Vocabulary
What is MATTER?
What is anything that has mass and takes up space.
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.
What is a phase change?
What is a substance that changes a phase of matter (examples: solid --> liquid, liquid --> gas)
The number of atoms before a chemical reaction has occurred _______ the number of atoms after the chemical reaction.
What is equals. (is the same)
What is a molecule?
What are two or more atoms that are bonded together.
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 the two indicators of a chemical change.
What are color change, bubbles, temperature change?
What is a mixture?
What is made when two or more substance are combined, but they are not combined chemically.
Can be easily separated.
Keep their original properties.
True or False.
Elements are Atoms.
What is TRUE?
Elements are atoms.
Molecules are made up atoms (Elements) bonded together.
What is a CHEMICAL CHANGE?
What is a type of change where a new substance is created.
Name an example of a physical change that we did not physically demonstrate in class.
What is for example cutting an apple.
(Other valid examples are permitted.)
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?
What is a solution?
What is a mixture where a substance dissolves or can not be seen in another substance.
Can be separated.
Each molecule can be found on the periodic table with a listed atomic mass.
What is FALSE? ATOMS (Elements) are found on the period table.
What is a PHYSICAL CHANGE?
What is a type of change where the substance stays the same, but size and shape may change.
What are the 3 types of physical changes?
What is Phase Change, Mixtures, and Solutions.
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 is the correct type of physical change for the example below?
Mentos and Diet Coke are put together.
What is a solution.
The Mentos dissolves in the Diet Coke.
What is happening to mass in the Law of Conservation of Mass?
What is the mass of the reactant equals the mass of the products.
CHALLENGE (not a quiz question):
What is a Catalyst?
What is increases the rate of a chemical reaction.
Do know that the arrow represents a chemical reaction has occured
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?
What makes up a solution and identify which is which in the example below.
Sugar + Water = Sugar Water
What is a solute and a solvent.
In the example:
Sugar is the Solute.
Water is the Solvent.
Does this chemical equation represent the Law of Conservation of Mass?
H2O2 --> CO2 + 02
CHALLENGE (not on quiz).
NO. Atoms can not be created or destroyed.
In this chemical equation, hydrogen is missing in the products and carbon appeared.