In a chemical reaction in a living system, enzymes are used as catalysts. which of the following statements about enzymes is incorrect? a. enzymes increase the energy of activation necessary for a chemical reaction to go forward. b. enzymes enter reactions and can be reused. c. enzymes reduce the energy of activation necessary for a chemical reaction to go forward. d. enzymes are sometimes referred to as biological catalysts; however, not all biological catalysts are proteins. e. enzymes speed up chemical reactions in living systems.

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

Do plant cells perform cellular respiration?

Which state of matter has the following physical properties: ~ takes the shape of the container it is in ~ takes the volume of the container it is in ~ low density. answer is gas