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0900 Final Review

Metro community College8/9/2011

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Lab stuff – what is it?

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Lab stuff – what is it?

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Lab stuff – what is it?

1. 9501002. 95013. 950.14. 95.015. 9.5016. 0.95017. 0.0000009501

Counting Sig Figs & Proper Scientific Notation

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Metric System

SI Units – what are they??Base unitConversions –

– Dimensional Analysis– Move the decimal– 556.02g = __________ kg– .00911m = __________ mm

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Lab stuff – what is it?

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Mass Measurements

• What kind is this?• Are measurements direct or indirect?• What is the estimated digit?

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What is the Mass?

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Mass Measurements• What kind is this?• Are measurements

direct or indirect?

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Volume

• Displacement – what is this?

• Direct measurement?

• What works best when??

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Volume Measurements – What are the increments?

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What is the Volume?

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What is the Volume?

What is the volume of the rock?

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Glassware to measure volume – what are they?

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What is the volume?

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Pipets• What kinds are

these?• How do you

know what the volume is?

• How do you know what the increments are?

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Measuring Length

Measuring Length

Measuring with a CaliperWhat is the measurement?

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Temperature – reading a thermometer

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Ratios & Proportions

• Ratios can be written 3 different ways

A ratio of 3 boys to 5 girls can look like:• 3 to 5• 3 : 5 • 3/5

• Is the order important??

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What is the ratio of     PURPLE dishes to Yellow dishes?

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Proportions

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Calculate the mean, mode, median, range and Standard Deviation of:

65, 91, 65, 84, 87, 95

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Probability:

• If you have a deckOf 52 cards, what isThe probability ofSelecting a 1 of hearts?

What is the sample space?

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• Periodic Table – What info can we get from it?

PeriodsGroups

MetalNonmetalsMetalloids

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• Elements• Compounds

Gold

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• Homogenous Mixtures• Heterogeneous Mixtures

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Acids and Bases

• pH – what is it?• pH scale – what is it?

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Parts of an Atom

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Bonds – Ionic and Covalent

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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?

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Types of Solutions

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Types of Solutions

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Osmosis or Diffusion?

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Osmosis or Diffusion?

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Direction of Diffusion – what is the evidence?

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Microscope

– Parts– Field of View– How to use– What to use when

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

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

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

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

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Simple Machines – what do they do for us?

Levers -

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Physics

• Velocity vs. Speed

• Acceleration

• Mass vs. weight

• Force, work

• Newtons

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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

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Significant Figures - Why do we use them? How to count?

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1. Always count nonzero digitsExample:  21 has two significant figures, while 8.926 has four

2.  Never count leading (placeholder) zerosExample:  021 and 0.021 both have two significant figures

3.  Captive zeros - Always count zeros which fall somewhere between two nonzero digitsExample:  20.8 has three significant figures, while 0.00104009 has six

4.  Count trailing zeros if and only if the number contains a decimal pointExample:  210 and 210000 both have two significant figures, while 210. has three and 210.00 has five

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How many of the following numbers have 4 significant figures?

3.003 16.00 0.004 1.24 x 104 0.001204a)   4b)   3c)   5d)   2e)   1

How many significant figures are in the number 0.00246?

a)   fourb)   threec)   fived)   twoe)   six

Number of Sig Figs

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0.092067 _____ sig. figs.

0.092 ______sig. figs.

0.0920 ______ sig. figs.

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SIGNIFICANT FIGURESAddition & Subtraction

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Calculate the following to the correct number of significant figures.

1.00 + 12.3 = _____

a)   11b)   13.3c)   11.299d)   13e)   11.2

Calculate the following to the correct number of significant figures.

10.23 + 4.355 = _____

a)   14.585b)   14.58c)   15d)   14.59e)   14.6

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Calculate the following to the correct number of significant figures.

212.1 - 89.342 = _____

a)   122.76b)   122.8c)   122.758d)   123e)   122.7

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SIGNIFICANT FIGURESMultiplication and Division

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Calculate the following to the correct number of significant figures.

2.301 / 0.0120 = _____

a)   191.7b)   191.75c)   191.8d)   191e)   192

Calculate the following to the correct number of significant figures.

2.34 / 0.12 = _____

a)   19.5b)   19c)   0.28d)   0.281

e)   2.0 x 101

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Calculate the following to the correct number of significant figures.

81.25 x 0.0014 = _____

a)   0.114b)   0.1c)   0.1137d)   0.1138e)   0.11

Rounding Sig Figs

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Round to 2 sig figs

Round to 3 sig figs

1.2350.0025653

205.2033463200230.940

0.002030

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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 5A 24.8 24.9 24.8 24.9 24.8B 24.8 24.0 24.2 24.1 24.3C 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.

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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 5A 14.8 14.1 14.5 14.6 14.2B 14.5 14.6 14.6 14.5 14.7C 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 4mmWhat is the approximatediameter of thepollen grain?

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Using the 10X objective, Field of View is 2mmWhat is the approximatelength of the ant?

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Cross section orLong section?

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Cross section orLong section?

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Diffusion or Osmosis?