Periodic Table and States of Matter
This element has the highest electronegativity on the Periodic Table.
What is Fluorine? Neon is a Noble gas, so is has no electronegativity.
List the name of this substance in English and Spanish:
KF
Potassium fluoride
Fluoruro de potasio
How many moles are there in 57.5 g water?
Water is H2O.
H = 1.00 g/mol * 2 = 2.00 g
O = 16.00 g/mol *1 = 16.00 g
Water total = 2+16 = 18.00 g/mol
57.5 g H2O | 1 mol = 3.19 mol
| 18.00 g
This is the formula for molarity.
What is M = n / L?
When the pH of a substance is lower, it is more...
What is acidic?
Name two properties of halogens.
- 7 valence electrons
- Highly chemically reactive
- Mostly gases
Balance this equation:
____ B2Br6 + ____ HNO3 --> ___ B(NO3)3 + ___ HBr
____ B2Br6 + __6__ HNO3 --> __2_ B(NO3)3 + _6__ HBr
This is the electron configuration for Silicon.
What is
1s2 2s2 2p6 3s2 3p2
You have 2 moles of a substance in 4 liters. What is its molarity?
What is 0.5 M? ( 2 moles / 4 L = 0.5 M)
The molarity of hydrogen ions in solution is 10-5. This means the pH of the solution is this number _________and it is described as _____________ .
What is 5 and described as acidic?
As you move from left to right on the Periodic Table, this is what happens to atomic radius.
It decreases, due to an increased positive charge from protons in the nucleus. As you move from top to bottom, atomic radius increases because of added shells of electrons.
Balance this equation:
____ (NH4)3PO4 + ____ Pb(NO3)4 --> ___ Pb3(PO4)4 + ___NH4NO3
__4__ (NH4)3PO4 + __3__ Pb(NO3)4 --> ___ Pb3(PO4)4 + __12_NH4NO3
If Lewis's car requires 50 L of diesel every time he refuels, how many moles of diesel does he need to buy?
Diesel = C12H26
1 L diesel = 850 grams
12 * 12 + 1 * 26 = 170 g/mol diesel
50 L * 850 g/L = 42500 g diesel
42500 g / 170 g/mol = 250 mol
How many liters of a 0.75 M solution of FeO can be made with 75.0 g FeO? (molar mass = 72 g/mol)
75 g * 1 mol / 72 g = 1.04 mol FeO
1.04 mol * 1 L / 0.75 mol = 1.38 L
The molarity of hydroxide ions in solution is 10-3. This means the pH is the number _________ and the solution is described as _____________ .
pH is 11 (pOH is 3) and the solution is described as basic.
Define an allotrope and provide an example.
Allotropes = two substances with the same chemical makeup but different orientations. Examples include diamond and coal, white/red/black phosphorus, and oxygen vs. ozone.
Name these four substances in English or Spanish - one of them requires roman numerals.
LiCl , MnO , Rb2S , C2H6
LiCl = Lithium chloride / cloruro de litio, MnO = Manganese (II) oxide / óxido de manganeso (II), Rb2S = Rubidium sulfide / sulfuro de rubidio , C2H6 = ethane / etano
If a car produces 50 g of carbon dioxide per minute and it constantly runs for all of January, how many moles will it produce?
C = 12.01, O = 16.00 x 2 = 32.00; 32+12 = 44 g/mol
50 g | 60 minutes | 24 hours | 31 days | 1 mol
min | 1 hour | 1 day | January | 44 g
Final answer: 50,727 moles of CO2
What is the molarity of a solution that contains 5.5 g of HCl (molar mass = 36.5 g/mol) dissolved in enough water to make 250 mL of solution?
250 mL = 0.25 L
5.5 g HCl * 1 mol / 36.5 g = 0.15 mol
0.15 mol / 0.25 L = 0.6 M
These are three examples of air pollutants and their sources.
Examples include:
CFCs: refrigerants, aerosols
Carbon dioxide: burning of fossil fuels
Methane: burning of fossil fuels, agriculture
NOx: industrial emissions, burning fossil fuels, agriculture
SOx: industrial emissions, burning coal
Carbon monoxide: burning fossil fuels
This is the heaviest element made in a typical fusion reaction inside of a star. Anything with a higher atomic weight was made in a supernova.
What is Iron?
Draw a structural formula and write the chemical formula for an alkane with 3 carbons, an alkene with 4 carbons, and an alkyne with 2 carbons.
See whiteboard.
This is the unabridged electron configuration for Plutonium.
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f6 OR 6d1 5f5 (I would accept either ending - this is due to the stabilization that occurs in some transition metals that was highlighted on the PNE question.)
How many grams of NaBr (molar mass = 102.9 g/mol) would be needed to prepare 700 ml of 0.230 M NaBr solution?
700 ml = 0.7 L
0.230 mol / 1 L * 0.7 L = 0.161 mol
0.161 mol * 102.9 g / mol = 16.6 g
You have 15 liters of an ideal gas at 20 degrees Celsius at 1.4 atm pressure.
The temperature decreases to 15 degrees Celsius and the pressure increases to 2 atm. What is the final volume of the gas?
Remember, 0 C = 273 K
P1V1/T1 = P2V2/T2
1.4 atm * 15 L / 293 K = 2 atm * x / 288 K
x = 10.3 L