2A1 Acid bases and heat

Which of the following is an example of an acid?

• orange juice

• salt

• baking soda

• water

Which of the following is an example of an alkali?

• vinegar

• salt

• vitamin c

• sodium hydroxide

Acids and Alkalis react to form salt and _____. Fill in the blank.

• carbon dioxide

• hydrogen

• water

• base

Which is not an example of how neutralisation reactions are used in daily life?

• using toothpaste

• antacids for acid reflux

• making soil less acidic

• heating up food

What is a possible pH value for an alkali?

• 9

• 7

• 2

• 4

Which of the following turns a red litmus paper turned blue?

• acid

• alkali

• pure water

• salt

An acid turns a blue litmus paper _______. Fill in the blank.

• red

• blue

• green

• white

A red litmus paper remains red when placed in Unknown X. Unknown X must be an acid.

True or False?

• True

• False

True or False? Radiation is the transfer of energy from a hotter body to a cooler body without the need for a medium.

• True

• False

True or False? Shiny, smooth surfaces are better absorbers of radiation than dull, rough surfaces.

• True

• False