Topic: Describing Matter • Matter • Describing Matter – Composition – Properties • Anything that has mass and takes up space. • Chemical makeup – – Water = H 2 0 – Sugar = C 6 H 12 O 6 • Physical and chemical properties
Jan 02, 2016
Topic: Describing Matter
• Matter
• Describing Matter– Composition
– Properties
• Anything that has mass and takes up space.
• Chemical makeup –– Water = H20
– Sugar = C6H12O6
• Physical and chemical properties
• Physical Properties
– Extensive – those that change with the size of the sample
– Intensive - those that remain the same regardless of the size of the sample.
- A characteristic of a substance that can be observed or measured without changing the substance.
- Color _________- Shape _________- Volume _________- Density __________- Texture __________- Melting point ________- Boiling point ________
- Generally things we can measure or see with our senses.
• Chemical Property
• Chemical properties are intensive
• A property that describes how a substance changes into a new substance
– Flammability– Reactivity
• Processes that involve a chemical propetyBurning
Rusting
Rotting
Baking
Back to Physical Properties
- A characteristic of a substance that can be observed or measured without changing the substance.
- color- smell- shape- volume- density- texture- melting point- boiling point
Topic: Density
1. Definition of density
2. Most commonly used metric units for density
• The amount of mass in a given volume of a substance– Mass in grams – Volume in cm3
g or g
cm3 ml
solids liquids
Calculating Density
• To determine the density of a material you must find its volume and mass.
Density = Mass ÷ Volume
Here is a problem
What is the density of a cube with a volume of 12cm3 and a mass of 6.0 g?