B12 Bioc (1) The chemistry of life

What element makes up most of the mass in organisms?

• Oxygen

• Hydrogen

• Carbon

• Water

How do we find the mass number of an element?

• It is the number of protons

• It is the number of neutrons

• It is protons + neutrons

• It is protons + neutrons + electrons

How do isotopes differ?

• Different number of protons

• Different number of neutrons

• Different number of electrons

• More than one answer is correct

The region of space occupied by electrons is known as the

• Shell

• Orbital

• Valence

• Layer

What is the outermost occupied electron shell called?

• The valence shell

• The orbital shell

• The bonding shell

• The proton shell

What type of bond is formed by sharing electrons?

• Ionic bond

• Covalent bond

• Metallic bond

• Semi-ionic bond

A positive ion is called a

• Cation

• Anion

• P-ion

• Dogion

What type of compound will have a partial positive and negative charge?

• Polar covalent

• Non-polar covalent

• Ionic

• Metallic

Which of the following experience van der Waal forces?

• Polar covalent

• Non-polar covalent

• Both are correct

True or false, intra-molecular forces are stronger than inter-molecular forces.

• True

• False