09/07/22

How would I go about this? What is the wavelength (in nanometres) of a photon of light with an energy of 8.14x 10^-18J? Answer in Sig figs?

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09/07/22

Please help me!!! Due tonight 11:59. Chemistry: Mass, Vol., Density
A sheet of aluminum (density = 2.60 g/cm3) has dimensions of 4.75 mm x 1.80 m x 2.48 ft. Calculate its mass in pounds. Your calculation should show all necessary unit conversions.
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09/07/22

What is the activation energy of this reaction?
A student collected time (t) and concentration ([A]) data at 295 K for the reaction 2A→B.The student ran the same reaction at a different temperature and measured a different reaction rate, with... more
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09/07/22

What is the mass (in grams) of a cylinderical wire made of iron metal that has a diameter of 0.19mm and a length of 14.59cm?
Iron has a density of 7.87 g/mL and the volume of the cylinger is given by V=(pie)r^2(h)
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09/07/22

A sphere was composed of an unknown pure substance. What is the density (in g/cm^3) of the material
if the sphere has a diameter of 30.79um and a mass of 25.6ng?The volume of a spherical object is given by V = ((4/3)(Pie)(r^3)Two demical place answer with units in the answer.
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09/07/22

Select all of the following sets of numbers that are not allowed sets of quantum numbers (n, l, ml, ms).
A. (2, 1, −2, 1/2)B. (1, 1, 1, 1/2)C. (2, 0, −1, −3/2)D. (2, 1, −1, 1/2)E.(3, 2, −2, −1/2)The more I think about it, I'm pretty sure all of them are wrong, but I want to be sure.
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09/07/22

What are the frequency and energy of a photon with a wavelength of 670. nm?
I just need the frequency. I keep getting it wrong and I don't know what I'm doing wrong.
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09/07/22

Can Livermorium, Oxygen and Sulfur combine and if so, what is its structure?
Would Lv, O, and S just have a single bond each if they combined? It would also be much appreciated if someone could explain the structure. Thankyou :)
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09/06/22

how many grams of oxygen are required to react with 14.0 grams of octane in the combustion of octane in gasoline
chemistry
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09/06/22

A 0.770g piece of lithium metal is dropped into a mixture of 50.0g water and 50.0g ice, both at 0 degrees C.
The reaction is 2Li + 2H2O = 2 LiOH + H2. Hrxn = -446 Kj/mol. Assuming no heat is lost to the surroundings, and that the final mixture has a specific heat capacity of 4.18J/g x degrees C.... more
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09/05/22

A human hair is 75.0 µm across. How many inches is this?
75.0 µm × (----) × (----) = ____
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09/05/22

Help with Chemistry please!!
The following questions deal with the nature of light and color. (Enter your answers using scientific notation.)(a) A photon has a wavelength of 440. nanometers (nm). What is the length in... more
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09/05/22

Help with Pre-Lab questions! I have already looked at videos and it still doesn't make sense!
When ionic solids dissolve in water, they produce soluble aqueous cations and anions. For example, adding MgBr2 solids to water will produce ions according to the dissolution... more
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09/05/22

What is the molecular weight they determined for this compound ?
The freezing point of water, H2O, is 0.000 °C at 1 atmosphere. Kf(water) = -1.86 °C/mIn a laboratory experiment, students synthesized a new compound and found that when 10.98 grams of the compound... more
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09/05/22

What is the molecular weight they determined for this compound?
In a laboratory experiment, students synthesized a new compound and found that when 11.72 grams of the compound were dissolved to make 233.4 mL of a benzene solution, the osmotic pressure generated... more
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09/05/22

How many grams of aspirin, C9H8O4, a nonvolatile, nonelectrolyte (MW = 180.1 g/mol), must be added to 258.6 grams of chloroform to reduce the vapor pressure to 171.38 mm Hg?
The vapor pressure of chloroform is 173.11 mm Hg at 25°C.How many grams of aspirin, C9H8O4, a nonvolatile, nonelectrolyte (MW = 180.1 g/mol), must be added to 258.6 grams of chloroform to reduce... more
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09/05/22

The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is estrogen.
The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is estrogen.Calculate the vapor pressure of the solution at 25 °C... more
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09/05/22

How many grams of estrogen, C18H24O2 (272.4 g/mol), must be dissolved in 205.0 grams of benzene to reduce the freezing point by 0.400°C ?
The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is estrogen (estradiol).How many grams of estrogen, C18H24O2 (272.4 g/mol),... more
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09/05/22

The freezing point of water H2O is 0.00°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in water is sucrose.
The freezing point of water H2O is 0.00°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in water is sucrose.If 10.98 grams of sucrose, C12H22O11 (342.3 g/mol), are dissolved... more
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09/05/22

Help me solve this!!!
The given solubility of X at 100ºC in water is 17.0 g/100 mL of water and the other given solubility of X at 0ºC in water is 3.5 g/100 mL of water. How many mL of boiling water would be required to... more
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09/04/22

A piston has an external pressure of 10.0 atm . How much work has been done in joules if the cylinder goes from a volume of 0.140 liters to 0.470 liters?
The joule (JJ) is a unit of energy. Recall that energy may be converted between many different forms such as mechanical energy, thermal energy (heat), chemical energy, electrical energy, and... more
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09/03/22

How much aluminum hydroxide in kilogram is needed for the batch size?
Antacid tabletAluminum hydroxide - 325 mgMannitol - 812 mgSodium saccharin - 0.4 mgSorbitol (10% w/v solution) - 32.5 mgMagnesium stearate - 35 mgMint flavor concentrate - 4 mgBatch size: 150,000... more
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09/03/22

Is energy always associated with biochemical processes?
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09/03/22

calculate the molarity of 20% sulfuric acid solution with a specific gravity of 1.96
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09/03/22

calculate the molarity

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