Learn.
The following are some general formulas for chemical reactions you should get used to seeing.
A chemical reaction usually has one or many of the following:
- Color Change.
- Production of an odor.
- Change of Temperature.
- Evolution of a gas (formation of bubbles)
- Precipitate (formation of a solid)
A physical change does not result in a chemical reaction, it is important to differentiate between the two.
The following are some chemical reactions you should become familiar with over the year.
Oxidizing magnesium
Sodium + water
General reaction of metals + acid
Master.
Question 1.
When you chop wood, is this an example of a chemical reaction or a physical change.
Question 2.
When you burn toast, is this an example of a chemical reaction or a physical change.
Question 3.
Metals and acids produce hydrogen gas, you can test for hydrogen gas using the pop test, this is when you burn hydrogen in oxygen. What do you think is created in this process.