What is the difference between mass number and atomic number

Describe the process used to find the volume of a rectangular solid.

Why are standards needed for measured quantities?

The mass of the sun is 2 x 10 (30) kg, and the distance between Neptune and sun is 30 AU. What is the orbital period of Neptune in earth years

Given the following information, identify which of these are the same element. Be sure to explain your answer. Element 1: 6 protons, 6 neutrons, 6 electrons Element 2: 7 protons, 6 neutrons, 7 electrons Element 3: 6 protons, 7 neutrons, 7 electrons

What is the difference between a mixture and a solution? Is salt water a mixture or a solution?

Consider the following equation. 2H2 (g) + O2 (g) 2H2O (g); ΔH is negative. Which statement is true? The reaction is endothermic from left to right. Increased pressure would increase the rate of forming water vapor.

Ions form when atoms gain or lose protons. True or False.

In which of the following aqueous solutions would you expect AgI to have the highest solubility? In which of the following aqueous solutions would you expect AgI to have the highest solubility? 0.038 M NaI 0.050 M AgNO3 0.025 M KI 0.

If the passing of five half-lives leaves 25 mg of a strontium-90 sample, how much was present in the beginning?

Which part of the body does colchicine affect the most