Measuring Energy Changes What a great way to spend block day!

Slides:



Advertisements
Similar presentations
How many Joules of energy are required to raise the temperature of 75 g of water from 20.0 o C to 70.0 o C? Heat =75 g x 50.0 o C x 4.18 J/g o C Heat=
Advertisements

Aim: What is thermochemistry?. Law of Conservation of Energy In any chemical or physical process, energy is neither created nor destroyed. There are different.
Thermochemistry -- The Flow of Energy: Heat -- Thermochemistry: the study of heat changes in chemical reactions Chemical potential energy: energy stored.
Examples: q=mcT.
General, Organic, and Biological ChemistryCopyright © 2010 Pearson Education, Inc.1 Specific Heat.
 Energy (heat) may be expressed in joules or calories.  1 calorie (cal) = joules (J)  How many joules in 60.1 calories?  How many calories.
Energy and Specific Heat Date:. Energy The ability to do work Multiple forms of energy We are going to focus on heat, q.
Thermal energy and Heat. Thermal energy Thermal energy is the total kinetic energy of all particles in a substance Measured in joules (J) This is not.
Specific Heat Review Cp = q/(m)(Δt).
What’s the MATTER: Specific Heat of Matter
Thermochemistry The study of the changes in heat energy that accompany chemical reactions and physical changes.
Heat and TemperatureSection 2 Specific Heat Capacity specific heat capacity (c): The amount of heat required to raise the temp. of one gram of a specific.
Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc. Chapter 2 Matter.
Section 10.2 The Flow of Energy 1.To understand how heat energy flows and how it is measured 2.To understand how substances differ in their capacity to.
Specific Heat mC  T. Specific Heat The amount of heat energy a material requires to raise its temperature is a characteristic that can be used to identify.
Unit 10 Thermochemistry.
Chapter 5 Energy.
Energy A Give and Take The Nature of Energy Energy: the ability to do work or produce heat Potential energy (store energy): energy due to position.
Energy Section 3-3 (somewhat). Energy Physical and chemical changes are always accompanied by energy changes. – Released (Exothermic) – Absorbed (Endothermic)
Thermochemistry: The study of heat changes that occur during chemical reactions and physical changes of state.
Thermochemistry.
Temperature(“Degree of hotness”) - is the distribution of energy through the molecules. - related to the motion (speed) of molecules. Heat ≠ Temperature.
Ch. 15: Energy and Chemical Change
Thermochemistry. Do Now – Check and edit prelabs Objective – Thermochemistry Exothermic, endothermic, calorie, joule, heat capacity, and specific heat.
Energy Unit 1. States of Matter Changing State of Matter.
Quantifying Heat The Math!.
Reaction Energy and Reaction Kinetics Chapter 17 Notes.
Heat and Temperature. The difference Heat – the energy that flows from hot to cold. Measured in Joules (J) or calories (cal). Temperature – measure of.
ENERGY AND CHEMICAL CHANGE Chapter 15. ENERGY ENERGY: -the ability to do work or produce heat. 2 different forms: potential and kinetic -Measured in.
Energy in Food Ever wonder why you don’t have enough energy ? Energy is defined as the ability to do work!
Ch 13: Solids and Liquids Ch 13 begins with notes from Ch 3.6 and 3.7 on Energy, Temperature and Heat. We did not do these sections when in Ch 3 as the.
Specific Heat Capacity. deals with heat changes that occur during chemical reactions deals with heat changes that occur during chemical reactions Heat.
HEAT GOAL: TO UNDERSTAND THE NATURE OF ENERGY, BE ABLE TO QUANTIFY THE TRANSFER OF ENERGY IN A SYSTEM, AND PERFORM CALCULATIONS RELATED TO HEAT.
Specific Heat Capacity. deals with heat changes that occur during chemical reactions deals with heat changes that occur during chemical reactions Heat.
Quantifying Heat The Math!. What is HEAT?  It’s the flow of energy due to a difference in temperature.  From a higher temperature (higher kinetic energy)
What’s the MATTER: Specific Heat of Matter. Matter, Specific Heat of Matter At the conclusion of our time together, you should be able to: 1. Define specific.
Thermochemistry -- The Flow of Energy: Heat --. Water Constants Solid 7.9 Liquid Gas 8.5.
Energy exits in two basic forms, ____________________ and ____________________ energy.
Energy. What is Energy? Energy is the ability to do work or produce heat Energy exists in two basic forms –Potential Energy: energy due to the composition.
Section 10.2 The Flow of Energy 1.To convert between different energy units. 2.To understand the concept of heat capacity. 3.To solve problems using heat.
Specific Heat Capacity Or the amount of energy needed to heat substances up.
Heat energy is measured in units called joules or calories. 1 calorie is the amount of heat energy needed to raise the temperature of 1.0 g (mL) of water.
Specific Heat Quantity of energy needed to increase the temperature of one gram of a substance by one degree Celsius/Kelvin Every substance has its own.
 Different substances require different amounts of heat to change their temperature.  Objects that require more energy have a high heat capacity like.
Measurement of Heat Energy. The amount of heat given off or absorbed in a reaction can be calculated by a) q=mc∆T(Table T) q= heat (in joules or calories)
The Specific Heat of Water. one gram one degree celcius The heat required to raise one gram of water one degree celcius. The specific heat of water is.
Chemistry Notes Energy and Heat Heat Capacity and Specific Heat.
Heat capacity and Calorimetry
(17.1) Energy Transformations
Chapter 17 Thermochemistry.
3.4 Energy Energy makes objects move. makes things stop.
Thermochemistry: The study of heat changes that occur during chemical reactions and physical changes of state.
SPECIFIC HEAT & CALORIMETRY
Unit 5: Thermochemistry
Thermochemistry Study of transfers of energy as heat that accompany chemical rxns and physical changes Part 1.
What is it and how do we measure it?
Energy EQ: What is the relationship between heat energy and temperature?
Quantitative Energy Problems
Heating and Cooling Curves
The Flow of Energy.
Thermochemistry The study of the changes in heat energy that accompany chemical reactions and physical changes.
Chapter 3 Matter and Energy
∆T is positive when T increases, and q is positive
Ch10 Energy & Causes of Change
Thermochemistry: The study of heat changes that occur during chemical reactions and physical changes of state.
Unit 5: Thermochemistry
Energy 16.1.
Thermochemistry The study of the changes in heat energy that accompany chemical reactions and physical changes.
Thermochemistry.
Presentation transcript:

Measuring Energy Changes What a great way to spend block day!

Let’s get some units up in here! calorie: the amount of energy you need to raise the temperature of 1g of water by 1°C. –Different from Calorie (used for food) which is actually a kilocalorie (1000 cal) Joule: 1 cal = J Conversion Factor!!!

Yay Practice! Ex. Express 34.8 cal of energy in Joules. 34.8cal J = 146 J 1 cal You do one! Express 47.3 J in calories.

Check It! 47.3 J 1 cal = 11.3 cal J

Does It Get Harder? Maybe… Specific Heat: the amount of energy needed to raise the temperature of 1g of a substance by 1 °C. –For water, we said this was J/g °C

What If I Need More than 1°C? Ex. Determine the amount of energy in joules required to raise the temperature of 7.4g of water from 29.0°C to 46.0 °C. Use Q= m∙c∙∆T: m=7.4g c water =4.184 J/g °C ∆T= (big-little) = (46.0 °C – 29.0 °C) = 17.0 °C =(7.4g) x (4.184 J/g °C) x (17 °C) = 526J

Yay More Practice Calculate the joules of energy required to heat 454g of water from 5.4 °C to 98.6 °C.

Check It! Q=m∙c∙∆T m = 454g c water = J/g °C ∆T = (98.6 °C – 5.4 °C) = 93.2 °C = (454g) x (4.184 J/g °C) x (93.2 °C) = 1.77x10 5 J or 177,000 J

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.