Measuring Matter.

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Presentation transcript:

Measuring Matter

Measuring Matter Mass – is the amount of matter in an object Use a balance to measure Units are grams (g), kilograms (kg) Add together the masses

T. Trimpe 2008 http://sciencespot.net/

English vs. Metric Units 1 pound = 453.6 grams Which is larger? 1. 1 Pound or 100 Grams 2. 1 Kilogram or 1 Pound 3. 1 Ounce or 1000 Milligrams 100 kilogram = 220 pounds 1 ounce of gold = 28,349.5 milligrams

Metric Units kg g cg mg Kilogram Prototype Mass refers to the amount of matter in an object. The base unit of mass in the metric system in the kilogram and is represented by kg. Standard: 1 kilogram is equal to the mass of the International Prototype Kilogram (IPK), a platinum-iridium cylinder kept by the BIPM at Sèvres, France. Metric Units 1 Kilogram (km) = 1000 Grams (g) 1 Gram (g) = 1000 Milligrams (mg) Click the image to watch a short video about mass. Which is larger? A. 1 kilogram or 1500 grams B. 1200 milligrams or 1 gram C. 12 milligrams or 12 kilograms D. 4 kilograms or 4500 grams Kilogram Prototype Image - http://en.wikipedia.org/wiki/Kilogram

_______ + ______ + _______ = ________ g Measuring Mass We will be using triple-beam balances to find the mass of various objects. The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right-side of the scale to match up. Once you have balanced the scale, you add up the amounts on each beam to find the total mass. What would be the mass of the object measured in the picture? _______ + ______ + _______ = ________ g Top Image: http://www.southwestscales.com/Ohaus_Triple_Beam_750-SO.jpg Bottom Image: http://www.regentsprep.org/Regents/biology/units/laboratory/graphics/triplebeambalance.jpg

Measuring Mass – Triple-Beam Balance 1st – Place the film canister on the scale. 2nd – Slide the large weight to the right until the arm drops below the line. Move the rider back one groove. Make sure it “locks” into place. 3rd – Repeat this process with the top weight. When the arm moves below the line, back it up one groove. 4th – Slide the small weight on the front beam until the lines match up. 5th – Add the amounts on each beam to find the total mass to the nearest tenth of a gram. Click here to try an online activity.

Measuring Matter Volume – is the amount of space occupied by an object Liquids – measure using a graduated cylinder and read the mark at the bottom of the meniscus Units are mL or L

Measuring Matter Volume Rectangular solids / cubes – measure length x width x height Units are the unit of distance cubed cm3 or m3

Measuring Matter Volume Irregular shaped objects – fill a graduated cylinder to a certain amount put the object in and find the volume difference If the starting volume was 50 mL and the new volume is 65 mL, what is the volume of the object? 15 mL or 15 cm3 Note: 1 mL = 1 cm3

Density MASS Density – the measure of mass in certain amount of space Units are the unit of mass/the unit of volume g/cm3 or g/mL MASS DENSITY VOLUME

Which is more dense? The box on the left is more dense because it has more stuff in it. Therefore there is more mass in the same amount of space.