More free chemistry help videos: www.nathanoldridge.com How to Calculate the Molar Mass of elements and molecules Elements: Easy, just look at the periodic table. Molecules: Add up the masses of the atoms that form the compound. For example, an oxygen atom weighs 16.00 g/mol according to the periodic table. So an O2 molecule would weigh 2 x 16.00 g/mol = 32.00 g/mol
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More free chemistry help videos: www.nathanoldridge.com How to Draw Lewis Structures (aka Lewis Dot Diagrams) In this video I explain how to draw simple Lewis Structures, while drawing the Lewis structure for a simple molecule (HCN).
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More free chemistry help videos: www.nathanoldridge.com How to Calculate the number of moles, given the mass of a substance. n = m / M where n = number of moles m = mass in grams M = molar mass (see www.youtube.com
More free chemistry help videos: www.nathanoldridge.com How do you calculate the mass of a substance, given the number of moles? m = Mn where m = mass in grams n = number of moles M = molar mass (see www.youtube.com Visit www.nathanoldridge.com for more videos like these!
More free chemistry help videos: www.nathanoldridge.com What's inside of an atom? The answer is protons and neutrons (which together make the nucleus), and electrons (which are found in the empty space around the nucleus). The number of protons determines which element it is. The number of electrons determines the charge on the atom (two more electrons than protons? Total charge on the atom is -2. three more protons than electrons? Total charge on the atom is +3).
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What are the Pauli Exclusion Principle, Aufbau Principle, and Hunds Rule? They are rules we use to fill electron orbital filling diagrams. Fill from the bottom up, Spread them out before you double up, and always have one up one down in each orbital.
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More free chemistry help videos: www.nathanoldridge.com How do you figure out what the limiting reagent is?
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More free chemistry help videos: www.nathanoldridge.com Here I show how to calculate the pH of a solution made with a weak acid Summary: Use Ka to determine how much of your original acid dissociates to give H+. Then you can plug that concentration of H+, [H+], right into the pH formula.
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More free chemistry help videos: www.nathanoldridge.com How to Draw Resonance Structures from Lewis Structures (aka Lewis Dot Diagrams) In this video I explain the Resonance Sturcture of HNO3, after having drawn the Lewis structure. Basically, resonance structures are two different Lewis structures that are both acceptable for a given molecule. The actual electron arrangement of the molecule in real life is likely a combination of both resonance structures.
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More free chemistry help videos: www.nathanoldridge.com How do you calculate the theoretical yield of a chemical reaction? More free chemistry help videos: www.nathanoldridge.com 1. Find the limiting reagent, and how many moles of it you have. 2. Figure out how many moles of product you will make if you use up ALL of the limiting reagent. 3. Convert that amount to grams, if necessary.
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More free chemistry help videos: www.nathanoldridge.com What is the percent composition of (NH4)2S? First calculate the mass of one (NH4)2S molecule: - Add up the masses of each atom from the periodic table Second, divide the mass of each atom by the total mass of the molecule. Make sure you account for the fact that there are 2 N atoms and 8 H atoms!
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What are the four quantum numbers? This video gives their names, their letters and their possible values.
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How to draw the Lewis Diagram for Sulfate (SO4 2-). Sulfur does not obey the Octet Rule (because it's in the third row of the table)! Formal charges on each atom need to be minimized.
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How to ger concentration (mol/L) of a solution from the mass (grams) of salt dissolved in water. You'll need to know the volume of water used. C=n/V, and n=m/M.
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More free chemistry help videos: www.nathanoldridge.com How to Draw Lewis Structures (aka Lewis Dot Diagrams) for Charged Molecules In this video I explain how to draw Lewis Structures for Acids, while drawing the Lewis structure for HNO3. The key is that extra Hs usually attach to the oxygen atoms.
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More free chemistry help videos: www.nathanoldridge.com How do you figure out which reactant is the limiting reagent? Here, we walk you through a general way to do it, and illustrate with an example we used in a previous video.
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More free chemistry help videos: www.nathanoldridge.com How do you write an Equilibrium Expression? How do you find the formula for Keq? Summary: To get the numerator of the expression: multiply together the concentrations of all products (each raised to the power of their coefficient in a balanced chemical equation). To get the denominator, do the same for the reactant side of the equation. DO NOT use substances that are solid or liquid ... only gas-phase and aqueous-phase concentrations are allowed.
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More free chemistry help videos: www.nathanoldridge.com How do you figure out which reactant is the limiting reagent? No example is given here, just the step-by-step instructions for figuring it out.
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More free chemistry help videos: www.nathanoldridge.com This is the easiest way to figure out how each atom's orbitals are hybridized.
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More free chemistry help videos: www.nathanoldridge.com Here I show how to calculate the pH of a solution made with a Strong Base Summary: Use the concentration of base and the number of OH- ions per molecule to calculate the concentration of OH-. Then, you can calculate the pOH as I did, or calculate [H+] since Kw = [H+][OH-] (more on this formula in a later video).
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Why do the Quantum Numbers matter? They are a tool, invented by scientists, to explain how many orbitals are in each energy level, and how many electrons can go in each orbital.
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How to tell if a bond is Ionic, Covalent or Polar Covalent. You have to calculate the difference in electronegativities between the atoms ... the difference tell you which you have!
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How to calculate the concentration of a solution if you're given the number of moles of solute and the volume you are mixing it into. C = n/V
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How to convert a volume into an amount in moles. You need the concentration of the solution to do this. n = CV.
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How to find the pH of a solution when HCl and NaOH are mixed. Assume the neutralization goes to 100% completion and then figure out how much HCl or NaOH remains.
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More free chemistry help videos: www.nathanoldridge.com Here I go through a calculation of the pH of a solution made with a weak acid. I use an approximation to make the math much easier! Summary: Use Ka to determine how much of your original acid dissociates to give H+. Then you can plug that concentration of H+, [H+], right into the pH formula. Also, if Ka is really small (less than 10^-3, you can use an approximation like I do in the video to make the math simpler.
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More free chemistry help videos: www.nathanoldridge.com What is the percent composition of NaOH? First calculate the mass of one NaOH molecule: - Add up the masses of each atom from the periodic table Second, divide the mass of each atom by the total mass of the molecule.
More free chemistry help videos: www.nathanoldridge.com Here I show how to calculate the pH of a solution made with a strong acid (like HCl, H2SO4, HNO3, HBr, HClO4, HI, etc) Remember to account for how MANY H+ ions come from each molecule ... H2SO4 gives 2 H+ when it dissociates.
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How many significant figures are in a number? Don't memorize complex rules ... here's THREE that will get you the right answer each time.
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Given the light's wavelength, This video shows how to figure out if electrons will be ejected from a metal by the photoelectric effect. Figure out how much energy each photon has, and compare that energy to the "Binding Energy" of the metal.
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How to draw the Bohr-Rutherford Diagram for Phosphorous. 2 electrons can go in the first shell, 8 in the second, 8 in the third, and so on...
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How to Get Frequency from Wavelength. Frequency = Speed of Light divided by wavelength.
How to draw the Bohr-Rutherford Diagram for Potassium. 2 electrons can go in the first shell, 8 in the second, 8 in the third, and so on...
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When you add or subtract numbers, how do you know what to round it to? This will show you exactly what to do, with an example.
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