Ch6 Part I: Atoms/Elements/Compounds Multiple choice: Choose one best answer 1. a. b. c. d. The center of the atom contains protons and___________. neutrons that are positively charged neutrons that have no charge electrons that are negatively charged electrons that are positively charged 2. a. b. c. d. Which statement best describes the behavior of electrons? electrons have no charge electrons change energy levels often electrons move in set paths around the nucleus all of these 3. Negatively charged particles found in the outer most energy level of an atom are… a. orbitals b. protons c. valence electrons d. neutral particles 4. a. b. c. d. A substance made up of just one kind of atoms elements compounds molecules none of these 5. a. b. c. d. Two or more different atoms may join together to form… protons elements molecules large atoms 6. a. b. c. d. The overall charge of an atom is…. electrically positive neutral negative unbalanced 7. a. b. c. d. Which particle gives an atom it’s identity? number of electrons number of neutrons number of protons atomic mass 8. a. b. c. d. What charge does an electron have? positive no charge negative they change 9. a. b. c. d. Which of the following statements is true… the number of protons equals the number of valence electrons the number of electrons equals the number of protons the number of neutrons always equals the number of electrons the number of protons always equals the number of neutrons 10. Electrons travel in…. a. orbits b. different energy levels c. energy shells d. all the above 11. How many electrons occupy the lowest energy level? a. 2 b. 32 c. 8 d. 18 12. Why are atoms electrically neutral? a. Because neutrons have no charge only b. The number of protons equals the number of neutrons c. The number of neutrons equals electrons d. The number of electrons equals the number of protons 13. If an atom has all of its energy shells occupied by the maximum number of available electrons we say the atom is… a. neutral b. reactive c. diatomic d. stable 14. If an atom contains 8 electrons in its valence shell, we say the atom is… a. neutral b. reactive c. non-reactive d. un-stable 15. Which statement occurs if you change the number protons in an element a. nothing b. the element totally changes into a different element c. the atom does not change just some of its behavior d. the number of neutrons will change 16. Which of the following occurs if you change the number of neutrons in an atom a. nothing b. the atom totally changes c. the number of electrons will change d. the atom forms an isotope 17. The periodic chart is a chart of… a. elements b. compounds c. molecules d. metal isotopes 18. The difference between carbon-12 and carbon 14 is… a. its number of electrons b. its number of protons c. its number of neutrons d. its atomic number 19. The atomic number of an atom tells us… a. the number of neutrons b. the number of protons c. the mass of the atom d. all the above 24. Consider the two following atoms 12X and a. all of their particles are equal b. they are isotopes of each other c. they have different number of protons d. they have different number of electrons 14 X …Which statement is accurate? 25.Which statement about isotopes is correct? a. they are the same elements b. they have different number of neutrons c. their protons are the same d. all the above 26. If an atom gains or loses an electron, it forms…. a. an ion b. cations only c. anions only d. covalence True/false: 27. Atomic structure refers to the building of compounds 28. The nucleus is the center of the atom 29. Protons are positively charged particles 30. Isotopes are the atoms of the same element with different neutrons 31. Chemical symbols are abbreviations for electrons 32. Covalent bonds are stronger than ionic bonds 33. Stability of an atom with 8 valence electrons is called the octet rule 34. Atoms can share electrons to form ionic bonds 35. Proteins are not affected by extreme heat 36. Enzymes can make any reaction occur faster 37. Enzymes help products overcome the activation energy barrier 38. When products are in a lower energy state than the reactants, energy was absorbed. 39. Catalase is an enzyme that breaks down water 40. Van der Walls forces are stronger that ionic bonds 41. Proteins are made up of amino acids 42. There are 20 different amino acids in the human body 43. Enzymes are specific and are named after the reaction they influence 44. Living organisms do not need enzymes…reactions will eventually supply products 45. Hydrolase breaks down water