What is the number after an elements name, representing the sum of its protons and neutrons

An empty erlenmeyer flask weighs 241.3 g. when filled with water (d = 1.00 g/cm3), the flask and its contents weigh 489.1 g. what is the flask's volume? how much does the flask weigh when filled with chloroform (d = 1.48 g/cm3) ?

Why do some atoms gain electrons while others lose them in chemical reactions?

What fuel source is Jan using if she exercises at 85% of her maximum aerobic capacity?

Which law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant? Boyle's law Dalton's law Charles's law Avogadro's law

What is the equation for kinetic energy?

In the teapot dome scandal, what did the secretary of the interior albert fall lease

A Material made of equal parts is called what? A. Atom, B. Pure substance, C. Mixture

Part C Why are dichotomous keys useful in classifying a new species?

2. How is the frequency of a wave determined?

Ammonium acetate chemical formula