Which of the following substances is not an
element?
1. carbon monoxide
2. arsenic
3. mercury
4. gold

Blank allows you to do calculations for situations in which only the amount of gas is constant a)boyle's law b)combined gas law c)ideal gas law d)dalton's law

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?