Which of the following statements is true about catalysts? and why?

a. catalysts slow down the rate of chemical reactions
b. all catalysts are enzymes
c. catalysts are used up during a chemical reaction
d. catalysts lower the activation energy of a chemical reaction

What is the value of keq for the reaction expressed in scientific notation?

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these