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2 nd 6 wks 3 Week Review

2 nd 6 wks 3 Week Review. PowerPoint by: Katherine Pease Questions by: Rebecca Neill. 1. Steel wool in Jar A rusts and the steel wool in Jar B does not rust. What is the manipulated variable that best explains the difference?. Answer:. Exposed to air and water, one is not

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2 nd 6 wks 3 Week Review

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  1. 2nd 6 wks 3 Week Review PowerPoint by: Katherine Pease Questions by: Rebecca Neill

  2. 1. Steel wool in Jar A rusts and the steel wool in Jar B does not rust. What is the manipulated variable that best explains the difference?

  3. Answer: • Exposed to air and water, one is not • Manipulated Variable is the lid www.micrecol.de

  4. 2. What evidence supports that a chemical change takes place when rusting occurs? www.flickr.com

  5. answer • Color change • Change in chemical makeup www.flickr.com

  6. 3. What type of property is the density of a liquid? Physical or Chemical www.flickr.com

  7. Answer: • Physical

  8. 4. While conducting an investigation using chemicals, what should be avoided when observing odor? www.wonderbaby.org

  9. Answer: • Taking a big whiff of substance should be wafted towards scientist

  10. 5. A student conducts an investigation to the chemical reaction of an Alka-Seltzer tablet in water. What evidence supports this type of reaction? feeds.gawker.com

  11. Answer: • Bubbles Formed

  12. 6. A student conducts an investigation using a Ziploc bag and some chemicals. Two scoops of calcium carbonate, one scoop of baking soda, and 10ml of water are combined in the Ziploc bag. After 30 seconds, the student observe is the bag increasing in size and feels an increase in temperature.

  13. 6. What two pieces of evidence supports a chemical change has taken place? sacramento.metblogs.com

  14. Answer: • Increase in size • Increase in temperature

  15. 7. Give an example of a chemical change using an apple as the substance. www.flickr.com

  16. Answer: • Rot • Decompose

  17. 8. Give an example of a physical property using a shoe as the substance.

  18. Answer: • Color • Size • Density • Texture

  19. 9. A student combines 3 grams of baking soda with 20ml of vinegar in a 100ml beaker. The student observes bubbles rising to the surface and bursting. • What evidence supports a chemical change has taken place? www.flickr.com

  20. Answer: • Bubbles • Odor

  21. 10. Which of the three types of elements would have the characteristics of being shiny, ductile, and conducting heat well? www.ceram.co.uk

  22. Answer: • Metals

  23. 11. What type of change can be observed in the ice cubes? www.prairietablegourmet.com

  24. Answer: • Physical

  25. 12. Physical changes occurring during the water cycle. What is the process when water changes in state from a gas to a liquid? www.flickr.com

  26. Answer: • Condensation

  27. 13. The displacement method was used to measure the volume of a rock. What is the volume of the rock?See Handout for diagram

  28. Answer: • 25ml

  29. Scientists use a graduated cylinder to measure the volume of something. Remember volume is the amount of space an object takes up. Because the liquid is curved, to read the volume correctly you must look at the meniscus (the bottom of the curve). What is the volume of liquid in each container?

  30. Use a graduated cylinder to measure the volume of an irregular shaped solid • Read the beginning • volume • Drop the object in on an angle. • Subtract the • beginning volume from the new water level. • What is the volume of the object?

  31. To find the Volume of Solid: Use the formula Length x Width X Height It doesn't matter what you consider your length, width, or height as long as you DON’T MEASURE THE SAME SIDE TWICE

  32. Metals on the Periodic Table of Elements might have this property. What is it? HOT WATER COLD WATER Copper

  33. Which doesn't belong with the others? • Element Molecule Compound Salt Why not?

  34. Which doesn't belong with the others? • Compound Cl2 O3 Molecule Why not?

  35. Name properties of the elements highlighted in yellow Name some properties of most of the elements highlighted in blue Name properties of most of the elements highlighted in pink Name properties of most of the elements highlighted in orange

  36. Match the words to the correct symbol(s) which would represent a correct model of them • Element • Molecule • Compound • Mixtures • Solution B A C D E

  37. Common compounds and their formulas • Hydrochloric acid HCl • Salt NaCl • Water H2O • Sugar C12H22O11 • Carbon dioxide CO2 What are the elements in each? How many total atoms are in each? How many elements are in each?

  38. Match the word to the picture which best represents it • Boiling point • Radioactive • Density • Non-reactive A B C D 100 oC

  39. Look at the chemical reactions. • What do they tell you about the chemical properties of a compound? Na + Cl  NaCl Silver reactive metal poisonous green gas nutrient we need to live (salt) O X Y G E N C + O  CO2 Black brittle solid clear odorless gas dense gas we expel as waste

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