Achemistry instructor provides each student with 8 test tubes at the beginning of the year. if there are 28 students per class, how many test tubes are required for three chemistry classes?

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

An unsaturated hydrocarbon is a hydrogen-carbon compound with a. a network solid structure b. single bonds c. single bonds in a branched-chain structure d. double or triple bonds

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron