10/03/19

Write the chemical formula for the compound formed by each pair of positive and negative ions.
Ba2+ and NO3-?Al3+ and CO32-?K+ and PO43-?
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10/02/19

What is the energy of a photon of red light having a frequency of 5.16 ✕ 1014 Hz?
What is the energy of a photon of red light having a frequency of 5.16 ✕ 1014 Hz?
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10/02/19

What is the frequency of electromagnetic radiation having a wavelength of 2.26 ✕ 10-8 m? s-1 What type of electromagnetic radiation is this?
What is the frequency of electromagnetic radiation having a wavelength of 2.26 ✕ 10-8 m?  s-1 What type of electromagnetic radiation is this?
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10/02/19

What is the wavelength of electromagnetic radiation having a frequency of 7.86 ✕ 1012 Hz?
What is the wavelength of electromagnetic radiation having a frequency of 7.86 ✕ 1012 Hz?
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10/01/19

How many moles of CaSO4 are in 8.55×1024 formula units?
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09/30/19

According to the following reaction, how many grams of bromine trifluoride are needed to form 21.5 grams of fluorine gas?
According to the following reaction, how many grams of bromine trifluoride are needed to form 21.5 grams of fluorine gas?bromine trifluoride (g) bromine (g) + fluorine (g)
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09/30/19

What is the empirical formula of the unknown compound?
An unknown compound contains only C , H , and O . Combustion of 3.50 g of this compound produced 8.24 g CO2 and 2.25 g H2O . What is the empirical formula of the unknown compound? Insert subscripts... more
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09/29/19

Calculate the quantity of energy needed to heat 8.0 g of water from 42.0 °C to 45.0 °C. Report your answers in scientific notation.
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09/26/19

Chemistry Questions
Seawater contains 8.0*10^-1 cg of the element strontium per kilogram of seawater. Assuming that all the strontium could be recovered, how many grams of strontium could be obtained from one cubic... more
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09/23/19

Chemistry Calculation
The cost per square inch in dollars/in^2 of aluminum foil is 0.000144.The grams per square inch (g/in^2) of the aluminum foil is 0.0043.How do I determine the cost per gram ($) of the aluminum foil... more
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09/23/19

Dioptase is a mineral that contains 45.3% of copper. How many meter of wire with diameter of 0.0571 in can be produced from 3.54 lb of dioptase?

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09/18/19

College Algebra
The area of a rectangular wall of a barn is 100 square feet. its length is 10 feet longer than twice its width find the length and width of the barn
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09/14/19

Isabella has a bag of candy. She gives 1/2 of the bag to Kaleb. Kaleb gives 1/3 of the candy he now has to scott. If Scott has 5 pieces of candy, how many were in Isabella's original bag? draw example
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09/12/19

C 7.682 H 7.682 What is the empirical formula of the compound?
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09/12/19

Determine the number of moles of CO2 i 10.00g sample of CO2
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09/12/19

Light travels at 3.00 times 10^8 m/s. how long does it take light to travel from the sun to the earth(in units of minutes), a distance of 1.47 * 10^8km
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09/12/19

Stoichiometry of NH3
How many grams of NH3 can be produced from 4.29 mol of N2 and excess H2.Please explain how you got the answer.
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09/12/19

A patient receives an IV of 20,000. units of heparin in a 100.0 mL bag over 45.0 minutes. If the pump is calibrated to 15.0 drops/mL, what is the drops per minute rate?
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09/12/19

intro to chemistry

In an experiment, a student transfered 4.50 mL of a liquid into a beaker that weighed 35.986 g when empty. The combined weight of the beaker with the liquid was found to be 40.785 g. What is the... more
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09/12/19

The gas tank of a certain luxury automobile holds 22.3 gallons according to the owners manual. If the density of gasoline is 0.8206g/mL, determine the mass in pounds of the fuel in a full tank
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09/11/19

If on scale drawing 4 centimeter equals 5 kilometers how many centimeters do we need to have 4 kilometers

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09/11/19

Given if 2 fardells = 1 nooke 4nooke = 1 yard. 4yards = 1kide How many fardells are there in 6.00 life’s

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09/11/19

chemistry homework

If you burn 34.3 g of hydrogen and produce 306 g of water, how much oxygen reacted?Mass of oxygen= g?
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09/11/19

Chem: change in mass
Explain what it means to have a change in mass.
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09/10/19

how many grams of oxygen are contained in 10.5 liters of oxygen measured over water at 25 C and 740 mm Hg? Vapor pressure of water at 25 C is 24mm Hg
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