Chemistry Science questions

The composition of air

• 1% oxygen, 88% nitrogen

• 12% oxygen, 65% nitrogen

• 21% oxygen and 78% nitrogen

• 78% oxygen, 21% nitrogen

Gases responsible for global warming

• Hydrogen and oxygen

• Carbon dioxide and sulfur dioxide

• Nitrogen and Argon

• Ammonia and Sulfur

Which ones are acids?

• milk and soap

• coke and orange juice

• blood and water

• antacid

Which elements are in a glucose molecule?

• N, O, H

• P, O, H

• S, O, H

• H, O, C

How many bonds in molecule of water?

• 2 bonds

• 3 bonds

• 4 bonds

• impossible to count

What is the raw material of paper?

• Crude oil

• Fossil fuel

• Trees

• Stones

Why seawater is undrinkable?

• too many dissolved salts

• pH is neutral

• contains useful nutrients

• don't pick me ;)

What is the most abundant element after oxygen on the earth's crust?

• Nitrogen

• Hydrogen

• Silicon

• Iron

Which one is physical property?

• Corrosion

• Combustion

• Reactivity with oxygen

• Boiling point

Molecular mass of carbon dioxide

• 44 g/mol

• 18 g/mol

• 16 g/mol

• 32 g/mol