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The amount of carbon-14 in ancient artifacts and fossils is often used to establish their age. Determine the number of protons and neutrons in a carbon-14 isotope and write its symbol in the form
Determine the mean and 90% confidence interval for the average fluoride concentration in this sample.
A lucky individual wins a lottery. The prize in the lottery is one mole of dollars( 1.00mol). This particular individualdecides that they want to spend all of the money they just won
What weight of Pb(NO2)2 wil have to be dissolved in one liter of water to prepare a 100ppm Pb2+ solution.
How much heat (in kJ) is needed when 58.9 g of water warms and boils from 47.91 degrees C to 100 degrees C
The highest possible oxidation state for halogens is +7 and the lowest possible is -1. Which of the following could not disproportionate?
The pH after adding 5.0mL, 10.0mL, 15.0mL, 20.0mL (keeps increasing by 5)... 50mL of KOH aqueous solution to the 50.0 mL sample of the HF solution.
An acidic aqueous solution of AlBr3 is in an electrolytic cell. What reactions take place at the anode and the cathode.
C5H12O, a gasoline additive used to boost octane ratings, has a standard heat of formation of -313.6kJ/mol. write a balanced equation for its combustion reaction, and calculate its standard heat of combustion in Kilojoules
The following processes occur in an internal combustion engine. For which one is the entropy change negative
A solution is prepared by dissolving 138.50 g of sucrose, a nonelectrolyte, in 250.0 g of dionized water. The freezing point of the solution was determined experimentally to be -3.0 C.
Why are the injection port and detector always heated to higher temperatures than the column in a gas chromatograph
concentrated hydrofluoric acid is 28.9M and has a density of 1.18g/mL. What is the weight percent of concentrated HF?
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