soojung

A building has become accidentally contaminated with radioactivity. THe longest lived material in the building is strontium-90 (atomic mass of 90 Sr 38 is 89.9077). If the building initially contained 5.0kg of this subtstance and the safe level is less th...

A wooden artifact is found in an ancient tomb. Its carbon-14 activity is measured to be 60.0% of that in a fresh sample of wood from the same region. Assuming the same amount of carbon-14 was initially present in the wood from which the artifact was made,...

Cells transport substances across their membrane. Choose THREE of the following four types of cellular transport Osmosis Active transport Facilitated diffusion Endo/exocytosis For each of the three transport types you choose, a. Describe the transport pro...

(42.70 + 0.259) / 28.4 I wanted to know, if it 1.510 or 1.51? because it has to be correct sig figs.

The total number of atoms represented by Ca(C2H3O2)2?

A species of clam shows incomplete dominance in the expression of its shell color. RR is the genotype for red shell, Rr is genotype for an orange shell, and rr is the genotype for the yellow shell. Predict the outcome of a cross between an orange shelled...

wait oops xd i forgot rest of problem it was (42.70 + 0.259) / 28.4445 >_< sorry about that