Properties of Air and Acids

Which of the following is a key property of air?

• Air is visible and has no weight

• Air is invisible but has weight

• Air does not occupy space

• Air cannot exert pressure

Which experiment demonstrates that air occupies space?

• Filling a balloon

• Heating water in a beaker

• Melting ice

• Boiling salt water

What is the most abundant gas in the Earth's atmosphere?

• Oxygen

• Carbon dioxide

• Nitrogen

• Argon

How do we know that air is present around us?

• We can see it

• It is visible in pictures

• We can feel it

• We can taste it

Air is needed for which of the following processes?

• Breathing

• Burning

• Photosynthesis in plants

• All of the above

What happens when air is cooled?

• Air becomes lighter and moves upward

• Air shrinks

• Air disappears

• Air expands and becomes denser

Which of the following is NOT found in air?

• Oxygen

• Nitrogen

• Water vapor

• Gold

What is lemon juice an example of?

• A base

• A salt

• An acid

• A metal

What type of substance is soap?

• Acid

• Base

• Metal

• Salt

How do bases usually feel?

• Rough

• Sticky

• Slippery

• Cold