Which do you think would have the greater mass? Greater volume? Why? Density Notes Which do you think would have the greater mass? Greater volume? Why? 1 kg of feathers 1 kg of rock _______________ _______________

Volume is the amount of ____________ something takes up Volume vs. Mass Mass is the amount of ___________ in an object (how “heavy” something is) Volume is the amount of ____________ something takes up

Finding Mass Place the object on a scale or ____________ Units should be _________(g) or ___________(kg)

Finding Volume of a Regular Shape An object with a “regular” shape is ___________ and __________ Measure ______(L), _____(W) and ______(H) Multiply L x W x H Make sure units make sense (cm3, m3) 4 cm x 6 cm x 5 cm = ________ Conversion Factor: 1 cm3 = _____

Finding Volume of an Irregular Shape An object that can not easily be measured Use ______________ Fill a graduated cylinder or overflow can with water Measure __________water goes ____/spills ____when object is placed in water Remember: 1 cm3 = 1mL

Depends on the units used for mass and volume DENSITY Density is defined as ______per unit ______. It is a measure of how ________ packed and how ___________the molecules are in an object. Density is the amount of matter within a certain volume (how much “stuff” is crammed into something) Density is the amount of matter within a certain volume. Units of Density: ______ or ______ Depends on the units used for mass and volume

Density of Phases of Matter Which phase of matter is the densest? Which phase of matter is the least dense? *Usually the solid phase of a substance will ________in it’s liquid phase because it is more _________ _______ _______ Water is an exception! Because water ________ when it __________, solid water (ice) is actually _________dense than liquid water

Densities of Common Substances (g/mL) Solids Bone 2 Brick 1.8 Cork 0.2 Ice 0.92 Marble 2.7 Paraffin 0.9 Rubber 1.2 Bamboo 0.3 Oak Wood 0.7 Pine Wood 0.6 Metals Aluminum 2.7 Copper 8.9 Gold 19.3 Iron 7.8 Lead 11.3 Silver 10.5 Liquids Pure Water 1.0 Sea Water 1.03 Alcohol 0.8 Gylcerine 1.3 Milk 1.03 Turpentine 0.9 Mercury 13.6 Gasoline 0.7 Note: The __________of a substance will always be the __________, regardless of it’s shape or size i.e. the density of pure water is always 1 g/mL

Density (D) is mass (m) per unit volume (v) Finding Density Density (D) is mass (m) per unit volume (v) per = ___________by D = m/v (m ÷ v) Formula: D = M / V M =______ V = ______ M = ______ V= _________ D = _________ Divided by Multiplied by

Practice Problem #1 If the mass of an object is 35 grams and it takes up 7 cm3 of space, calculate the density. Given: Mass = Volume = Density = Formula: ______________ Solution:

Practice Problem #2 & 3 2. A rectangular block of copper metal has a mass of 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper? 3. Find the mass of 250.0 mL of benzene. The density of benzene is 0.8765 g/mL.

Practice Problem #4 What volume of silver metal will has a mass of exactly 2500.0 g. The density of silver is 10.5 g/cm3.