Vash Education: Elements, Compounds, Mixtures

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1. Purity

1. What is the definition of purity?

10 points

A substance that is made of more than one compund

A substance that is similar to

A substance made of only one type of element or compound

A new substance produced by a chemical reaction

Clear selection

2. Which of these substances is an impure substance?

10 points

Hydrogen gas

Baking soda

Fruit juice

Ammonia

Clear selection

3. Fill in the missing word. The boiling point of an impure substance is ____ the boiling point of a pure substance.

10 points

Higher than

Lower than

The same as

Clear selection

4. State whether the graph shows a pure or impure substance. (Answer should not include any capital letters)

10 points

5. The melting point of benzoin acid is 122 degrees Celsius and the melting point of citric acid is 153 degrees Celsius. An unknown substance has a melting point of 145 degrees Celsius. Which of the following statements best describes the unknown substance?

10 points

It can be a mixture of both acids

It can not be either of the acids

It can be impure citric acid

It can be impure benzoin acid

Clear selection

6. What is the relative atomic mass of boron? (Give your answer to 3 significant figures)

10 points

7. What is the relative molecular mass of sulfuric acid? (Ar of elements: H=1, S=32.1, O=16)

10 points

8. The chemical formula of the hydrocarbon hexane is C6H14. What is its empirical formula?

10 points

9. The molecular formula of butene is C4H8. A student says its empirical formula is C2H4. Is the student right or wrong?

10 points

10. The empirical formula of a compound is C2H5. The molecular mass of the compound is 58. How many hydrogen atoms are actually present in the compound?

10 points

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