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1. Can the terms ‘mass' and ‘weight' be used interchangeably - explain.
2. Complete the following questions about nuclear radiation.a) Discuss four vital factors that should be used in minimising the effects of radiation.
b) What is most effective shielding that can be used for protection from the following radiation types?
• alpha particles• beta particles• gamma rays
calculate the number or calories of heat energy required for warming 34.6g of water from 18.9 celsius to 29.9
only hydrogen gas would be left as a product b. the equilibrium would shift to the left c. the equilibrium would shift to the right d. the equilibrium would remain unchanged
The second is defined as a fractional part of a mean solar day. Express one second as a fraction of a mean solar day based on your knowledge that there are 60 s in 1 min, 60 min in 1 h, and 24 h in one mean solar day.
If you had excess chlorine, how many moles of aluminum chloride could be produced from 15.0g of aluminum
What is the percent-yield of H2 in the reaction below when an equimolar mixture of CH4 and CO2 with an initial total pressure of 20.0 atm reaches equilibrium at 1200. K, at which Kp = 3.548 x 106
platinum crystallizes with a face-centered cubic unit cell. the radius of a platinum atom is 139 pm. calculate the
a 0.336 gram sample of sodium carbonate required 28.6ml of a sulfuric acid solution to reach the endpoint for the reaction Na2CO3 +
Consider a 53.5 g sample of H2O(g) at 117°C. What phase or phases are present when 134 kJ of energy is removed from this sample.
A sample of propane,C3H8 , contains 18.0 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen numerically.
Tris base (pka =8.1 ; ka = 8.32 e-9) was dissolved in 0.5l of water to give the final concentration of 1 M. a.) find pH of the obtained solution. b.) how much does the pH change after addition of 1 ml of 10N HCl?
A stock solution of lactic acid is 0.04M and a stock solution of lactate is 0.25M. Calculate the pKa of lactic acid given that at these concentrations the pH is 3.90
A student breaks a thermometer and spills mercury onto the floor of a lab that measures 6.1 m x 5.3 m x 3.1 m. What is the mass of mercury in grams that is vaporized at equilibrium AND what is the concentration of mercury in mg/m3
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