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The process by which one or more substances change to produce one or more different substances.
Chemical Reaction
Endothermic
Name one type of EXOTHERMIC reaction.
Burning a fire, using a stove.
Why is thermal energy an average?
Some particles have more kinetic energy in the substance.
How does energy transform during a chemical reaction?
It never disappearers, but depending on the chemical reaction, the energy is transferred or absorbed.
The total kinetic energy of the tiny particles that make up matter. The faster the particles move, the warmer the matter becomes.
Thermal Energy
The process where plants take solar energy and transform it to thrive.
Photosynthesis
In the process of making a loaf of bread, which of the substances the PRODUCT?
The loaf of bread!
If two or more different reactants make a new product.
What type of chemical reaction is photosynthesis?
Endothermic. The plants absorb the energy from the sun and uses it as fuel.
A substance that takes part in and undergoes a change during a reaction.
Reactant
Energy transferred through electromagnetic waves.
Radiant Energy
In the process of making a loaf of bread, which of the substances are the REACTANTS?
The ingredients it takes to make the bread; flour, egg, yeast, etc.
What are the signs of a chemical reaction?
A new smell, production of light, color change, gas formation, precipitation, or temperature change.
Your friend says frying an egg on a stove is considered an exothermic reaction. Why or why not is she wrong?
She's wrong because the egg absorbs the stove's energy to cook.
A substance produced during a chemical reaction.
Products.
A branch of chemistry that focuses on chemical reactions.
Thermochemistry
What classifies the cooking of the bread as an ENDOTHERMIC reaction?
The product is higher in temperature than the reactants.
List the following substance from greatest thermal energy to least:
a. A canyon
b. A stone
c. A slab of rock
A, C, B
Your friend says eating a burger is considered an endothermic reaction. Why or why not is he wrong?
He is correct because eating the burger absorbs the nutrients in the burger to fuel the body.
Exothermic
Name at least TWO different types of ENDOTHERMIC reactions.
Baking a birthday cake, using an ice pack, melting ice, etc. (These are examples).
Which has more thermal energy: a pool, or a glass of water? And why?
The pool because it has a higher average of both potential and kinetic energy.
When you put water in a freezer to make ice, what makes it an ENDOTHERMIC reaction?
The water absorbs the energy from the freezer and stores it in itself to make ice.
The thermal energy in a substance increases once baking soda reacts to it, even if it doesn't feel warmer. Why is this?
Thermal energy is the average of potential in the object. The two reactants could react, and increase in thermal energy without feeling warmer.