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OATMEAL TREATS Combine together the following ingredients: some butter some sugar a little salt a lot of flower a bunch of nuts a whole lot of oatmeal a little baking powder Mix well, heat up the oven, and bake for a long time What is wrong with this recipe? Are measurements important? METRIC SYSTEM Developed in 1791 and is currently used almost everywhere in the world, except the US. Our scientists, hospitals, researchers, etc use this system. Système International d'Unités International System of Units or SI Based on the number 10 Prefixes, Numbers and Symbols 1000 100 10 0.1 How to remember the staircase? 0.01 0.001 King Henry Doesn’t Usually Drink Chocolate Milk LENGTH is the distance between 2 points. The standard unit is the meter. 1m = 39.4 inches Measuring instrument meter stick ruler Smaller objects are measured using the cm. 2.5cm =1 inch 100cm = 1m Even smaller objects are measured using the mm. Long distances = km 1km = 1000m 1 km = .62 miles How many miles would you run in a 5km race? Standard unit is the liter = l or L. Small amounts = mL _______mL = 1 L The amount of space an object occupies. LARGE amounts = kl ________L = 1 kl How many kl is 3250L ? 3.250kl What instrument is used to find the volume of a liquid? graduated cylinder Graduated cylinder When measuring liquid volume it is important to read the graduated cylinder correctly. You eye should be level with the top of the liquid and you should read the bottom of the meniscus. You would read this as ________ How may mL is showing in these graduated cylinders? Volume of rectangular solids Width = 5cm Height = 4cm length 10cm Formula: V = length x width x height Find the volume of the box. 200cm3 VOLUME What would the volume of a cube that has the l = 1cm, w = 1cm, and the h = 1cm be? 1cm3 A 1cm3 hollow cube holds __ml of H2O, therefore 1000cm3 = ____ ml or 1 ___ MASS: The amount of matter in an object. Instrument used to find mass: Triple beam or electronic balance Standard unit is the kilogram kg 1 kg = 2.2 lbs Calculate your weight in kg. __________kg Common unit - the gram. A large paper clip masses about 1g. Extremely small items are massed using mg for the unit. 1 g = _____ mg. How many mg would = 1kg? ____________mg What is the mass on the balance? Triple Beam Balance The weight of a can of Diet DEW is? http://genchem.rutgers.edu/bal3b2.html ______________________ Weight A measure of attraction between two objects due to gravity Standard unit = Newton (N) A 1kg object is pulled to Earth at a rate of 9.8 newtons, so the weight would = 9.8N. Weight = mass x 9.8 newtons (on Earth at sea level). Note gravitational pull would be less on a mountain than at sea level, b/c you are farther away from the center of Earth. Calculate your weight. Use your mass from the mass page. DENSITY The amount of matter that occupies a space D = mass (g) volume (cm3) 48 g 2cm 4cm 3cm V= 2cm x 3cm x 4cm V= _______ D= 19.3 g/cm3 The density of water is 1.0g/cm3 TIME the interval between two events Standard unit is the __________ Common units are minutes and hours TEMPERATURE Unit Absolute zero Water freezes 273º Kelvin K 0 Celsius ºC -273º Fahrenheit ºF -459.67º Water boils 212º Conversion Formulas [°C] = [K] − 273 [K] = [°C] + 273 [°F] = [°C] · 9/5 + 32 [°C] = ([°F] − 32) · 5/9