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A 0.221 g pellet of potassium hydroxide,KOH, is added to 52.2 g water in a Styrofoam coffee cup. The water temperature rises from 23.5 to 24.4 °C. (Assume that the specific heat of dilute KOH a
The other is two (1,1-dimethyl)propyl, How to distinguish the aromatic proton signal when they are the three possible position: para, meta and ortho?
What is the net ionic and ionic equation of ferric chloride + sodium hydroxide?
A student placed 20.0g of glucose in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.0 mL mark on the neck of the flas
(a) How high above the ground is the highest point that the skateboarder reaches? (b) When the skateboarder reaches the highest point, how far is this point horizontally from the end of the ramp?
After heating & cooling a 2.752-g sample of this unknown weighed 1.941 g. Could the unknown possibly have been Sr(NO3)2*4H20? Briefly explain & What is the probable identity of the student'
A boy whirls a stone in a horizontal circle 2.0 m above the ground by mean of a string 1.5 m long. The string breaks, and the stone flies off horizontally and strikes the ground 10 m away. What was
a saturated solution contains 11.0 g NaBrO3 in 40.0 mL of water at 0 degree Celsius. What is the solubility in g solute/(100 g H2O)? Calculate the mole fraction at this temperature.
A children's pain relief elixir contains 80.mg acetaminophen per o.50 teaspoon. The dosage recommended for a child who weighs between 24 and 35 lb is 1.5 teaspoons. What is the range of acetaminophe
Describe the metallic bonding with the help of valence bond theory.
A gas cylinder containing 6.38 mol of neon has a pressure of 491 mmHg at 295 k. If 3.22 mol helium is added at constant temp and pressure, what will be the pressure in the cylinder?"
A piston has an external pressure of 8.00. How much work has been done if the cylinder goes from a volume of 0.130 liters to 0.450 liters.
When sulfuric acid is a component of polluted air, it chemically attacks statues, memorials, and monuments made from limestone. Given that the most common mineral in limestone is calcium carbonate,
If carbon dioxide gas is collected over water at 25 °C and 775 torr, what is the partial pressure of the CO2? The vapor pressure of water at 25 °C is 23.8 torr.
A hypothetical element Z has two stable isotopes: Z-46 = 46.046 u 64.08% Z-51 = 50.826 u 35.92% What is the average atom weight of the element?
You are hanging on to the edge of a merry-go-round, and must exert a force of 100 N to hang on. If the speed of the merry-go-round doubles, how much force will you need to exert to hang on?
Does doubling the volumes of acid and base in a neutralization reaction double the amount of heat released? And also does doubling the concentrations (but not the volumes) of acid.
A 45.5 g sample of copper at 99.8 degrees celsius is dropped into a beaker containing 152 g of water at 18.5 degrees celsius. What is the final temperature when thermal equilibrium is reached?
A raft is made of 11 logs lashed together. Each is 35 cm in diameter and has a length of 5.6 m. How many people can the raft hold before they start getting their feet wet, assuming the average perso
Linuron or 1-Methoxy-1-methyl-3-(3,4-dichlorophenyl)urea, is a biologically active compound of commercial importance. Write down the chemical structure of linuron.
What is the minimum concentration of {rm{OH}}^ - required to dissolve 2.0×10-2 mol of {rm{Zn(OH)}}_2 in a liter of solution?
Silver chloride often used in silver plating contains 75.27% Ag. Calculate the mass of silver chloride in grams required to make 4.0 g of silver plating.
The following reaction has achieved equilibrium. Predict the effect on the formation of phosphorous pentachloride (increase, decrease or no effect) for the stated changes to the system:
Calculate the energy released when a 28.9 gram piece of copper is cooled from its melting point of 1083 degrees C to 25.0 degrees C. The specific heat of copper is .385 J/g degrees C.
A 952 cm3 container of gas is exerting a pressure of 108 kPa while at a temperature of 48 oC. Calculate the pressure of this same amount of gas in a 1236 cm3 container at a temperature of 64 oC