Name: __________________________________________
UNIT 4: Chemical Reactions Note Taking Document
Guidelines for making and writing observations:
1.
Describe as many properties as you can.
2. Record detailed information that might help a chemist identify the substance.
3. Use descriptive words (such as thick, pink liquid) rather than imprecise language.
For example, DO NOT SAY, “light-colored stuff.”
4. Avoid opinions (such as looks gross)
Vocabulary:
-
______________: something that can be __________ about a substance
such as its color, smell, or boiling point.
1.
Chemists rely on some properties that can only be observed under ____________
__________ such as _________ and __________ points.
2. Different substances have ____________ melting and boiling points. Therefore, it is
a ______________ that could be used to help ___________ a substance.
3. __________
_________ is the temperature at which a solid will begin to melt
and turn into a liquid.
4. ___________ ________ is the temperature at which a liquid will begin to boil and
turn into vapor.
PHYSICAL CHANGE
1.
Physical changes may change the state of matter but the substance
______ ______ change.
-
Atoms do _____ change.
-
No new _________ form.
-
The state of matter or shape may _________.
-
Can be ________.
CHEMICAL CHANGE
1.
Chemical changes create an entirely ___________ substance. Referred to as
_______________ ________________.
-
Brings about something _______.
-
The chemical bonds of the molecules _________ and they reform in a
different manner.
-
Chemical changes ____________ be undone.
Key Concept
1.
Different substances have ________________ properties.