What is the charge of an ion that contains 21 protons and 19 electrons?

How do you balance C2H2 + O2 - > CO2 + H2O? Is it C2H2 + 5/2 O2 - > 2CO2 + H2O or 2C2H2 + 5O2 - > 4CO2 + 2H2O?

An isotope of cesium (cesium-137) has a half-life of 30 years if 1.0g of cesium-137 disintegrates over a period of 90 years how many g of celsium-137 would remain

What are the three heredity rules?

What clues indicate a rusty bike has gone through a chemical change

How can I differentiate between Ionic compounds, molecular compounds, and acids given only the formula?

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Identify and briefly describe two ecosystems in your community that are beyond schoolyard

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.