Atoms, Molecules, Etc.
Proton
Neutron
Electron
Positive - Proton
Neutral - Neutron
Negative - Electron
A characteristic of a pure substance that can be observed without changing it into another substance
Physical Property
The two types of chemical change are:
A _______ change occurs when matter changes form, but no chemical reactions occur, and no new substances are produced.
physical
A baker is baking cinnamon rolls - select all that are examples of a chemical change?
a. it changes to a golden brown
b. its doubles in size
c. it has a sweet smell
d. cinnamon spreading
a. it changes to a golden brown
b. its doubles in size
c. it has a sweet smell
_____ are the basic building block of all matter and are very small.
Atoms
Name three types of physical properties.
Viscosity, Density, Conductivity, Malleability, Hardness
What is true about a chemical property?
a. can only be observed when the substances in a sample of matter are changing into a different substance
b. can be a result of a flammability or reactivity
c. any ability to produce a change in the composition of matter
d. all of the above
d. all of the above
A chemical change occurs when a new ______ is formed through a ______.
substance, reaction
Imagine you placed chocolate chips in a bowl and placed it in the microwave. The chocolate chips melt after being in the microwave for 1 minute.
Is this a physical or chemical change and why?
It is a physical change because it only changed it state of matter (solid to liquid) and did not change the actual chocolate.
____ are substances that are made up of only one type of atom
What is the difference between malleability and hardness?
Malleability is the ability to be hammered with shattering whereas hardness is describing how the object can be scratched.
The Statue of Liberty is an example of chemical change. What chemical property does it have that made it change color?
Oxidation - the chemical copper changes to green when it is exposed to oxygen and other elements.
Signs of Chemical Change include all BUT:
a. Color changes
b. Explosions
c. Change in size
d. Produces an odor
c. change in size
Cooking an egg is an example of kind of change?
Chemical Change
What is the difference between a compound and an element?
A compound is made up of two or more elements and an element is made up of only one type of atom.
The greater the viscosity, the _____ the liquid move.
a. faster
b. slower
b. slower
Describe the chemical properties of wood - how can its chemical properties affect it?
Answers may vary:
Flammability - easy to burn
Why is rusting considered a chemical change?
Water and oxygen react with metal which creates a new substance.
Why is freezing water to create ice considered a physical change?
Answers may vary -
Freezing water can be reversed
It's still water in each type of matter
What is a Mixture?
A mixture contains two or more substances that are not joined together.
True or False:
Physical properties remain the same for all pure substances
True
Name a specific example of a chemical change.
Answers may vary
If ripping paper is considered a physical change, what could we do to the paper to make it have a chemical change?
Burning it, answers may vary
Name an example of a physical and chemical change in cooking. (be specific!)
Answers may vary