Naturally occurring rubidium consists of about 73.2% rubidium-85 (atomic mass 84.9 u) and 27.8% rubidium-87 (atomic mass 86.9 u). calculate the average atomic mass of rubidium rounding your answer to 0.1 u

Identify the correct charge of each atomic particle A. Electron=positive; proton=negative; neutron=no charge B. Electron=negative; proton=positive; neutron=no charge C. Electron=no charge; proton=negative; neutron=positive D.

Tartaric acid, h2c4h4o6, has two acidic hydrogens. the acid is often present in wines and precipitates from solution as the wine ages. a solution containing an unknown concentration of the acid is titrated with naoh. it requires 21.65 ml of 0.

For the reaction 2 NH 3 (g) - ⇀ ↽ - 3 H 2 (g) + N 2 (g) 2NH3 (g) ↽--⇀ 3H2 (g) + N2 (g) the equilibrium concentrations were found to be [ NH 3 ] = 0.250 M [NH3]=0.250 M, [ H 2 ] = 0.440 M [H2]=0.440 M, and [ N 2 ] = 0.800 M [N2]=0.800 M.

What is the pOH of a 0.025 M [H+] solution?

If the temperature changes in a chemical reaction, what has occured? A) energy was destroyed B) energy was created C) there was no energy transfer D) energy was transferred

What two quantities are conserved in every chemical reaction? a. moles and mass c. volume and mass b. mass and atoms d. moles and atoms?

What two chemical mechanisms change pyruvate to acetyl-CoA in the pyruvate dehydrogenase complex? Group of answer choices a) Decarboxylation and condensation. b) Oxidation and decarboxylation. c) Condensation and dehydrogenation.

Which earth cycle does the suns energy drive

How many moles are in 10 grams of CaCl2?

Which is the correct formula for phosphorus pentachloride? PCl4 because a subscript of 4 indicates four Cl atoms PCl5 because a subscript of 5 indicates five Cl atoms P5Cl because a subscript of 5 indicates five P atoms P5Cl3 because a subscript of