Physical Science Midterm Review

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

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

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

10. Another term for technology is

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

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

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

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

1.When a log burns in a fire,

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

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

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

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

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

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

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

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

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

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

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

48. What is the correct formula for magnesium oxide?

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

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

12.Models can do all of the following EXCEPT

7. The scattering of light by colloids is called

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

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

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

26. Dot diagrams are used to represent

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

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

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

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

35. Limitations of models include

16.Three examples of physical change are

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

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

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

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

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

5. Horizontal rows of the periodic table are called

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

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

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

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

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

58. Fog is an example of a

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

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

38. The 3 branches of science are _

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

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

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

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

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

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

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

30. _ is another name for a homogeneous mixture.

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

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

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

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

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