What should u look for when identifying a chemical change. Select 3 that all apply. A. The shape changes. B. the color changes . C. the size changes. D light or heat is produced. E. new substances are created . F. the state if matter changes .

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Compare and contrast the bohr model and the electron cloud models of the atom.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.