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Chemistry Unit 1

Chemistry Unit 1. Question 1 - 10. What are the vertical columns on the periodic table called?. Answer 1 – 10. Groups/Families. Question 1 - 20. What is the name for the branch of chemistry that focuses on the study of carbon compounds?. Answer 1 – 20. Organic Chemistry. Question 1 - 30.

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Chemistry Unit 1

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  1. Chemistry Unit 1

  2. Question 1 - 10 • What are the vertical columns on the periodic table called?

  3. Answer 1 – 10 • Groups/Families

  4. Question 1 - 20 • What is the name for the branch of chemistry that focuses on the study of carbon compounds?

  5. Answer 1 – 20 • Organic Chemistry

  6. Question 1 - 30 • How many periods are on the Periodic Table?

  7. Answer 1 – 30 • 7 Periods

  8. Question 1 - 40 What are the names of the following elements? • Na • K • W • As

  9. Answer 1 – 40 Na → Sodium K → Potassium W → Tungsten As → Arsenic

  10. Question 1 - 50 • What are the horizontal rows on the periodic table called?

  11. Answer 1 – 50 • Periods

  12. Question 2 - 10 • How many grams are in 250 mg?

  13. Answer 2 – 10 • 0.250 g

  14. Question 2 - 20 • How many mL are in 1 kL?

  15. Answer 2 – 20 • 1,000,000 mL

  16. Question 2 - 30 • What is the density of an object that has a mass of 15g and a volume of 7.5mL?

  17. Answer 2 – 30 • 2 g/mL

  18. Question 2 - 40 • What is the volume of an object that has a mass of 25 g and a density of 50 g/mL?

  19. Answer 2 – 40 0.5 mL

  20. Question 2 - 50 The density of tin is 15.65 g/cm. What is the mass of a block of tin that measures 2.00 cm x 8.00 cm x 4.50 cm?

  21. Answer 2 – 50 • 1,126.8 g

  22. Question 3 - 10 • Draw a target to show measurements that are precise but not accurate.

  23. Answer 3 – 10

  24. Question 3 - 20 • Define accuracy.

  25. Answer 3 – 20 • A measure of how clue a measurement is to the “true” value.

  26. Question 3 - 30 • A student measure the mass of an object to be 2.54 g. The true mass of the object is 2.97 g. Calculate the student’s percent error?

  27. Answer 3 – 30 • 14.49 %

  28. Question 3 - 40 • A student makes 5 measurements for the length of an object. The measurements are 2cm, 2.3 cm, 1.9 cm, 2.1 cm, and 2 cm. The actual length of the object is 2 cm. Describe the student’s accuracy and precision.

  29. Answer 3 – 40 • The student is both precise (the measurements are close together) and accurate (the measurements are close to the true value).

  30. Question 3 - 50 • Define precision.

  31. Answer 3 – 50 • A measure of how close a set of measurements are to one another.

  32. Question 4 - 10 List a physical property of the object shown below.

  33. Answer 4 – 10 Liquid Shiny Pourable etc.

  34. Question 4 - 20 • Is burning paper a physical or chemical change? Explain your choice.

  35. Answer 4 – 20 • Chemical change because a new substance is being created.

  36. Question 4 - 30 Which of the following is a chemical property? • Freezing point • Melting point • Hardness • Ability to react with water

  37. Answer 4 – 30 • Ability to react with water.

  38. Question 4 - 40 Which of the following is a chemical change? • Ripping paper • Freezing water • Cooking food • Melting ice

  39. Answer 4 – 40 • Cooking food

  40. Question 4 - 50 • Define intensive and extensive properties.

  41. Answer 4 – 50 Intensive property → Depends on the type of matter Extensive property → Depends on the amount of matter

  42. Question 5 - 10 • Define heterogeneous mixture and give one example.

  43. Answer 5 – 10 A combination of two or more substances that does not have a uniform composition. Example: Chicken soup Salad Oil and Water

  44. Question 5 - 20 • Define homogenous mixture and give one example.

  45. Answer 5 – 20 A combination of two or more substances that has a uniform composition. Example: Salt water Koolaid

  46. Question 5 - 30 • In how many physical states does water commonly exist? List and describe the phases.

  47. Answer 5 – 30 3 Solid → Ice Liquid → Water Gas → Water Vapor

  48. Question 5 - 40 • What is another name for a homogeneous mixture?

  49. Answer 5 – 40 • Solution

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