1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
_____ The atomic # of Carbon is 6 which means it has 6 protons and 6 electrons. _____ The # of neutrons = mass # - atomic #. _____ Isotopes are the same elements with different numbers of electrons. _____ The following are correct electric symbols: Q = charge, I = voltage, E = energy. _____ The following are correct electric units: charge in coloumbs, energy in joules. _____ A neutral object is repelled by a charged object. _____ A negative object is repelled by another negative object. _____ The density of an object is calculated by: mass x volume. _____ M = D/V. _____ A Bohr (shell) diagram for nitrogen would have 2 electrons in the first shell and 7 electrons in the
11. 12. 13. 14. 15.
second shell. _____ The second shell of an atom can hold a maximum of 8 electrons. _____ Outer electrons of an atom are called “valence” electrons. _____ Using the “cross-down method” the correct formula for sodium oxide would be Na2O3. _____ Using the “cross-down method” the correct formula for barium chloride would be BaCl2. _____ During ionic bond formation, a metal atom loses electrons (which becomes negatively charged) to a
non-metal atom (which becomes positively charged). _____ In ionic bond formation between sodium and chlorine, sodium become Na+ and chlorine becomes Cl-
17. 18. 19. 20. 21. 22. 23. 24. 25. 26.
and the 2 ions then attract each other. _____ In question #16 above, both Na and Cl achieve full outer shells of electrons. _____ In covalent bonding, ions are formed that share electrons. _____ A covalent bond forms between a metal and a non-metal (ie. CO2). _____ In electricity, Q = I/t. _____ In electricity, I = current and is measured in volts. _____ 1 ampere = 1 coulomb/second. _____ In electricity, V = E/Q. Where V = volts and E = electrons. _____ In electricity, R = V/I. Where R = resistance measured in ohms. _____ Ohms law is: V = I x Q. _____ In drawing electrical circuits, the negative terminal of a battery is the long vertical line and the positive
27. 28. 29. 30. 31. 32. 33. 34. 35. 36.
terminal is the short vertical line. _____ Electrons leave the negative terminal and return to the positive terminal of a battery. _____ Examples of electrical “loads” are bulbs and heating coils. _____ Electrical loads have high resistance that hinder the passage of protons through them. _____ When an ebonite rod is rubbed with fur, the rod becomes negative as it gains protons. _____ If an ebonite rod rubbed with fur touches a pith ball, the ball becomes negatively charged. _____ After touching the pith ball in #31 above, the ball will be attracted to the ebonite rod. _____ A neutral object is drawn with equal numbers of positive and negative charges. _____ Drawings on the exam can be done in pen or pencil but must be large and clear. _____ A glass rod has a greater pull on electrons than a plastic bag. _____ When a positive glass rod is brought close to a metal leaf electroscope, the leaves repel because they
37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53.
are positively charged. _____ Charging by induction occurs when a charged rod touches a neutral object. _____ In the reaction: A + B ----> C, the reactants are A + B and the product is C. _____ copper + oxygen ----> copper oxate. _____ potassium + chlorine + oxygen ----> potassium chlorate. _____ Colour is a qualitative physical property of matter. _____ Objects with high lustre tend to sink in water. _____ A heterogeneous mixture has more than one visible particle. An example is water. _____ A homogeneous solution would be apple juice. _____ An example of a pure substance is human blood. _____ The release of light, heat, and sound indicates a physical change. _____ According to particle theory, all particles are at rest until heated. _____ N2 is an element whereas H2O is a compound. _____ The alkali metals include sodium and calcium and are in Group 1. _____ The halogens have a valence of 7 and include Cl and Br. _____ Noble gases such as fluorine have a filled outer shell so they are stable or inert. _____ When writing atomic notation for an element, the mass # is above the atomic #. _____ Neutrons and protons are located in the nucleus of an atom and electrons are outside the nucleus
travelling in paths called “isotopes”. _____ When connected to an 8 Volt battery, a 9 V bulb is less bright than a 10 V bulb. _____ When 2 batteries are connected in series the overall voltage is higher than if they are connected in
parallel. _____ Connecting batteries in parallel does not increase the overall voltage but allows the batteries to last
57. 58. 59. 60. 61. 62. 63.
longer. _____ If 2 bulbs are connected in parallel and one goes out the other also goes out. _____ The higher the voltage of a battery, the greater the energy given to each coulomb of charge. _____ The bottom of a thundercloud is positively charged and induces a negative charge on the ground. _____ When an object is discharged, excess charge (electrons) enter or exit it to “ground”. _____ To measure E/Q use a voltmeter, to measure Q/E use an ammeter. _____ The following are correct valences: alkali metals=1, alkaline earth metals=3, halogens=7. _____ There are practice quizzes on zeroBio that will help you study for the exam!
Grade 9 Science Exam: True-False Review