How many mg of a 31-mg sample of calciul 47 remains after 45 days

Aqueous aluminum bromide and solid zinc are produced by the reaction of solid aluminum and aqueous zinc bromide. write a balanced chemical equation for this reaction.

About 20-25% of the 92 natural elements are known to be essential to life. which four of these elements make up approximately 96% of living matter? a. carbon, sodium, hydrogen, nitrogen b. carbon, oxygen, phosphorus, hydrogen c.

Why are the elements in groups 3 to 12 known as tranition elements

Calculate the maximum mass of carbon dioxide that could be obtained by adding excess hydrochloric acid to 15 g of calcium carbonate.

How many compounds are in a wooden block

Which of the following lines (of latitude or longitude) would represent by 180 longitude? South Pole Equator Prime meridian North Pole International date line

63Ni decays by a first-order process via the emission of a beta particle. The 63Ni isotope has a half-life of 100. years. How long will it take for 65% of the nickel to undergo decay?

Based on the standard free energies of formation, which of the following reactions represent a feasible way to synthesize the product? A. 2C (s) + H2 (g) →C2H2 (g); ΔG∘f=209.2 kJ/molB. N2 (g) + 3H2 (g) →2NH3 (g); ΔG∘f=-33.30 kJ/molC.

How do I find the molar mass of Copper (II) Nitrate?

Describe several main ideas in chemistry