Question Of The Day

1. Question Of The Day K COloton

2. 8.P.1.1 If a substance is composed of atoms arranged in one particular way, how is this substance best classified? • a. element • b. compound • c. mixture • d. gas

3. Sugar molecules and water molecules are represented by circles of different patterns as shown below.Which best represents sugar dissolved in water?A. B. C. D.

4. Classify each as compound, Mixture, and Element • 1. Sodium (Na) • 2. Sweet Tea • 3. Sucrose (C6H12O6)

5. Which is the best example of a pure substance? A peanuts B milk C gold D air

6. Match the term with the definition • Compound A. Many substances together that are not chemically combined • Mixture B. One atom, pure substance, can not be broken down any further • Element C. Two or more elements chemically combined

7. Which of the following are responsible for forming mixtures? • Atoms • elements • compounds • all of the above

8. Give me an example of: • 1 Element • 1 Compound • 1 Mixture

9. Label the parts of the atom

10. 8.P.1.1 The data table below represents observations made by a scientist during an investigation. Use this table to answer the questions that follow. • A scientist preformed an investigation with samples listed in the data table above. She heated the 2 liquid samples until boiling. After a while, all of the liquid evaporated from Sample 1 and the container was empty. Later, all of the liquid evaporated from Sample 2 and a colorless powder remained. • 1. Based on the information presented in the data table, which term best describes Sample 1? • a. atom b. element • c. mixture d. compound.

11. 8.P.1.1 The data table below represents observations made by a scientist during an investigation. Use this table to answer the questions that follow. • A scientist preformed an investigation with samples listed in the data table above. She heated the 2 liquid samples until boiling. After a while, all of the liquid evaporated from Sample 1 and the container was empty. Later, all of the liquid evaporated from Sample 2 and a colorless powder remained. • 2. Which term best describes Sample 2? • a. atom b. element c. mixture d. compound

12. 3. Which best explains why silver nitrate (AgNO3) is a compound? • a. Silver nitrate is a colorless powder • b. Silver nitrate does not chemically react with water. • c. Silver nitrate forms a colorless liquid when mixed with water. • d. Silver nitrate forms when three elements chemically combine.

13. Which best describes a compound? A. the simplest form of matter B. an element that has changed state C. a physical mixture of chemicals and elements D. a chemical combination of two or more elements

14. How can mixtures best be described? A. made of one element B. made of different elements that are all chemically bonded together C. made of different elements that are not all chemically bonded together

15. 8.P.1.2 In the current model of the Periodic Table of Elements, the elements have been placed in groups or families. Why have the elements been organized in such a way? • a. Elements in each group have similar densities. • b. Elements in each group all have similar boiling points. • c. Elements in each group have similar physical and chemical properties. • d. Elements in each group have the ability to chemically react with the other elements within that group.

16. Label the parts of the element

17. Which pair of elements has the most similar properties? A. Li and B B. I and Ca C. K and He D. N and P

18. How are groups on the Periodic Table arranged? • Classified based on Atomic Number • Classified based on similar properties • Classified based on Atomic Mass • Classified based upon reactivity

19. As the elements on the periodic table move from left to right What happens to reactivity? • A. INCREASES • B. DECREASES

20. Which Group is most reactive on the periodic Table? • Halogens • Noble Gases • Alkali Metals • Transition Metals

21. What category of elements is found between the metals and nonmetals on the periodic table?A. synthetic B. metalloids C. radioactive D. noble gases

22. Which Group is Least Reactive on the periodic Table? • Oxygen Family • Transition Metals • Alkaline Earth Metals • Noble Gases

23. Which elements are most likely to react in the same manner in a chemical reaction? A. elements in the same group B. elements in the same period C. elements with similar atomic masses

24. Who is the father of our modern day periodic table? • A. Gregor Mendel • B. John Dalton • C. Dmitri Mendeleev • D. Rutherford

25. 8.P.1.3 A science teacher mixes calcium chloride and vinegar in a test tube. He passes the test tube around for his students to feel. The students notice that the test tube is hot. The science teacher asks the students to decide if the mixing of the two chemicals involved a physical or chemical change. He also asks the students to justify their answer. Which student gave the correct response? • a. Student 1: The change was physical because a temperature change occurred. • b. Student 2: The change was chemical because a temperature change occurred. • c. Student 3: The change was physical because the two chemicals mixed • d. Student 4: The change was chemical because the two chemicals mixed

26. What happens to water molecules during the boiling process? • A. They move faster and move farther apart as they absorb heat. • B. They move faster and remain close together as they absorb heat. • C. They move more slowly but move farther apart as they loseheat. • D. They move faster and move farther apart as they lose heat.

27. Which shows one example of a physical change and one example of a chemical change? • A. boiling water and melting wax • B. rusting iron and baking a cake • C. dissolving powder and shredding paper • D. freezing water and burning coal

28. A student took a 3 cm magnesium strip and held it towards a Bunsen burner using tongs. A bright white flame was produced. What type of change occurred? A. change of state B. physical change C. chemical change D. change from acid to base

29. Which of the following is Not a Heterogeneous mixture: A. Tossed Salad B. Air C. Granite D. Iced Tea

30. Which of the following is a homogeneous mixture. A. Steel B. Salad C. Granite D. Iced Tea

31. 8.P.1.4 Sodium and chlorine can react chemically to form table salt. How does the mass of the table salt formed in this reaction compare to the mass of the sodium and chlorine before the reaction takes place? • a. The mass of the table salt formed is less than the sodium and chlorine. • b. The mass of the table salt formed is greater that the sodium and chlorine. • c. The mass of the table salt formed is twice the mass of the sodium and chlorine. • d. The mass of the table salt formed is the same as the mass of the sodium and chlorine.

32. 46 grams 71 grams ??? grams • 8.P.1.4 A scientist performed an investigation using the following substances: • Based on the investigation and the packing of sample C, which measurement would most likely be the mass of the crystal? • a. 25 grams b. 71 grams • c. 110 grams d. 117 grams • Constructed response: Explain your choice based on the law of conservation of mass and evidence from the presented data.

33. 8.P.1.4 A teacher conducted an investigation in class to determine if the contents of a closed container either loses or gains mass after a chemical reaction takes place. He placed 40 mL of water into a bottle, added one alka-seltzer tablet and quickly closed the bottle with a balloon. The data table shows observations made before the reaction: • After a while, bubbles started to appear and the balloon inflated as shown in figure 2. • Once the contents of the container completely reacted, the teacher measured the mass of the entire system shown in figure 2. He shared his results with the class. Which statement best describes the mass and explanation the teacher may have given? • a. 140 grams because the gas produced in the water added more mass to the container • b. 120 grams because the gas produced in the water made the container lighter • c. 134 grams because the number of atoms before the reaction is the same number of atoms after the reaction • d. 134 grams because nothing could get into the container and nothing could get out of the container

34. Match the following chemical formula with its household name A. H2O Vinegar B. CO2 Hydrochloric Acid C. C12H22011 Oxygen D. NaCl Baking Soda E. O2 Bleach F. NaClO Table Salt G. HCl Ammonia H. NH3 Carbon Dioxide I. NaHCO3 Water J. HC2H3O2 Sucrose (Sugar)

35. To represent the distribution of water on earth, a teacher filled a 2-liter bottle with 2000 mL of water. She then made a mark at the 1944 mL point. What should be written at the 1944 mL level to distinguish the type of water to that point? • Water from glaciers & icebergs • Ground water • Ocean water • Water from ponds, rivers, lakes & streams

36. When two different Objects are joined • Adhesion • Cohesion • Capillary Action • Buoyancy

37. When two of the same molecules are joined; what is that? • A. Polarity • B. Cohesion • C. Adhesion • D. Universal Solvent

38. This Picture shows that water is? Universal Solvent Polar Cohesive Dense

39. Water is Polar and Dissolves other polar materials this makes it what? • Adhesive • Cohesive • Universal Solvent • Polar

40. How would excessive increases in nitrate and phosphorous concentration affect freshwater systems? • It would cause excessive algal blooms. • It would cause increased dissolved oxygen. • It would cause increased water clarity. • It would cause extremely cold water.

41. Water that has High Turbidity has high or Low Dissolved Oxygen?

42. If your community was planning to build a new sanitary landfill, what would be the most important environmental consideration in locating the landfill? • cost of the land • location of the groundwater • proximity to an industrial park • accessibility to a major highway

43. How are estuaries connected to oceanic organisms? • Estuaries provide a nursery grounds for oceanic organisms • Estuaries provide sunlight for oceanic organisms. • Estuaries provide primary food for oceanic organisms. • Estuaries provide excess dissolved oxygen for oceanic organisms.

44. If a body of water has high turbidity levels, what can most likely be concluded? A It has a low pH.B It is unsafe to drink. C It is too hot to drink. D It contains a lot of chemicals.

45. Which best determines the health of a lake used as a source of freshwater? A. its depth and width B. its temperature and pH C. its location and depth D. its temperature and depth

46. Which of these organisms is a producer in a marine ecosystem? A fish B gull C algae D worm

47. Which source of water pollution includes oil and gasoline discharge from automobiles and storm sewer drainage? A agriculture B bacteria C sedimentation D urban runoff

48. Where is most of the fresh surface water located on Earth? A. Oceans B. Ice Caps C. Lakes D. Glaciers

49. Which would be the best way for humans to conserve large amounts of water during a drought? A. Install new high flow toilets B. Bathe only once a week C. Limit drinking water in restaurants D. Limit use of outdoor sprinkler systems

50. Which has the greatest long-term impact on local water availability? • A. Runoff • B. Weather • C. Climate • D. Pollution