Then we will practiced those skills, plus took it a step further by causing a physical change to a substance and then re-examining those properties to see how (and if) they were affected. (Post-Lab Analysis/Conclusion/Reflection - 10 Questions - Due at Start of Class Tomorrow)
We discovered that no matter how we bent, cut, broke, flattened, or shaped the amorphous solid, changing it's mass and it's volume in the process, it's density remarkably stayed the same! That means that density is a characteristic property (one which can be used to identify an unknown substance) and what's known as an intensive property, meaning it stays the same even if the size of the sample changes.
Next week, we'll be conducting a Lab investigation into chemical properties, and we'll once again observe the effects of changing a sample size.
KEY TERMS & CONCEPTS:
- The volume of an irregularly shaped solid may be measured using water displacement.
- Density is the ratio of mass to volume, and as a ratio, does not change if the mass and volume change.
- All matter has both physical and chemical properties. Some properties are characteristic, and may be used to identify an unknown substance.
- Physical properties may be intensive or extensive.
- Density is an intensive, characteristic physical property.
HOMEWORK: Post-Lab Analysis/Conclusion/Reflection - 10 Questions - Due at Start of Class Tomorrow