The atomic number of re is 75. the atomic mass of one of its isotopes is 186. how many neutrons are in an atom of this isotope?

a. 186

b. 111

c. 261

d. 75

Identify the information that can be included in a chemical equation.

Ann propped up a graham cracker in a shallow bowl. She then set up an electric fan to blow on the graham cracker at three different speeds. what is anns dependent variable in this experiment?

Zn + HCI - ZnCl2 + H2 A. What is my theoretical yield of H2 if I start with 74 g of HCI? B. If my percent yield was 93%, what was my actual yield?

In which direction is there a net force of 200 North

What is the maximum mass of s8 that can be produced by combining 87.0 g of each reactant? 8so2+16h2s=3s8+16h20?

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?

What are the two main classifications of energy resources?

A liquid is heated and a solid forms at the bottom of the beaker. Is this a physical or chemical change?

How to predict the formula of an ionic compound based on the charges of the ions?

Which of the following kingdoms in one-celled organisms