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A 25.0 g piece of aluminum is dropped into a beaker of water. The temperature of the aluminum drops from 94 degrees C to 67 degress C. Explain what quantity of heat energy did the piece of aluminum give off?
If someone puts .600 mL of a 3.00% hydrogen peroxide solution on a cut, how many moles of hydrogen peroxide are used. Assume the density of the solution is equal to the density of water.
What ion(s) will form? Will urea act as an acid or a base and will the resulting solutions be acidic, basic, or neutral
When chlorine is added to acetylene, 1,1,2,2-tetrachlorothane is formed. How many liters of chlorine will be needed to mkae 75.0g of C2H2Cl4
Calculate the molarity of ammonium bromide solution. Use the molarity of the solution to find the mass of ammonium bromide in 1.00 L of this solution.
a piece of copper metal weighing 145 grams was heated to 100.0c and then dropped into 250. grams of water at 25.0 c.
Add charges, single electron dots, and/or pairs of dots as appropriate to show the Lewis symbols for the most stable ion of each element. Treat n=4 as the valence shell in all cases.
a solution is prepared by dissolving 4.21g of a nonelectrolyte in 50.0 g of water. if the boiling point increases by
How many moles of Cr(OH)3 will dissolve in 1.00 L of a solution with a pH of 5.13. (Assume the pH does not change as the Cr(OH)3 is placed in the water.) (Ksp for Cr(OH)3 is 6.7 x 10-31)
determine the trend in sizes of the ions o2-n3- f- and also explain why does the trend exist? also describe which of
An astrophysicist working at an observatory is interested in finding clouds of hydrogen in the galaxy. Usually hydrogen is detected by looking for the Balmer series of spectral lines in the visible spectrum. Unfortunately, the instrument that dete..
A 144-mL portion of that solution is diluted by adding 169 mL of water. What is the final concentration? Assume the volumes are additive.
a balloon originally had volume of 0.439 l at 44 c and a pressureof 729 torr. to what temperature much the balloon be
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