4 Questions

1.If the half-life of a specific radioisotope is 7.2 days, how much activity would remain after 36 days?

2.How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?

3.What mass of water will change it’s temperature by 3 degrees C when 525 J of heat is added to it?

4.A piece of ice at 0 OC and weighting 35 g is added to a beaker of water at 18.0 OC. All the ice melts, and the temperature of the water in the beaker decreases to 12.0 OC.

How many grams of water were in the beaker (i.e., the initial volume of water in beaker)?