1. How many protons does 14/6 C contain? What element is this?

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

How do dying stars contribute to the formation of planets

The msds for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. it reacts with bases, various metals, and strong oxidizing agents. its vapors can form explosive mixtures with air.