Polymers & Composites
All polymers are made out of __________.
Monomers
Name a property of metals.
Answers may vary.
Ceramics have to be heated to what tempreature in order to be made?
The atomic nuclei of unstable isotopes release fast-moving particles and energy is called_______ ______.
Radioactie decay.
What radioactive ray penetrates through paper but not aluminum sheets?
Beta
Name the three types of shapes that Polymers form?
Straight chain, branched chain, and ring.
Name one use of stainless steel that we see in daily life.
Tableware, cookware, surgical instruments, etc.
Name 3 properties of glass.
Clear, made into many shapes and colors, and can't be penetrated by liquids.
Explain the process by which Henri Becquerel discovered radioactivity.
Placed undeveloped film in a drawer with uranium.
The ______-______ of an isotope is the length of time needed for half of the atoms of a sample to decay.
Name one natural polymer and one synthetic polymer then give the uses of each.
What metal/alloy is used in the windshield of airplanes that help keep it frost-free due to its electrical conductivity?
Gold
What are optical fibers and why are they important?
Threadlike piece of glass that allows light to transmit through them. They are used in our daily lives in the forms of telephone connections, wifi, and TV's.
Name the three types of decay.
Alpha, beta, and gamma.
What element forms the backbone for most polymers?
Carbon
Name one benefit and drawback of using synthetic polymers.
Benefit: Inexpensive, strong and last a long time. Drawback: Cheaper to make new ones than old one, can lead to more trash.
Why are alloys usually used more than pure metals?
They are generally stronger and less likely to react with air/water.
How is glass made?
Melting sand and then mixing the mixture with other compounds. Then using air to blow them in to shapes or use tools to shape them into desired design.
Scientists use ________ to follow the steps of chemical reaction or industrial process.
Tracers.
What natural polymer is found in snake venom, spider's silk and some fruits?
Cellulose.
Define Polymer
A large complex molecule built from smaller molecules joined together in a repeating pattern.
How are alloys made? Name the 2 ways they are created.
1. Melting metals together and then heating them under high pressure.
2. Titanium can be bombarded with nitrogen ions to be make a stronger alloy.
What properties of ceramics allow them to be used in a multitude of things?
Resist moisture, don't conduct electricity, and withstand high temperature.
Radioactive isotopes can be used to do what kind of things?
Determine the age of natural materials on Earth, tracing the steps of chemical reactions and industrial processes, diagnosing and treating diseases, and providing sources of energy.
What is the half-life of Carbon-14?
5,730 years.