Cracking the SAT Chemistry Subject Test

INTERMOLECULAR FORCES At this point in our study of the states of matter, we will stop to look ...

negative charge around an F, O, or N in a hydrogen bond. Hydrogen bonds are stronger than any other ...

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As with hydrogen bonding, the positive and negative dipoles between different molecules attract each other. ...

higher boiling point than CH 4 (which just has London dispersion). Note that when ionic substances ch ...

Properties of Crystalline Solids Keep in mind that not all solids are network solids. There are actually four ...

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Do I Need to Know About Hydrates? Yes, but they’re nothing you can’t handle. A hydrate (or hydrated salt) ...

PHASE CHANGES We refer to the condition of being a solid, liquid, or gas as being in a particular state ...

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Above, we’ve shown the phase change diagram for some substance at some pressure. You might v ...

substance’s melting and boiling points. Reduced pressure makes it easier for solids to melt and ...

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In this diagram, each region—solid, liquid, and gas—represents the phase that will exist for substance ...

into the gaseous phase. This is called evaporation. If they’re in a closed system (such as a pot with a ...

partial pressure of atmospheric molecules As the substance gets warmer, the vapor pressure increases ...

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Besides intermolecular forces and temperature, molecular weight also affects vapor pressure. The heavier the ...

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Vapor pressure: • molecules of liquid escaping into gas phase although temperature of the liquid is below boi ...