Exam 1
Exam 2
Exam 3 + CH10
Equations
Miscillaneous
100
How many meters are in 3557 millimeters?
3.557 meters
100
Balance the following equation: ____FeBr3 + ____H2SO4 → ____Fe2(SO4)3 + ____HBr
2 FeBr3 + 3 H2SO4 → 1 Fe2(SO4)3 + 6 HBr
100
How many moles of NaOH are in a sample of 74 g?
1.85 mol
100
What was the name of the scientist and the name of the experiment where the nucleus was discovered?
Rutherford's gold foil experiment
100
DOUBLE JEOPARDY: When do ideal gases behave ideally? (hint: at what temp/pressure)
At high temperatures and low pressure!
200
How many sig figs should be in the final answer for the following equation? (5.5832) / (2.125 + 0.53)
Sig figs: 3 Answer: 2.10
200
Which of the following contains an sp2-sp2 bond? A. CH4 B. C2H4 C. C2H2 D. C2H6
B
200
Given the following equation: Mn(s) + 2 HCl(aq) --> MnCl2(aq) + H2(g) ΔH = 221 kJ Is this equation endothermic or exothermic? Is there a net number of bonds being made or broken?
Endothermic Bonds are being broken
200
Define electronegativity (as best as you can)! What's the general trend of electronegativity on the periodic table?
Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. It increases as you move up and across (to the right) of the table. Fluorine is the most EN element.
200
Name 2 nonelectrolytes, 2 weak electrolytes, and 2 strong electrolytes.
Nonelectrolytes:CH3OH, C2H5OH, H2O, most compounds of carbon Weak Electrolytes:CH3CO2H, HF, HCN, NH3 Strong Electrolytes: HCl, HBr, HI, HClO4, HNO3, H2SO4, KBr, NaCl, NaOH, KOH, other ionic compounds
300
An atom of isotope sulfur-31 consists of how many protons, neutrons, and electrons?
P= 16 N= 15 E=16
300
Which of the following is a polar MOLECULE? (Hint: look at dipoles/net dipole...) A. CH4 B. N2 C. NH3 D. CO2
C. In all others, the dipole moments cancel out!
300
An organic compound is 38.66% C, 9.73% H by mass with the remainder being sulfur. What's the empirical formula?
C2H6S
300
Explain the difference between polar covalent, non polar covalent, and ionic!
Ionic=a metal and a nonmetal with full charges. They become ions when dissociated. Electrons are fully transferred Covalent=2 nonmetals with partial charges. Electrons are shared (polar=appreciable difference in electronegativity, nonpolar=small/no difference in electronegativity)
300
What is the sign of ΔV when work is being done ON the system by the surroundings?
Negative
400
DOUBLE JEOPARDY: Which of the following types of electromagnetic radiation has the lowest frequency? Ultraviolet, Gamma rays, microwaves, or visible?
Microwaves Remember: GXUVIMR ----------> smaller frequency
400
What are the 4 intermolecular forces we learned about? Rank them from weakest to strongest! What is the boiling point trend?
Weakest to strongest: LDF, Dipole-Dipole, Hydrogen Bonding, Ion-Dipole The stronger the force, the higher the boiling point
400
Complete the following reaction: 2AgNO3(aq) + BaCl2(aq) --> ? What kind of reaction is this? (Redox, Neutralization or Precipitation)
2AgNO3(aq) + BaCl2(aq) --> 2AgCl(s) + Ba(NO3)2(aq) Precipitation!
400
What is the difference between: Heat Capacity Molar Heat Capacity Specific Heat capacity
Heat Cap: amount of heat required to raise temp of a substance a given amount Molar Heat Cap: amount of heat necessary to raise the temp of 1 mol of a substance by 1 degree Celsius Specific Heat Cap: amount of heat necessary to raise the temp of 1 g of a substance by 1 degree Celsius
400
In the following reaction, the oxidation number of Fe changes from ____ to ____. Fe2O3 + 3CO = 2Fe + 3CO2 Is Fe being oxidized or reduced?
+3 --> 0 Reduction!
500
Which ground state electron configuration would correspond to the atom with the largest diameter? A. ns2 B. ns2sp1 C. ns2np3 D. ns2ns6
A
500
Given an H2O molecule: What is the electron geometry? What is the molecular geometry? What is the bond angle around the central atom?
Tetrahedral Bent 104.5 degrees
500
What is the volume of 2.56 moles of gas at 0.634 atm and 65 °C?
PV = nRT V = 112L
500
In each of the following cases, which gas will effuse at the greater rate? 1. NO2 at STP or SO2 at STP 2. Ne at 25 degrees Celcius and 1 atm or Ne at 100 degrees Celsius and 1 atm
NO2 at STP AND Ne at 100 degrees Celsius and 1 atm
500
Given the following equation: 3AgNO3 + FeCl3 --> 3AgCl + Fe(NO3)3 Which reactant is the limiting reactant?
AgNO3
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