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INTRO TO CHEMISTRY

INTRO TO CHEMISTRY. Get started!. Which of the following is NOT matter?. SMOKE. AIR. LIGHT. SAND. VERY GOOD!!. LIGHT. Light is a form of energy and energy is NOT matter!. Back to the question. Next Question. INCORRECT. Try again….

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INTRO TO CHEMISTRY

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  1. INTRO TO CHEMISTRY Get started!

  2. Which of the following is NOT matter? SMOKE AIR LIGHT SAND

  3. VERY GOOD!! LIGHT Light is a form of energy and energy is NOT matter! Back to the question Next Question

  4. INCORRECT Try again…

  5. Which of the following is NOT one of the three physical states of matter? Solid Liquid Gas Aqueous

  6. Very good! Aqueous Solid, liquid, and gas are the three physical states of matter Next Question Back to the question

  7. INCORRECT Try again…

  8. Which of the following best describes carbon monoxide (CO)? Element Compound Homogeneous mixture Heterogeneous mixture

  9. Very Good! Carbon monoxide (CO) is a compound. It is made up of two or more elements CHEMICALLY combined. Compound Next Question Back to the question

  10. INCORRECT Try again…

  11. Salt water is an example of a… Element Compound Homogeneous mixture Heterogeneous mixture

  12. Very good! Homogeneous mixture Salt water is an example of a homogeneous mixture. The mixture looks uniform throughout. However, it is a mixture because both the salt and the water maintain their original properties and can be physically separated. Next Question Back to the question

  13. INCORRECT Try again…

  14. Which of the following CANNOT be broken down into a simpler substance? Oil and water Juice Carbon (C) Sodium chloride (NaCl)

  15. Very Good! Carbon (C) Carbon is an element. Elements cannot be broken into simpler substances. Sodium chloride is a compound, oil and water is a heterogeneous mixture, and juice is a homogeneous mixture. All three of these can be broken into simpler substances. Next Question Back to the question

  16. INCORRECT Try again…

  17. The following are observations of what happens when two solutions are mixed. Which is NOT evidence that a chemical reaction has occurred? There is fizzing and bubbling The test tube feels hotter One of the solutions was yellow to start A solid forms

  18. Very Good! One of the solutions was yellow to start Production of a gas (seen by the fizzing and bubbling), energy released (the test tube felt hotter), and the formation of a solid are all evidence that a chemical reaction has occurred. Next Question Back to the question

  19. INCORRECT Try again…

  20. Which of the following is an example of a chemical change? Breaking a pencil in half Salt dissolving in water The corrosion of metal Grinding garlic

  21. Very good! The corrosion of metal Remember in a chemical change…something NEW is produced Next Question Back to the question

  22. INCORRECT Try again…

  23. Phase changes are an example of a… Chemical property Physical change Chemical change Extensive property

  24. Very good! Physical change A phase change is only a change in state of mater so it is a physical change. Next Question Back to the question

  25. INCORRECT Try again…

  26. What would be the correct symbol for when solid salt (NaCl) is melted? NaCl (s) NaCl (l) NaCl (g) NaCl (aq)

  27. Very good! NaCl (l) When salt is melted it becomes a liquid. Remember that a liquid is different than an aqueous solution. An aqueous solution is made when a solid is dissolved in water. Next Question Back to the question

  28. INCORRECT Try again…

  29. Mercury is a silver colored liquid. The silver color of mercury is an example of a …. Intensive physical property Chemical property Extensive physical property Physical change

  30. Very good! Intensive properties to not depend on the amount of a substance. Extensive properties DO depend on the amount of a substance…like mass or length Intensive physical property Next Question Back to the question

  31. INCORRECT Try again…

  32. What is true about the following reaction:A (s) + B (aq)  C (g) + D (aq) C and D are reactants D is a solid A and B produce solid products A and B are reactants

  33. Very good! A chemical reaction has this general form: Reactants  Products A and B are reactants Next Question Back to the question

  34. INCORRECT Try again…

  35. SCIENTIFIC NOTATION & SIG FIGS Get started!

  36. How do you write 0.00560 in scientific notation? 5.60 x 10-3 0.560 x 10-2 56.0 x 10-4 0.560 x 102 5.60 x 103

  37. Very good! 5.60 x 10-3 Remember that when writing a number in scientific notation, there should be ONE number to the LEFT of the decimal. Since the number is less than 1, the exponent should be negative. Next Question Back to the question

  38. INCORRECT Try again…

  39. 3.6 x 105 could be also written as… 0.00036 3600000 0.000036 0.360000 360000

  40. Very good! Since the exponent is positive, your decimal should be moving to the right. 360000 Next Question Back to the question

  41. INCORRECT Try again…

  42. How many sig figs are in the 0.0003005600? 4 11 10 3 7

  43. Very good! 7 Remember that zeros in front of a number are placeholder zeros and are NOT significant. Terminating zeros to the right of the decimal are significant. Any zero in between significant numbers is significant Next Question Back to the question

  44. INCORRECT Try again…

  45. How many sig figs are in the 70800000? 8 3 4 2

  46. Very good! 3 Remember that zeros after a number but before the decimal are placeholder zeros and are NOT significant. Any zero in between significant numbers is significant Next question Back to the question

  47. INCORRECT Try again…

  48. What is the correct answer to the following problem:7.815 + 2.07 = 9.885 9.89 9.88 9.9

  49. Very good! 9.89 7.815 + 2.07 = 9.885 When adding or subtracting two numbers, your answer should have the same number of decimal places as the measurement with the least number of decimal places. 2.07 has two decimal places so your answer should be rounded to 9.89 Next Question Back to the question

  50. INCORRECT Try again…

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