Chemical/Physical Properties
Molecules fill the container they are in, No fixed structure
What is a Gas?
Oxidization is an example of what ____?
What is a chemical change?
1st Step in the Engeering Proces
What is "state the problem"
True or False: To identify an unknown substance, you only need its chemical properties
False
water
Pure substance - Compound
Molecules will take the shape of the container they are in. maintains a fixed volume
What is Liquid?
Lithum placed in water, gives of smoke and sizzles
Chemical Changes
The package must be made from 60% natural materials.
This is an example of ______?
What is Constraint?
deciding whether the drawbacks of a given design outweigh its benefits is the definition of...
Tradeoff
Able to be separated using physical means
Mixture
Something that can be measured without changing the identity or composition of matter is ____?
What is a Physical Property?
Precipitation Developing is an example of _____?
What is Physical Change?
Last step in the engineering process
Evaluate test results using criteria and constraints
Property to use for separating water and oil
Density
Chemically combined substance
Pure substance
Property specific to a substance, example:buoyancy
Intensive Property
A chemical ______ of a substance can be determined by observing a chemical ______.
What is Chemical Property and Chemical Change?
Ability to breakdown quickly is an example of
Criterion
Identifies ways the materials can be used. Is the study of the physical, and chemical properties of matter.
What is Chemistry?
Blood is an example of this type of mixture
Heterogenous mixture
Depends directly on the amount of substance present. Example: amount of energy
Extensive Property
Describe the difference between a physical and chemical change
Chemical changes the identity of the substance, physical does not change the identy
The 7 steps of the engineering process
1. state the problem
2. research problem
3. identify criteria/constraints
4. model solutions
5. consider tradeoffs
6. design/test prototype
7. evaluate test results
List and define two parts of a system
Possibilities: Input, Output, Inside system boundaries, Outside system boundaries,
Stainless steel is an example of this type of mixture
Homogenous mixture