4. the number that indicates the number of protons in the atoms

How much heat is required to increase the temperature of 198.5 grams of water from 25.0 degrees Celsius

What is corrosion? what is corrosion of iron called?

Compare the wavelengths of an electron (mass = 9.11 * 10-31 kg) and a proton (mass = 1.67 * 10-27 kg), each having (a) a speed of 8.83 * 106 m/s and (b) a kinetic energy of 7.81 * 10-15 J. Enter your answers in scientific notation.

What do scientists use to determine what the interior of a moon is like?

What is the product of a substitution reaction if the reactants are fluoroethane and sodium hydroxide?

NaOH+HCl--> NaCl+H2O what is the total number of grams of H2O produced when 116 grams of the product, NaCl, is formed?

Is a sample of liquid nitrogen more dense than a sample of nitrogen gas

You have a balloon containing 1 L of air at STP in a vacuum chamber. What will the volume of the balloon be when you reduce the pressure by half and increase the temperature to 373 K?

Which method will correctly determine whether the forces on an object are balanced or unbalanced? A. Multiply the forces in the horizontal direction by the forces in the vertical direction. B.

Carbon is found in all known forms of life. Which statement best describes why carbon is uniquely suited to forming macromolecules such as those found in living organisms? A. Carbon forms large compounds that are not chemically reactive. B.