What equals the number of protons in an atom

How much 8 grams will weigh after a physical change

students who wrote about their thoughts before a test outperformed students who did not. What is the explanation for these results?

Calculate the amount of heat (kcal) released when 50.0g of steam at 100*c hits the skin, condenses, and cools to a body temperature of 37*c

What is the difference between instantaneous velocity and average velocity

A satellite orbits the earth at a distance of 1.50 * 10^{7} m above the planetʹs surface and takes 8.65 hours for each revolution about the earth. The earthʹs radius is 6.38 * 10^{6} m. The acceleration of this satellite is closest to

Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged. B) It gains protons and becomes positively charged. C) The number of positive and negative charges can be the same. D) It has to be a metal.

Define the law of conservation of momentum in one sentence

A shopping cart rolls from x=19.9m to x=5.40m with an average velocity of - 0.418m/s. How much time did it take? (unit=s)

Where does the energy of a nuclear power plant come from?

When the vapor pressure of a liquid is equal to the atmospheric pressure the liquid?