Unit 1 Science Skills

Vocabulary

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Mini Lecture 1.0
Scientific Variables

Should Knows
1. Define: Independent variable, dependent variable, constant,
control
Should Do's
1. Create a testable question and hypothesis for an
experiment.
2. Represent data graphically.

Mini Lecture 1.1

Using Significant Figures

Should Knows

The "Zero Rule"

Addition Rule

Multiplication Rule

Should Do's

1.Express numbers using exponential scientific notation

2. Express calculation results scientifically using significant figures and exponential notation

Rounding Rule for Addition and Subtraction

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(Fewest # of digits after the decimal point)Example: 28.0cm + 23.538cm + 25.86cm = 77.218cm 1) 5.74 + 0.823 + 2.651 = 9.214 = 9.21 (Addition)2) 4.8 - 3.965 = 0.835 = 0.8 (Subtraction)

Rounding Rule for Multiplication and Division

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(The answer must have the same number of significant figures as the measurement with the fewest numbers of significant figures.)Example:24x3.28= 78.72 =79

Driving Questions

How to express significant figures?

What is the Zero Rule?

What is the Addition and Subtraction rounding rule?

1) Calculate

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Calculations (Multiplication Rule)1) 0.064 x 4.31 = 0.27580 2) 0.28 3) 2.8 e -1Calculations (Scientific Notation)1) 5.7259 e 11 / 1.265 e 7 = 4.5264 (11-7=4) e 4(Remember to subtract exponents of division, add exponents of multiplication)2) 4.5263) 4.526 e 4

2) Sig Figs ( Round )

3) Scientific Notation

Mini Lecture 1.2

Metric to Metric Conversions

Should Know's

1) Addition and Multiplication Rule

Should Do's

1) Scientific Notation

Driving Question

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Accuracy- How close a measurement is to the known valuePrecision- How close a measurement is to one anotherMetric System:Liter (Measure in liquids)Meter (Measure in length)Gram (Measure in weight)Kilo- 1000 units (k)Hecto- 100 units (h)Deka- 10 units (da)(To convert to a larger unit, move decimal point to the left or divide)Basic UnitDeci- 0.1 units (d)Centi- 0.01 units (c)Milli- 0.001 units (m)(To convert to a smaller unit, move decimal point to the right or mulitiply)

1) What is the difference between Accuracy and Precision?

2) What are the metric units?

3) What are the Conversion Rules

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Conversion from one unit to another:1) Write the GIVEN value and Unit in the top of the first box2) Write the GIVEN value unit in the bottom of the second box and the unit you are finding in the top of the second box3) *Compare the units then give the LARGEST unit a value of 14) Cancel like units and complete the math. 1000cm/0 1m/100cm= 10.00 M64in/0 2.54cm/1in= 162.56cm

4) What is Density

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Density (g/mL) : Mass (g) / Volume (mL) (per unit volume)

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