What is true of all chemical reactions?
Atoms rearrange themselves to form new molecules.
In the following reaction, what's the molar ratio between oxygen and carbon dioxide?
4C2H3Br3 + 11O2 → 8CO2 + 6H2O + 6Br2
11 mol O2 /8 mol CO2
How many valence electrons do the following atoms have:
Carbon
Potassium
Sulfur
Carbon 4
Potassium 1
Sulfur 6
What is radioactivity?
(Your answer must include the two most important points!)
A spontaneous change of the nucleus that releases energy.
What was the plum-pudding model of the atom? What was the experiment that disproved this model?
The plum-pudding model stated that atoms have an evenly distributed mass rather than a dense mass in the center (nucleus). The gold foil experiment shows that particles bounce of the atom, thus proving there is a dense center.
What is an acid?
What is the difference between a strong acid and a weak acid?
An acid contains a H+ that can easily come apart in water.
Strong acids come apart completely in water, weak acids do not.
If 1 mol of each reactant is allowed to react in the following manner, which would be the limiting reactant?
2SO2(g) + O2 -> 2SO3(g)
SO2
More of it is consumed, so it will run out first.
How many orbits does a calcium atom have?
Four orbits!
It's in the fourth period
It can take an electron off of water's atoms and cause it to be super reactive, which is harmful to the body!
Which of the following points about Dalton’s Atomic theory is false?
Atoms can never change into atoms of other elements.
Nuclear chemistry shows us that this can happen!
What arethe chemical formulae for the following compounds?
Calcium oxide
Iron(III) fluoride
Nickel(II) nitride
CaO
FeF3
Ni3N2
How many mol of H2O are produced when 20.0 mol of O2 react according to the following reaction:
4C2H3Br3 + 11O2 → 8CO2 + 6H2O + 6Br2
10.9 mol
What is the variable for wavelength? How does the wavelength of a photon change with:
increasing frequency
increasing energy
λ
In both cases, wavelength decreases!
Write the equation for the following particle undergoing beta decay:
23993 Np
23993Np -> 0-1e + 23994Pu
A molecule was found to have an empirical formula of NH3. Which of the following cannot be the molar mass of this compound?
93.7 g/mol
Balance the following reaction and determine what type of reaction it is:
__C6H6(aq) + __O2(g) -> __CO2(g) + __H2O(g)
Reaction Type: ______________________________
2C6H6(aq) + 15O2(g) -> 12CO2(g) + 6H2O(g)
Combustion
A patient has 7.35 mg of zinc in her 6.34 L of blood. What is this patient's blood-zinc levels in mM?
0.0177 mM
Draw the Lewis structure of AsO2-.
A radioactive 300.0-g sample of zirconium has a half-life of 13.5 minutes. How much of this sample is left after 30.0 minutes?
Nt = N0e-kt
64.3 g
How many molecules are in 174.0 g of the compound Fe2Cl3?
4.806 x 1023
Write out the following neutralization reaction:
Hydrobromic acid reacts with magnesium hydroxide
2HBr(aq) + Mg(OH)2(s) -> 2H2O(l) + MgBr2(aq)
What mass of sulfur dioxide was consumed if 12.4 g of sulfur trioxide forms in the following reaction with excess oxygen?
2SO2(g) + O2 -> 2SO3(g)
64.058 g/mol 31.998 g/mol 80.057 g/mol
9.92 g
Order these atoms by increasing atomic radii:
Cl- Ar K+
Opposite!
K+ Ar Cl-
(More electrons means more repulsion, and thus larger)
How much energy is released per mole in the following fusion reaction:
21H + 31H -> 42He + 11n
21H = 2.01410 amu
31H = 3.01605 amu
42He = 4.00260
11n = 1.00866
5.03015 amu -> 5.01126
Change of 0.01889
1.71 x 1012 J
500.0 g of zinc is heated by 3.40 kJ. If the sample starts at 4.00°C, what is the final temperature of the sample? Theat specific heat of zinc is 0.387 J/g*K
21.57OC