TRUE OR FALSE - during all chemical reactions, the mass of the products is never equal to the mass of the reactants
- Mass is sometimes lost in chemical reactions
- The Law of Conservation of Mass states that mass is not conserved

Which of the following is a compound? a. carbon b. oxygen c. hydrogen d. water

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

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