Science in the news.Directions: Read the Science News section on pages 4 to 7. Then test your knowledge by circling the letter of the correct answer, below. 1. A superheavy element is: a. an atom that weighs more than 45 kilograms (100 pounds). b. an atom that contains at least 112 protons in its nucleus. c. a substance made up of one atom. d. a substance with a high electric charge. 2. Why weren't scientists able to study elements 113 and 115? a. They were too dangerous to handle. b. The superheavy elements disintegrated too quickly. c. They were moving so fast that the scientists couldn't observe them. d. The elements are tiny and can't be seen. 3. What's one piece of evidence discovered by Opportunity that suggests water may have existed on Mars? a. bedrock b. a crater full of salty water c. hematite hematite (hĕm`ətīt), mineral, an oxide of iron, Fe2O3, containing about 70% metal, occurring in nature in red to reddish-brown earthy masses and in steel-gray to black crystalline forms. d. groundwater inside Meridiani Planum Meridiani Planum is a plain located 2 degrees south of Mars' equator (centered at ), in the westernmost portion of Terra Meridiani. It hosts a rare occurrence of gray crystalline hematite. 4. Which of the following is NOT true about jarosite? a. Geologists think it formed on Mars when salty water evaporated. b. It forms in acidic water. c. It's a sulfur-containing mineral d. The mineral is a sign that water may have existed on Mars long ago. 5. Bacteria cause tooth decay Tooth Decay Definition Tooth decay, which is also called dental cavities or dental caries, is the destruction of the outer surface (enamel) of a tooth. by a. generating sugars. b. dissolving your tooth enamel. c. loosening your teeth from your gums. d. producing a toxic chemical Any chemical which, through its chemical action on life processes, can cause death, temporary incapacitation, or permanent harm to humans or animals. This includes all such chemicals, regardless of their origin or of their method of production, and regardless of whether they are produced . 6. From the story on tooth decay, you can infer that people from the Americas have more tooth decay because they a. consume more sugar. b. don't floss (Free, Libre and Open Source Software) See free software and open source. . c. don't brush. d. consume less sugar. 7. According to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. the formula, how easily you can pick up food with chopsticks depends on all of the following EXCEPT: a. the slipperiness of the food. b. the food's mass. c. the number of times you've practiced using chopsticks. d. how hungry you are. 8. How hard you have to hold slippery foods between chopsticks depends on a. gravity. b. kinetic friction kinetic friction See under friction. . c. suction. d. mass. 9. Opportunistic bacteria that thrive on a shower curtain most affect the health of a. a sick person. b. someone who bathes instead of showers. c. a healthy teenager. d. someone who showers regularly. 10. Which of the following is true about soap scum bacteria? a. You can see them with your naked eyes Naked Eyes is an English synthpop band, best known for their first single, a cover of the Burt Bacharach / Hal David standard "(There's) Always Something There to Remind Me" (Bacharach himself has cited the cover as a personal favourite). . b. Disinfectant won't kill them. c. They don't live very long. d. They feed on some carbon compounds. Take It Further: Research and report on either of the following: The process that causes tooth decay or how bacteria can be beneficial to your health. ANSWERS 1. b 2. b 3. c 4. c 5. b 6. a 7. d 8. b 9. a 10. d |
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