Do the relative proportions of elements in a given compound vary from sample to sample?

Historically, the medical consequence suffered by consumers exposed to lead is A.) Stunted growth B.) infection C.) rashes D.) brain damage

True or false silica is the most abundant compound found in magma.

Abby mixes 2 moles hydrogen with 1 mole oxygen to produce water. She expects to produce 2 moles water, but she captures 1.5 moles water. In this case, the value 1.5 moles represents which type of yield?

Mass defect for oxygen-16 = 0.13261 amu How many kilograms does the mass defect represent? 1.66 * 10-27 kg 2.20 * 10 - 28 kg 3.0 * 108 kg 8.24 x 1025 kg

The cell membrane responds to chemical signals from other cells A) true B) false

Fish need at least 4 ppm dissolved o2 for survival. part a what is this concentration in mol/l?

How does a runoff get polluted.

Anatom that has lewer neutrons than protons and more electrons than protons is

Which can have either a positive charge or a negative charge when they are released during radioactive decay? A. alpha particles B. beta particles C. positrons D. photons

Which ionic compound is water soluble? A. cuS B. NH4NO3 C. SrSO4 D. ZnF