8th Grade Chemistry in Review

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Take the quiz again as may times as you need to in order to feel good about your understanding of these concepts.

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Investigation and Experimentation1. A hypothesis is2. The observation or

measurements made in an experiment are called

3. When making a conclusion, scientists

4. Accurate measurements5. The reproducibility of data

refers to

Investigation and Experimentation Continued6. The manipulated variable is an

experiment is the variable that7.The slope of a straight line is calculated

with the equation8. One a line graph, the x-axis is the

labeled with the name of the 9. A bar graph would be best used to graph10. If the data points for a graph form a

smooth curve, the graph shows a11. Which kind of graph has a constant

slope?

Structure of Matter12. In a liquid, the particles13. The distance between particles

in a gas is14. 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 Matter22. An ionic bond is23. 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 Matter27. Ionic compounds form solids by

building up28. 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?

Reactions32. New substances produced in a chemical

reaction are called33. The substances that produce a

chemical reaction are called34. 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 Reactions38. 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

because42. Name three changes of state.43. The parts of a mixture can be separated by44. Describe how you can identify a base by its

pH level.45. When an acid is mixed with water,

The Periodic Table46. Most of the elements in the periodic table are47. The most reactive nonmetals are located in

Group48. 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 Continued52. Compared to metals, nonmetals tend to

be53. Metals are good electrical conductors

because54. Thermal conductivity refers to the

ability of a substance to conduct55. 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?