Chemistry Quiz - Cambridge IGCSE

Which statements about clean, dry air are correct?

• It is a mixture of elements only.

• It is a mixture of elements and compounds.

• It contains only non-metals.

What is the nucleon number of this atom?

• 6

• 7

• 12

• 13

Which statements about element X are correct?

• X has an atomic number of 6.

• X has a nucleon number of 11.

• X is in Group II of the Periodic Table.

• X is in the second period of the Periodic Table.

Which structure does silicon (IV) oxide most closely resemble?

• carbon dioxide

• diamond

• graphite

• sodium chloride

Q and R are elements in the same period of the Periodic Table. Q has 7 electrons in its outer shell and R has 2 electrons in its outer shell. Which statement about Q and R is correct?

• Q is a metal and R is a non-metal.

• Q and R have different numbers of electron shells.

• R is found to the right of Q in the Periodic Table.

• The proton number of R is less than the proton number of Q.

Substance M is a solid at 30 ºC. The substance is heated to 80 ºC and its temperature measured as it cools down to room temperature. The cooling curve is shown. Between which times is substance M freezing?

• P to Q

• Q to R

• R to S

• S to T

Which gas has the fastest rate of diffusion?

• Ar

• C2H6

• HCl

• H2S

There are two stable isotopes of bromine. The mass number of isotope 1 is 79. The mass number of isotope 2 is 81. Which statement is correct?

• The isotopes have the same number of neutrons.

• The isotopes have different chemical properties.

• The isotopes have different numbers of protons.

• The isotopes have the same number of outer electrons.

Which statement about ions and ionic bonds is correct?

• Bromine atoms form negatively charged bromide ions.

• Ionic bonds form between elements in Group VII of the Periodic Table.

• Positive ions are formed when atoms lose protons.

• Potassium iodide contains negatively charged potassium ions.

Part of the Periodic Table is shown. Which type of chemical bonding is present in the oxide of F and in the oxide of G?