Im found only in plant cells im as green as can be i make food for the plant using the suns energy what am i?

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.