Chemistry Week 29

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