LSS Chapter 3: Chemical Properties Quiz

Which of the following statements about the Periodic Table is correct?

• Elements are arranged according to their chemical symbols.

• Metallic elements are found on the right-hand side.

• The zigzag line divides the elements into metals and non-metals.  

• There are more non-metallic elements than metallic elements.

Which of the following substances are elements?

• brass

• sand

• silicon

• water

Which substance will form a suspension with water?

• ethanol

• carbon dioxide

• bread crumbs

• rose syrup

Which statement does not show that seawater is a mixture?

• Seawater contains different substances

• The composition of seawater is not fixed.     

• Water in seawater is a compound.

• The components of seawater can be separated using physical methods.

Which of the following shows the correct classification of substances?

• A

• B

• C

• D

Name the three elements in vitamin C, C6H8O6.

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Answer explanation

Carbon, hydrogen and oxygen

A cup of ‘Redoxon’ drink was prepared by adding one ‘Redoxon’ tablet into a cup of water and stirred. The drink was orange and clear.

(i) State if the cup of ‘Redoxon’ drink is a solution or suspension.

(ii) Explain your answer

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(i) Solution

(ii) Tablet cannot be seen / Solute particles cannot be seen / No insoluble substances can be seen /

Tablet dissolves in the water / no particles left undissolved /

Tablet does not settle at the bottom of the cup / Solute does not settle at the bottom of the cup / No insoluble substances settle at the bottom of the cup /

Light can pass through the drink fully;

Explain why vitamin C is a compound.

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Answer explanation

Constituent elements (carbon, hydrogen and oxygen) are chemically combined in a fixed proportion by mass

Identify the solute and solvent.

Solute:

Solvent:

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Answer explanation

solute: salt

solvent: water

In which beaker, A, B, C or D, does the solute have the fastest rate of dissolving?

Explain your answer.

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Answer explanation

Beaker D.

The salt crystals used are small, stirring and high temperature used speed up the rate of dissolving of the solute.