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Phosphorus-32 has a half-life of 14.0 days. Starting with 4.00g of 32P, how many grams will remain after 42.0days ?
What volume of 0.105 M lead(II) nitrate is required to react with 100.0 mL of 0.120 M potassium chromate? What mass of PbCrO4 solid forms?
When a certain force is applied to the standard body its acceleration is 5.00 m/s2. When the same force is applied to another object its acceleration is 1/3.33 as much. The mass of the object is ??
The temperature of the water in this pool increases by 2.00? C when it is heated by the Sun for 6.00 hours. Calculate the energy absorbed.
A horse canters away from its trainer in a straight line, moving 118 away in 15.1s . It then turns abruptly and gallops halfway back in 5.0s. Calculate its average speed for the entire trip.
A superball with mass equal to 50 grams is dropped from a height of . It collides with a table, then bounces up to a height of. The duration of the collision (the time during which the superball is
Explain whether this process violates the second law of thermodynamics or not. Make a quantitative argument to support your answer.
Sam, whose mass is 79.0 , takes off down a 52.0 high, 8.00 slope on his jet-powered skis. The skis have a thrust of 220 . Sam's speed at the bottom is 45.0 . What is the coefficient of kinetic frict
The standard heat of formation for H2O(g) is -241.8 kJ/mol, and for NaOH(s) it is -425.6 kJ/mol. What is the enthalpy change for the reaction between Na(s) and H2O(g) to produce NaOH(s) and H2(g) pe
Exerting a force of 84 N on the circular piston of a syringe causes a pressure increase in the barrel of 1.3 atm. What is the diameter of the piston?
Explain and talk about the global warming thats taking place, including talks about the current climate change and what is the increase in rate of change and how does it affect the population?
The position of a particle moving along the x axis is given in centimeters by x = 5.50 + 2.50t^3, where t is in seconds. Consider the time interval t = 2.00 s to t = 3.00 s.
In a diesel engine, the piston compresses air at 306 K to a volume that is 0.0622 of the original volume and a pressure that is 48.2 times the original pressure. What is the temperature of the air
When a 6.00-g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 6.019 kJ·K-1, the temperature decreases by 0.230 K. Calculate the molar heat of solution o
61.0 mL of a 1.40 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 187 mL of water. What is the final concentration? Assume the volumes are a
A blacksmith heats a 1.9 iron horseshoe to 460, then plunges it into a bucket containing 20 of water at 19. What is the final temperature?
On a very muddy football field, a 120 kg linebacker tackles an 75 kg halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.6 m/s north and the halfback is slidi
If the simulation does not give a precise quantitative reflection of Graham's Law, what could be done to improve the quantitative estimate of the simulation?
An aqueous solution contains 10% ammonium by mass and has a density 0.99 gcm-3 . Calculate hydroxyl and hydrogen ion concentration in this solution. if Ka for ammonium ion = 5.0 x 10^-10.
What is the elastic potential energy of the system when the 2.0-kg block is replaced by a 4.1-kg block?
A 67.0 kg base runner begins his slide into second base when moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just
A 47.0- person takes a nap in a backyard hammock. Both ropes supporting the hammock are at an angle of 16.0 above the horizontal. Find the tension in the ropes.
A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.00, the resistance of the carbon resistor is 217.4 . What is the temperature on a spring day when the resi
What was the final temperature of the gold if the initial temperature was 22.0°C? The specific heat of gold is 0.129 J/(g·°C).
15.0 moles of gas are in a 8.00L tank at 24.6°C . Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300L2