a single atom of an element had 21 neutrons, and 20 electrons, and 20 protons which element is it? K. Zr. Ca. Sc

Which statement is NOT correct concerning 2,3-bisphosphoglycerate (BPG) ? A. It is an allosteric modulator. B. It binds with lower affinity to fetal hemoglobin than to adult hemoglobin. C. It binds at a distance from the heme groups of hemoglobin. D.

Which natural resource is nonrenewable? sugarcane oil or petroleum sunlight corn

Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL; d of Hg = 13.

What is the mass in grams of one mole of He?

The theoretical yield for a reaction is 80 grams. The reaction ends up having a percent yield of 40%. How many grams were actually produced in the reaction? 3.2 g 32 g 50 g 80 g

What are some examples of not all liquid's evaporating at the same rate?

Suppose you went bowling, but instead of a bowling ball you rolled a ping pong ball down the alley. What do you think would happen?

Which expression represents the ΔH for a chemical reaction in terms of the potential energy, PE, of its products and reactants?

Identify the element that has a ground state electronic configuration of [ar]4s23d104p 3.

A geneticist has discovered a new compound that is made up of a small number of identical subunits. The subunits are joined end to end in long chains. Based on this information, what best can be concluded about these subunits? A. They are ketones. B.