Signs of Chemical Reaction/Change – NOTES – Lesson 1
Chemical Reaction
- Elements react and bond together to form a
molecule during a chemical reaction.
- A chemical reaction is the process that leads
to the change of one set of chemical
substances into another.
- Molecules can break down into pure
elements or change into different molecules
during a chemical reaction as well.
- A chemical reaction is a chemical change.
- During a chemical change, one set of substances transforms into different
chemical substances with different properties.
- During a chemical reaction, a chemical change takes place. New
substances are formed with different properties.
- The substances that undergo the transformation are called the reactants.
- The substances that form during a chemical reaction are called products.
- Atoms interact with each other during a chemical reaction. During this
interaction, bonds between atoms are created and/or broken.
- New substances are formed because bonds between atoms are created
and/or broken.
- You cannot actually see bonds forming or breaking during a chemical
reaction.
- However, you might observe certain things that indicate a chemical
change is taking place
Observing a Chemical Reaction
- There are 6 observations you might make to indicate a chemical change
(and thus, a chemical reaction) is taking place:
- These changes indicate a new substance with different properties has
formed.
Signs of a Chemical Change/Reaction
1. A precipitate forms. A precipitate is when two liquids react & a solid forms
at the bottom of the container.
2. Light. A burst of light or spark appears.
3. Temperature change. The temperature of the substance changes.
4. Bubbles appear. Bubbles indicate a gas has formed.
5. Odor. An odor develops.
6. Color change. The color of the substance changes.
Signs of Chemical Reaction/Change – NOTES – Lesson 1
Chemical Reaction
- Elements ____________and ____________together to
form a molecule during a
________________________.
- A chemical reaction is the _______________that
leads to the ____________of one set of ____________
_________________into another.
- Molecules can break down into ________________________or ____________
into different _________________during a chemical reaction as well.
- A chemical reaction is a ________________________.
- During a chemical ____________, one set of substances _______________into
____________ chemical substances with different _________________.
- During a chemical ______________, a chemical ____________ takes place.
New substances are formed with ________________________.
-
The substances that undergo the transformation are called the ____________.
The substances that form during a chemical reaction are called ____________.
- ___________interact with each other during a ____________ __reaction.
During this interaction, bonds between atoms are ____________ and/or
____________.
- New substances are formed because ____________ between atoms are
____________ and/or ____________.
- You cannot actually ________bonds forming or breaking during a
chemical reaction.
- However, you might observe certain things that indicate a ____________
____________ is taking place
Observing a Chemical Reaction
- There are ________________________you might make to indicate a
chemical change (and thus, a chemical ________________) is taking place.
- These changes indicate a new _________________with different properties
has formed.
Signs of a Chemical Change
1. A ____________________ forms. A precipitate is when __________________
react & a ______________ forms at the______________ of the container.
2. ____________. A burst of ____________or ____________appears.
3. _________________________. The temp. of the _________________ changes.
4. ________________________. Bubbles indicate a _________has formed.
5. ____________. An odor ____________________.
6. ________________________. The color of the _________________changes