Chemical Changes 1
What is a chemical change?
Matter transforms into one or more new substances with different chemical properties and compositions.
If I mix Universal Indicator and Vinegar together, what is the chemical change that takes place?
When we mixed the washing soda solution and the Epson Salt solution, what is the evidence a chemical change happened?
A precipitate formed.
When we roasted a marshmallow, what was an evidence of a chemical change?
Odor, color change, etc.
Name two teachers that were here last year but are not this year.
Mr. Foster, Mrs. Shannon, Ms. O, Coach Nash, Coach Childers, etc.
What is an evidence of a chemical change when we cracked the glow stick?
Light produced
What is the evidence a chemical change took place when the hand warmer mixed with the air.
Change in Thermal Energy
If I mix two liquids and bubbles form what is the evidence of chemical change?
A production of gas.
Name at least two examples of an evidence a chemical change has taken place while baking a cake.
Who is the best football team?
Detroit Lions
Name the seven evidences a chemical change has happened.
Unexpected Color Change, Odor, Gas, Precipitate, Unexpected Change of Thermal Energy, Sound, and Light Produced
What is an example of a physical change?
Answers vary
Melting, tearing, ripping, etc.
What is the evidence of a chemical change on rusting or tarnishing?
Color Change
Name 3 evidences of a chemical change in the elephant toothpaste.
Odor, Production of gas, Change in Thermal Energy
What college did Mr. Capps graduate from?
Sam Houston State University and Lamar University
Why is burning a piece of wood in a campfire an example of a chemical change?
Why is evaporation not a chemical change?
Liquid is converting to gas through vaporization, but it is still water so it is not a chemical change.
What was the evidence of a chemical change when we burned the paper airplane?
Unexpected color change and production of gas.
What is the definition of a substance?
Matter with distinct characteristics.
Why can you not hear sound in space?
Sound waves require a medium to travel through (air, water, or solid ground), and space is a vacuum so there is no way for it to travel.
B or F
When a chemical change occurs, what happens to the total mass of the substances involved?
It stays the same because of the Law of Conservation of Mass.
What does endothermic mean?
A chemical or physical change that absorbs thermal energy (heat) from its surroundings, causing the surrounding temperature to drop.
What does exothermic mean?
A chemical reaction that releases energy (heat, light, sound, or electricity) into it's surroundings.
What is the only rock that can float on water?
Pumice. It is a volcanic rock that is violently ejected from a volcano. Rapid cooling traps gas bubbles inside making it less dense than water.