Preparation of salts

Bryan wants to prepare silver chloride in the science laboratory. Which of the following reactants should he use?

• silver + hydrochloric acid

• silver hydroxide + hydrochloric acid

• silver nitrate + potassium chloride

• silver + chlorine gas

For making sure that one reactant is completely used, the other reactant must be added in excess.

• true

• false

Calcium chloride is prepared from ______________ and hydrochloric acid

• Calcium carbonate

• Calcium

• all of the above

Which of the following are the functions of calcium chloride? Choose two

• Absorb moisture from air and known as drying agent

• Used to speed up the setting of concrete

• Making cosmetics

• Treatment of sewage

When magnesium + hydrochloric acid, the products are

• magnesium nitrate + hydrogen

• Magnesium chloride + hydrogen

• Magnesium chloride + carbon dioxide + water

• Magnesium chloride + oxygen

In the reaction of metal carbonate and acid, the marble chips are added twice as the first one dissolve. Why does it dissolve?

• The marble chips does not fully reacts with the acid

• No bubbles of carbon dioxide produce in the first addition

• Marble chips fully react with acid to produce carbon dioxide

• To make sure acids will be in excess before the next step

Why do we need to filter the salt solution?

• To make sure the residue is collected in the beaker

• To separate the excess metal and get the filtrate

• To allow the acid does not react anymore with the metal

• To produce more bubbles of gas

What is the 3rd step in the preparation of salt?

• filtration

• crystallization

• evaporation

• mixing

Which of the following are true about the last step of preparation of salt? Choose two.

• Solution is heated gently until solid appears

• Solution is left to cool

• Solution is filtered in the filter funnel

• Filtered the salt onto the filter paper allow more evaporation to take place

Sodium carbonate + nitric acid -->

• Sodium nitrate + carbon dioxide + hydrogen

• Sodium nitrate + water + hydrogen

• Sodium nitrate + carbon dioxide + water

• Sodium nitrate + hydrogen