Year 10 revision

What type of indicator turns red, yellow, green and blue

What color does phenolphthalein changes when it is reacts with acid?

Which of these range is correct for Phenolphthalein indicator

• 4-7

• 11-14

• 1-4

• 9-10

Which indicator is changes colour when the pH level between 4~6?

• Phenol phthalein

• Methyl orange

• Methyl violet

• Thymol phthalein

What colour does methyl orange turn in alkali?

• Orange

• Yellow

• red

• Pink

What would you increase, to increase the kinetic energy of particles involved in a chemical reaction? (one word answer)

1. Copper(II) oxide catalyses the decomposition of hydrogen peroxide to form oxygen.

In acting as a catalyst the copper(II) oxide?

• prevents the decomposition of the oxygen formed

• increases the total amount of oxygen formed

• increases the rate at which oxygen is formed

• causes the decomposition to begin

Crude oil is a mixture of ....

What fraction of crude oil is used for pavements and roads?

Group 1 elements are called