Topic
Q:
Part A
Particles of this mixture remain inside a semipermeable membrane, but pass through filters.
characteristic of a solution
characteristic of a colloid
characteristic of a suspension
Q:
\[ 2 \mathrm{Ca}_{(s)}+\mathrm{O}_{2(s)} \rightarrow \underbrace{2 \mathrm{CaO}_{(s)}} \Delta_{\mathrm{r}} \mathrm{H}=-1270 \mathrm{~kJ} \mathrm{~mol}^{-1} \]
Calculate the mass of calcium oxide formed when 2000 kJ of energy is released.
\( \mathrm{M}(\mathrm{CaO})=56.1 \mathrm{~g} \mathrm{~mol}^{-1} \)
Q:
A 35.0 mL sample of \( 8.0 \%(\mathrm{~m} / \mathrm{v}) \mathrm{NaOH} \) is diluted with water so that the final volume is 200.0 mL .
Express your answer using two significant figures.
Q:
15. The \( \Delta \mathrm{H} \) for the following reaction was determined to be -184 kJ . Use this information along with the
balunced chemical equation, molar mass, and conversion factors to answer the questions below.
Molar \( {\mathrm{Mass} \mathrm{Cl}_{2}=70.9 \mathrm{~g} \mathrm{Cl}_{2} / 1 \text { mol Cl}}_{2} \)
\( 1 \mathrm{kcal}=4.184 \mathrm{~kJ} \)
\( \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HCl}(\mathrm{g}) \)
a. Is the reaction endothermic or exothermic?
b. If 10.6 g of \( \mathrm{Cl}_{2} \) react, will heat be released or absorbed?
Q:
Kr
Check all that apply.
dispersion forces
dipole-dipole forces
hydrogen bonding
Q:
Determine if a homogeneous solution forms when each pair of substances is mixed.
Check all that apply.
\[ \mathrm{CCl}_{4} \text { and } \mathrm{H}_{2} \mathrm{O} \]
\( \mathrm{Br}_{2} \) and \( \mathrm{CCl}_{4} \)
\( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \) and \( \mathrm{H}_{2} \mathrm{O} \)
Q:
Are \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3} \) and \( \mathrm{H}_{2} \mathrm{O} \) miscible?
yes
no
Q:
Which of the following has the highest boiling point? Hint: They are all nonpolar.
\[ \mathrm{CH}_{4} \]
\( \mathrm{CH}_{3} \mathrm{CH}_{3} \)
\( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3} \)
\( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3} \)
Q:
How much heat is required to vaporize 33.8 g of water at \( 100^{\circ} \mathrm{C} \) ?
Express the heat in kilojoules to three significant figures.
Q:
Calculate the amount of heat required to vaporize 84.8 g of water at its boiling point.
Express the heat in kilojoules to three significant figures.
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