Salts and Chemical Tests ( YEAR 11)

Acid + Carbonate yields _____________________

• Salt + Hydrogen

• Salt + Water + Carbon Dioxide

• Salt + Water

• Salt + Alkali

When you place blue litmus paper into an unknown clear solution, the blue litmus paper turns red.

Which of the following represents the most logical conclusion?

• The substance has a pH value of "2".

• The substance is a base.

• The substance has a pH value of "7".

• The substance is acidic.

I have 25mL of 1M HCl which neutralises 20mL of NaOH. What is the concentration of the NaOH?

• 0.8 M
• 1 M
• 1.25 M

Tags

NGSS.HS-PS1-7

Ocean water has a pH value near "8". It would be classified as...

• slightly acidic

• a strong base

• a neutral substance

• slightly basic (alkaline)

Which indicator is colourless in acid and pink in alkali?

• Litmus

• Phenolphthalein

• Universal Indicator

• Methyl Orange

Complete the definition below:

Acids are....

• hydrogen donors.

• hydrogen acceptors.

• proton donors.

• proton acceptors.

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.

Which equation is balanced?

• H₂SO₄ + NaOH --> Na₂SO₄ + H₂

• H₂SO₄ + 2NaOH --> Na₂SO₄ + H₂

• H₂SO₄ + 2NaOH --> Na₂SO₄ + H₂O

• H₂SO₄ + 2NaOH --> Na₂SO₄ + 2H₂O

Tags

NGSS.HS-PS1-7

Metal + Steam yields ___________

• Metal Oxide + Hydrogen

• Metal Hydroxide + Hydrogen

• A + B

• Metal Oxide

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