Exam 1
How many protons and electrons does a sulfide ion, S2- have?
16 protons, 18 electrons
calculate the molarity of 8.75 grams of sodium chloride in 40.0 mL of solution
3.74M
1 mol of oxygen gas has a volume of 22.4L at STP, what is the volume of 1 mole of nitrogen gas at STP?
22.4L
which element has the highest electronegativity? the lowest?
highest: Fluorine (F)
lowest: Francium (Fr)
The origin of the meter came from what country?
France
how many molecules are there in 0.11g of formaldehyde, CH2O?
2.2 x 1021 molecules
What is the total and net ionic equations for the reaction between AgNO3(aq) and NaCl(aq)
total: Ag(aq) + NO3(aq) + Na(aq) + Cl(aq) -> AgCl(s) + Na(aq) + NO3(aq)
net: Ag(aq) + Cl(aq) -> AgCl(s)
When 1.57g of HgO(s) (MW 216.39 g/mol) is decomposed to form Hg(l) and O2(g) and the heat of the reaction is -7.75 kJ/mol, how much energy (in KJ) is released?
-2.81E-2 KJ
What is the full and shorthand electron configuration of Selenium?
full: 1s22s22p63s23p64s23d104p4
shorthand: [Ar]4s23d104p4
What is the only letter that does not appear on the periodic table?
J
what is the formula for calcium phosphate?
Ca3(PO4)2
What are the oxidation numbers for each? Which is the reducing reagent?
2Au+(aq) + Cu(s) -> 2Au(s) + Cu2+(aq)
Cu(s)
what pressure is required to compress 196.0 liters of air at 1.00 atmosphere into a cylinder whose volume is 50.0 liters?
3.92 atm
what is the electronic geometry of Cl in chlorite?
tetrahedral
which element's name comes from the Greek word for "green"?
Chlorine
What is the correct name for PbCl4?
lead(IV) chloride
What is the chemical formula of the salt produced by the neutralization of hydrochloric acid with calcium hydroxide?
HINT: write out the balanced reaction
CaCl2
Methane undergoes combustion in oxygen to produce carbon dioxide gas and liquid water. The standard heat of combustion of methane (CH4) is –1527.8 kJ/mol. Given that dH°f[CO2(g)] = –393.5 kJ/mol and dH°f[H2O(l)] = –285.8 kJ/mol, what is the standard enthalpy of formation of methane?
562.7 KJ/mol
draw the lewis structure of CH3OH, is it polar or non-polar?
polar
What everyday item uses the oxidation of zinc to generate electricity?
A battery
You have 0.500g of the following elements: He, Ne, Ar, Kr, Fe. Which sample contains the largest number of atoms? show your work.
He
What is the theoretical yield of aluminum that can be produced by the reaction of 60.0g of aluminum oxide with excess of carbon according to the following chemical reaction?
Al2O3 + C --> Al + CO
31.7
During discharge of a lead-acid storage battery, the following chemical reaction takes place: Pb + PbO2 + 2H2SO4 ---> 2PbSO4 + 2H2O. Calculate heat of reaction using:
1. Pb + PbO2 + 2SO3 ---> 2PbSO4 , ΔH° = −775 kJ
2. SO3 + H2O ---> H2SO4 , ΔH° = −113 kJ
-549 kJ
how many resonance structures are there for phosphate? draw them all
4
A helium balloon is left in a cold car overnight. What gas law explains why it shrinks?
Charles' Law V1/T1 = V2/T2