7TH GRADE 2ND TERM BELLWORK NOVEMBER - JANUARY ANSWER THE FOLLOWING QUESTIONS IN YOUR NOTEBOOK. LABEL IT AS “BELLWORK” WITH THE DATE ON TOP • 1 Based on our class discussion last week, what is the outermost (outside) layer of the earth? • 2 Which layer of the earth is the thickest? • 3 Which layer is the thinnest? • 4 Find the density of an object with a mass of 124 grams and 31 ml. • 5 Is the object a solid or a liquid? • 6 How do you know? • 7 What are two ways we have learned about the core of our earth? • 8 (#7 continued) • 9 What determines how the layers of the earth lie? • 10 Why do we have to look at water directly from eye view to accurately measure volume? BELL WORK 11/5 (A) AND 11/6 (B) ANSWER THE FOLLOWING QUESTIONS CAREFULLY 1. (3 points) If you have a 4 cm3 sample of rock salt with mass of 10 grams, what is the density? You will receive one points for each of the following: T show work (including the formula used), correct answer, labeled correctly. 2. (5 points)Find the density of an unknown liquid in a beaker. The empty beaker’s mass is 165 grams. With the unknown liquid inside the beaker, the total mass is 309 grams. The volume of the unknown liquid is 125 mL. Is the liquid pure water? Explain your answer. You will receive one point for each of the following: show work (including the formula used), correct answer, labeled correctly. Correct answer of whether it is pure water. Explained with full sentences. 3. (1 point) Why does a rock sink when it is thrown into water? 4. (1 point) What do meteorites tell us about the interior of the earth? NOVEMBER 30, 2015 – WRITE ANSWERS INTO YOUR NOTEBOOK • 1. How would you calculate the density of an object? (Yes, I want the formula) • 2. What information do earthquakes give us about the interior of the earth? • 3-5. You put mercury (density of 13.5 g/cm3), wood (density of .85 g/cm3), and aluminum (density of 2.7 g/cm3) into a tube. What order would they settle in, from the bottom to the top? Why? DECEMBER 2, 2015 •Define binomial nomenclature. Give an example . DECEMBER 4 (A DAY) DECEMBER 7 (B DAY) • 1. List 3 of the 6 attributes that determines whether an organism is living. • 2. Spell DNA (extra credit – no peeking!) DECEMBER 8 (A DAY) DECEMBER 9 (B DAY) 1. Why do we classify? 2. What contributions did Aristotle give to classification? 3. What contributions did Carlos Linnaeus give to classification? 4. What are the three parts of the atom? 5. Is NaCl an element or a molecule? Why?