Which describes why radioisotopes can be used as tracers in studying the biological and chemical processes of plants?
a-the radioisotope is chemically identical to the nonradioisotope the plant normally uses.
b-the radioisotope is absorbed more quickly than the nonradioisotope the plant normally uses.
c-the radioisotope converts the nonradioisotope normally used by a plant into a radioisotope.
d-the radioisotope travels through the plant without participating in any chemical processes.

What is hidden during a lunar eclipse? isn't the moon hidden?

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?