7th Grade- Chapters 1-3 Chemical Interactions Book Test Review
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Transcript

  • 1. Chapters 1-3 Review Game
  • 2. Compound
    • A substance made of two or more elements chemically combined in a specific ratio, or proportion.
  • 3. coefficients
    • You can balance a chemical change by changing the
  • 4. physical change
    • A change that alters the form or appearance of a material but does not make the material into another substance.
  • 5. Element
    • A substance that cannot be broken down into any other substances by chemical or physical means.
  • 6. chemical reaction
    • The process in which substances undergo chemical changes that results in the formation of new substances.
  • 7. pH scale
    • shows concentration of hydrogen ions in a solution
  • 8. chemical change
    • A change in matter that produces a new substance.
  • 9. solubility
    • Measure of how much solute can dissolve in a solvent at a given temperature
  • 10. Solution
    • A well-mixed mixture.
  • 11. mixture
    • Two or more substances that are mixed together but not chemically combined.
  • 12. Molecule
    • combination of two or more atoms.
  • 13. Chemical formula
    • A combination of the symbols that represent the elements in a compound.
  • 14. chemical change
    • A change in matter that produces a new substance.
  • 15. Chemical Bond
    • The force that holds atoms together.
  • 16. Atom
    • smallest particle of an element.
  • 17. Chemical Symbol
    • A one or two letter set of characters that is used to identify elements.
  • 18. Precipitate
    • A solid that forms from a solution during a chemical reaction.
  • 19. Chemical Equation
    • A short, easy way to show chemical reactions, using symbols instead of words.
  • 20. neutralization
    • Reaction between an acid and a base producing water and a salt
  • 21. Unsaturated
    • If you can continue to dissolve more solute in a solution, you have a(n) ________ solution.
  • 22. Conservation of mass
    • The principle stating that matter is not created or destroyed during a chemical reaction.
  • 23. Chemistry
    • The study of the properties of matter and how matter changes.
  • 24. solute
    • The part of a solution that is present in the smaller amount
  • 25. Subscript H 2 0
    • A number in a chemical formula that tells the number of the atoms in a molecule or the ratio of the elements in a compound.
  • 26. suspension
    • mixture in which particles can be seen & easily separated by settling or filtration
  • 27. Covalent bond
    • Chemical bond formed when two atoms share electrons
  • 28. Synthesis
    • A chemical reaction in which two or more simple substances combine to form a new, more complex substance.
  • 29. Products
    • A substance formed as a result of a chemical reaction.
  • 30. Reactants
    • A substance that enters into a chemical reaction.
  • 31. Coefficient
    • A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
  • 32. Concentration
    • The amount of one material in a volume of another material.
  • 33. Activation energy
    • The minimum amount of energy that has to be added to get a chemical reaction started.
  • 34. Replacement reaction
    • A reaction in which one element replaces another in a compound; or when two elements in different compounds trade places.
  • 35. Indicator
    • A compound that changes color when it comes in contact with an acid or a base
  • 36. Exothermic reaction
    • A reaction that releases energy in the form of heat.
  • 37. decomposition
    • A chemical reaction that breaks down compounds into simpler products.
  • 38. Enzyme
    • A biological catalyst that lowers the activation energy of reactions in cells.
  • 39. Endothermic reaction
    • A reaction that absorbs energy in the form of heat.
  • 40. Solvent
    • The part of a solution that is present in the larger amount.
  • 41. Fuel
    • A material that releases energy when it burns.
  • 42. Base #8-14 on the pH scale
  • 43. Concentrated solution A mixture that has a lot of solute dissolved in it.
  • 44. Solution
    • A very well mixed mixture.
  • 45. fire prevention best form of fire safety
  • 46. acid A substance that turns blue litmus paper red.
  • 47. Acid A substance that turns blue litmus paper red.
  • 48. Inhibitor
    • A material that decreases the rate of a chemical reaction.
  • 49. base Feels slippery
  • 50. Indicator
    • A compound that changes color when it comes in contact with an acid or a base
  • 51. salt Any ionic compound made from the neutralization of an acid with a base.
  • 52. neutral 7 on the pH scale
  • 53. atomic number number of protons in the nucleus of an atom
  • 54. Acid #0-6 on the pH scale
  • 55. catalyst
    • A material that increases the rate of a chemical reaction by lowering the activation energy.
  • 56. alloy
    • Material made of 2 or more elements that has the properties of a metal
  • 57. matter
    • Anything that has mass and takes up space
  • 58. Acid Tastes sour
  • 59. Alkali metals Group 1
  • 60.
    • lower freezing point of solvent
    • raise boiling point of solvent
    2 effects of solutes on solutions
  • 61. period row across the periodic table
  • 62. Fuel, oxygen, heat 3 parts of the fire triangle
  • 63. Noble gases Group 18
  • 64. Combustion A rapid reaction between oxygen and fuel that results in fire.
  • 65. Base A substance that turns red litmus paper blue.
  • 66. Base Tastes bitter
  • 67. digestion Process that breaks down complex molecules of food into smaller particles
  • 68. group (or family) column on the periodic table
  • 69. halogens
    • Group 17
  • 70. malleable property that metal can be rolled into thin sheets or shapes
  • 71. colloid mixture containing small, undissolved particles that do not settle out - particles large enough to scatter a beam of light
  • 72. Dilute solution Mixture that has only a little solute
  • 73. corrosive Eat away at other materials
  • 74. ductile property that metal can be pulled into wire
  • 75. hydrogen Element with 1 valence electron
  • 76. Base A substance that turns red litmus paper blue.
  • 77. Formation of a new substance Best evidence for a chemical reaction