Download presentation

1
**lecturePLUS Timberlake**

An Introduction to Density by Helen Hanson & John Macaluso lecturePLUS Timberlake

2
**lecturePLUS Timberlake**

Density Density is the ratio of the mass of an object to its volume D = mass = m volume V Units are g/cm3 Note: 1 mL = 1 cm3 lecturePLUS Timberlake

3
**lecturePLUS Timberlake**

Learning Check 1 Osmium is a very dense metal. What is its density in g/cm3 if g of the metal occupies a volume of 2.22cm3? lecturePLUS Timberlake

4
**lecturePLUS Timberlake**

Solution Placing the mass and volume of the osmium metal into the density setup, we obtain D = mass volume = g 2.22cm3 = g/cm3 = g/cm3 lecturePLUS Timberlake

5
**lecturePLUS Timberlake**

Volume Displacement A solid displaces a matching volume of water when the solid is placed in water. 25 mL 33 mL 25 mL lecturePLUS Timberlake

6
**lecturePLUS Timberlake**

Learning Check 2 What is the density (g/cm3) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? 1) 0.2 g/ cm3 2) 6 g/m3 3) g/cm3 33 mL 25 mL lecturePLUS Timberlake

7
**lecturePLUS Timberlake**

Solution 2) 6 g/cm3 Volume (mL) of water displaced = mL mL = mL Volume of metal (cm3) = 8 mL x 1 cm3 = cm3 1 mL Density of metal = mass = 48 g = 6 g/cm3 volume cm3 lecturePLUS Timberlake

8
**Methods for Finding Volume**

The density can also be found by calculating the volume of an object and measuring its mass. height V=(length)(width)(height) width length lecturePLUS Timberlake

9
**lecturePLUS Timberlake**

Density of a Cylinder What is the density of a cylinder with a mass of 250.0g, a radius of 2.0 cm, and a height of 10.0 cm? r h lecturePLUS Timberlake

10
**lecturePLUS Timberlake**

Density of a Cylinder Vcylinder = лr2h = л x 5 x 5 x 10 (cm)(cm)(cm) = 250л cm3 r = radius h = height D = 250/(250л) g/cm3 D = m/V D =1/л g/cm3 m = g D = g/cm3 r h lecturePLUS Timberlake

11
**lecturePLUS Timberlake**

Why Do Things Float? Things (whether solid, liquid or gas) with LESS density will float in a liquid with GREATER density. For example, this is why a stone (with HIGH density) will sink in water (LOW density), but a cork (LOW density) will float in water. lecturePLUS Timberlake

12
**lecturePLUS Timberlake**

Learning Check 3 Which diagram represents the liquid layers in the cylinder? (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1) ) ) V W K W V K W K V lecturePLUS Timberlake

13
**lecturePLUS Timberlake**

Solution (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1) V W K lecturePLUS Timberlake

14
**Density as Conversion Factors**

A substance has a density of 3.8 g/mL. Density = g/mL Equality g = 1 mL Conversion factors: 3.8 g and mL 1 mL g lecturePLUS Timberlake

15
**lecturePLUS Timberlake**

Density Connections Mass Volume kg L g mL (cm3) mg lecturePLUS Timberlake

16
**lecturePLUS Timberlake**

Learning Check The density of octane, a component of gasoline, is g/mL. What is the mass, in kg, of 875 mL of octane? 1) kg 2) 614 kg 3) 1.25 kg lecturePLUS Timberlake

17
**lecturePLUS Timberlake**

Solution 1) kg Unit plan: mL g kg Equalities: 1 mL = g and 1 kg = 1000 g Setup: 875 mL x g x kg = kg 1 mL g density metric factor factor lecturePLUS Timberlake

18
**lecturePLUS Timberlake**

Learning Check If blood has a density of 1.05 g/mL, how many liters of blood are donated if 575 g of blood are given? 1) L 2) L 3) L lecturePLUS Timberlake

19
**lecturePLUS Timberlake**

Solution 1) Unit Plan: g mL L 575 g x mL x 1 L = L 1.05 g mL lecturePLUS Timberlake

20
**lecturePLUS Timberlake**

Learning Check A group of students collected 125 empty aluminum cans to take to the recycling center. If each can has a mass of 3g what volume of aluminum can be made if the cans were melted (Hint: d = 2.7 g/mL)? 1) L 2) 207 L 3) L lecturePLUS Timberlake

21
**lecturePLUS Timberlake**

Solution 1) 1.0 L 125 cans x 3g = 375g = mass 1 can So, V = mass = 375g = 139mL = 0.139L density g/mL lecturePLUS Timberlake

22
**lecturePLUS Timberlake**

Learning Check You have 3 metal samples. Which one will displace the greatest volume of water? 25 g Al 2.70 g/mL 45 g of gold 19.3 g/mL 75 g of Lead 11.3 g/mL lecturePLUS Timberlake

23
**lecturePLUS Timberlake**

Solution 1) 25 g Al x mL = 9.2 mL g 25 g Al 2.70 g/mL lecturePLUS Timberlake

Similar presentations

OK

Density Section 2.1 Measurement of how packed or crowed object is Ratio of mass to volume.

Density Section 2.1 Measurement of how packed or crowed object is Ratio of mass to volume.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on coalition government canada Ppt on management by objectives approach Ppt on nitrogen cycle and nitrogen fixation process Ppt on power sharing in india downloads Post ppt online Ppt on op amp 741 Ppt on power sharing in india download film Ppt on area of parallelogram with vertices Field emission display ppt online Ppt on pin diode radiation