When do elements absorb energy and enter an excited state?

Limiting Reactant For the general reaction stoichiometry of 2A + 3B → D+E, which reactant is the limiting reactant (A or B), if the initial number of moles is 3 moles of A and 4 moles of B?

A doctor needs to know how the chemicals in a medicine will dissolve in water. what property of matter does the doctor need to look up?

Carbon-14 dating could be used to estimate the age of all of the following except A. fossils b. ancient scrolls c. petrified wood d. artifacts from the titanic ship

For the reaction A + B - ⇀ ↽ - C + D, assume that the standard change in free energy has a positive value. Changing the conditions of the reaction can alter the value of the change in free energy (Δ G).

199.5 grams unrefined dark crystalline sugar to cups

The subatomic particle that has the least mass is the ...

Which two properties are used to define matter? has mass and conducts heat has buoyancy and volume has mass and takes up space conducts energy and has characteristic properties

Calculate the energy if 48.7 g of Al reacts in the following reaction. (Al = 26.98 g/mol) Fe2O3 (s) + 2 Al (s) →Al2O3 (s) + 2Fe (s) ∆Hrxn = - 852 kJ.

Which type of wave has a wave perpendicular to the disturbance? Surface Longitudinal Mechanical Tranverse

Caffeine's molecular formula is c8h10n4o2. the molar mass of caffeine is 194g/mol. what is the percentage of carbon in caffeine