Chemistry Term Examination I, 2024

Which type of mixture is separated by filtration?

• an insoluble solid from a liquid

• a liquid solvent from a solution

• a dissolved solid from a solution

• a liquid from a mixture of liquids

Which statement explains why diamond is used in cutting tools?

• It has no free electrons.

• It has a high melting point.

• It is colourless.

• It is hard.

Which statement about these two isotopes is correct?

• Their electronic structure is different.

• They have different numbers of nucleons.

• They have different numbers of protons.

• They have the same number of neutrons.

Which two ions are produced?

• K+ and F+

• K+ and F–

• K– and F–

• K– and F+

What is the relative formula mass of ammonium sulfate, (NH4)2SO4?

• 63

• 114

• 118

• 132

What is the arrangement of electrons in one atom of this isotope of lithium?

Which statements about potassium bromide are correct?

• It has a high melting point.

• It dissolves in water.

• It conducts electricity when solid.

Which use of graphite depends on the layers of carbon atoms being able to slide over each other?

• cutting tools

• electrodes

• jewellery

• lubricant

Which equations are balanced?

• 1. Fe2O3 + 3CO → 2Fe + 3CO2

• 2. ZnCO3 + 2HCl → ZnCl2 + CO2 + 2H2O

• 3. Mg(NO3)2 + NaOH → Mg(OH)2 + 2NaNO3

• 4. CaCO3 + H2SO4 → CaSO4 + H2O + CO2

Which two particles have the same electronic structure?

• C and O2–

• F– and Na

• K+ and S2–

• Mg and Na+