Metrics Conversions SI Units: Length ___, Volume ___, Mass ___, Time___ Kilo- Hecto- Deka- Unit? Deci- Centi- Milli- (k?) (h?) (da?) (?) (d?) (c?) (m?) ex. km hm dam m dm cm mm Convert the following: 4.2hg  ___________dag 0.35cL ___________L 500. mL ___________dL 6900 dg  ___________kg 107m ____________hm 6. .0240 dam ___________mm

Percent Error = Actual-Theoretical x 100 Accuracy & Precision DRAW Accuracy Precision Percent Error Percent Error = Actual-Theoretical x 100 Actual John uses his thermometer and finds the boiling point of ethyl alcohol to be 75o C.  He looks in a reference book and finds that the actual boiling point of ethyl alcohol is 78oC.  What is his percent error? Ans = 3.8% The density of water at 4oC is known to be 1.00 g/mL.  Kayla experimentally found the density of water to be 1.075 g/mL.  What is her percent error? Ans = 7.5% 

Density Density = Mass Volume 1. An iron cube that weighs 7.9kg measures 10cmX10cmX10cm. What is its density? Ans. = .0079 kg/cm3 2. A block has a mass of 20g and measures 2cmX4cmX2cm, will it sink or float? Ans. = sink 3. What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm3. Ans. = 238 cm3 4. Find the mass of 250.0 mL of benzene. The density of benzene is 0.8765 g/mL. Ans. = 2.191 g

Sig Figs Rule 1 – all non-zero digits are significant Rule 2 – all trapped zeros are significant Rule 3 – all zeros to far left of non-zero digits are NEVER significant Rule 4 – all zeros to far right of non-zero digits are ONLY significant if there is a decimal somewhere in the number. How many sig figs? 6.0 x 104 3.905 0.02 x 10-9 700,000 10.0

Sig Figs in Measurement What is the name of this lab equipment? ___________ ___________ ___________ Adding the uncertain digit on the end AND including units…What is the measurement? ___________ ____________ ____________

Sig Figs/Scientific Notation in Calculations Convert the following. Put answer in scientific notation. 3.09 x 104 cg  mg 0.0240 x 10-3L  kL 3. 7100 x 102 dam  hm 4. How many sig figs for #1-3 above? x and / …round answer to smallest # of sig figs given 32x400 = 525/10.=

Factor Label (aka dimensional analysis) Given: 2.54cm = 1 inch, 5280ft = 1 mile 1. There are .621 miles in one km. How many km is it to “Wendy’s” if the distance is 2.3 miles? Hungry yet? Answer: 3.7km 2. A good milk cow can produce 19 gallons of milk per day. If a typical family consumes 0.80 gallons of milk a day, how many cows are needed to provide for 5 families? Answer: .2cows 3. How many feet are in 1742 meters? Answer: 5715 ft The speed limit in Canada on most freeways is 120km/hr. How miles/min. is this? Answer: 1.2 miles/min

Graphing Graph the following using your good graphing rules!! Temperature (x-axis) vs Enzyme Activity (y-axis) Temperature (*C) Enzyme Activity (m/sec) 20 10 30 14 40 18