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When 28.0 ml of 0.500 M H2SO4 is added to 28.0 ml of 1.00 M KOH in a coffee-cup calorimeter at 23.50 degrees Celsius, the temperature rises to 30.17 degrees Celsius. Calculate the delta H of this re
When a particular marble is dropped into a beaker of water, it sinks to the bottom. Which is the best explanation? A. The surface area of the marble is not large enough to be held up by the surface
A mixture of 82.49 g of aluminum ( Picture = 26.98 g/mol) and 117.65 g of oxygen ( Picture = 32.00 g/mol) is allowed to react. What mass of aluminum oxide ( Picture = 101.96 g/mol) can be formed?
What is the percent of Sulfate in 22.04 grams of Barium Sulfate?
how many moles of ethylene glycol should be added to the radiator to lower the freezing point of the water from 0 degrees celcius to -18 degrees celcius?
A gas has a volume of 534 mL at 25 degrees Celsius and under a pressure of 73.0 cmHg. Correct the volume to standard conditions. Which gas law would you use?
Obtain from your classmates, the molar enthalpies of neutralization of hydrochloric acid, sulfuric acid, and phosphoric acid when each reacts with sodium hydroxide. Write a chemical equation for ea
The activation energy for a particular reaction is 95 kJ/mol. By what factor will the rate constant increase when the temperature is increased from 50 oC to 62 oC?
Three solutions are mixed together to form a single solution. Write the next ionic equations for the precipitation reaction or reactions that occur.
Write net ionic equations for the following molecular equations. HBr is a strong electrolyte. (Include states-of-matter under SATP conditions in your answer. Use the lowest possible coefficients.)
If 19.0 mL of 0.800 M~rm HCl solution are needed to neutralize 5.00 rm mL of a household ammonia solution, what is the molar concentration of the ammonia?
A 32.65-g sample of a solid is placed in a flask. Liquid toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.00 ml. The solid
When cyclopentane is exposed to Br2 in the presence of light, reaction occurs. Write the formulas of all possible monobromination products. Draw molecule by placing atoms on grid.
A metal objet with a mass of 19 g is heated to 96 degree celcieus, then tranfered to a clorimeter containing 75 g of water at 18 degree celcieus. The water and metal objet reach a final temperature
Calculate the work that a person of mass 65kg must do to climb betweencalculate the work that a person of mass 65kg must do to climb between two floors of a building seperated by 4.0m.
Equal volumes of water (density 1.00g/mL) and ethyl alcohol (density 0.789g/mL) are combined. If the total volume is 190% of volume of each component, what is the density of the solution?
What is the percent yield of a reaction in which 212 g phosphorus trichloride reacts with excess water to form 137 g HCl and aqueous phosphorus acid (H3PO3)?
A gold bar weighing 33.5g and having an initial temperature of 25.0 degrees Celsius, absorbs 5,000 joules of heat. What would be its new temperature?
A sample of an unknown gas effuses in 10.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.07 min. What is the molar mass of the unknown gas?
Suppose that a sample of gas occupies 73 mL of volume at 25C and a pressure of 266 torr. What would be the volume if the pressure were changed to 645 torr at 25C?
A 45-year-old woman is receiving a ‘combined modality' treatment for the initial stage of breast cancer. State the two aspects included in this treatment. State the methods by which a radiati
How large (in kg) an oxygen candle (KClO3) would be needed to supply 8 people with enough oxygen for 24 hours on a small submarine? Although this depends on the size of the person and their respira
Mercury has a density of 13.6 g per mL. A barometer holding 9.50mL of mercury has broken. The cost of mercury disposal is based on mass. How many kilograms of mercury were in the barometer?
An Auto mechanic spills 91 mL of 2.3 M H2SO4 solution from a rebuilt auto battery. How many milliliters of 1.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid?
Clausthalite is a mineral composed of lead selenide (PbSe). The mineral adopts a NaCl-type structure. The density of PbSe at 25C is 8.27g/cm^3. Calculate the length of an edge of the PbSe unit c