Technetium-99 is used for brain scans. If a Laboratory receives a shipment of 200 g of this isotope, how much will remain after 24 hours? The Half-Life of

Technetium-99 is 6 hours.

During which stage of the water cycle could water enter the atmosphere as a gas? A. transpiration B. precipitation C. accumulation D. condensation

Two of the liquids, n-pentane and 1-butanol, had nearly the same molecular weights, but significantly different ∆t values. explain the difference in ∆t values of these substances, based on their intermolecular forces.

Which statement describes a change that occurs during a chemical reaction? A. Atoms in the original substances are changed into different atoms to make new substances. B.

Describe in detail, the Maillard Reaction.

What percentage of solar radiation striking a plant is converted into chemical energy?

Calculate the molar mass of NH4NO3.

Thirty grams of lead oxide and fifteen grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products? 10 g 15 g 45 g 450 g

The smallest unit of charge is - 1.6*10-19 C, which is the charge in coulombs of a single electron. Robert Millikan was able to measure the charge on small droplets of oil by suspending them between a pair of electrically charged plates.

An unknown material has a mass of 5 g and a volume of 7.25 cm3. What is the density of the material? Round to the nearest tenth.

How can light be emitted from an atom in ground state