The gas in the ozonosphere that absorbs most of the ultraviolet rays from the sun is the___. Oxygen Nitrogen Ozone. Carbon dioxide.

A sample containing 0.213g Cl - is dissolved in 50.0ml of water how many moles of Cl - are in the solution?

Is boiling water a chemical or physical change? Why?

Why was the constitution made? who wrote it and what compromises did people clime to?

How many grams of sodium oxide can be produced when 55.3 g Na react with 64.3 g O2? Unbalanced equation: Na + O2 → Na2O Show, or explain, all of your work along with the final answer.

Consider hydrogen atom in an excited state of 3s1. What is the energy of its electron

The laws surrounding the motion of planets in our solar system can be replaced by new laws describe what happens in nature under certain conditions prove that theories on space are non-testable can be used to prove that theories on gravity are

Q. 1 What is one joule work?

Identify each of the following equations as which type of chemical reaction? C12 + Nal - - NaCL + 12

Give some examples of pure chemical substances. give some examples of pure chemical substances. gasoline soda water and brass bronze and brass sugar, carbon dioxide, and water

The winner of a 10 km road race took half an hour to complete the race. Calculate her average speed. Give your answer in metres per second.