Acids, bases and salts

Complete the definition below:

Acids are....

• hydrogen donors.

• hydrogen acceptors.

• proton donors.

• proton acceptors.

A substance has a pH value of 8. It is most likely to be what?

• Strong acid

• Weak acid

• Strong base

• Weak base

Which indicator is colourless in acid and pink in alkali?

• Litmus

• Phenolphthalein

• Universal Indicator

• Methyl Orange

Which is the correct sequence of steps to make a pure sample of a soluble salt?

• Add excess acid to base, filter acid, evaporate half of solution, leave to crystallise, remove crystals and dry them with filter paper.

• Mix two soluble solutions and filter off the insoluble salt. Dry the salt.

• Add excess base to acid, filter excess base, evaporate half of solution, leave to crystallise, remove crystals and dry them with filter paper.

• Add UI to acid and add base until UI turns green. Evaporate half of solution, leave to crystallise, remove crystals and dry them with filter paper.

Complete this equation:

sulfuric acid + potassium hydroxide -->

• potassium oxide + hydrogen

• potassium chloride + water

• potassium sulfate + hydrogen

• potassium sulfate + water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What acid is needed to make copper nitrate?

• Hydrochloric

• Nitric

• Sulfuric

• Phosphoric

Which equation is balanced?

• H₂SO₄ + NaOH --> Na₂SO₄ + H₂

• H₂SO₄ + 2NaOH --> Na₂SO₄ + H₂

• H₂SO₄ + 2NaOH --> Na₂SO₄ + H₂O

• H₂SO₄ + 2NaOH --> Na₂SO₄ + 2H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which list of salts are all insoluble in water?

• Lead sulfate, copper carbonate, silver chloride

• Copper sulfate, sodium carbonate, potassium chloride

• Sodium sulfate, ammonium carbonate, magnesium chloride

• Potassium sulfate, potassium carbonate, copper chloride

What colour does UI turn in a solution of pH 6?

• Red

• Yellow

• Dark green

• Turquoise

What s made when a proton reacts with a hydroxide ion?

• Water

• An acid

• An alkali

• A salt