Objective of the day: To understand how to measure using a graduated cylinder, triple beam balance and a ruler

Daily Question # 1 What is the volume measurement in the following diagram?

Back to the Basics

Science Lab Equipment

Graduated Cylinder Measure about 26.1 mL

d) 16.9 e) 76.0 f) 5.3 g) 32.0 h) 3.5 i) 47.0

Scale Weigh the object

1) 622.95 2)153.69 3) 200.55

Ruler Measure the length of the object If extra time have groups check each other’s measurements

SI Units International System of Units (SI)

Metric Prefixes King Henry Died One December Cold Morning OR King Henry Died DRINKING Chocolate Milk , STAIR STEPS?

BIGGER SMALLER Show them the King Henry….then show them how to more from the left to the right…

1000 k BIG 100 h 10 dk 1 .1 d .01 c .001 m SMALL BASE (m, g, L) kilo hecto 10 dk deca 1 BASE (m, g, L) .1 d deci .01 c centi .001 m milli SMALL

How do you convert between metric units? Determine whether you are going up the ladder or down the ladder. If you go up, move the decimal to the left. If you go down, move the decimal to the right. Use the ladder to determine how many places to move the decimal. The number of steps on the ladder is equal to the number of decimal places. Write the correct units with your answer.

Practice Problems 1. 0.7834 mg = ____________ g 2. 100 cm = ______________ m 3. 345,000 kg = ____________ g 4. 2.5 mm = _______________ hm 5. 3.46 cg = ________________ mg 6. 1.00 km = _______________ cm

Scientific Notation Method of writing very small or very large numbers A positive exponent means the decimal moved to the left. A negative exponent means the decimal moved to the right

Scientific Notation 602,200,000,000,000,000,000,000 = ? Step 1: Make the Coefficient less than 10 and more than 1. Step 2: Find out how many places over the decimal has to move to give you the number in step 1.

Scientific Notation 5,300,000 = ? 4,302,000,000 = ? -24,500 = ? .000034 = ? -.0000007 = ?

Scientific Notation 5.3 x 104 = ? 7.02 x 108 = ? -3.21 x 103 = ?

Scientific Notation Addition and Subtraction: Make the exponents the same number Add/Subtract the coefficient 5.3x102 + 2.6x103 = 5.3x102 + 26.x102 = 31.3x102= 3.13x103

Scientific Notation Multiplication and Division Add or Subtract exponents Multiply or Divide coefficients Multiply Divide 5.2x102 x 4.8x104 = 5.0x104 ÷ 2.5x103= (5.2 x 4.8) x10(2 + 4) (5.0 ÷ 2.5) x10(4-3)= 24.96x106 2.0x101 2.496x107

Scientific Notation 5.6x104 + 4.3x102 = ? 4.0x106 – 8.3x105 = ?

Derive a relationship between the following 17 = 2 300 = 1 345 = 3 1000 = 1 1001 = 4 100.0 = 4

Accuracy vs. Precision Accuracy: How close to the real value Precision: How close a series of measurements are to each other accuracy of tools

Significant Figures Rounding Numbers: -Round up if the digit to the right is between 5-9 59.48  59.5 -Drop the number to the right if it’s between 0-4 3.84  3.8 Significant Figures Tell You What Number To Round To!

Significant Figures All Non-zero numbers (1,2,3,4,5,6,7,8,9) are significant Zeros – Front of number are NEVER significant 0.0071, 0.42, .000099 all have 2 sig. figs Middle of number are ALWAYS significant 7003, 40.79, 1.503 all have 4 sig. figs End are SOMETIMES significant At end AFTER decimal, ALWAYS significant 36.00, 1.010, 9.000 all have 4 sig figs At end BEFORE decimal, NEVER significant 300, 7000, 20000 all have 1 sig fig

Significant Figures 5.30 = ? 76009.0 = ? 1900 = ? .0000000891 = ?

Significant Figures Addition and Subtraction Match the number with the least number of decimals Ex: 13.21 + 4.1 = 17.3 13.21 + 4.100 = 17.31 13.21 + 4 = 17 Multiplication and Division Match value with fewest number of sig figs Ex: 2.00 x 11 =22 2.00 x 11.0 = 22.0 2 x 11 = 20