molecules?

Revolt · Accepted Answer

anhydrous

Question 9

How are anhydrous compounds often used in various toy products?

Revolt · Accepted Answer

to make small creatures expand they are when placed in water

Question 10

A 2.000-g sample of a hydrated copper sulfate is heated, and the waters of hydration are removed. If the mass of the remaining salt is 1.278 g, what was the percentage of water in the original hydrate?Use the formula

Revolt · Accepted Answer

36.1%

Hydrates Answers

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