Review Session 2 PROPERTIES OF MATTER M A SS, VOLUME, DENSITY
Properties of Matter Some are specific to only one substance This is a characteristic property Density, Boiling Point, Melting Point Some can be shared by a lot of substances This is a non-characteristic property Mass, Volume, Temperature, acidity, alkalinity
Concept 1: Mass Def: The amount of matter in an object How much stuff there is in your object! Which box has a greater mass?
Concept 1: Mass Mass is measured in grams! Small masses are measured in milligrams (mg) Medium masses are measured in grams (g) Large masses are measured in kilograms (kg) The instrument to measure mass is the balance!
Concept 1: Mass To measure regular object (not liquids or small particles) 1. Calibrate balance to zero 2. Place object on balance To measure irregular objects (liquids or small particles) 1. Calculate mass of empty container (m i ) 2. Place object inside the container 3. Calculate mass of container + object (m f ) 4. m object = m f - m i
Typical Exam Question on Mass The unit for mass is: a) Litre (L) b) Meter (m) c) Grams per centimeter cubed (g/cm 3 ) d) Grams (g)
Typical Exam Question on Mass To measure the mass of a car, which unit would you use? a) Milligram (mg) b) Gram (g) c) Kilogram (kg) d) Litre (L)
Typical Exam Question on Mass To measure the mass of a stamp, which unit would you use? a) Milligram (mg) b) Gram (g) c) Kilogram (kg) d) Litre (L)
Typical Exam Question on Mass The instrument used to measure the mass of a regularly shaped object is a) A ruler b) A graduated cylinder c) A microscope d) A balance
Concept 2: Volume Def: The amount of space an object takes up How spread out your object is Which box has a greater volume?
Concept 2: Volume Volume is measured in two units! Solids are measured in cm 3 Liquids are measured in ml (millitres-small amounts) or L (litres-large amounts) Two different instruments to measure volume Ruler and mathematical equation Graduated cylinder
Concept 2: Volume Measuring volume of a regular solid Length x width x height 15 cm 10 cm 5 cm
Concept 2: Volume Measuring volume of a liquid Pour liquid into graduated cylinder
Concept 2: Volume Measuring volume of a irregular solid: Water displacement Step 1 Pour a certain amount of water in the cylinder (enough to completely cover it) V i Step 2 Place object inside cylinder V f Step 3 V object =V f - V i
Typical Exam Question on Volume Ms Di Lallo wants to measure the volume of a rock. What method would she use? a) L x W x H b) Water displacement c) D=m/V d) None of the above
Typical Exam Question on Volume The unit for volume is: a) Litre (L) b) Meter (m) c) Grams per centimeter cubed (g/cm 3 ) d) Grams (g)
Typical Exam Question on Volume Ms Di Lallo had a graduated cylinder filled with 25 ml of water. She placed a rock in it. The water rose to 28 ml. What is the volume of the rock? a) 53 ml b) 28 ml c) 13 ml d) 3 ml
Concept 3: Density A characteristic property Means that only one substance has any specific density Density is the mass per unit volume It is measured by the following equation D= m/v Unit: g/ml (liquids) or g/cm 3 (solids)
Concept 3: Density To calculate density Step 1: Measure the mass use a balance Directly or indirectly (put in container; only for liquids/small particles) Step 2: Measure the volume Regular shaped object LxWxH Irregular shaped object water displacement Liquid graduated cylinder Step 3: divide mass by volume
Typical Exam Question on Volume Ms Di Lallo has been asked by Ms Sue to find the density of a rock. She found out the mass of her rock was 57 g and through displacement, the volume of the rock was 23 ml. What is the density of the rock? a) 80 g/ml b) 34 g/ml c) 0.41 g/ml d) 2.48 g/ml
Typical Exam Question on Volume Ms Di Lallo is not sure if the ring she got was made of gold (19.3g/mL), silver (10.5g/mL), or aluminum (2.7g/mL). The mass of her ring has a mass of 13.5g and a volume of 5 ml. What is the ring made of? a) Gold b) Silver c) Aluminum d) None of the above