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# 1 0900 Final Review. 2 Lab stuff – what is it? 3.

## Presentation on theme: "1 0900 Final Review. 2 Lab stuff – what is it? 3."— Presentation transcript:

1 0900 Final Review

2 Lab stuff – what is it?

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1. 950100 2. 9501 3. 950.1 4. 95.01 5. 9.501 6. 0.9501 7. 0.0000009501 Counting Sig Figs & Proper Scientific Notation

6 Metric System SI Units – what are they?? Base unit Conversions – –Dimensional Analysis –Move the decimal – 556.02g = __________ hg –.00911m = __________ mm

7 Lab stuff – what is it?

8 Mass Measurements What kind is this? Are measurements direct or indirect? What is the estimated digit?

9 What is the Mass?

10 Mass Measurements What kind is this? Are measurements direct or indirect?

11 Volume Displacement – what is this? Direct measurement? What works best when??

12 Volume Measurements – What are the increments?

13 What is the Volume?

14 What is the Volume?

What is the volume of the rock? 15

16 Glassware to measure volume – what are they?

17 What is the volume?

18 Pipets What kinds are these? How do you know what the volume is? How do you know what the increments are?

19 Measuring Length

Measuring with a Caliper What is the measurement? 21

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Temperature – reading a thermometer 24

25 Ratios & Proportions Ratios can be written 3 different ways A ratio of 3 boys to 5 girls can look like: 3 to 53 3 : 5 3/5 Is the order important??

26 What is the ratio of PURPLE dishes to Yellow dishes?

27 Proportions

28 Calculate the mean, mode, median, range and Standard Deviation of: 65, 91, 65, 84, 87, 95

29 Probability: If you have a deck Of 52 cards, what is The probability of Selecting a 1 of hearts? What is the sample space?

30 Periodic Table – What info can we get from it? Periods Groups Metal Nonmetals Metalloids

31 Elements Compounds Gold

32 Homogenous Mixtures Heterogeneous Mixtures

33 Acids and Bases pH – what is it? pH scale – what is it?

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35 Parts of an Atom

36 Bonds – Ionic and Covalent

37 Solutions 25.0 g of sugar is added to 125 mL of hot coffee. What is the %concentration? 1.5g of powdered Tang to water for a total solution of 50mL. What is the % concentration?

38 Types of Solutions

39 Types of Solutions

40 Osmosis or Diffusion?

41 Osmosis or Diffusion?

42 Direction of Diffusion – what is the evidence?

43 Microscope : –Parts –Field of View –How to use –What to use when

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47 Which ball has the greatest Potential Energy? Why? Which ball would have the least Potential Energy? Why?

48 Which ball would have the least Potential Energy? Why?

49 Which ball would have the greatest Kinetic Energy? Why? Which ball would have the least Kinetic Energy? Why?

50 Which ball would have the greatest Kinetic Energy? Why? Which ball would have the least Kinetic Energy? Why?

51 Simple Machines – what do they do for us? Levers -

52 Physics Velocity vs. Speed Acceleration Mass vs. weight Force, work Newtons

53 Where are the load, fulcrum & effort?

Scientific Method What are the 4 steps? What is an hypothesis?

Graphs Dependent Independent Extrapolation Interpolation

Chemical or Physical Change?

Density = mass/volume 57

Significant Figures - Why do we use them? How to count? 58 1. Always count nonzero digits Example: 21 has two significant figures, while 8.926 has four 2. Never count leading (placeholder) zeros Example: 021 and 0.021 both have two significant figures 3. Captive zeros - Always count zeros which fall somewhere between two nonzero digits Example: 20.8 has three significant figures, while 0.00104009 has six 4. Count trailing zeros if and only if the number contains a decimal point Example: 210 and 210000 both have two significant figures, while 210. has three and 210.00 has five

59 How many of the following numbers have 4 significant figures? 3.003 16.00 0.004 1.24 x 10 4 0.001204 a) 4 b) 3 c) 5 d) 2 e) 1 How many significant figures are in the number 0.00246? a) four b) three c) five d) two e) six

Number of Sig Figs 60 0.092067_____ sig. figs. 0.092______sig. figs. 0.0920______ sig. figs.

61 SIGNIFICANT FIGURES Addition & Subtraction

62 Calculate the following to the correct number of significant figures. 1.00 + 12.3 = _____ a) 11 b) 13.3 c) 11.299 d) 13 e) 11.2 Calculate the following to the correct number of significant figures. 10.23 + 4.355 = _____ a) 14.585 b) 14.58 c) 15 d) 14.59 e) 14.6

63 Calculate the following to the correct number of significant figures. 212.1 - 89.342 = _____ a) 122.76 b) 122.8 c) 122.758 d) 123 e) 122.7

64 SIGNIFICANT FIGURES Multiplication and Division

65 Calculate the following to the correct number of significant figures. 2.301 / 0.0120 = _____ a) 191.7 b) 191.75 c) 191.8 d) 191 e) 192 Calculate the following to the correct number of significant figures. 2.34 / 0.12 = _____ a) 19.5 b) 19 c) 0.28 d) 0.281 e) 2.0 x 10 1

66 Calculate the following to the correct number of significant figures. 81.25 x 0.0014 = _____ a) 0.114 b) 0.1 c) 0.1137 d) 0.1138 e) 0.11

Rounding Sig Figs 67 Round to 2 sig figs Round to 3 sig figs 1.235 0.0025653 205.203 3463200 230.940 0.002030

68 A crucible is known to weigh 24.332 g. Three students in the class determine the weight of the crucible by repeated weighings on a balance. Using the following information, which student has done the most precise determination? Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 A 24.8 24.9 24.8 24.9 24.8 B 24.8 24.0 24.2 24.1 24.3 C 24.5 24.1 24.5 24.1 24.3 a) Student C has done the most precise work. b) Student A has done the most precise work. c) Student B has done the most precise work.

69 Consider the data obtained for the length of an object as measured by three students. The length is known to be 14.54 cm. Which of the conclusions summarizes the data? Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 A 14.8 14.1 14.5 14.6 14.2 B 14.5 14.6 14.6 14.5 14.7 C 14.3 14.4 14.4 14.3 14.3 a) Student A has done the most precise work and student C the most accurate. b) Student B has done the most precise work and student C the most accurate. c) Student B has done the most precise work and student A the most accurate. d) Student C has done the most precise work and student A the most accurate. e) Student C has done the most precise work and student B the most accurate.

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Using the 4X objective, Field of View is 4mm What is the approximate diameter of the pollen grain? 71

Using the 10X objective, Field of View is 2mm What is the approximate length of the ant? 72

Cross section or Long section? 73

Cross section or Long section? 74

Diffusion or Osmosis?

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