91影视

Explain why most metals bend when struck but most ionic solids shatter.

How does the strength of a liquid鈥檚 intermolecular forces affect its viscosity?

Explain why water has a higher surface tension than benzene, whose molecules are nonpolar.

Explain why ice floats in water but solid benzene sinks in liquid benzene. Which behavior is more 鈥渘ormal鈥�?

Given edge lengths and face angles, predict the shape of each of the following crystals. $$ \begin{aligned} \text { a. } a &=3 \mathrm{nm}, b=3 \mathrm{nm}, c=3 \mathrm{nm} ; \alpha=90^{\circ}, \beta^{\circ}=90 \\ \gamma &=90^{\circ} \\\ \text { b. } a &=4 \mathrm{nm}, b=3 \mathrm{nm}, c=5 \mathrm{nm} ; \alpha=90^{\circ}, \beta^{\circ}=100 \\ \gamma &=90^{\circ} \\ \text { c. } a &=3 \mathrm{nm}, b=3 \mathrm{nm}, c=5 \mathrm{nm} ; \alpha=90^{\circ}, \beta^{\circ}=90 \\ \gamma &=90^{\circ} \\ \mathrm{d} &=3 \mathrm{nm}, b=3 \mathrm{nm}, c=5 \mathrm{nm} ; \alpha=90^{\circ}, \beta^{\circ}=90 \\ \gamma &=120^{\circ} \end{aligned} $$

How does sublimation differ from deposition?

Explain the relationships among vapor pressure, atmospheric pressure, and boiling point

Explain why dew forms on cool mornings.

Snow Why does a pile of snow slowly shrink even on days when the temperature never rises above the freezing point of water?

Why does it take more energy to boil 10 g of liquid water than to melt an equivalent mass of ice?