Physical Science Midterm Review

46.Each inner energy level of an atom has a max number of _ it can hold.

47.It is important to _ when drawing conclusions from scientific information.

60.Elements that make up a compound & exact # of atoms of each element in unit of the compound

44.A variable in an experiment that stays the same is a(n)

34. Particles of matter that make up protons and neutrons are

18. A chemical reaction in which heat energy is released is _

17. Substances that prevent, or slow down, chemical equation is a(n)

9. The oxidation number of an atom is shown with a

58. Fog is an example of a

28.The process of learning more about the natural world is

38. The 3 branches of science are _

59. A chemical bond that occurs when atoms share electrons is a(n) _ bond.

29. A(n) _ chem equation has the same number of atoms of ea element on ea side of the equation

45.A rule or principle that describes what happens in nature is a

30. _ is another name for a homogeneous mixture.

39.In an experiment if the popping of popcorn affected by temp,counting the popped kernels is

52. A particle that moves around the nucleus is a(n)

10. Another term for technology is

40.When designing an experiment, the first step is to

7. The scattering of light by colloids is called

11.If 2 or more substances are combined so each substance can be separated by phys. means

14These must be supported by observations and results fr many investigations & are not absolute

27. Which of the following is a balanced chemical equation?

6.How does the mass of the products in a chemical reaction compare to the mass of the reactants

16.Three examples of physical change are

20. When one element replaces another element in a compound, the reaction is a _ reaction.

3. What is the total number of atoms in the compound Ca(ClO₃)₂?

53. When conducting an experiment, the last step is to _

2. A box-25 cm long, 6 cm wide, and 4 cm high. How many cubic centimeters of water can it hold?

33. A beaker contains 0.32L of water. What is the volume of this water in milliliters?

55. What type of reaction is shown in the following chem equation: NH₃ + HCl -> NH₄Cl

41. How many meters are there in 1,865 cm?

62. In a graph showing temp change of a material over time, temp change is

26. Dot diagrams are used to represent

15. If heat must be added to a chem reaction for the reaction to take place, the reaction is _

49.To evaluate the observations you make, you must use _.

21. To _ means to draw a conclusion based on something you observe.

23. A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is

48. What is the correct formula for magnesium oxide?

25. A chemical symbol represents the _ of an element.

43. Each substance on the left side of the arrow in a chem equation is a _.

31. Atoms of the same element with different numbers of neutrons are called

63. Why do the noble gases NOT form compound readily?

57.A standard for comparison that helps ensure the result is caused by condition being tested

56. The sum of the oxidation numbers in a neutral compound is always

5. Horizontal rows of the periodic table are called

12.Models can do all of the following EXCEPT

51. What kind of chemical bond is formed when an equal exchange of electrons occurs?

42. Each substance to the right of the arrow in a chem equations is a(n)

61. Numbers that precede symbols and formulas in a chemical equation are _

1.When a log burns in a fire,

4. An explanation of an event that is based on repeated observations and experiments is a

50. If 2 atoms of H+ are used as a reactant, how many atoms of H+ must be part of the product?

19. Scientists must be impartial and not base their conclusions on

36. The _ tells you how many electrons an atom must gain, lose, or share to become stable.

8. Variable plotted on the horizontal or x-axis is called

13.The best type of graph to use to show how some fixed quantity is broken down into parts is

54. Elements that are gases, are brittle, and are poor conductors at room temperature are

22. A substance that speeds up a chem reaction without being permanently changed itself is a(n)

37.In a chem formula,the number of each type of atom in the compound is shown by numbers called

32.# of e- needed in the outer energy levels of most atoms for the atom to be chem stable

24.The burning of wood in a campfire that produces heat & light would be both an _ and an _ rxn

35. Limitations of models include