Transcript Chemical Energy

Bellringer
Do not write the question….
Identify the following as conduction,
convection, or radiation.
1.
2.
3.
4.
5.
6.
Getting your hands warm by a campfire
Touching a hot pan from the oven
The sun warms the sand on a beach
Boiling water to make macaroni
Holding a cup of hot coffee in your hand
Heating air inside of a hot air balloon
Review
__________ is the ability to cause
change.
– A. Work
– B. Energy
– C. Power
– D. Velocity
Review
__________ is the energy stored in an
object due to its position.
– A. light energy
– B. kinetic energy
– C. potential energy
– D. thermal energy
Review
__________ is a form of energy an
object has if it is moving.
– A. Potential Energy
– B. Kinetic Energy
– C. Chemical Energy
– D. Thermal Energy
Review
If the particles in an object begin to
move more quickly, their average kinetic
energy __________ and the object's
temperature __________ .
– A. Increases; rises
– B. Increases; drops
– C. Decreases; rises
– D. Decreases; drops
Review
The transfer of energy that occurs when
you touch a hot object and you are
burned is called:
– A. radiation
– B. conduction
– C. convection
– D. thermal
Review
The transfer of energy that allows you to
get warm while sitting next to a fire is
called:
– A. radiation
– B. conduction
– C. convection
– D. thermal
Review
When energy changes from one form to
another, the total amount of energy:
– A. increases
– B. decreases
– C. stays the same
– D. depends on the type of energy
Review
Which of the following is NOT a form of
energy?
– A. Chemical
– B. Thermal
– C. Kinetic
– D. Friction
Review
__________ is a measure of the
average kinetic energy of all the
particles in an object.
– A. thermal
– B. temperature
– C. density
– D. conduction
Review
Heat is the thermal energy that flows
from a material with a _____
temperature to one with a _____
temperature.
– A. high; low
– B. low; high
– C. low; low
– D. high; high
Review
These currents help your soup to warm
evenly over a burner:
– A. chemical
– B. conduction
– C. thermal
– D. convection
Study Pack #7
Today’s Goals…
I can explain how energy is involved in
chemical reactions.
Page 178
Chemical Reactions
A change in matter that forms a new
substance is called a chemical change
– The new substance is made of the same
elements as the original substance but in
different combinations
Chemical Reactions
A chemical change is a chemical
reaction
What are some of the chemical
reactions going on around you?
Energy in Chemical Reactions
Every chemical reaction involves a
change of energy
– Release energy or absorb energy
– Recall the signs of a chemical change
Energy in Chemical Reactions
If it releases energy it is called an
exothermic reaction
– A car engine
– Burning oil, coal, gas in your home for heat
Energy in Chemical Reactions
If it absorbs energy it is called an
endothermic reaction
– Baking cookies
What did you learn?
True or False
– A chemical reaction is a chemical change.
– New substances can be produced in
chemical reactions.
– A chemical reaction that absorbs energy is
called an exothermic reaction.
– Baking cookies is an example of an
endothermic reaction.