Which of the following statements related to a mole are true? Select all that apply.

A. A mole is used to simplify the counting of atoms.

B. Representative particles can only be atoms.

C. A mole is used to simplify the counting of electrons.

D. Representative particles can be atoms, molecules, or formula units.

E. The number of representative particles in a mole (6.02 x 1023) is called Avogadro's number

Express the following number in scientific notation. 0.026890 =

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.

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next