Which of the following is true of the three isotopes? oxygen-16, oxygen-17, oxygen-18 * they have a different number of protons. they have the same atomic mass. they have a different number of electrons. they have different number of neutrons.

How are isotopes of the same chemical element alike? how are they different?

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

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