chemistry week 29
DESCRIPTION
Chemistry Week 29. Please get out your notebooks!. April 1, 2013. AGENDA: 1 – Bell Ringer & Agenda 2 – CN: Energy in Chemical Reactions 3 – Work Time: Exothermic & Endothermic Reactions 4 – Summary (Critical Thinking Problem). Today’s Goal: - PowerPoint PPT PresentationTRANSCRIPT
Chemistry Week
29
Please get out your notebooks!
April 1, 2013AGENDA:1 – Bell Ringer &
Agenda2 – CN: Energy in
Chemical Reactions3 – Work Time:
Exothermic & Endothermic Reactions
4 – Summary (Critical Thinking Problem)
Today’s Goal:Students will be able to
define energy and heat and contrast exothermic and endothermic reactions.
Homework1. Exothermic &
Endothermic Reactions – due tomorrow
2. Binder Check – by tomorrow!! After that…it will only be worth 60% credit.
Monday, April 1st Objective: Students will be able to define energy
and heat and contrast exothermic and endothermic reactions.
Bell Ringer:If you are participating in a high
energy activity, describe what happens to your body during the activity.
30 seconds Remaining…
Monday, April 1st Objective: Students will be able to define energy
and heat and contrast exothermic and endothermic reactions.
Bell Ringer:If you are participating in a high
energy activity, describe what happens to your body during the activity.
April 1, 2013AGENDA:1 – Bell Ringer &
Agenda2 – CN: Energy in
Chemical Reactions3 – Work Time:
Exothermic & Endothermic Reactions
4 – Summary (Critical Thinking Problem)
Today’s Goal:Students will be able to
define energy and heat and contrast exothermic and endothermic reactions.
Homework1. Exothermic &
Endothermic Reactions – due tomorrow
2. Binder Check – by tomorrow!! After that…it will only be worth 60% credit.
Cornell Notes Topic: Energy in Chemical
Reactions (Exothermic vs. Endothermic)
Date: 4/01/2013 Energy is the ability to do work or
produce heat. Kinetic energy = energy of movement Potential energy = energy of position Chemical energy = energy of chemical
reactions
Describe
energy.
Cornell Notes (continued) Heat (q) = energy that transfers
from one object (or place) to another because of a temperature difference between the objects.Units of heat energy = Joules (J) or kilojoules (kJ = 1000J)
Heat always moves from objects/places with higher heat to objects/places with lower heat.
What is heat?
Cornell Notes (continued) Chemical potential energy is the
energy stored in the reactants of a chemical reaction.
Measuring energy:Universe = Surroundings +
System
SurroundingsSurroundings
SystemHeat Heat
Endothermic Exothermic
Explain chemica
l potentia
l energy.
q =(+)
q =(-)
Cornell Notes (continued)Compare
and contrast
exothermic and
endothermic
reactions.
Exothermic Endothermic• A chemical reaction where energy is released (exo = exit)• Reactants Products + HEAT• Examples:• burning• exploding• freezing (liqsol)• condensing (gasliq)• sound• temperature of
surroundings increases
• A chemical reaction where energy is absorbed (endo= indoor)• Reactants + HEAT Products• Examples:• growing• melting (solliq)• boiling (liqgas)• cooking• temperature of
surroundings decreases