Select all that apply: the melting points of organic compounds are usually lower than those of inorganic compounds. the boiling points of organic compounds are usually lower than those of inorganic compounds. the flammability of organic compounds is usually lower than that of inorganic compounds.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?