Cracking the SAT Chemistry Subject Test

ENERGY AND PHASE CHANGES As we saw from the phase change diagram, a substance must absorb heat ...

DRILL 2 Question Type A Questions 4–7 refer to the following. (A) N 2 O 4 (g) + heat → 2NO 2 (g) (B) I 2 (s) ...

104. ...

Question Type C A 10-gram sample of which substance is held together by hydrogen bonding? (A) H 2 (B) NH 3 ...

Summary The ideal gas law is PV = nRT. The assumptions underlying this equation are that gas molecules do not ...

Generally, increasing pressure moves a substance toward the solid phase. H 2 O is an exception because ice i ...

Chapter 9 Solutions A solution is a mixture of a solute (the substance of which there is less) and a ...

MEASURING CONCENTRATIONS The most commonly used unit for concentration is molarity. Its symbol is M. Molari ...

It’s important to realize the denominator is not the mass of the solvent only; it represents the mass of the t ...

Dissociation and Electrolytes When an ionic substance (NaCl, KCl, CaBr 2 , or CuSO 4 ) dissolves in wate ...

The dissociation of ionic compounds always creates an equal number of positive and negative charges in solutio ...

BOILING POINT ELEVATION AND FREEZING POINT DEPRESSION When a solute is dissolved in a liquid solvent, the ...

m = molality = i = whole number equaling the number of particles a substance dissolves into Again, ...

PRECIPITATION REACTIONS Okay, so now you know that when ionic solids are dissolved in water, t ...

DRILL 1 Question Type A Questions 1–3 refer to the following. (A) Nitrogen dioxide, NO 2 (g) (B) Iodine, I 2 ( ...

102. ...

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Question Type C Which of the following will most likely increase the solubility of NaCl in water? (A) ...

Summary Molarity is a measure of concentration and is given by molarity = M = Molality is another ...

of solute particles. For different solutions with the same molality, the boiling point elevation an ...