Vocabulary
Material that DOES NOT allow heat to pass through
What is an insulator?
Is a melted popsicle an example of a physical change?
What is YES? You can melt and refreeze a popsicle and it will still be a popsicle.
Is rust an example of a chemical change?
What is YES? You cannot change rust back into the metal is was before; therefore, it is a chemical change.
Matter cannot be created or destroyed
Law of Conservation of Mass
Energy is transferred by direct contact. The objects are touching.
What is conduction?
Material that allow heat to pass through
What is a conductor?
Is Alka-Seltzer and water an example of a physical change?
What is NO? When you mix Alka-Seltzer and water, bubbles form, which indicates a chemical change as taken place.
Name two indicators of a chemical change.
What are color change, bubbles, temperature change?
What is a chemical equation that has the same number of atoms in the products and reactants
What is Balanced
Macaroni rising and falling in a pot of boiling water
What is convection?
What can you say about this endothermic reaction?
6NH3 + 6H2O ---> 6N6H12O6 + 6NH3
A large molecule was formed.
Name a food that is an example of a physical change.
What is a salad or trail mix?
Name a food that is an example of a chemical change and explain why.
What is a cake, because you cannot turn a cake back into the eggs, flour, sugar, etc. that you mixed together?
50 grams of magnesium reacts with oxygen. How many grams of magnesium will be present after the reaction occurs?
What is 50 grams
Heat transferred from all the machines in the computer room
What is radiation?
When heat is released in a chemical reaction, what type of reaction has occurred?
What is an exothermic reaction?
Explain how water could be an example of a physical change.
What is freezing and melting water to and from ice is an example of a physical change?
True or False. Turning peanuts to peanut butter is an chemical change.
What is FALSE? To make peanut butter, you grind up roasted peanuts, so nothing new is being created.
What do the products and reactants of a chemical reaction have in common?
What is they have the same amount of matter.
Obtain an air popcorn popper. Place the popcorn kernels in the popper. Plug in / turn on popper. Hot air will transfer heat to the kernels, making them expand and pop.
What is convection?
A process in which the physical and chemical properties of the original substances change as new substances with different physical and chemical properties are formed
What is a chemical reaction
CHALLENGE (not a quiz question): Explain how the water cycle an example of a physical change.
What is YES, it is a physical change, because water changes from a liquid/solid when it precipitates, to a gas when it evaporates, then forms back into a liquid when it condensates. Then the process repeats again with the same substance, WATER!
CHALLENGE (not a quiz question) Explain how a rocket launch is an example of a chemical change.
What is the fuel combines with another chemcial to produce large volumes of a hot gas that propel the rocket into space?
According to the Law of Conservation of Mass, if 5 atoms of carbon are used as a reactant, how many atoms of carbon must be a part of the product?
What is 5 atoms
Put oil in the bottom of a pan. Cover the bottom of the pan with popcorn kernels. Place the pan on the stove and turn the burner to medium heat. Cover the pan with a lid. Periodically shake the pan so the kernels move around in the oil.
What is conduction?