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When lithium nitride, Li3N(s), is treated with water, H2O(l), ammonia, NH3(g), is produced. Predict the formula of the gas produced when sodium phosphide, Na3P(s), is treated with water.
A soccer ball is kicked at an angle of 30 degrees at 10 m/s from ground level. What are the horizontal and vertical components of its initial velocity?
Calcium carbide, CaC2 reacts with water to form acetylene. How many grams of water are needed to react with 485g of calcium carbide?
Oxygen makes up 46.7(%) by mass of Earth's crust. How many grams of oxygen are present if a sample of Earth's crust has a mass of 328 g ?
When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track.
Show that the time rate of change of mechanical energy for a damped, undriven oscillator is given by dE/dt = -bv^2 and hence is always negative. To do so, differentiate the expression for the mecha
When you pull horizontally on a crate with a force of 330 N, it slides across the floor in dynamic equilibrium. How much friction acts on the crate?
What is the theoretical yield of bromobenzene in this reaction when 30.0 g of benzene reacts with 65.0 g of bromine?
A cylinder with a moveable piston contains 0.90 of gas and has a volume of 329. What will its volume be if an additional 0.17 of gas is added to the cylinder?
An 800 N gorilla swings from vine to vine. As the gorilla grabs a new vine, both vines form an angle of 30o with the vertical. What is the net force on each vine?
A toy car runs off the edge of a table that is h = 1.150 m high. The car lands d = 0.425 m from the base of the table. How fast was the car going on the table?
A 21.2 mL sample of a weak monoprotic acid, HX, requires 50.0 mL of 0.045 M NaOH to reach the equivalence point. After the addition of 30.0 mL of NaOH, the pH is 4.90. What is the Ka of HX?
When a 124 N bag of nails hangs motionless from a single vertical strand of rope, how much tension is exerted in the strand?
Mary weighs 475 N and she walks down a flight of stairs to a level 5.00 m below her starting point. What is the change in Mary's potential energy
An 9.0 m, 200 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50.0° angle with the ground. How
Assume that the kinetic energy of a 1100{rm kg} car moving at 125{rm km/h} could be converted entirely into heat. What amount of water could be heated from 21C to 52C by the car's energy.
A loudspeaker of mass 17.0 {rm kg} is suspended a distance of h = 2.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.70 {rm m}.
When 40 mL 0.600 M NaOH(aq) is added to 100 mL 1.0 M HCl(aq) the temperature rises 1.29 oC. Calculate the molar enthalpy of neutralization, ΔHneutralization(kJ/mol NaOH).
A man is running at speed c (much less than the speed of light) to catch a bus already at a stop. At t=0, when he is a distance b from the door to the bus, the bus starts moving with the positive a
what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the minimum coefficient of friction between tires and road that would keep traffic from skidding out
How much CaCN2 is needed to produce 12.6 moles of NH3 if the percent yield is 65.8%?
Racing drivers like tow arm up the tyres of their car as soon as possible. One reason is that warm tyres grip the road better but the temprature also affects the pressure of the air int he tyres. E
A 5000 kg helicopter accelerates upward at 0.50 m/s2 while lifting a 2000 kg car. What is the lift force exerted by the air on the rotors? What is the tension in the cable that connects the car to t
73.0 mL of a solution is diluted to a volumeof 278 mL. A 139 mL portion of that solution is diluted using 167 mL of water. What is the final concentration.
what minimum ventilation rate (in m3/hr) would be necessary to keep the CO concentration in your garage from the dangerous level of 1600 ppmv.