Gemma Young and Mark Levesley Solutions for Exercise 13: End of chapter review

A carbonate was added to an acid to make a salt.potassium chloride. Write the word equation for this.

Deep added an unknown compound (X) to some hydrochloric acid. Bubbles were formed.

Describe how he could find out if the gas was hydrogen or carbon dioxide.

Deep added an unknown compound (X) to some hydrochloric acid. Bubbles were formed. He discovers that the gas is carbon dioxide.What does this show about compound X. 

Deep added an unknown compound (X) to some hydrochloric acid. Bubbles were formed. He can not name compound X. Explain why.

A teacher measured the mass of a piece of iron wool (fine strands of iron) as $3.6$ g. She used tongs to hold the iron in a Bunsen flame. She noticed it turned darker and dull in colour. She let it cool and then measured the mass again. It was now $3.9$ g.

Describe what happened to the mass of the iron when it was heated.

A teacher measured the mass of a piece of iron wool (fine strands of iron) as $3.6$ g. She used tongs to hold the iron in a Bunsen flame. She noticed it turned darker and dull in colour. She let it cool and then measured the mass again. It was now $3.9$ g.

Use the particle model to explain why this happened.

When paper is burnt, its mass decrease. Explain why?

Use the formula below to draw a particle diagram to show the reaction between calcium and sulphuric acid.

Sulphuric acid ${\mathrm{H}}_2{\mathrm{SO}}_4$

Calcium sulphate ${\mathrm{CaSO}}_4$