The half-life for the alpha decay of24 bk to form24am is 1.40x10 y. suppose the energy of the alpha particle is 5.61 mev and that 1.05 g ofbk, freed of any other radioactive materials, were placed in a calorimeter containing 11.9 g of water, initially at 24.5°c. calculate the temperature the water would reach after 1.13 hour. neglect the heat capacity of the calorimeter and heat loss-to the surroundings. take the specific heat of water to be 4.184 j k g and the mass of a bk atom to be 247.070 u. (1 ev 1.6022 x 1019 j) °c

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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