Anhydrate and Hydrated Compound Definitions
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Questions and Answers

What is the meaning of 'anhydrate' in chemistry?

  • A compound that contains water molecules
  • The removal of water from a hydrated compound (correct)
  • A compound that has water chemically bonded to another element or compound
  • A compound that has not been exposed to water

What happens to a hydrate when it is heated?

  • It becomes more stable
  • It gains more water molecules
  • It turns into an anhydrate
  • The water molecules break free and evaporate (correct)

How is an unknown hydrate typically represented in its formula?

  • With 'n' before the compound to represent the unknown moles of water (correct)
  • By adding 'hydrated' after the compound name
  • With 'H' in the formula
  • By using a subscript number next to water molecules

Why does heating a hydrate lead to the loss of its crystalline structure?

<p>The water molecules break free and evaporate (C)</p> Signup and view all the answers

What is the empirical formula of a hydrate?

<p>'nH' (C)</p> Signup and view all the answers

In chemistry, what does 'hydrate' mean?

<p>Supplying water to something (C)</p> Signup and view all the answers

How is 'anhydrate' different from 'hydrate'?

<p>'Anhydrate' has had its water removed while 'hydrate' has not (D)</p> Signup and view all the answers

What is the first step in finding the formula of a hydrate?

<p>Measure the compound before heating (C)</p> Signup and view all the answers

In finding the formula of a hydrate, what is Step 4 used for?

<p>Converting anhydrate mass to moles (D)</p> Signup and view all the answers

What role does Step 5 play in determining the formula of a hydrate?

<p>Finding the water to anhydrate mole ratio (A)</p> Signup and view all the answers

In Example Two, what was the mass of water removed when heating the Epsom salt hydrate?

<p>90 grams (A)</p> Signup and view all the answers

When finding the formula of a hydrate, what does the mole ratio help determine?

<p>Water to anhydrate mole ratio (A)</p> Signup and view all the answers

What happens when a hydrate compound is heated?

<p>It releases water vapor (D)</p> Signup and view all the answers

What distinguishes a hydrate compound from an anhydrate compound?

<p>Contains water molecules (C)</p> Signup and view all the answers

What is the primary characteristic of an anhydrate in chemistry?

<p>Has had water removed (A)</p> Signup and view all the answers

Why are hydrates often in crystalline form in chemistry?

<p>To bond with ions (B)</p> Signup and view all the answers

What is the significance of the 'n' in the formula of an unknown hydrate?

<p>Indicates the number of moles of water (A)</p> Signup and view all the answers

What happens to the crystalline structure of a hydrate when it is heated?

<p>It breaks down and loses its structure (B)</p> Signup and view all the answers

What is the key difference between a hydrated compound and an anhydrate?

<p>Presence of chemically bonded water (A)</p> Signup and view all the answers

In chemistry, what does it mean when a compound is described as being 'an'hydrate?

<p>It has lost water molecules (D)</p> Signup and view all the answers

What role does heating play in the transformation of a hydrate into an anhydrate?

<p>Causes removal of water molecules (C)</p> Signup and view all the answers

In Example One, if there are three moles of water for every one mole of anhydrate, what is the hydrate formula?

<p>3:1 (D)</p> Signup and view all the answers

When determining the amount of water removed from a hydrate, which equation should be used?

<p>Mass of hydrate - Mass of anhydrate = Mass of water (C)</p> Signup and view all the answers

What is the significance of step 2 when finding the formula of a hydrate?

<p>Determining the amount of water removed (C)</p> Signup and view all the answers

Why is it important to find the water to anhydrate mole ratio when determining the formula of a hydrate?

<p>To write the correct formula (B)</p> Signup and view all the answers

What would be the correct formula when there are 0.03 moles of water and 0.06 moles of anhydrate?

<p>2:1 (A)</p> Signup and view all the answers

What is the purpose of converting the mass of water to moles when finding the formula of a hydrate?

<p>To convert grams to moles (A)</p> Signup and view all the answers

In Example Two, why is it necessary to find the mass of the anhydrate?

<p>To determine the amount of water removed (D)</p> Signup and view all the answers

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