Why Does Water Go Stale?

Besides H2O molecules, what else can be found in drinking water that affects its taste over time?

• Only H2O molecules

• Other ions and molecules

• Sugar and salt

• Food coloring

When carbon dioxide from the air dissolves in water, what does it form that makes the water slightly acidic?

• Oxygen gas

• Carbonic acid

• Hydrogen peroxide

• Methane

Why do water treatment centers sometimes add compounds containing chlorine to tap water?

• To make it taste better

• To make it fizzy

• To purify it by killing bacteria and viruses

• To make it colder

How do cold temperatures generally affect the taste of water?

• They amplify the flavors.

• They make the water sweeter.

• They suppress the taste.

• They add new flavors.