A positive two ion of calcium Ca+2, would have how many protons, electrons and neutrons

1. What is the pH of a solution if the [OH-] = 4.0x10-11M?

What is the process by which organic matter breaks down to become part of the soil?

Consider the chemical equation. 2NBr3 + 3NaOH - - > N2 + 3NaBr + 3HOBr If there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant? N2 NBr3 NaOH HOBr

Determine the volume (in L) of Cl2 (g) required to carry out the following reaction at 794 torr and 625°C using 15.0 g of Fe. The value of R = 0.0821 L atm mol-1 K-1. 2Fe (s) + 3Cl2 (g) = 2FeCl3 (s)

Will sodium lose 6 electrons or gain 2?

Which of the following is a part of a land based carbon cycle? coral reefs Crab shells Trees Whales

What is common of volcanoes that have the most violent eruptions? A. They feature magma with very high silica content. B. They are shield volcanoes. C. They feature magma with low viscosity. D. They have no magma, but have much lava.

Why is nitrogen fixation such an important step in the nitrogen cycle? Question 7 options: Bacteria convert the fixed nitrogen back into N2. Soil nitrogen is different. Decomposers need to use NH4+. Plants can't use nitrogen in the form of N2.

At 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa s-1 when 10.0 per cent had reacted and 7.67 Pa s-1 when 20.0 percent had reacted. Determine the order of the reaction.

What particles are used to form bonds