Asian

Why is water denser in the liquid state than in the solid state. I know it has something to do with hydrogen bonding and the particles sliding past each other. Can someone please explain.

it is the other way around because if you lost an electron, then there would be "x" amount of protons more than the electorns, therefor making it postive

if the chemcial reaction is CaCO3----> CaO + CO2, and if 40.0g of caco3 is decomposed, and 22.4 g of CaO is produced. if the question asks "where did the rest of the mass go", is it that it was burned off since its decomp in the form of CO2?

We just startedt this topic in class and i dont understand it. I know this is a very basic problem but I need some help on where to start. If the partial pressures of oxygen and carbon dioxide are 565mm Hg and 225Hg respectivley, what would be the total pressure of the system?

if its a tertiarty acid then this applys. it ussually involves a polyatomic ion. if the polyatomic ion ends in "ate" the acid ends with "ic". if the polyatomic ion ends with an "ite" then the acid ends with "ous"

if the energy level equaled n=4. and the question how many electrons could this sublevel hold. would u use 2n^2. so therefore it would be 32 electrons?

Will someone please help me in determinig the polarity of a molecule

What is Electron Affinity and what are the trends on the periodic table?

and 6.023*10^23 u use that if u want to convert to molecules, particles ,etc.

the molar mass is the total wieght of the molecule. u then need to divide by that in order to convert to mols of w/e substance u are looking to find

u need the molar mass to convert to mols, and use dimensioanl analysis

okay thanks for the help. i have a midterm tomorrow thats why im asking these questions. one more thing. when determining if a covalent bond is polar or not u look at the electronegativities. in order for it to be polar there has to be a great difference in electronegativity, but how much does that quanitiy have to be essentially.

im fairly confused with my notes. they say that a principal quantum number is equal to n, and they have integral values f 1-7 (indicating which electron orbital they are in). They then say that the quantum number can have integral values of (n-1), and says that 0=s sublevel, 1=p sublevel, 2=dsublevel, and 3=f sublevel. so wat if the prinsipal quantum number was 6. 6-1=5. i dont understand which sublevel that would correspond to. -thanks for any help.

3 Questions: 1. Im confused on how the principle quantum numbers are related to the orientation of the sublevels, and energy levels. 2. I also dont understand why an s sublevel can only have 1 orbital, a p sublevel can only have 3 orbitals, a d sublevel can only have 5 orbitals, etc. 3. How can we tell wther or not an electron is in the ground or excited state based on electron configs.

why is y=-f(x) a reflection of the graph y=f(x) accross the x-axis?

if its a double replacement a precipitate would be formed. u need to use the solutbility rules in order to tell you which one is the solid.

anyone know any very very[uvery difficult stoichy problems>

how do you find the excess amount of a substance in a stoichiometry problem?

How many grams of zinc chloride solution are required to completely react with 15.0 grams of lithium? the zinc chloride solution is 8.00% zinc chloride by mass? Can somenoe help me figure out where to begin?

so then the rest is factor by grouping........ thanks, i just wanted to check my answer because it wasnt in the back of the book and i have a test tomorrow.

How would you factor: A^3 + B^3 + A^2 - B^2

how did u know wether or not the first question was a limiting reactant problem???

typically when it says excess, does that involve limiting reactant??/

I just had this problem given to me, we just started it and im kind of lost: How many moles of oxygen are consumbed when 96.7 moles of hydrogen sulfide gas are burned producing sulfur dioxide and wator vapor in the process? I got 145 mols of o2, but im not sure

What is the best strategy to take towards a Geometry-Related Proof?