Chapter 2: Measurement and Problem Solving

Slides:

Advertisements

Similar presentations

Advertisements

The amount of matter (mass) in a given space (volume)

Which has more mass? A) 1 kilogram of feathers B) 1 kilogram of bricks

Density Chapter 1 Matter, Measurements, & Calculations Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings.

Density Why Do Some Things Float While Others Sink?

Density. What is It? Derived unit which shows the mass per unit of volume More dense materials are “heavier” than less dense materials Density compares.

1 1.8 Density Chapter 1Measurements Copyright © 2009 by Pearson Education, Inc.

A Look at Density and How to Calculate It

Characteristic Physical Properties

DENSITY How dense is dense?. What’s the matter? Matter exists in 3 main forms: solid liquid and gas. Density is the concentration of matter (atoms) in.

Density All substances have different densities, therefore, you can identify a substance if you know its density The formula to calculate something’s density.

Density Type of Units, Formula, Solving Density Problems.

Density Density describes how heavy an object is compared to its size.

1 2.8 Density Chapter 2Measurements Copyright © 2008 by Pearson Ed ucation, Inc. Publishing as Benjamin Cummings.

Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc. Chapter 1 Chemistry.

Learning Goals  Explain the meaning of mass and describe the units for measuring mass.  Distinguish between mass and weight.  Define volume and explain.

“The Density Equation” Mass (g) Volume (mL or cm 3 ) Density (g/mL or g/cm 3 )

Temperature. 2 Temperature Scales Fahrenheit scale, °F used in the U.S. Celsius scale, °C used in all other countries Kelvin scale, K absolute scale no.

Density The mass per unit of volume of a substance.

Section 10.1 Learning Goals

SCIENCE SKILLS. 2.2 Density  Density describes how much mass is in a given volume of a material.

Properties of Matter Mass Volume Density.

2.2 Density Density describes how much mass is in a given volume of a material.

WU 9/7 1.How many sig. figs are in these measurements? a) g b L c mg d e s 2.Perform the following calculations:

End Show Slide 1 of 25 Density 3.4. End Show © Copyright Pearson Prentice Hall Slide 2 of 25 Density If you think that these lily pads float because they.

Matter Chapter Twelve: The Physical Properties of Matter 12.1 Density 12.2 Buoyancy 12.3 Properties of Materials.

Introduction to Matter Lecture: Calculating Density.

Density is defined as mass per unit volume. It is a measure of how tightly packed and how heavy the molecules are in an object. Density is the amount of.

Mass, Volume and Density

Density. What is Density? Density is a characteristic physical property of matter -Each substance has its own density and many substances can be identified.

General, Organic, and Biological Chemistry Fourth Edition Karen Timberlake 1.10 Density Chapter 1 Chemistry and Measurements © 2013 Pearson Education,

Density DEF: amount of mass in a certain volume. Density is a physical property. Solids have the highest density. Gases have the lowest density. The density.

each substance has its own density and can be identified by it

Density Section 2.3. High population density (large population per square mile) Low population density (small population per square mile)

Density How close together the molecules of an object are. How Dense the molecules are. “Dense forest” = thick, hard to see through.

What is the formula? How can density be used to identify materials?

UNIT THREE: Matter, Energy, and Earth  Chapter 8 Matter and Temperature  Chapter 9 Heat  Chapter 10 Properties of Matter  Chapter 11 Earth’s Atmosphere.

Density. Which weighs more? Which one of these weighs more??? A kg of bricks or a kg of feathers? Both of the objects are 1 kg… so they both weight the.

DENSITY Q) Which weighs more:- A kilogram of feathers or a kilogram of iron?

DENSITY. Factors affecting density Temperature- as temperature increases density decreases. Pressure- as pressure increases density increases. Size –

2.7 Density Learning Goal Calculate the density of a substance; use the density to calculate the mass or volume of a substance. Objects that sink in water.

DENSITY Density is defined as mass per unit volume. It is a measure of how tightly packed and how heavy the molecules are in an object. Density is the.

Density What is density?

Density- notes page 21 Essential Question: How do we explain density?

Activity #21 DENSITY.

Chapter 1 Measurements 1.8 Density.

Chapter 2 Measurements 2.8 Density

Density Think back to our definition of matter (anything that has mass and takes up space). What is another word for how much space something takes up?

These two objects are the same volume, so why is one heavier?

And Calculating with Significant Digits

WARM UP (for NOTES) 1. Which is more dense, water or wood?

Density Which is heavier- One pound of lead or one pound feathers?

Chapter 1 Measurements 1.7 Density

Density Think back to our definition of matter (anything that has mass and takes up space). What is another word for how much space something takes up?

Determining if an object will float or sink

What is Density? The ratio between the mass of an object and the volume of the same object In other words, it tells you how much matter an object has within.

Chapter 1 Measurements 1.7 Density

Section 10.1 Learning Goals

Characteristic physical properties

Determining Density Chapter 2 Section 2 pp

MEASURING MATTER.

NOTES—WHAT IS DENSITY? Density is the amount of mass per unit of volume; it describes how much matter is packed into a space. Density is determined by.

Chapter 10 Density.

What weighs more a ton of bricks or a ton of feathers?

A closer look at the physical property of Density

Presentation transcript:

Chapter 2: Measurement and Problem Solving Section 5: Density

Learning Objectives Calculate the density of a substance. Use density as a conversion factor.

Density The density of a substance is the ratio of its mass to its volume.

Density Measuring mass: use a balance Measuring volume: Formula (l x w x h) (πr2h) Water displacement (Vf-Vi)

Density Units of density: Solid substance = g/cm3 Liquid substance = g/mL

Example A sample of liquid has a volume of 22.5 mL and a mass of 27.2 g.

Density D = m/V m = V =

Example For a liquid substance with a density of 1.32 g/cm3, what volume should be measured to deliver a mass of 68.4 g?

Example A steel cylinder has a volume of 246 cm3 and a density of 7.93 g/cm3. What is its mass in kilograms?

Density Density is an intensive property It does not change, no matter the size of a sample 1 kg of gold has the same density as 1 g, or 1 lb, or 1000 kg, etc.

Density Every substance has a unique density you can identify an unknown substance by calculating its density and comparing it to known values

Temperature and Density Density changes with temperature For most substances, an increase in temperature results in a decrease in density

Temperature and Density As temperature increases, molecules move further apart. This increases the volume of the substance while the mass remains the same – thereby decreasing the density. So solids are more dense than liquids, which are more dense than gases

Density of Water The density of liquid water is 1.00 g/mL Anything more dense than water will sink Anything less dense than water will float

Density of Water Water is one of a unique group of substances that is actually less dense as a solid than a liquid Ice floats in water!

Practice A jeweler offers to sell a ring to a woman and tells her that it is made of platinum. Noting that the ring feels a little light, the woman decides to perform a test to determine the ring’s density. She places the ring on a balance and finds that it has a mass of 5.84 g. She also finds that the ring displaces 0.556 cm3 of water. Is the ring made of platinum? The density of platinum is 21.4 g/cm3.

Practice Mass = 5.84 g Volume = 0.556 cm3

Practice The woman takes the ring back to the jewelry shop, where she is met with endless apologies. The jeweler had accidentally made the ring out of silver rather than platinum. The jeweler gives her a new ring that she promises is platinum. This time when the customer checks the density, she finds the mass of the ring to be 9.67 g and its volume to be 0.452 cm3. Is this ring genuine?

Practice Mass = 9.67 g Volume = 0.452 cm3