If the atomic number is 3 and the mass number is 7 what is the number of protons

The density of a liquid can be found by using what tool?

A sample of Xe takes 75 seconds to effuse out of a container. An unknown gas takes 60 seconds to effuse out of the identical container under identical conditions.

A small diamond, which is made of pure carbon, contains too many carbon atoms to count individually. Which is closest to the number of carbon atoms in a 1.0-g diamond? Disabled A. 3.6 x 10-45 carbon atoms Student Selected Incorrect B. 9.

What is the pH of KOH solution that has H + = 1.87 x10^-13

A 5.00 L evacuated flask is filled with 1.86 moles NOBr. After equilibrium is established at 298 K, it is found that there are 0.082 moles of bromine gas present. Determine Kc and amp for the reaction.

Suppose 0.274 mol of a gas occupy 6.62 l at a given temperature and pressure. what volume will 0.878 mol occupy at the same temperature and pressure?

Peter and Jessica are both forensic scientists. Peter visits crime scenes to pr the evidence collected by Peter.

1. Mitch weighs out 67 grams of potassium (K) to make a buffer. How many moles of potassium did Dr. Hellman weigh out? 2.

9,000,000 in scientific notation

Ozone layer depletion causes