Presentation on theme: "Chapter 1: Introduction to Matter"— Presentation transcript:
1 Chapter 1: Introduction to Matter Section 2: Measuring Matter
2 Weight Measure of the force of gravity on you. Changes depending on location.e.g. An object weighs less on the moon than it does on Earth because the force of gravity is weaker on the moon than it is on Earth.Physical property
3 Mass Measurement of the amount of matter in the object. Does not change with location or the force of gravity.Preferred measure of matter over weight.Physical propertyTool: triple beam balanceUnitsInternational System of Units (SI) unit of mass is the kilogram (kg).Also commonly measured in grams (g)1 kg = 1,000 g1 g = kg
6 Checkpoint 1What is the difference between mass and weight?
7 Checkpoint 1 What is the difference between mass and weight? Weight changes based on the force of gravity; mass is constant.
8 Volume Amount of space that matter occupies. Units: liter (L), milliliter (mL), and cubic centimeter (cm3)1 L = 1,000 mL1 mL = L1 mL = 1 cm3Finding the volume of liquids: use a graduated cylinderCalculating the volume of regular solids: use a ruler to measure the length, width and heightVolume = L x W x HUnits = cm x cm x cm = cm3Calculating the volume of irregular solids: submerge the object in water in a graduated cylinder; the water level will rise by an amount equal to the volume of the object in mL (displacement method)Physical property
9 Using a Graduated Cylinder Meniscus: concave surface of a liquid resulting from surface tension.Should always measure a liquid in a graduated cylinder from the bottom of the meniscus.Graduated cylinders with smaller gradations are more accurate.In order to report the correct number of significant digits, you should estimate one additional digit beyond the gradation increment.
11 Volume of water = 4.80 mL Volume of dinosaur = 0.80 mL Volume of water + dinosaur = 5.60 mL
12 Checkpoint 2What is the volume of the liquid shown below?
13 Checkpoint 2What is the volume of the liquid shown below?73.0 mL
14 DensityMeasurement of how much mass of a substance is contained in a given volume.D = m/vUnits: g/mL or g/cm3Objects with a greater density will sink; objects with a lesser density will rise.Physical propertyIntrinsic/Intensive property (the same for a given substance regardless of size, shape, or amount; e.g., water always has a density of 1 g/ml)Can be used to identify and classify matter.
15 Checkpoint 3The mass of an object is 10 grams and its volume is 5 cm3. What is the object’s density?
16 Checkpoint 3The mass of an object is 10 grams and its volume is 5 cm3. What is the object’s density?D = m/v = 10 g/5 cm3 = 2 g/cm3
17 Post-lesson Quiz1. Which of the following tools are used to measure mass?a. graduated cylinderb. rulerc. triple beam balanced. thermometer
18 Post-lesson Quiz2. Which of the following tools are used to measure the volume of liquids?a. graduated cylinderb. rulerc. triple beam balanced. thermometer
19 Post-lesson Quiz3. An object floats in water. How does the object compare to the water? a. it is heavier b. it is lighter c. it is denser d. it is less dense
20 Post-lesson Quiz4. Which of the following is a measure of the amount of space that matter occupies? a. mass b. density c. volume d. weight
21 Post-lesson Quiz5. What is the volume of the liquid below? a mL b. 35 mL c mL d. 36 mL