7Ec In the Red

The instrument below is ..........

• a thermometer.

• a microscope.

• a pH meter.

• a telescope.

A dye that will change color in acids and alkalis is called an indicator.

• True.

• False.

Potatoes grow well in ............ soil.

• acidic

• alkaline

• neutral

• none of the following

Broccoli grows well in ........... soil.

• acidic

• alkaline

• neutral

• none of the above

What is the pH of water?

• 1.

• 3.

• 7.

• 14.

Predict the color of purple litmus when mixed with sulphuric acid.

• red.

• blue.

• purple.

• yellow.

Predict the color of purple litmus when mixed with tap water.

• red.

• blue.

• purple.

• yellow.

Predict the color of purple litmus when mixed with Clorox.

• Red.

• Blue.

• Purple.

• Yellow.

Which of the following are indicators?

• sulphuric acid, nitric acid, and hydrochloric acid.

• Pepsi, Dr. Pepper and Mountain Dew.

• lemons, limes, and oranges.

• blackberry juice, red cabbage and litmus.

Strong acids that attack metals, stonework and skin are said to be ............

• corrosive.

• dilute.

• irritants.

• harmful.