ATI TEAS 7 PRACTICE QUESTIONS AND ANSWERS.

1) Chemical bonding – a. Uses electrons that are closest to the nucleus of the atoms bonding b. Always uses electrons from only of the atoms involved c. Uses all the electrons in all atoms involved d. Uses the valence electrons of all the atoms involved 2) Which of the following would have the most dramatic effect in changing the reaction rate? a. Decreasing the temperature by two-fold b. Increasing the pressure by two-fold c. Decreasing the activation energy by three-fold d. Decreasing the concentration of reactants by two-fold 3) Group one in the periodic table has valence electrons and is reactive than Group two. a. Zero; more b. Zero; less c. One; less d. One; more 4) Enzymes are created from amino acid chains. As such, what might prevent the action of an enzyme? a. A pH close to 7 b. A high temperature c. The lack of hydrogen ions in solution d. A lack of ATP in the cell 5) If a scientists want to determine the rate at which an enzyme works, what could he or she measure? a. The rate at which the enzyme is degraded