Ice Breaking with Salts

What is salt?

• Ionic compound formed when hydrogen ion, H⁺ in an acid is replaced with a metal ion or ammonium ion, NH₄⁺.

• Ionic compound formed when hydroxide ion, OH- in an alkali is replaced with a metal ion or ammonium ion, NH₄⁺

Acid + Alkali (Base) will produce?

• Salt

• Water

• Salt and Water

Which of the following are the physical characteristics of salt crystal?

I - Similar size

II - Fixed angle

III - Fixed geometrical shapes

IV - Flat surface, straight edges and sharp angels

• I, II and III

• I, II and IV

• I, III and IV

• II, III and IV

What are the products when magnesium with sulphuric acid?

• Magnesium oxide + Hydrogen

• Magnesium sulfate + Hydrogen

• Magnesium sulfide + Hydrogen

Which of the following is NOT a use of a salt as a food preservative?

• Common salt, NaCl to prepare salted fish

• Sodium nitrite, NaNO₂ to preserve sausages

• Ammonium sulfate, (NH₄)₂SO₄ to preserve fruit jam

Which of the following is not true?

• All nitrate salt are soluble

• All sulphates are soluble except Copper (II) sulphate, Barium sulphate and Lead (II) sulphate.

What is the colour of hydrated Copper (II) sulphate?

• Pink

• Blue

• White

• Brown

Which of the following salts dissolves only when hot?

• KCl

• NaCl

• PbCl₂

State a reason why filtration is carried out during the preparation of Copper (II) sulphate when copper (II) oxide is added to dilute Sulphuric (VI)?

• To remove water

• To dry Copper (II) Sulphate

• To remove unreacted Copper (II) oxide

• To speed up the rate of reaction

Which of the following salts is insoluble?

• Sodium chloride

• Calcium carbonate

• Copper (II) Sulphate