The sum of the protons and neutrons in an atom is its

A. charge.

B. atomic energy.

C. atomic mass.

A chemist determines by measurements that 0.0200 moles of iodine solid participate in a chemical reaction. Calculate the mass of iodine solid that participates. Round your answer to 3 significant digits. $ x 6?

Celery stalks immersed in a 0.2 M solution of NaCl for 3 hours become limp and soft. Similar celery stalks immersed in fresh water for 3 hours become stiff and hard. What can be deduced about the celery cells based on this information?

What happens to the pressure of a gas if the volume of gas is tripled at a constant temperature?

Which part of the mantle is similar to the crust? (science Earth's Layers)

Which of these accurately describes Newton's third law? "The relationship among mass, acceleration and net force." "The stronger the net force acting upon an object, the greater the acceleration of the object.

How many valence electrons are in each atom?

77.60 ml of. 210 M NaOH are required to neutralize 25.05 ml ofH2SO4 solution in a titrationexperiment. Calculate the molarity and normality of theH2SO4 solution.

A 25.0 g bold made of an alloy absorbed 250 J of heat as its temperature changed from 25.0 °C to 78.0 °C. What is the specific heat of the alloy?

How is an areas topography determined?

How to put a solution back into solution when it comes out of solution chemistry?