Chemistry Quiz

Which change of state is accompanied by the removal of heat energy?

• solid to gas

• solid to liquid

• liquid to gas

• liquid to solid

Which of the following statements is correct?

• The mass of a proton is equal to the mass of an electron

• The size of the charge on a proton is equal to the size of the charge on a neutron

• The mass of a neutron is equal to the mass of an electron

• The size of the charge on a proton is equal to the size of the charge on an electron

The atoms of elements in Group II of the periodic table have the same:

• mass number

• number of protons

• number of occupied electron shells which contain electrons

• number of electrons in the outermost electron shell

Which of the following would not conduct an electric current?

• Cu(s)

• Cu(I)

• NaCl(aq)

• NaCl(s)

Which formula represents a compound that is formed primarily by the sharing of electrons?

• MgCl2

• Fe2O3

• CCl4

• NaBr

The pair of elements with the most similar chemical properties are:

• Mg and Si

• Mg and Ca

• Na and Al

• Cl and Ar

Which trends appear as the elements in Period 3 are considered from left to right?

• Oxidising strength increases, metallic character decreases

• Oxidising strength decreases, metallic character decreases

• Oxidising strength increases, metallic character increases

• Oxidising strength decreases, metallic character increases

Which of the following conditions will not increase the rate of the following chemical reaction? NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

• Increase the temperature

• Increase the concentration of the hydrochloric acid

• Increase the pressure

• Add a catalyst

When sulfuric acid reacts with a sodium hydroxide solution, an acidic salt is formed. The acidic salt is:

• sodium sulfate

• sodium sulfide

• sodium hydrogensulfate

• sodium sulfite

Magnesium can displace copper from copper(II) oxide according to the following equation: CuO(s) + Mg(s) → MgO(s) + Cu(s). In this reaction:

• Mg gains electrons and is oxidised

• Mg loses electrons and is oxidised

• Mg gains electrons and is reduced

• Mg loses electrons and is reduced