How many electrons and protons are contained in an atom of arsenic

How many milliliter of a solution of 4.00KI are needed to prepare 250.0mL of 0.760 KI

Pure water has a pH of 7.0. What must be the concentration of hydrogen ions in pure water? 1 * 10^-14 M 1 * 10^-7 M 1 * 10^7 M 1 * 10^14 M

The energy needed for the changes in the water cycle to take place comes from A: Wind B: Green Plants C: Nitrogen D: The sun

O2 + CS2 → CO2 + SO2 Which of the following shows the equation balanced?

The specific heat of a certain type of metal is 0.128J / (g.°C). What is the final temperature if 305 J of hear is added to 28.8 g of this metal, initially at 20.0°C?

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?

Which microscope came out first

Which exerts greater pressure on the floor-standing flat-footed or standing on tiptoe? on tiptoe, because the force acts over less area on tiptoe, because the force acts over more area flat-footed, because the force acts over more area flat-footed,

1. Sara tells Michael she is 160 centimeters tall, while Michael says he is 60 inches tall. If there are 2.54 centimeters in an inch, who is taller