Could someone help me answer these questions?
ONCEPTUAL InLySICCU SCIENCE PRACTICE SHEET Chapter 14: Elements of Chemistry Chapter 14: Elements of Chemistry The Submicroscopic Physical end Chemical Changes Chemisty sighs 1. What distinguishes a chemical change from a physical change O O 2. Based upon observations alone, why is distinguishing a chemical change from a physical change not always so straight-forward? 0909 Try your hand at catagorizing the following processes as either chemical or physical changes. Some of these examples are debatable! Be sure to discuss A B C your reasoning with fellow classmates or your instructor. (circle one) 1. How many molecules are shown in 3.A cloud grows dark. - chemical physical 2. How many atoms are shown in 4. Leaves produce oxygen.- chemical physical 3. Which represents a physical change? B-A B - C (circle one) 5. Food coloring is added to water. chemical physical 1. Which represents a chemical change? B -A B - C (circle one) 6. Tropical coral reef dies. chemical physical 5. Which box(es) represent(s) a mixture? 7. Dead coral reef is pounded by waves into beach sand.- - - - chemical physical G. Which box contains the most mass? physical 7. Which box is coldest? 8. Oil and vinegar separate. chemical B. Which box contains the most air 9. Soda drink goes flat- - chemical physical between molecules? 10. Sick person develops a fever. . chemical physical 11. Compost pit turns into mulch. chemical physical 12. A computer is turned on -- chemical physical 13. An electrical short melts a computer's integrated circuits. chemical physical 14. A car battery runs down.. chemical physical A B 15. A pencil is sharpened.-. chemical physical 3. How many molecules are shown In 16. Mascara is applied to eyelashes. chemical physical 10. How many atoms are shown in A 17. Sunbather gets tan lying in the sun. - chemical physical 1 1. Which represents a physical change? B -A B - C (circle one) 18. Invisible ink turns visible upon heating- - chemical physical 12. Which represents a chemical change? B -A - C (circle one) 19. A light bulb burns out. C chemical physical 13, Which box(es) represent(s) a mixture? 20. Car engine consumes a tank of gasoline. chemical physical 14. Which box contains the most mass? 15. Which should take longer? C (circle one) 21. B vitamins turn urine yellow- chemical physical 16. Which box most likely contains ions? Chapter 12: Atoms and the Periodic Table Densities of the Elements The periodic table below shows the densities of nearly all the elements. As with the melting points, e elements either gradually increase or decrease as you move in any particular direction. Use colored pencils to color in each ele to color in each element according to its density. Shown below suggested color legend. Color lightly so that symbols and numbers are still visible, (Note; A elements are marked with an asterisk and should be the same ensities, which are given in units of g/L, are much less than the densities non-gaseous elements, whi clements, which are given in units of g/mL) Color Density (c/ml) Color Density (g/ml ) Violet gaseous elements Yellow 16 - Blue 5- 0 Orange 20 -16 8 - - 5 Red. 23 20 Cyan Green 12 - 1 2 | 3 | 4 | 5 | 6 | 7 1 8 1 9 1 10 11| 121 13| 14| 25| 16| 17| 18 H . 0 09 Densities of the Elements 018 05 16 (9/ml) 23 20 125 143 170 090 No Mg C Ar 27 23 18 21 321 176 09 1 30 45 61 72 79 18 69 69 90 71 80 59 5.7 58 759 373 15 25 85 65 85 68 15 124 124 120 105 87 73 57 67 62 49 509 10 95 62 153 166 193 210 226 22 4 215 139 173 19 14 97 98 4 973 58 or Una Ung Unh Uns Uno Une . density of gaseous phose in of. Lanthanides 69 67 60 72 75 57 24 67 86 68 51 93 69 98 Actinides 1. Which elements are the most dense? 2. How variable are the densities of the lanthanides compared to the densities of the actinides? 3. Which atomic groups tend to go from higher to lower densities reading from top to bottom? (Identify each group by its group number). 4. Which atomic groups tend to go from lower to higher densities reading from top to bottom
