Vocabulary
Anything that has mass (weight) and takes up space.
MATTER
Is a melted popsicle an example of a physical change?
YES. You can melt and refreeze a popsicle and it will still be a popsicle.
Is rust an example of a chemical change?
YES. You cannot change rust back into the metal is was before; therefore, it is a chemical change.
True or False. If you know the weight of a portion of an object than you CANNOT determine the weight of the whole object?
FALSE
You use these to help you identify the physical properties.
YOUR SENSES
These are the characterstics of an object and you use your senses to identify them.
PHYSICAL PROPERTIES
Is Alka-Seltzer and water an example of a physical change?
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.
colour change, bubbles, temperature change.
Name the 3 types of matter.
SOLID, LIQUID, GAS
Name 2 physical properties of ice.
cold, hard, solid, wet, etc
Type of change where a new substance is created.
CHEMICAL CHANGE
Name a food that is an example of a physical change.
salad or trail mix
Name a food that is an example of a chemical change and explain why.
A cake, because you cannot turn a cake back into the eggs, flour, sugar, etc. that you mixed together
These molecules can move freely and will take the shape of any container you put them in.
LIQUID
Name 2 physical properties of water.
liquid, wet, odorless, etc.
A type of change where the substance stays the same, but size and shape may change.
PHYSICAL CHANGE
Explain how water could be an example of a physical change.
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.
FALSE. To make peanut butter, you grind up roasted peanuts, so nothing new is being created.
These molecules move rapidly and freely whereever there is open space.
GAS
Explain how iron fillings and sand can be separated using physical properties.
iron is magnetic and sand is not, so you can use a magnetic wand to separate the two substances
This type of matter keeps a definite shape.
SOLID
CHALLENGE (not a quiz question): Explain how the water cycle an example of a physical change.
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.
The fuel combines with another chemcial to produce large volumes of a hot gas that propel the rocket into space.
Identify 1 example of a solid, liquid, and gas.
Solid- desk, book; Liquid- water, lemonade; Gas- helium, air
CHALLENGE (not on quiz). We can separate salt and water using physical properties. What do we call this process of evaproating the water to separate the salt?
DESALINATION