Chemistry and Physics quiz

Lets start with an easy one!!

What is the chemical formula of water?

• H2O2

• H2O

• H2CO3

• HCl

Which of these elements is a nonmetal?

• Manganese

• Aluminium

• Gold

• Sulfur

Answer explanation

Sulfur is a non-metal. It's yellow and lacks a metallic luster.

The symbol Ag stands for which element?

• Silver

• Argon

• Gold

• Aluminium

Answer explanation

Ag stands for argentum, which is an old name for silver. The term "argent" survives, meaning silvery.

All of the following elements are liquids around room temperature except which one?

• Magnesium

• Mercury

• Galium

• Bromine

Answer explanation

Bromine and mercury are liquid at room temperature. You can melt gallium in the palm of your hand. If you put pure magnesium in your hand, it may react with the water in your skin and ignite, but it won't melt.

You can't live without iron. Where in the body is most of the iron located?

• Liver

• Brain

• Blood

• Bones

Answer explanation

Most of the body's iron is locked up in the hemoglobin found in red blood cells, used for oxygen transport.

A drop of food coloring spreading out in a cup of water is an example of which transport process?

• Osmosis

• Vapour pressure

• Effusion

• Diffusion

Answer explanation

Food coloring dispersing in water is an example of diffusion. Osmosis involves water, but there has to be a semipermeable membrane, too.

What is the most common isotope of hydrogen?

• Protium

• Deuterium

• Tritium

• Hydrogen has no isotope

Answer explanation

Most of the hydrogen in the world is protium (one proton, no neutrons), but some deuterium and tritium occurs, too. Tritium is radioactive. Deuterium is not radioactive and is the form of hydrogen found in heavy water.

DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?

• Whey

• Keratin

• Albumin

• Collagen

Answer explanation

You'll find keratin primarily in your hair, nails, and skin, but the most abundant protein in humans is collagen, which is found in bone and cartilage. Both proteins are strong and flexible.

What do you call an atom that has more protons than electrons?

• Molecule

• Anion

• Cation

• Isotope

Answer explanation

If an atom has more protons than electrons, it has a net positive charge. This is a cation, which you can remember because the "t" in cation resembles a "+" sign for positive.

A mole contains Avogadro's number of items. What is Avogadro's number?

• 6.022 x 10^23

• 6.022 x 10^26

• 6.022 x 10^-23

• 6.022

Answer explanation

Avogadro's number is huge! The reason chemists use 6.02 x 10^23 to define a unit is to avoid having to work with crazy-large numbers.