8 th Grade Chemistry in Review Take this quiz and look at your score. Reflect. Take the quiz again as may times as you need to in order to feel good about your understanding of these concepts. Remember that your attitude can determine altitude. You CAN do it!!!

Investigation and Experimentation 1. A hypothesis is 2. The observation or measurements made in an experiment are called 3. When making a conclusion, scientists 4. Accurate measurements 5. The reproducibility of data refers to

Investigation and Experimentation Continued 6. The manipulated variable is an experiment is the variable that 7.The slope of a straight line is calculated with the equation 8. One a line graph, the x-axis is the labeled with the name of the 9. A bar graph would be best used to graph 10. If the data points for a graph form a smooth curve, the graph shows a 11. Which kind of graph has a constant slope?

Structure of Matter 12. In a liquid, the particles 13. The distance between particles in a gas is 14. What is the chemical symbol for silver? 15. Which elements combine to form the compound represented by the formula KCl? 16. What is the atomic number of copper?

More on The Structure of Matter 17. Which group in the periodic table does the element calcium belong to? 18. What is the atomic number of krypton? 19. The three particles that make up an atom are 20. Which particles in an atom account for nearly all the atom’s mass? 21. A substance made of two or more elements chemically combined in a set ratio is

Still More on The Structure of Matter 22. An ionic bond is 23. How can an atom best be described? 24. Which particles of an atom move around the nucleus, forming a cloudlike region of negative charge? 25. An atom’s valence electrons are those electrons 26. The atoms in a molecule of water are joined by

A Final Word on The Structure of Matter 27. Ionic compounds form solids by building up 28. An ionic compound forms a solid with an orderly, three-dimensional pattern called a(an) 29. Name three characteristics of molecular compounds. 30. Which change in state involves a decrease in molecular motion? 31. Which state of matter has definite volume but not shape of its own?

Reactions 32. New substances produced in a chemical reaction are called 33. The substances that produce a chemical reaction are called 34. Name an evidence that a chemical reaction has occurred. 35. The number of reactant atoms is __________the number of atoms in the product. 36. How many atoms of oxygen are in a molecule of CO2? 37. When new chemical bonds form,

Wrapping Up Reactions 38. In an endothermic reaction, ______________. Example? 39. In an exothermic reaction, _____________. Example? 40. Why does an exothermic reaction require activation energy? 41. A change of state is a physical change because 42. Name three changes of state. 43. The parts of a mixture can be separated by 44. Describe how you can identify a base by its pH level. 45. When an acid is mixed with water,

The Periodic Table 46. Most of the elements in the periodic table are 47. The most reactive nonmetals are located in Group 48. Elements that have some properties of metals but also some properties of nonmetals are classified as 49. The atomic number of sodium is 11. The nucleus of every atom contains this number of 50. The atomic number of hydrogen is 1. The nucleus of the isotope hydrogen-2 contains 51. Two atoms with different atomic numbers are

The Periodic Table Continued 52. Compared to metals, nonmetals tend to be 53. Metals are good electrical conductors because 54. Thermal conductivity refers to the ability of a substance to conduct 55. Given an example of an unknown metal, the best way to identify the metal would be 56. Why do elements within the same group tend to have similar chemical properties?

Chemistry of Living Things 57. How many electrons does a carbon atom have available to form chemical bonds? 58. What kind of bonds do carbon atoms form? 59. How can you identify an organic compound? 60. What is a polymer? 61. Give an example of a polymer? 62. Give an example of a monomer that makes up the polymer you chose? 63. What are the building blocks of nucleic acids? 64. Living organisms can best be described as having ____(#) elements to make up their molecules. Name as many as you can. 65. Which organic molecules does your body use to build and repair body parts and to regulated all cell activities?

Concluding Chemistry in Review 62. Give an example of a monomer that makes up the polymer you chose? 63. What are the building blocks of nucleic acids? 64. Living organisms can best be described as having ____(#) elements to make up their molecules. Name as many as you can. 65. Which organic molecules does your body use to build and repair body parts and to regulated all cell activities?