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Science Ch. 2
Density:
D = m/v
Always expressed in g/mL
Quantitative
ex: Identifying 4 metal object lab
Viscosity
Resistance to Flow
Can vary with temperature
Qualitative
ex: shampoo and water
Conductivity
A materials ability to allow heat to flow/ travel
Quantitative
ex: any metal object
Malleability
The ability of a solid to be hammered without shattering
Brittle objects shatter
Qualitative
ex: piece of zinc
Hardness
Comparative test between two objects to see which one will scrape/ scratch the other
Qualitative
ex: zinc and aluminum
Odor
What something smells like
Test by wafting
Qualitative
ex: water vs. alcohol
Physical Properties
Any characteristics of a material that can be observed or measured without changing the composition of the substances in the material.
Melting Point
The temperature at which a substance changes from solid to pure liquid.
Boiling point
The temperature at which a substance boils.
Filtration
A process that separates materials based on size of the particles.
Distillation
A process that separates the substances in a solution based on their boiling points.
Physical Change
When some of the properties of a material change, but the substances in the material stay the same.
Evaporation
when a liquid is turned in to vapor or to its original form as a solid by heat
Chart
Flammability
a materials ability to burn in the presence of oxygen
Reactivity
the property that describes how readily a substance combines chemically with other substances
Chemical change
chemical change occurs when a substance reacts and forms 1 or more new substances
4 common types of evidence for a chemical change are a change in in color, the production of a gas, the formation of a precipitate and temperature change
Question #1
I have water and sand mixed together. What separation technique should be used?
Question #2
I have oil and vinegar mixed together in a glass. What separation technique should be used?
Question #3
What is a chemical change
Question #4
What are the MELTING, FREEZING, and BOILING points?
Question #5
What are the 4 ways to recognize a chemical change?