7Ec Making an Ash out of it.

In Arabic, ashes were called al qali.

• True.

• False.

Alkalis turn litmus ............

• red.

• blue.

• purple.

• yellow.

Pure water turns litmus paper what color?

• Red.

• Purple.

• Blue.

• Yellow.

We use the word 'alkali' to describe a group of substances that feel ..........

• soft.

• soapy.

• hard.

• squishy

What is the pH of pure water?

• 1

• 3

• 7

• 10

Salt solutions are .............

• acid.

• neutral.

• alkali.

• none of the above.

Sugar solutions are ................

• acidic.

• neutral.

• alkali.

• none of the above.

Oven Cleaners often contain ..........

• acids.

• alkali.

The following oven cleaner has a hazard symbol indicating it is ...........

• radioactive and an irritant.

• poisonous and harmful.

• flammable and corrosive.

• flammable and an irritant.

Many alkalis are too dangerous to feel.

• True.

• False.