1. How will you test your prediction is an appropriate helpful hint for what part of the scientific inquiry?

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1 7 th Grade Comprehensive Science II Midterm Exam Part 1: Essay Scientific Inquiry: You may either use your own science project or the passage below to answer the following questions on the scientific inquiry. (Total of 10 points) Sofia is curious to find out which brand of fertilizer produces the tallest tomato plants. After purchasing 3 brands of fertilizer, she decides that Brand C will be the best brand. Her experiment lasted a total of 1 month. Once a month passed, these are the following measurements she gathered from her test: Brand A grew 30 cm, Brand B grew 50 cm, and Brand C grew 10 cm. A. What is the scientific question? B. What is Sofia s prediction? C. Identify the independent variable in this test. D. Identify the dependent variable in this test. E. What is one conclusion one can make from this test? Acids and Bases (Total of 10 points) F. What is the definition of a ph scale? G. Draw a diagram of the scale where you include the range of the scale. H. Add examples of an acid, a base, a neutral substance to your diagram. Part 2: Multiple Choice Directions: Read each question carefully. Then select from the options given the best response. Make sure you bubble in your answer correctly on your scantron form. Any answered bubbled incorrectly will probably be marked wrong. 1. How will you test your prediction is an appropriate helpful hint for what part of the scientific inquiry? a. Experiment b. Conclusion c. Hypothesis 2. In this step, the scientist is actually testing the hypothesis with specific procedures. Also, this is where the variables come into action a. Problem statement b. Prediction c. Experiment 3. A synonym for the manipulate variable is a. Controlled experiment b. Dependent variable c. Independent variable

2 4. This is the part of the scientific inquiry that is a prediction of what you believe the outcome of the test will be a. Results b. Experiment c. Hypothesis 5. The facts, figures, and other evidence gathered through your observations is a. Scientific question b. Results c. Scientific Inquiry 6. Analyzing your data and looking for improvements is an appropriate helpful hint for what part of the scientific inquiry a. Conclusion b. Responding Variable c. Independent Variable 7. A synonym for the responding variable is a. Controlled Experiment b. Dependent Variable c. Independent Variable 8. These is the process used by scientists to discover and explain the natural world a. Scientific method b. Scientific inquiry c. A and B are both correct. 9. What problem did the metric system solve for scientists? a. Scientists were not able to exchange results because they didn t have a common system of measurement. b. Scientists did not have a problem because scientists have always used a common system of measurement. 10. What is the definition of mass? a. The amount of space an object occupies b. The amount of matter in an object c. The distance from one point to another 11. What unit of measurement is used to measure mass? a. Grams (g) b. Celsius (C)

3 12. What tool is used to measure mass? a. A graduated cylinder b. A triple beam balance c. A meter stick 13. What is the definition of volume? a. If the object is a solid, then you must solve for the volume by multiplying length x width x height. b. If the object is a liquid, then the volume cannot be measured c. If the object is a liquid, then the volume can be measured by using a graduated cylinder. 14. The metric system measures temperature using a. Fahrenheit Scale b. Celsius Scale c. A and B are both correct 15. The proportion of mass and volume is the formula for a. Temperature b. Length c. Density 16. If the mass of an object has a mass of 12 grams and a volume of 4 milliliters, then what is the density? a. 2 g/ml b. 3 g/ml c g/ml 17. If the mass of an object has a mass of 9 grams and a volume of 45 milliliters, then what is the density? a. 5 g/ml b. 0.2 g/ml c. 1,250 g/ml 18. An atom of Carbon can never be an atom of Hydrogen. a. An atom of one kind can never be turned into the atom of another kind. b. Atoms of the same element have the same mass. c. Compounds of elements will always follow a ratio or recipe when combining together.

4 19. If one atom of Lithium has a mass of 7 grams, then what is true for all atoms of Lithium? a. All elements or natural, pure substances are made up of atoms. b. Atoms of the same element have the same mass. c. Compounds of elements will always follow a ratio or recipe when combining together. 20. When Hydrogen and Oxygen bond to form the compound water, two Hydrogens are needed and 1 Oxygen is needed. a. All elements or natural, pure substances are made up of atoms. b. Atoms of the same element have the same mass. c. Compounds of elements will always follow a ratio or recipe when combining together. 21. According to the Modern Atomic Model, the locations of the protons, neutrons, and electrons are a. The protons and electrons are inside of the nucleus and orbiting the nucleus are the neutrons. b. The protons and neutrons are within the nucleus and the electrons are located within the electron cloud. c. These descriptions are false because the atom is a solid mass that cannot be broken down any further. 22. In the discovery of the Modern Atomic Model, which group of scientists below contributed their ideas so that the final answer could be found? a. Ernest Ruther ford, Neils Bohr, and Chadwick b. Ancient Greeks, John Dalton, and J.J. Thomson c. Both A and B 23. The modern atomic model is a. Not a true representation of the atom b. A combination of scientists discoveries over time c. A and B are correct For questions 26-31, match the definition with the vocabulary term in the word box. 26. A subatomic particle with no charge or neutral charge 27. A subatomic particle that is positively charged 28. A subatomic particle that is negatively charged 29. A civilization of people that jump started the discovery of the atom. 30. Model used today to represent the atom 31. As a whole describes what all atoms have in common. Word Box A. Chadwick B. Protons C. Modern Atomic Model D. Neils Bohr E. Electrons F. Ancient Greeks G. Neutrons H. Dalton s Atomic Theory

5 32. Science is one of those subjects where the observation and experiments that lead up to new discoveries are just as important as the discoveries themselves. As scientists were on their quest to did the correct model of the atom, what helped scientists greatly? a. As scientist worked to discover and explain the atom, their cooperation or exchanging of results helped them greatly. b. As scientist make discoveries through the years, they were hurt by technology not getting better. c. A and B are incorrect statements 33. How has the periodic table changed over time? a. Mendeleev made the first major change because he organized the periodic table by atomic mass. b. Henry Rosely later made the second major change because he organized the periodic table by atomic number. c. Both A an B are correct. 34. Which of the following definitions for atomic number is correct? a. The atomic number is the number of protons and electrons an element has. b. The atomic number is the number of neutrons the element has. c. The atomic number is the average isotope mass of the element. 35. Au for Gold or C for Carbon are examples of a. atomic symbol b. atomic mass c. atomic number 36. What two subatomic particles are always equal to each other? a. neutrons and electrons b. protons and neutrons c. electrons and protons 37. If you read the periodic table from left to right, what is the general order of the element types? a. metalloids, nonmetals, and then metals b. metals, metalloids, and then nonmetals c. nonmetals, metals, and then metalloids 38. What is the difference between a period and a group? a. Groups are the horizontal rows of the periodic table and the periods are the vertical columns of the periodic table. b. Periods and groups both describe the same type of organization. c. Periods represent only metals and the groups represent the nonmetals and metalloids.

6 39. One of the physical properties of a metal is that they are shiny. Which definition best describes the word shiny? a. the ability to be flattened out into sheets b. how bright the metal is c. very good at conducting heat or electricity 40. One of the physical properties of a metal is that they are ductile. Which definition best describes the word ductile? a. can change its shape easily b. how bright the metal is c. very good at conducting heat or electricity 41. What is one of the chemical properties of metals? a. rust b. ductility c. shininess 42. What is a common property of nonmetals? a. shininess b. malleability c. poor conductor of electricity 43. The element Silicon is found in what group? a. Group 4 b. Group 3 c. Group The element Potassium is found in what group? a. Group 3 b. Group 1 c. Group The element Magnesium is found in what group? a. Group 8 b. Group 7 c. Group 2

7 46. The element Xenon is found in what group? a. Group 5 b. Group 8 c. Group Atomic number 11 represents what element? a. Sodium b. Carbon c. Hydrogen 48. The fact that some metalloids of the periodic table can be conductors and some metalloids are poor conductors tells us that metalloids are a a. combination of metals and nonmetals b. only a combination of various metals c. combination of metals and noble gases 49. Despite the fact that the element Hydrogen has a valence electron of 1, it has chemical properties very similar to a. lanthanide series b. radioactive elements c. nonmetals 50. Ernest Rutherford produced a model of the atom that proposes electrons circle the nucleus in multi-directions. a. True b. False 51. The discovery of that Modern Atomic Model was in no way a result of scientists working together. a. True b. False 52. Neils Bohr produced a model of the atom where the electrons orbit the nucleus in much the same way the electron cloud shows. a. True b. False 53. Who is considered to the be the father of the periodic table? a. John Dalton b. Rutherford c. Mendeleev

8 54. Between metals and nonmetals, which kind of element generally has more valence electrons overall? a. metals elements b. nonmetals elements c. radioactive elements 55. What could you conclude about the strength and structure of a bond between a nonmetal and metal? a. A bond between a nonmetal and a metal is an ionic bond which produces a bond that is very strong. b. A bond between a nonmetal and a metal is a covalent bond which produces no crystal structure and therefore weak. 56. Why is group 7 the most reactive group on the periodic table? a. Group 7 is very reactive because they are far from fulfilling the Octet Rule. b. Group 7 is very reactive because they are very close to fulfilling the Octet Rule. c. Group 7 is not reactive because they are the Noble Gases. 57. What type of covalent bond is water? a. polar covalent bond b. nonpolar covalent bond 58. What type of covalent bond is oil? a. polar covalent bond b. nonpolar covalent bond 59. Decide which of the following are acids are which are bases: NaOH, HCl, HNO3, KOH, and Ca(OH)2. a. HCl and HNO3 are acids. NaOH, KOH, and Ca(OH)2 are bases. b. NaOH, KOH, and Ca(OH)2 are acids. HCl and HNO3 are bases. c. The chemical formula does not identify whether a substance is an acid or base. 60.