Zirconium has an atomic number of 40 and an atomic mass of 91. How many neutrons does it have? A. 40 B. 51 C. 91 D. 131

Using the Arrhenius concept of acids and bases, identify the Arrhenius acid and base in each of the following reactions: 2KOH (aq) + H2SO4 (aq) →K2SO4 (aq) + 2H2O (l) CH3NH2 (g) + HBr (g) →CH3NH3Br (s)

For a free falling object weighing 3kg, what is the object's velocity 2 s after its release?

The formula for getting the molar mass of an element

Uranium can be isolated from its Ores by dissolving it as UO2 (NO3) 2, then separating If as solid UO2 (C2O4).3H2O. Addition of 0.4031 gram of Sodium Oxalate, NaC2O4, to a solution containing 1.481 gram of uranyl nitrate, UO2 (NO2) 2, yields 1.

For clouds to form, water vapor in the air must condense and change from a gas to a liquid. What must water molecules do as part of this process?

Blanking and Punching size:A compound die will be used to blank and punch a large washer out of 6061ST aluminum alloy sheet stock 3.80 mm thick. The outside diameter of the washer is 60.0 mm and the inside diameter is 28.0 mm.

Whats the difference between china and Europe

Iodine pentafluoride gas reacts with iodine fluoride gas producing iodine heptafluoride gas and iodine gas. What is the maximum number of grams of iodine gas that can be produced from a reaction of 10.0 g of iodine pentafluoride with 11.

What evidence of a chemical reaction might you see in dropping an Alka-Seltzer tablet into a glass of water?

State hess's law. how is it used