LC3 End of Year Chemistry Test

You are heating a substance in a test tube. Always point the open end of the tube

• towards your body
• toward your lab partner
• towards another classmate
• away from all people

_{What is the hazard shown in this hazard sign?}

• Explosive
• Corrosive
• Irritant
• High level Irritant

True or False? "Adding more solute to a saturated solution will increase the amount of solute dissolved in the solution"

• True

• False

When a metal reacts completely to form a metal oxide, the mass of the metal oxide formed will be...

• greater than the mass of the metal used

• less than the mass of the metal used

• the same as the mass of the metal used.

Solubility is a measure of the maximum mass of

• solute that can dissolve in a set mass of solvent

• solution that can dissolve in a set mass of solvent

• solvent that can dissolve in a set mass of solute

• solvent that can dissolve in a set mass of solution

A solubility curve for compound X is shown. Describe the relationship on the solubility curve.

Use the solubility curve to find the maximum mass of compound X that could dissolve in 200g of solvent at 70^oC

• 20

• 22

• 44

• 40

In which state of matter are the particle furthest apart?

• solid

• liquid

• gas

Increasing the temperature of a reaction mixture increases the rate of the reaction because...

• there are fewer collisions

• the energy of the collisions is greater

• there are more particles of reactant in the same volume

Explain in terms of particle collisions, why increasing the concentration of reacting solutions increases the rate of a reaction