Limited time offer 20% OFF StudySoup Subscription details

JMU - ISCI 101 - Class Notes - Week 9

Created by: Sydney Davis Elite Notetaker

> > > > JMU - ISCI 101 - Class Notes - Week 9

JMU - ISCI 101 - Class Notes - Week 9

School: James Madison University
Department: OTHER
Course: Physics, Chemistry and the Human Experience
Professor: Lynn Lucatorto
Term: Spring 2017
Tags: isci101, ISCI, Physics, Chemistry, and HumanExperience
Name: ISCI 101 week 9 notes
Description: material on third exam
Uploaded: 03/16/2018
This preview shows pages 1 - 3 of a 10 page document. to view the rest of the content
background image ISCI 101 week 9 Internal Energy - The total energy inside a substance o Thermal energy (relevant to temperature) Molecules vibrate unless temperature is at 0K o Molecular potential energy (relevant to volume) Directly related to distance - Factors that affect internal energy: o Temperature
o Distance between molecules (volume)
o Amount of substance
- Which has a higher internal energy? 100 degrees Celsius water or 80  degrees Celsius water? o 100 degrees Celius water - Which has a higher internal energy? 100 degrees Celsius water or 100  degrees Celsius vapor? o 100 degrees Celsius vapor (molecules are farther away from  each other) Heat - The internal energy can transfer from one substance to another o From HOT to COLD Not from higher to lower internal energy Can heat be transferred from 0 degrees Celsius ice to 0  degrees Celsius water? No, as long as there’s no heat transfer from  surrounding air, because they are the same  temperature - Heat – the energy exchanged or transferred o Unit: Joules (J)
o calorie (cal): 1 cal = 4.2 J
o Calorie (Cal):
Historical carryovers, especially used in energy rating of  foods and fuels
background image Heat Capacity - The capacity to hold/store heat o (in general), after absorbing heat, the temperature of a  substance will increase, and vice versa - When the equal amount of energy is released or absorbed: o The change in temperature will be smaller for the material with  greater heat capacity o The change in temperature will be greater for the material with  smaller heat capacity Specific Heat Capacity - The heat capacity per unit mass of a substance
- Unit: J¼
°C-1g-1  or JK -1g-1 - Equation: Cg = q/m(T f -T i ) Water and its Cg - Cg = 4.18
- Very potent
- High heat capacity
- Human body is 72% water so it can hold a lot of heat
- Car radiator
o Protects car engine from excess heat Water and Climate - Along coastal areas the change in temperature is relatively smaller
- >70% of the Earth’s surface is covered by water
- What would happen if all the water on the Earth was replaced by sand?
o Temperature would increase Thermal Expansion - Expansion – change in volume
- All forms of matter will expand when heated and contract when cooled,
with few exceptions o In general, solids expand a little, liquids expand more, and gases  expand the most - Why can change in temperature change volume?
background image o All matter is made up of atoms  when atoms vibrate slowly, it  occupies a small space and when atoms vibrate fast, it occupies  a large space - Examples: o Railroad tracks expansion joints
o Thermometer
Liquid expands in higher temperature Mercury is very accurate o Hot air balloon Hot air is less dense than the cold air around it, so it rises Hot = overall mass will be smaller, therefore weight will be  smaller - A substance becomes less dense as its temperature increases o Density = mass/volume Water and Thermal Expansion - Ice floating on the surface
- A lake freezes from the surface downward
- Cold water (higher temperature) is more dense than ice (lower 
temperature) Water and Ice - At 4 degrees Celsius, water is the heaviest o Density = 1g/mL - After 4 degrees Celsius, when temperature increases, density (volume)  decreases Lake in Seasons - Summer o Surface of water is warmer than bottom of the lake because of  thermal energy - Winter o Bottom of lake is warmer than the surface of the water
o If the top is frozen over, the ice prevent heat transfer
Heat Transfer

This is the end of the preview. Please to view the rest of the content
Join more than 18,000+ college students at James Madison University who use StudySoup to get ahead
10 Pages 41 Views 32 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
Join more than 18,000+ college students at James Madison University who use StudySoup to get ahead
School: James Madison University
Department: OTHER
Course: Physics, Chemistry and the Human Experience
Professor: Lynn Lucatorto
Term: Spring 2017
Tags: isci101, ISCI, Physics, Chemistry, and HumanExperience
Name: ISCI 101 week 9 notes
Description: material on third exam
Uploaded: 03/16/2018
10 Pages 41 Views 32 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
Join StudySoup for FREE
Get Full Access to JMU - ISCI 101 - Class Notes - Week 9
Join with Email
Already have an account? Login here
×
Log in to StudySoup
Get Full Access to JMU - ISCI 101 - Class Notes - Week 9

Forgot password? Reset password here

Reset your password

I don't want to reset my password

Need help? Contact support

Need an Account? Is not associated with an account
Sign up
We're here to help

Having trouble accessing your account? Let us help you, contact support at +1(510) 944-1054 or support@studysoup.com

Got it, thanks!
Password Reset Request Sent An email has been sent to the email address associated to your account. Follow the link in the email to reset your password. If you're having trouble finding our email please check your spam folder
Got it, thanks!
Already have an Account? Is already in use
Log in
Incorrect Password The password used to log in with this account is incorrect
Try Again

Forgot password? Reset it here