<p>Can somebody help me on my study guide for Chemistry? Dont laugh at me, we don't learn anything in there and we don't even have AP Chemistry. Thanks for all the help I can get...</p>
<p>Here it goes...</p>
<p>1) Why does pressure increase if more gas is added to the container?</p>
<p>2) Increasing volume causes pressure to decrease because....</p>
<p>3) How many calories are needed to raise the temp. of 10 g of water from 25 degrees C. to 35 degrees C.</p>
<p>4) Heat of vaporization of water - in comparison to other liquids - higher, lower, the same?</p>
<p>5) What causes Brownian motion in colloidal suspensions?</p>
<p>6) What is the solubility of silver nitrate if only 11.1 g can dissolve in 5.0 g of water at 20 degrees C?</p>
<p>7) Which of the following operations usually makes a substance dissolbe faster in a solvent?</p>
<p>8) When a gas is compressed, what happens to the temperature?</p>
<p>9) Increasing the temperature of a solution will generally.....
-increase the rate at which a solute dissolves
- increase the amount of solute that dissolves....</p>
<p>thanks, ive dont the other 31 questions, i seem to cant find these.. thanks</p>
<p>do you want in terms of the laws, or in terms of the concepts? for example, number one you can either back it up with the ideal gas law equation or with the reason that more molecules means more mass pushing on the sides of the container.</p>
<p>1) PV = nRT, increasin n and keeping volume and temp. constant must cause increase in pressure.
more molecules means it's more crowded and there's more pushing on everything, this pushing is the pressure.</p>
<p>2) PV = nRT, increasing V and keeping n and T constant must decrease P.
bigger space means it's less crowded for the molecules. they don't push on each other so often. therefore less pressure</p>
<p>3) 1 cal is the amount of heat needed to raise 1 g of water by 1 degree C.
(1 cal/g C)(10g)(10 C) = 100 cal</p>
<p>4) higher, because water has hydrogen bonding, which makes the molecules less willing to separate from each other and evaporate</p>
<p>5)not sure. i'm not looking anything up</p>
<p>6) i'm not sure, but it might be the #moles/kg water</p>
<p>7)i don't know what your following operations are, but i would assume raising the temperature</p>
<p>8) again, PV=nRT, decrease V while keeping P and n constant, and T decreases too.
less volume but equal pressure means the molecules have to crowd around just as much, but with less area to do so, so they can't have as much energy, therefore temp. decreases</p>
<p>9) i think that both are correct, but don't quote me on that one</p>
<p>i haven't taken chem in a little while, but that's the best i can do.</p>
<ol>
<li>Each gas particle has less space to occupy therefore increasing the pressure.</li>
<li>Each gas particle has more space to occupy therefore lowering the pressure.</li>
<li>100 cal</li>
<li>Relatively high.</li>
<li>Osmosis? Diffusion?</li>
<li>Do you mean molarity/molality?</li>
<li>Stir, increase temp...ect.</li>
<li>Inversely related so temperature goes down.</li>
<li>Both?, I know #1 is for a fact.</li>
</ol>
<p>for 6, convert the mass of silver nitrate (11.1g) to moles.</p>
<p>convert the 5g of water to mL --> 5mL of water, then convert to Liters.</p>
<p>divide the moles of silver nitrate by the liters of water, that's your answer.</p>
<p>for #9 the second answer is right...... so I guess it's both.</p>
<p>not sure about 5. everyone else answered the other ones</p>