When measuring radioactive things why is it important not to change the distance between the shielded readings and the unshielded readings?

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

Why dose heating increase the speed at which a solution dissolved in water

Why are enzymes important to cells? they bring about chemical reactions. they provide structural support. they form the two layers of membranes. they store large quantities of energy.