Matter Quiz #2 Flashcards
The basic unit of matter, composed of a nucleus surrounded by electrons
Atom
Groups of atoms held together by chemical bonds
Molecule
Substances made up of different elements bonded together
Compound
Mass (matter) is neither created nor destroyed, in ordinary chemical and physical changes
Law of Conservation of Mass
What is a Physical Change
- A change in the size, shape, or state of matter of a substance
- No new substance is being created
The following are examples of what type of change?
- Cutting
- Pulling
- Pushing
- Twisting
- Bending
- Freezing
- Melting
- Evaporating
Physical Change
What is a chemical change?
A change in which one kind of matter changes into a different kind of matter.
The following are examples of what type of change?
- Burning
- Fireworks
- Baking Soda and Vinegar
Chemical Changes
What are the signs of a chemical change?
- Change in color
- Produces smell
- Releases gas
- Change in temperature (not including a phase change)
What type of change is cracking an egg?
Physical Change
What type of change is cooking an egg?
Chemical Change
What type of change is splitting wood?
Physical Change
What type of change is burning wood?
Chemical Change
What type of change is rusting metal?
Chemical Change
What type of change is smashing ice?
Physical Change
What type of change is melting ice?
Physical Change
What type of change is boiling water?
Physical Change
What type of change is cutting a cucumber?
Physical Change
What are the steps to Balance Equations?
1) Determine the different chemical elements found in the equation
2) Determine the number of atoms each element has in total on each side of the “yields”
3) Compare the total number of atoms on the left to the total number of atoms on the right.
- If they are equal, the equation is balanced
- IF they are unequal, the equation is unbalanced.
