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A sample of gas is compressed from 13.01 L to 4.27 L using a constant external pressure of 3.63 atm. At the same time, 1,453 J of heat flows into the surroundings. What is the internal energy change for the gas?
classfy each reaction as cmbnation, decompositon, single replacement, double replacement, or combustion
Calculate the pH during the titration of 32 mL of 1.149 x 10-1 M NaOH with 1.161 x 10-1 M HBr solution after the following additions of acid.
calculate the volume of nitrogen gas produced from 195.0 grams of sodium azide at 27.0 celsius and 836.0 mmHg pressure
how many mL of 0.122M MnO4^-1 are required to react with an excess of C2O4^2- in order to produce 75.25 mL of carbon dioxide gas measured at 30.0 degree c and 715 torr?
Compare the natural chemistry that takes place in the environment with the chemistry that takes place due to manmade factors like pollution. Discuss the effect of pollution at the local, regional, national, and global level.
A graduated cylinder contains 152 mL of water. A 14.0 g piece of iron (density = 7.86 rm{g/cm^3}) and a 16.0 g piece of lead are added. What is the new water level in the cylinder?
How many milliliters of a 0.28 M HCl solution are needed to react completely with 8.4 g of zinc to form zinc(II) chloride? Answer in units of mL.
The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration. How long will it take for 10% of the U-238 atoms in a sample of U-238 to decay?
Explain why a buffer made of equal concentrations of CH3COOH and CH3COO- does not change in pH when a small amount of NaOH (a strong base) is added to the solution. Does the NaOH dissociate into ions when it is added to the solution?
At a pressure of 1.00 atm and a temperature of 20ºC, 1.72 g CO2 will dissolve in 1 L of water. How much CO2 will dissolve if the pressure is raised to 1.35 atm and the temperature stays the same?
iodized salt is a mix of NaCl and KI. if the content of 75 ppm what is the iodine content?
Consider a piece of gold jewelry that weighs 9.78 g and has a volume of 0.680 cm3. The jewelry contains only gold and silver, which have densities of 19.3 g/cm3 and 10.5 g/cm3, respectively.
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