Which term describes the sum of the number of protons and neutrons in an atom?

How many grams of ammonia would be formed from the complete reaction of 4.50 moles hydrogen

What is the molarity of a solution that contains 125 g nacl in 4.00 l solution?

g Ethylene is a hormone that promotes the ripening of fruit. What happens in the absence of ethylene?

There are 43.2 g of carbon to 14.4 g of hydrogen in a sample of methane (CH4). What percent of 37.8 g of methane is carbon?

How many people in the United states depend on groundwater

Select the correct answer. In the graph, what effect would adding a catalyst have on D? A. It would decrease. B. It would increase. C. It would stay the same. D. You cannot tell from this graph.

Estimate the heat of neutralization of H3PO4 in kJ/mol given these dаta: Heat transferred = 2.5 x 102 J Moles of H3PO4 = 1.4 x 10-3 mol Moles of NaOH = 5.0 x 10-3 mol

Consider the elemts Ca, Ba, As, and Bi. Which has the ... largest radius? highest electronegativtity? Highest Ionization Energy?

How do guys Make sperm?

Maya's playroom is 12 m2. The length of the room is 3 m. What is the width? 4 m 8 m 15 m 36 m