Is perfume evaporating on your skin a physical or chemical change?

Do simple molecules conduct electricity? and why?

Determine the oxidation number for nitrogenin each of the following a. NO2 1- b. N2 c. NO2Cl D. N2H4 2. Benzene is a common hydrocarbon, whic his widely used as a solvent. From another experiment, the molecular mass of benzene wasdetermined to be 78.

What is the maximum number of electrons the n = 4 shell can contain?

When two atoms of the same element have different numbers of neutrons and therefore different atomic masses, what are they? a) isotopes b) isomers c) molecules

Which of the following best defines one mole of a substance? A. Mass, in grams, of each particle of the substance. B. Mass, in grams, of the nuclear us of the substance's atoms. C. Amount of substance present in one atom of the substance D.

Justin Bleeber is a lazy young man and decides to burn a pile of leaves instead of bagging it. The pile of leaves weighed three pounds before being burned. After the leaves are burned the leftover ash weighs half a pound.

A diatomic gas has the molar mass 38.00 g/mol. What is a possible formula

Convert 3.5 x 10^23 K atoms to moles 0.58 moles 2.1 x 10^47 moles 5.8 x 10^45 moles 2.5 x 10^23 moles

Describe the composition of a lead storage battery

A 5.0g sample of aluminum with a specific heat of 0.90 j/g was heated from 22.1^c to 32.1^c. How much heat to the nearest joule did the aluminum gain?