Chapter 09 S-P of substances (Ch_Exercise+)

Which of the following statements concerning iodine is/are correct?

(1) It consists of diatomic molecules.

(2) It has a low boiling point because iodine atoms are held together by covalent bond.

(3) It has a giant covalent structure.

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

Which of the following statements concerning the substances with a giant covalent structure are correct?

(1) They have high melting points.

(2) They can conduct electricity when molten.

(3) They are insoluble in water but soluble in non-aqueous solvents.

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

Which of the following substances has a giant ionic structure?

• SiO₂

• SO₂

• HgO

• NO

The diagram below shows the structure of an

ionic compound formed from the reaction

between metal M (black spot) and non-metal X.

The formula of this compound should be

• M₂X₃

• MX

• MX₂

• M₂X

X has a melting point of 2566°C. It can conduct

electricity when molten but not in the solid state. X

• is insoluble in water.

• is malleable.

• is probably an ionic compound.

• consists of separate molecules.

Caesium (Cs) is in the same group as sodium in the Periodic Table. Which of the following predictions of the properties of caesium is INCORRECT?

• The formula of its chloride is CsCl.

• It reacts vigorously with water.

• Its chloride is soluble in water.

• It decomposes when conducting electricity.

Which of the following statements concerning iodine is correct?

• Iodine exists as discrete molecules.

• Iodine lattice has a giant covalent structure.

• Iodine molecules are held together by covalent bonds.

• Iodine is a liquid at room temperature and pressure.

Which of the following types of bonds are present in ammonium chloride?

(1) Ionic bond

(2) Covalent bond

(3) Dative covalent bond

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following substances CANNOT conduct electricity?

• Pt(s)

• PbBr₂(l)

• C(graphite)

• CH₃CH₂OH(l)

Silicon and carbon react to form silicon carbide. The crystal structure of silicon carbide is similar to that of diamond. Silicon carbide is very hard because

• it has a high melting point.

• silicon atoms and carbon atoms form triple bonds.

• it has a giant network structure with strong covalent bonds.

• both silicon and carbon atoms have four outermost shell electrons.

Tags

NGSS.HS-PS1-1