2. An element's atomic number is the A. number of protons in an atom's nucleus. B. mass of the atom. C. weight of the atom. D. sum of the protons and neutrons in an atom.

What is the mass of a 2.00 cm3 peice of balsa wood having a density of 0.160 g/cm3

Which process, nuclear fusion or nuclear fission, creates more energy?

Lead (ii) nitrate and ammonium iodide react to form lead (ii) iodide and ammonium nitrate according to the reaction pb (no3) 2 (aq) + 2nh4i (aq) ⟶pbi2 (s) + 2nh4no3 (aq) what volume of a 0.610 m nh4i solution is required to react with 229 ml of a 0.

A 50 g piece of aluminum is heated to 800c and then dropped into cold water, where the metal's temperature drops to 300c. how many calories does it lose to water? (specific heat capacity of aluminum is. 21 cal/g0c)

Explain the energy transformation that must occur for your body to participate in a physical activity, such as playing a sport.

Which stament best describes a solution

Which answer accurately describes the difference between speed and velocity? Read each answer choice carefully. Question 4 options: A. If speed is constant, then velocity is also constant. B. Speed requires direction.

Least reactive element of period 3

A chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension

What gas was used as a deadly posiosn in world war 1?