Vocabulary
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.
True or False. A molecule is the smallest unit of matter.
What is FALSE?
How do you calculate the density of something?
What is mass / volume?
These are the characteristics of an object. If not chemically reacted they will stay the same in pure substances.
What are PHYSICAL PROPERTIES?
Is baking soda and vinegar an example of a physical change?
What is NO? When you mix baking soda and vinegar, bubbles form, which indicates a chemical change as taken place.
Name three elements you know of.
What are any element from the periodic table?
What are three ways you have been able to PHYSICALLY separate a mixture?
What are magnetism, filtration, and boiling?
Type of change where a new substance is created. No original properties are kept.
What is a CHEMICAL CHANGE?
Name a characteristic that is an example of a physical change.
Change in shape, melting, boiling, freezing, change in amount. Anything that doesn't change the chemical compound of substance.
Name a food that is an example of a chemical change and explain why.
What is a cake, cookies or bread, because you cannot turn it back into the eggs, flour, sugar, etc. that you mixed together?
TRUE / FALSE: Molecules are made up of two or more atoms.
What is TRUE?
How many milligrams are in 1 gram of salt?
What is 1000 milligrams?
A type of change where the substance stays the same, but size and shape may change.
What is a PHYSICAL CHANGE?
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.
TRUE / FALSE: Molecules can also be classified as Compounds.
What is TRUE?
Convert 0.65L of soda to mL.
What is 650mL of soda?
What qualifies as a pure substance?
Element and Compound
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 car engine is an example of a chemical change.
What is the fuel combines with another chemical to produce a combustion reaction with large volumes of a hot gas that propel the car forward?
Make a comparison between Molecules and Compounds, how can we tell the difference between them?
What is molecules contain two or more atoms of the same or different type. Compounds are only chemically combine with two or more different types of atoms?
CHALLENGE: Convert 90,973mg of sugar to kg. WITH ONLY 3 Significant Figures (hint you need two conversion factors)
What is 0.091kg?