is the amount of matter in an object and is measured in kilograms. A. Mass
B. Gravity
C. Newton
D. Weight

Which of the following is an oxidation-reduction reaction? (pictured below)

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

What are the characteristics of carbon bonds? check all that apply.