10/28/20

What is the molarity of a solution prepared by mixing 12.5g FeCl3 in enough water to make 500mL of solution/
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10/28/20

What is the energy of the original photon?
A hydrogen atom absorbs a photon and its electron is excited to a higher energy level. Instead of immediately relaxing down to its original energy level, the electron first drops to an intermediate... more
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10/27/20

Arrange the atoms:

Arrange the atoms: Rb, O, Si, Cs, in order of increasing first ionization energy. Only type in the chemical symbols in the blanks. 
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10/27/20

Maximum Revenue
The manager of a large apartment complex knows from experience that 120 units will be occupied if the rent is 496 dollars per month. A market survey suggests that, on the average, one additional... more
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10/26/20

need help with this
If a car travels 376.9 miles on 48 liters of gas, how many liters of gas will it take to go 699 miles if the car travels at the same rate? (Round to the nearest tenth)
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10/26/20

thermal equilibrium
Part A. What is the energy change when the temperature of 10.4 grams of solid sulfur is decreased from 35.3 °C to 22.4 °C?Answer:  JoulesPart B.A chunk of aluminum weighing 18.5 grams and... more
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10/26/20

specific heat to energy or temp
A. In the laboratory a student finds that it takes 3.05×103 Joules to increase the temperature of 14.9 grams of gaseous hydrogen from 21.3 to 36.8 degrees Celsius.The specific heat of hydrogen he... more
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10/25/20

specific heat capacity of liquid
The temperature of the solution increases from 21.3 °C to 38.2 °C.0.468 g Mg reacting0.0193 mol Mg reacting80.844 g HCl solutionThe energy released is given byq = specific heat × mass × temperature... more
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10/25/20

the number of grams of hydrogen in the mixture is g.
A mixture of xenon and hydrogen gases is maintained in a 6.64 L flask at a pressure of 3.75 atm and a temperature of 45 °C. If the gas mixture contains 88.0 grams of xenon, the number of grams... more
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10/24/20

Write an equation of a line that passes through point A(4,-5) and is parallel to the line y=4x-3
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10/24/20

Choose the equation that represents a line that passes through points (−6, 4) and (2, 0). A x + 2y = 2 B 2x − y = −16 C x + 2y = −8 D 2x + y = 4
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10/24/20

Molarity: Ion Concentration
In the laboratory you dissolve 20.3 g of barium acetate in a volumetric flask and add water to a total volume of 375 mL.What is the molarity of the solution?   M.What is the concentration of... more
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10/24/20

Combustion Analysis
When 6.508 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 20.42 grams of CO2 and 8.361 grams of H2O were produced.In a separate experiment, the molar mass of the... more
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10/24/20

Find the values of x and y that make both equations true 3x+y= 4 4x+y= 10
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10/24/20

How many grams of O2 are needed to completely react with 5.0 g of butane in a butane lighter?
I was given the balanced equation: 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O. I have done the conversion to find that 5 g of butane is .09 moles of butane. I am unsure where to start when it comes to the... more
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10/24/20

The emission spectrum from atoms and molecules
a. Occurs only in the visible region of the electromagnetic spectrumb. Is a discrete spectrum that is unique to each atom or moleculec. Is a continuous spectrumd. Is a descrete spectrum that is the... more
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10/24/20

What mass of carbon dioxide is produced from the complete combustion of 5.80×10−3 g of methane?
I need help before 11:00pm, thank you.
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10/23/20

Use specific heat energy
The specific heat capacity of solid copper is 0.385 J/g °C.(a) Determine the amount of heat energy that is associated with heating a 13.4-g sample of solid copper from 22.2 °C to 39.6 °C. J(b)... more
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10/23/20

How to solve this calculation (about chemical)
 It is time for the titration. You measure 15.0 mL of the H2C2O4 solution with a 100-mL graduated cylinder and add it to a 125-mL Erlenmeyer flask. Then you add two drops of the indicator,... more
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10/23/20

21 – (13 +4) = y +18
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10/23/20

Jasmine plans to sew fringe around a circular pillow with a radius of 5 inches. How much fringe does she need to purchase?

If Jasmine needs to order fabric material to make the pillow cover. If she needs an additional inch of fabric to allow for seams and she wants to cover both sides of the pillow, how much material... more
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10/23/20

What is the pH of a 0.41 M HCl solution?
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10/23/20

Please help me thx u
Baking soda is a white powder used for baking or cleaning. When you mix baking soda, NaHCO3, with vinegar, C2H4O2, you get a clear colorless liquid and bubbles of CO2. Specify the phase of each of... more
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10/21/20

Aluminum Oxide Experiment
If the experiment was used on 0.95g aluminum, what mass of aluminum oxide would be theoretically produced?
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10/20/20

A sample of nitrogen (N2) has a volume of 53.0 L at a pressure of 750. mmHg .

A sample of nitrogen (N2) has a volume of 53.0 L at a pressure of 750. mmHg . What is the final volume, in liters, of the gas at each of the following pressures, if there is no change in... more
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