INTRODUCTION TO BIOMOLECULE

What a water molecule made up from

• 1 atom of hydrogen & 2 atom of oxygen

• 2 atom of hydrogen & 1 atom of oxygen

• 1 atom of chlorine & 1 atom of sodium

• 1 atom of hydrogen & 1 atom of oxygen

Why does ice floats on water because

• Adhesion forces

• Cohesion forces

• Water expands when it freezes

• Water shrinks when it freezes

Which phenomenon explain why oil & water doesn’t mix?

• Hydrophilic effect

• Hydrophobic effect

• An emulsifier

• Water act as A buffer

What is osmosis?

• Diffusion of water molecules through a semi-permeable membrane from an area of low concentration to an area of high concentration

• The diffusion of particles from an area of high concentration to an area of low concentration

• Diffusion of water molecules through a semi-permeable membrane from an area of high concentration to an area of low concentration

• The diffusion of particles from an area of low concentration to an area of high concentration

What is diffusion?

• When molecules move from a low concentration to a high concentration

• No movement

• When molecules move from high concentration to a low concentration

• Molecules move everywhere

What is Ionization?

• Ionisation is defined as the process by which an atom or molecule gains or loses a positive or negative charge as a result of chemical changes.

• Ionisation is defined as the process by which an atom or molecule gains or loses a positive or negative charge as a result of electrical changes.

• True

• False

How Arrhenius theory explain meaning of acid?

• A substance which can denote proton

Which of the following statement describe the meaning of buffer?

• A solution which have ability to resist pH change

• A solution which have ability to resist a pH increase

• A solution have ability to prevent pH from decreasing

• A solution have ability to resist pH change when small amount of acid added

What is the weak acid used in bicarbonate buffer?