Which can change place when a undergoes a chemical change?

Identify each part of this chemical equation, which describes the breakdown of water into Hydrogen and oxygen

A pure substance where atoms of two or more elements are chemically bonded to one another

5. You have 100 kg of gas of the following composition: CH4 - 30% H2 - 10% N2 - 60% What is the average molecular weight of this gas?

OS-182 has a half-life of 3.6 days. If a sample started at 175 grams, how much would be led after 18 days? A. 35.0 grams B. 2.70 grams C. 110.2 grams D. 5.47 grams

How do you do double replacement reactions?

The composition of air by volume is approximately 1/5 oxygen, 4/5 nitrogen. When air is passed through red-hot carbon, the following reaction occurs: 2C + O2 (g) 2CO (g).

How many atomic mass units are equal to 1.672*10-24 g of protons?

What is the name of the compound Sr3N2?

The water softener discussed here relies on precipitation softening also known as ion exchange. based o hte reactants used, what ions would remain in the softened water thaat would be consumed buy the homeowners

What would be the best technique to separate a soluble solid from a solution, like separating salt from a mixture of salt water?