<p>Ok here goes one for chemistry, you all know the rules, answer the previous question, then ask a new one. it doesnt have to be a specific question, it can be pretty generic too</p>
<p>have fun
:)</p>
<p>ill start....</p>
<p>What is the number of electrons in an atom of scandium that have an l quantum number of 1?</p>
<p>yay games. >>
12! (it's kind of ridiculous how long it took me to find Sc on the periodic table :x)</p>
<p>The melting point of MgO is (higher/lower) than that of NaF because...</p>
<p>Higher, Mg is +2 and O is -2 so they have a stronger bond.</p>
<p>Someone else ask a question, I'm too lazy.</p>
<p>MgO has a higher melting point because it has a smaller atomic radius due to more protons in the nucleus causing a greater proton-electron attraction. According to Coulumb's Law, when the atomic radius is smaller for atoms, the bonds are closer together making them stronger and harder to break. Therefore MgO has a higher MP. </p>
<p>New Question : Explain why the first ionization for Mg is greater than the first ionization for Ca.</p>
<p>xplosnsnthesky: how did you figure out that it was 12?</p>
<p>melting pt of MgO is lower because it has stronger bonding force? (sorry I'm horrible at chem)</p>
<p>what is hund's rule?</p>
<p>nvm....lol</p>
<p>l quantum number refers to the subshell (s, p, d, f); 1 = p, and since Sc is the first transition metal it has the 2p electrons (6) and the 3p electrons (6) = 12.</p>
<p>okkkk. hund's rule states that electrons are added to the orbitals half filling them all before any pairing occurs.</p>
<p>To determine the molar mass of a solid monoprotic acid, a student titrated a weighed sample of the acid with standardized aqueous NaOH. Would failure to rinse all acid from the weighing paper into the titration vessel would result in a molar mass that is too small or too large?</p>
<ol>
<li><p>Mg has a greater first ionization energy because its' valence electrons are in a shell closer to the nucleus, so the nucleus has a greater attractive force on the electrons, making them harder to remove.</p></li>
<li><p>Hund's rule says that when electrons are added to a subshell, they will fill an empty orbital first.</p></li>
</ol>
<p>Too large, because molar mass = g/mol, and if there was less acid, the mols would be less.</p>
<p>A compound is burned and the flame is yellow. This compound could contain:
a)Cu
b)Na
c)Fe
d)Ba
e)Zn</p>
<p>no clue?
anyone?</p>
<p>B) Na </p>
<p>10 char</p>
<p>how do you figure that out?</p>
<p>you take the molar mass, divide by Faraday's constant and then apply Bizet's formula to get the frequency of the light in kilhohertz.</p>
<p>jk, you just know it.</p>
<p>lol i was going to say....woahhh
ha :)</p>
<p>ok then, new question:</p>
<p>this isnt like a specific question, but like, does anyone know any phrases that might help? for example, i know
LEO the lion goes GER
which means Loses Electrons- Oxidation, Gains Electron- Reduction
RICE= Reaction, Initial, Change, Equilibrium</p>
<p>anyone want to add on?</p>
<p>I actually find these to be helpful in terms of electrochemistry: AN OX, RED CAT. Then you just have to figure out that electrons are lost in oxidation, and electrons are gained in reduction. Helps me figure out what happens where.</p>
<p>Question...</p>
<p>Which has the highest melting point?
A) S8
B) I2
C) SiO2
D) HCl
E) MgO</p>
<p>Silicon dioxide is network covalent, so it's like to have the highest melting point.</p>
<p>What are the conditions in which a real gas will behave ideal(ly)?</p>
<p>SiO2 as it is a covalent network solid. I am too lazy to write a question...</p>
<p>High temperatures and low pressure, right?</p>
<p>wait...i thought ionic solids had a higher mp than network covalent....why isn't it MgO?</p>
<p>nope i m pretty sure covalent networking > ionics.</p>