A sample of iron absorbs 67.5 J of heat, upon which the temperature of the sample increases from 21.5ºC to 28.5 ºC. If the specific heat of iron is 0.450 J/g-K, what is the mass of the sample?

What is the maximum number of electrons that can be contained in the subshell pictured below?

When an electrical spark is applied to sodium azide (NaN3) in an automobile air bag, the NaN3 is rapidly converted into elemental sodium and nitrogen gas. What type of reaction is this?

The temperature of a 15 g sample of lead metal increases from 22 ºC to 37 ºC upon the addition of 29.0 J of heat. What is the specific heat of lead (in J/g-K)?

Which electron box diagram below represents a ground state nitrogen atom

Which electron box diagram below represents an oxygen atom that has absorbed a photon of light?

Which of the following transitions is expected to result from absorption of the longest wavelength of EM radiation?

Which of the following elements has a ground state electron configuration of   4s1 3d5 ?

When NH3 is added to water, the following process occurs: NH3 (aq) + H2O (l)

When HCN is added to water, the following reaction occurs: HCN (aq) + H2O (l)