Use the following answers for questions 8 - 9.(a) a network solid with covalent bonding(b) a molecular solid with zero dipole moment(c) a molecular solid with hydrogen bonding(d) an ionic solid(e) a metallic solid

Use the following answers for questions 1 - 2. (1984 - #8 & 9)

(A) A network solid with covalent bonding

(B) A molecular solid with zero dipole moment

(C) A molecular solid with hydrogen bonding

(D) An ionic solid

(E) A metallic solid

1. Solid ethyl alcohol, C2H5OH (C)

2. Silicon dioxide, SiO2 (A)

Use these answers for questions 3-6 (1989 #11 – 14)

(A) hydrogen bonding (B) hybridization (C) ionic bonding

(D) resonance (E) van der Waals forces (London dispersion forces)

3. Is used to explain why iodine molecules are held together in the solid state (E)

4. Is used to explain why the boiling point of HF is greater than the boiling point of HBr (A)

5. Is used to explain the fact that the four bonds in methane are equivalent (B)

6. Is used to explain the fact that the carbon-to-carbon bonds in benzene, C6H6, are identical (D)

Use the following diagram for questions 7-8

(1989 - #49&51)

7. The normal boiling point of the substance

represented by the phase diagram above is

(A) -15 °C (B) -10 °C

(C) 140 °C (D) greater than 140 °C

(E) not determinable from the diagram

8. For the substance represented in the diagram,

which of the phases is most dense and which is

least dense at - 15 °C.

Most Dense Least Dense

(A) Solid Gas

(B) Solid Liquid

(C) Liquid Solid

(D) Liquid Gas

(E) The diagram gives no information

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

hope it

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).