Chemistry – Aug 29, 2018 P3 Challenge –

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Presentation transcript:

Chemistry – Aug 29, 2018 P3 Challenge – cm P3 Challenge – What is the length of this bean? (Report your answer with the proper number of decimal places/sigfigs.) Visit the board for a close up HMK Check: Sig fig Worksheet. Safety Contracts needed: Get out Sigfig WS for Hmk Check

Objectives and Agenda Objectives Agenda To practice measuring length, mass and volume To learn about measuring with sigfigs from the equipment Agenda Homework Review Measurement Lab Activity

Homework Review Sigfig Worksheet Answers: Check yours and ask questions for clarification. 1. a) 3 b) 4 c) 3 d) 2 e) 2 f) 1 g) 3 h) 4 i) 5 2. a) 5.49 x 106 m or 5,490,000 m b) 0.0134793 mL c) 31, 950 cm2 d) 192.67 m2 e) 790 cm f) 3.89278 x 108 J or 389,278,000 J g) 225,834.8 cm3

Homework Review Sigfig Worksheet Answers: Check yours and ask questions for clarification. 3. a) 48,825 cm2  49,000 cm2 or 4.9 x 104 cm2 Round to 2 sigfig b) 3.134 kg/L  3.1 kg/L Round to 2 sigfig c) 12.29166666 L/s  12.3 L/s Round to 3 sigfig d) 166,525.2 cm2  170,000 cm2 or 1.7 x 105 cm2 Round to 2 sigfig e) 40.763492 m3  41 m3 Round to 2 sigfig f) 3.129555 g/cm3  3.1296 g/cm3 Round to 5 sigfig

Homework Review Sigfig Worksheet Answers: Check yours and ask questions for clarification. 4. a) 90.225 J  90.2 J Round to 1 d.p. b) 0.0064 m  0.006 m Round to 3 d.p c) 934 g  900 g Round to hundreds place d) 31.0565 kPa  31.1 kPa Round to 1 d.p. e) 277.68 dL  278 dL Round to ones place f) 1794 kg  1790 kg Round to tens place

Lab Activity Overview A. Measuring Length – Using three different types of rulers: 10 cm, 1 cm and 1 mm gradations. B. Measuring Mass – Using three different types of balances: spring, triple beam, and electronic. For both spring and triple beam you may need to use a subtraction method to find the mass of an object. Subtracting a background reading is a very common lab procedure not just for measuring mass. C. Measuring Liquid Volume – Liquids in graduated cylinders or beakers. D. Measuring Solid Volume – First by measuring dimensions and using geometry. Second by using water displacement and another subtraction process. Work in pairs, but split the measurement duties, and get both opinions for each.

Exit Slip - Homework Exit slip – Put the room back in order the way you found it. If it’s not done, no one gets credit for the exit slip. What’s Due? (Pending assignments to complete.) Measurement Lab Activity – will finish next time What’s Next? (How to prepare for the next day) Finish the Measurement Lab, Start using metric units Read p12-15