Please answer all questions.
Which of the following best describes the bonding between atoms in metals.
|A)||the transfer of electrons from one atom to another, producing charges which then interact with each other|
|B)||by sharing pairs of electrons with adjacent atoms|
|C)||by fusing the atomic nuclei to produce a continuous malleable array|
|D)||the valence electrons of a given metal atom are delocalized over all of the atoms in the piece of metal|
|E)||the fusion of the protons, neutrons and electrons to form a hard solid mass|
Butter, like glass, melts over a range of temperatures, rather than with a sharp melting point. Butter might be classified as a/an:
The boiling point of a substance is most strongly influenced by:
|A)||the molecular weight of a substance|
|B)||the specific heat of the substance|
|C)||the melting point|
|D)||the strength/weakness of the intermolecular forces|
|E)||the amount of the substance involved|
Viscosity of liquids typically increases when which of the following is considered, except:
|A)||the temperature is increased|
|B)||compounds with ionic bonds are involved|
|C)||substances that can hydrogen bond are used|
|D)||longer molecules are used|
|E)||compounds with greater molecular weights are used|
All of the following are intermolecular forces except:
|D)||van der Waals forces|
Which one of the following is not an example of a covalent network solid?
|E)||none of the above|
Calculate the amount of heat necessary to raise the temperature of 8.5 kg of water from 12.5°C to 84°C
|A)||2.99 x 103 kJ|
|C)||2.54 x 103 kJ|
|D)||2.54 x 106 kJ|
Which of the following molecules would have hydrogen bonding?
The relatively high boiling point of water can be attributed to which type of bonding?
|C)||van der Waals|
KCl is considered what kind of solid?
A bar of copper is considered what kind of solid?
Amorphous solids are characterized by:
|A)||Having a definite melting point|
|B)||Softer as temperature is raised|
NaF is considered what kind of solid?
The term that describes when the rate of evaporation equals the rate of condensation is
Which of the following is not considered a phase change?
|A)||Boiling liquid CH4|
|B)||Melting solid CH4|
Solid CO2 becomes a gas at room temperature. This process is called:
|E)||none of the above|
Which of the following statements is NOT true?
|A)||When water freezes, the volume increases and thus the density decreases.|
|B)||When water freezes, the volume decreases and thus the density increases.|
|C)||When water freezes, the volume decreases and thus the density decreases.|
|D)||When water freezes, the volume increases and thus the density increases.|
Calculate the energy required to turn 100. g of water at 50.°C into steam at 100.°C.