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What is the mole ratio for oxygen: potassium chloride?
2 KClO3 --> 2 KCl + 3 O2
3:2
What is a precipitate?
A solid formed in a chemical reaction between two aqueous solutions.
If a photon has a wavelength of ~400 nm, what color is the light that we see?
purple
Give an example of a decomposition reaction (it is ok if it does not in fact exist as long as the process is correct)
AB--> A+B
What is the orbital that comes after 3p?
4s
Consider the following reaction:
Na2CO3 + 2HBr --> 2NaBr + H2O + CO2
If you start with 6 moles of hydrobromic acid, how many moles of water are produced?
3 mol H2O
Identify the precipitate in the following reaction:
3K2S + 2Al(NO3)3--> 1Al2S3 + 6KNO3
Al2S3 is insoluble
Which has higher energy associated: a red wave of light or a blue wave of light?
blue
Balance the following reaction:
___AsCl3+ ___H2S --> ___As2S3 + ___HCl
2,3,1,6
How many electrons fit into the f suborbital?
14
Consider the following reaction:
2HCN +CuSO4 --> Cu(CN)2 +H2SO4
If you start with 1.87 g of HCN, how many mol of Cu(CN)2 will be produced?
0.035 mol Cu(CN)2
Identify the states of matter for each of the following:
H2PO4 + NaOH --> H2O + Na3PO4
aq, aq, l, aq
What is Planck's constant? (don't forget units)
6.626 x 10-34 Js
Write out and balance the reaction:
BN + F2 -->
2BN + 3F2--> 2BF3 + N2
Draw the box diagram for iron.
Pretty picture :)
Zinc reacts with gold (II) nitrite. If you start with 47.35 grams of zinc and an excess of gold nitrite, how many grams of gold are produced?
142.65 g Au
K2S + ZnCl2-->
Determine the products, balance and identify the precipitate.
K2S (aq) + ZnCl2 (aq) -->2 KCl (aq) + ZnS (s)
Precipitate: ZnS
What is the frequency of a light wave with a wavelength of 650 nm?
4.61 x 1014 Hz or 1/s
Write out and balance the reaction for the combustion of C15H30.
2 C15H30 + 45 O2 --> 30 CO2 + 30 H2O
What is the full electron configuration for niobium?
1s22s22p63s23p64s23d104p65s24d3
2Mg +O2 --> 2MgO
What is the limiting reactant if 2.2 g of Mg is reacted with 4.5 L of oxygen at STP?
Mg
Write out and balance the reaction, determine the molar mass of the precipitate.
sodium sulfate reacts with barium nitrate
Na2SO4 + Ba(NO3)2 --> BaSO4 (s) + 2NaNO3
233.386 g/mol
What is the energy of a photon if it has a frequency of 9.2 x 1015 Hz?
~6.1 x 10-18 J
Write out and balance the synthesis reaction of sulfur dioxide from oxygen gas and sulfur gas.
8 O2+ 1 S8 --> 8 SO2
What is the noble gas configuration for bismuth?
[Xe] 6s24f145d106p3