You give a sample containing .90 moles of a substance

a) how many atoms are in the sample if the substance is copper

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

How have the greenhouse gasses increased from the year 2000 to 2018

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?