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Microwave ovens work by irradiating food with microwave radiation, which is absorbed and converted into heat.
Assuming that radiation with ?=15.0 cm is used, that all the energy is converted to heat, and that 4.184 J is needed to raise the temperature of 1.00 g of water by 1.00 ^0C , how many photons are necessary to raise the temperature of a 350 mL cup of water from 25 ^0C to 95 ^0C?
There are many types of energy: electrical, kinetic, gravitational potential, chemical, elastic, heat, etc. Choose an object or system in which energy is transformed from one form to another. Describe the energy transformations in this object or s..
A 20 mg sample of zinc is heated at 10 K min-1, and the peak on the DSC trace has an area of 0.371 W K. Calculate the latent heat of melting of zinc (in kJ mol-1)?
Which of the following compounds would you expect to be ionic?
A sample of bananas in water is found to have a [H3O1+] = 2.51 x 10-5M. What is the pH of the solution? Are bananas acidic (A), basic (B), or neutral (N)
if grams of ammonia are reacted with 4.75 grams of oxygen gas, how many grams of nitrogen oxide will be produced.
If 0.7438 g of potassium hydrogen phthalate is used and the equivalence point occurs at 33.00 mL of NaOH, calculate the molarity of the NaOH solution to the correct number of significant figures.
What mass of copper would you expect to be deposited from a copper (II) sulphate solution using a current
0.45 g of hydrogen chloride (HCL) is dissolved in water to make 4.5 L of solution. What is thepH of the resulting hydrochloric acid solution. 0.65 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 2.5L of solution. What is the pH..
A compressed air tank carried by scuba divers has a volume of 8.0L and a pressure of 140 atm at 200C. what is the volume of air in the tank in liters at STP
it is found that the concentration of Pb2+ in a saturated solution of lead bromide is 1.2x10^-2M. what is the ksp for PbBr2
a 10.0-g sample of ice at -20.0degc is mixed with 105.0 g of water at 75.0degc. calculate the final temperature of the
The Haber process is very important for agriculture because it converts N2 (g) from the atmosphere into bound nitrogen which can be taken up and used by plants. The reaction is N2 + H2->NH3
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