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Calculate the density of an object if the mass is 10g and the volume is 27cm3. D = M/V D = 10/27 D = .37 g/cm3 2. Calculate the density of an object if the mass is 15g and the volume is 20cm3 . D = M/V D = 15/20 D = .75g/cm3 Of questions 1 and 2, which was the most dense? .75 g/cm3
Physical Changes – Tearing, Cutting, Boiling, Changing from a gas to a liquid • Chemical Changes – Rusting, Exploding, photosynthesis, electrolysis
5. What is the atomic mass of this element? 4 (2 protons plus 2 neutrons) 6. What is the name of this element? Helium 7. What is the atomic number of the element? 2 Proton + Neutron Electron -
8. Look at the following equations and circle the reactants and put a square around the product. A. H2CO3 → H2O+ CO2 • 2Na + Cl2 → 2NaCl • How many elements are in the products in A? 3 • How many elements are in the reactants in B? 2 • How many atoms are in the products in equation A? 6 • How many atoms are in the reactants in equation B? 6
What law states that matter is always conserved in a chemical reaction? Law of Conservation of Matter
14. What occurs in a chemical reaction? Gas produced, heat created or absorbed, new substance is formed, or color change
15. If an atom has an atomic mass of 14, what is the number of electrons? 7 What is the number of protons? 7 7 positively charged and 7 negatively charges particles ensures that the atom is neutral 16. If an atom has 23 protons and 23 electrons, what is the atomic number of this element? 23 17. In an experiment 15 g of salt was added to 100 mL’s of water. After the experiment was completed what is the total amount of salt water? 115 mL 18. If the water is allowed to evaporate, how much salt can be collected? 15 g
What is the formula for speed? S = D/T 20.What is the formula for work? W = F X D 21. What is the formula for force? F = M X A
22. Calculate the amount of work done when a force of 50 Newtons is moves a box 15 meters. W = F X D 750 J 23. What is the speed of a plane that travels 2000 miles in 5 hours? S = D/T 400mph 24. Calculate the force used to move a 100 kg car 20 meters with an acceleration of 10m/s/s. F = M X A 1000 m/s/s
100 Newtons 250 Newtons 25. Circle the arrow applying the greater force. Which direction will the force pull? right 26. Net force is 150 N • A marble rolls across the table and slows down, what is needed to change the marble’s direction? An unbalanced force
What is happening to the object on the graph? • It is at rest • What is happening to the object on the graph? • It is moving at a constant speed
What is the mass of an object that accelerated 5.0 m/s2 with a force of 100N? 20g 31. What is the acceleration of an object that has a mass of 30g and moves with a force of 300N? 10 m/s/s
I Write if the action taken by the student was correct or incorrect. Write C for correct and I for incorrect. 32. ______ Beth was curious about her lab, so she tasted all the chemicals on the lab cart. 33. _____ Joe was chasing Kevin the hallway, they ran into their science room and continued to tease each other. Joe threw Kevin’s binder across the room, almost knocking over some beakers. 34. ______ Cheryl had some extra chemicals left over from her lab; she disposed of them according to her teacher’s directions. 35. _____ Stacy tied back her long, beautiful hair before she started her lab. 36. _____ Tracy refused to wear her goggles, instead she rested them on her forehead, whenever the teacher walked by, she would quickly put them on to cover her eyes. I C C I
37. Where are the most reactive elements located? On the left of the stairs, family 1 38. Where are the least reactive located? On the right of the stairs, family 18 39. What are the characteristics of metalloids? They have characteristics of both metals and non-metals 40. Which Group is most likely to react with other elements? Group 1
echanical Draw an icon for each type of energy: 41. Fill out the following: M____________________ R____________________ C____________________ E____________________ N____________________ T_____________________ S_____________________ adiant hemical lectrical uclear hermal ound
42. What are the types of fronts on the map? Cold, warm and occluded 43. What type of pressure is over the state of Arizona? Low 44. Where do you predict the cold front will be October 14, (tomorrow)? Further east and south
45. 46. How does moving air affect global temperatures? Warm air and cold air is distributed in convection currents as warm air rises and cool air sinks. High pressure areas move to low pressure areas, making global temperature more evened out.
How do global wind patterns and ocean temperatures contribute to catastrophic weather events? Warm water in the Atlantic creates low pressure systems called Hurricanes.