Practice questions for the final these are true and false, your test in not all true and false.

1. Practice questions for the final these are true and false, your test in not all true and false. The questions on you test will only be similar not exactly the same.

2. 1. In order for an atom to be balanced it must have the same number of protons and neutrons. 2. The sub atomic particles of an atom are the protons and the electrons. • If an atom is reactive it will not gain or lose electrons. • Energy doesn't have to involve motion.

3. 5. Electron dot diagrams illustrate valence electrons. 6. The elements in group _4__ are non-reactive atoms. 7. The mass number of an atom is the number of protons plus the number of electrons. 8. When you ride a playground swing, your potential energy is greatest at the highest point.

4. Energy is measured in watts. 10. All isotopes of hydrogen have the same atomic number. 11. The center of the atom contains protons and quarks. 12.Cutting the grass is a chemical change.

5. 13. Fizzing or foaming is evidence that a chemical change may have occurred. 14. There are 18 groups and 7 periods on the periodic table 15. Energy from the Sun and energy from food are just different forms of the same thing. 16. Mixing peanuts, pretzels and cereal for snack mix is a physical change.

6. 17. The number of protons in an atom is the same as its atomic number. 18. Mixing together the ingredients for a cake and then baking the cake is a chemical change. 19. The modern atomic model is called the Electron Cloud Model. 20. One of the flaws in John Dalton’s atomic theory was that he thought the atom could not be sub-divided.

7. 21. As mass decreases, kinetic energy decreases, if there no change in the velocity. 22. Carbon is in group 14 and period 3 23. Neutrons and protons are each composed of 3 quarks. 24. The average atomic mass for oxygen is 15.99 but the mass number for the most common form of oxygen is 16.

8. 25. Radiant energy travels from the Sun to Earth and is transformed into light energy by plants. 26. The periodic table is an arrangement of elements in increasing atomic masses. 27. Production of an odor is evidence that a chemical change may have occurred. 28. Ripping a piece a piece of paper in half is physical change.

9. Second set of questions

10. 29. Energy is the ability to cause change. 30. The scientific shorthand of the element sodium is Na. 31. There are more metals than non-metals on the periodic table. 32. Oxygen had 8 protons therefore it has 8 electrons.

11. 33. Electrons are found in a cloud area surrounding the nucleus. 34. The nucleus is positively charged. 35. In an exothermic reaction energy is released 36. Acceleration is rate of change of velocity.

12. 37.One mole of any element is equal to its average atomic mass in grams. 38.To check you instantaneous speed you would call the highway patrol. 39.The transfer of thermal energy by a current in a fluid is called Conduction. 40.In a chemical formula a coefficient indicates the number of atoms.

13. 41. Heat is defined as average potential energy in a substance. 42. According to the Kinetic Theory of matter particles move in predicable patterns. 43. Temperature is best defined as the measure of potential energy in particles. 44. The SI unit for Temperature is degree.

14. 45.Velocity includes distance, time and direction. 46.Matter is classified as pure substances and mixtures. 47.By increasing the surface area of a substance in a chemical reaction the process stop will speed up. 48.There are two kinds of pure substances elements and atoms.

15. According to the law of conservation of energy, the total amount of energy in the universe changes constantly. 50. 35m/s is an example of acceleration.

16. Third set of questions

17. 51. A Mole is a chemistry unit used to indicates a large number of atoms or molecules. • 23 m/s north is an example of speed. • Salt and water is a suspension. 54. The only elements that do not bond are those with 8 energy levels.

18. Liquids has a definite shape and volume • A girl running a race is a good example of motion. 57. If two liquids are mixed together and the resulting liquid is green it certain that a physical change has taken place.

19. A fruit salad is a homogeneous mixture • There are 3 elements are in H2SO4. • The SI unit for heat is Degree. 61. There are two kinds of mixtures homogeneous and heterogeneous

20. 62. Melting is a change directly from a solid to a gas. 63. The change from a liquid to a solid is called Condensation. 64. The change from a liquid to a gas is called Evaporation 65. To calculate average speed you must know total time and total distance.

21. 66. The change from a gas to a liquid is called Evaporation. 67. In a chemical formula a subscript indicates the number of molecules. 68. An apple and a piece paper will fall through the air at a different rate because of gravity. 69. In a chemical reaction energy can be destroyed. 70. The kinetic energy of an object increases as its velocity increases.

22. 4th set of questions

23. 70. The kinetic energy of an object increases as its velocity increases. 71. Gases have a no definite volume and no definite shape but no abundance of negative and positive charged particles. 72. If you increase the temperature of a substance the movement of the particle will move randomly. 73. Agitating the reactants in a chemical procedure will slow down the process.

24. 74. When metal and a nonmetal bond a covalent bond form. 75. According to the Octet Rule and atom must have 18 electrons in its outer energy level to be stable. 76. Solids have no definite shape but there is a definite volume. 77. In an endothermic reaction energy is consumed.

25. 78. The change from a solid to a liquid is called Freezing. 79. The SI unit for energy is the joule. 80. When two nonmetals bond they form a ionic bond. 81. This is the most common state of matter.

26. 82. The noble gases in group 18 do not form compounds because they are all solids. 83. The transfer of thermal energy as part of the electromagnetic spectrum is Radiation. 84. Matter has two basic kinds of properties chemical and mechanical.

27. The transfer of thermal energy by a direction contact Conduction. • There are 7 atoms in the compound H2SO4. 87. 35 m/s north is an example of velocity?

28. 88. The force that holds atoms together is called gravity. 89. Elements that lose electrons have less than 4 electrons in their outer energy level. 90. In the mentos and coke lab, the reaction was physical.