How many protons, neutrons, and electrons are present in an atom of aluminum-27?

How many U. S. gallons are there in a cubic mile? The total proven oil reserves of the U. S. are roughly 30 x 10°bbl. How many cubic miles is this?

How many significant figures are in the measurement 230 kg?

The attraction between two oppositely charged atoms or group of atoms is which type of bond

Why was it important to have endothermic and exothermic processes in the building materials of your train? a. Which engines released thermal energy in an exothermic reaction? b. Which engines absorbed thermal energy in an endothermic reaction?

2 things that happens to the molecules of water as thermal energy is added

How much water needs to be added to an 18.0 M stock solution of sodium hydroxide in order to make 450.0 mL of 0.250 M sodium hydroxide solution?

The quatum number 1 describes what

The formula is used to calculate the yield of a reaction.

What do you think about our current forms of recycling and why?

A sample of a hydrate has a mass of 5.026 g. After it is heated, it has a mass of 3.492 g. What is the percentage by mass of water in the hydrate? 1. 19.40% 2. 27.92% 3. 30.52% 4. 69.48%