Introduction

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Mr. Quinn & Ms. Tom March 4, 2014 Aim: How does the temperature of water change as energy is transferred? Do Now: What are the units for heat? What are the units for mass? What are the units for temperature? What is the specific heat of water?

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Mr. Quinn & Ms. Tom March 4, 2014 Aim: How does the temperature of water change as energy is transferred? Do Now:. Introduction. This is the equation to use for all heating and cooling liquid water problems: Q = mC ( t f -t i ) - PowerPoint PPT Presentation

Transcript of Introduction

Page 1: Introduction

Mr. Quinn & Ms. Tom March 4, 2014

Aim: How does the temperature of water change as energy is transferred?

Do Now:

What are the units for heat?

What are the units for mass?

What are the units for temperature?

What is the specific heat of water?

Page 2: Introduction

Introduction

This is the equation to use for all heating and cooling liquid water problems:

• Q = mC(tf-ti)

• We need to be able to get any variable by itself:Mass tf ti

Page 3: Introduction

Let’s Try It Out!

What is the amount of heat energy released when 20.0 grams of water is cooled from 20.0°C to 10.0°C?

Q = mC(tf-ti)

Q =m =C =tf =ti =

Hints:What are you looking for?Where do you find “C?”The temperature you start from is ti

The temperature you go to is tf

Page 4: Introduction

Let’s Try It Out!

The temperature of a sample of water changes from 5°C to 25°C when the sample absorbs 836 joules of heat. What is the mass of the sample?

Q = mC(tf-ti)

Q =m =C =tf =ti =

Hints:What are you looking for?Where do you find “C?”The temperature you start from is ti

The temperature you go to is tf

Page 5: Introduction

Let’s Try It Out!

An 8.0-gram sample of H2O (ℓ) at 9.0°C absorbs 200 joules of heat. What is the final temperature of the H2O (ℓ) sample?

Q = mC(tf-ti)

Q =m =C =tf =ti =

Hints:What are you looking for?Where do you find “C?”The temperature you start from is ti

The temperature you go to is tf

Page 6: Introduction

Your Turn!

Page 7: Introduction

Let’s Try It Out!

A 20.0-gram sample of H2O (ℓ) at 8.0°C absorbs 413 joules of heat. What is the final temperature of the H2O (ℓ) sample?

Q = mC(tf-ti)

Q =m =C =tf =ti =

Hints:What are you looking for?Where do you find “C?”The temperature you start from is ti

The temperature you go to is tf

Page 8: Introduction

Let’s Try It Out!

The temperature of a sample of water changes from 20°C to 40°C when the sample absorbs 836 joules of heat. What is the mass of the sample?

Q = mC(tf-ti)

Q =m =C =tf =ti =

Page 9: Introduction

Let’s Try It Out!

What is the amount of heat energy released when 100.0 grams of water is cooled from 30.0°C to 10.0°C?

Q =m =C =tf =ti =


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