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Calculate change in enthalpy for the following reactions:
A physics student stands on a bathroom scale in an elevator which is not moving. The scale reads 620 N. The elevator then accelerates downward at 1.36 m/s2. What does the scale read during this acc
The final temperature of the mixture is 30.4?C. What is the specific heat capacity of the metal? Assume that there is no energy lost to the surroundings.
Write and balance the double replacement reaction of sodium hydroxide and oxalic acid(H2C2O4). How many moles of base are needed to neutralize one mole of acid? (H2C2O4 <=> 2H^+ + C2O4^2-)
A reaction vessel contains these compounds at equilibrium. What will happen if the volume of the container is reduced by 50% at constant temperature?
Calculate the number of representative particles for 0.150 mol NaCl
A gas expands and does P-V work on the surroundings equal to 323 J. At the same time, it absorbs 145 J of heat from the surroundings. Calculate the change in energy of the gas.
A magnetic computer disk 9.44 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates 520.0 rad/s2 for 0.500s, then coasts at a steady angular veloc
If 141 mL of wet H2 is collected over water at 24°C and a barometric pressure of 738 torr, how many grams of Zn have been consumed?
10.00 mL of a solution containing 0.17 M NaCl and 0.23 M AlCl3 is introduced into a fully charged cation exchange column. How many moles of hydronium ions will be released by the column?
The wavelength corresponding to threshold frequency to tungsten surface is 230nm. Calculate the kinetic energy of the photoelectron ejected from the surface of tungsten metal,if it is irradiated wi
A 125 mL sample of dry air at 230 degrees celcius is cooled to 100 degrees celsius at constant pressure. What volume will the dry air occupy at 100 degrees celsius?
Commercial concentrated aqueous ammonia is 28% NH3 by mass and has a density of 0.90 g/ml. What is molarity?
Considering which elements are being oxidized and reduced, determine how many moles of electrons are transferred between the elements being oxidized and reduced.
The amount of 4-bromonitrobenzene actually isolated to estimate the experimental yield of mononitration in the reaction. What errors are there in using this method to calculate the extent of mononit
A local AM radio station broadcasts at a frequency of 669 KHz. Calculate the energy of the frequency at which they are broadcasting. (In kilojoules)
Calculate the pH of each of the following buffered solutions.
How many grams of CO2 are formed by complete reaction with 33.7 grams of limestone? What is the volume of CO2 at STP?
To hoist himself into a tree, a 67.5-kg man ties one end of a nylon rope around his waist and throws the other end over a branch of the tree. He then pulls downward on the free end of the rope with
Discuss toxicity and the factors that modify toxic responses. Also, incorporate the following: absorption, access to target cell, degree of biotransformation or bioactivation, and rate of eliminati
If 200ml of 2.00M HCL solution is added to 400ml of 1.00M NaOH solution What molarity will the resulting solution NaCl have.
The driver of a 1800 {rm kg} car traveling on a horizontal road at 100 {rm km}/{rm h} suddenly applies the brakes. Due to a slippery pavement, the friction of the road on the tires of the car, which
An experiment shows that a 113 mL gas sample has a mass of 0.171 g at a pressure of 721 mmHg and a temperature of 32 C. Identify the gas
Complete and balance the following redox reaction reaction under basic conditions: PO3^3-(aq)+ MnO4^-(aq)→ PO4^3-(aq)+ MnO2(s)
A block with mass m = 20.4 kg slides down an inclined plane of slope angle 17.8 o with a constant velocity. It is then projected up the same plane with an initial speed 4.35 m/s. While the mass is h