Which of the following is NOT true of a chemical change? 1.Chemical bonds are broken
2.The identity of a substance has changed.
3.The substance has only changed form or appearance
4.It can be indicated by the presence of bubbles or rust

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Is powdered sports drink ionic or covalent ? 10pts !

Scientists often 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 of these numbers in an alternate form.