Final Flashcards
58 True/False
The concept of an atom is 1 hundred years old?
False: several thousands
Robert brown came up with the idea that atoms vibrate.
True: Brownian motion
All materials burn at the same color
False: It depends on the atom
The number of electrons equal the number of neutron.
False: protons
Aluminum is a solid.
False: an Amorphous liquid
A crystal is a ionic bond.
False: coordinate covalent bond
Metals are usually single elements.
False: usually alloys
Specific gravity is the density of a material divided by the density of the weight. A comparison to the specific gravity of water.
True
Pure metal has a specific melting point you can look up.
True
Specific heat is the amount of calories you have to add to raise the material up by one degree of heat.
True
Silver is a better conductor of heat than aluminum
True
Silver conducts heat better than steel.
True
Thermoexpansion is how much something expands to heat.
True
All materials expand through thermoexpansion.
False: Antimonie contracts
A good conductor of electricity is not a good conductor of heat
False: A good conductor of heat is a good conductor of electricity
Copper is a good conductor of electricity and heat
True
Crystalline structure of a material determines the corrosion resistance of the material.
False: The chemical makeup
Adding a lot of carbon to steel increases the temperature to freeze it.
False: it goes down
If you add 1 degree of carbon the temperature to freeze steel increases.
True
Tensile strength is the ability of a material to push together
False: Stretch apart
Yield strength is the force to deform a material
True
Fracture strength is the force required to break a material.
False: The ability to break a material divided by the cross sectional area.
Ductility is the percent of elongation and percent of material that elongates in two inches of pull
True
Hardness is resistance to indenting
True
Compression strength is the resistance to compression
False: and stressing (push or pull)
Cooling steel produces ferret, perlite, and cementite crystalline structures.
True
Cooling steel slowly produces cementite and ferret structures.
False: cementite and perlite
Cementite is made of iron-carbon
True
Sulfur is always in carbon-steel
True
An alloy of steel contains chrome.
False: contains 1.65 percent manganese or .6 percent copper.
Annealing steel requires heating the material above critical range then cooling the material slowly.
True
An ossetintite structure is produced when annealing steel and is very sturdy.
False: Malleable
Perlite is a combination of ferret and concretite.
False: ferret and cementite
Ferret has oxygen in it.
True: iron oxide
Tempering steel requires heating the material below the transformation range.
False: above
Ferret steel contains chromium and carbon
True
Osstenthetic steel is the same as ferretic steel.
False: It has nickel in it
Martenistic steel has lower carbon then ferretic steel.
False: Higher carbon
You cannot weld cast iron
False: you can
The first two digits on steel is the percent of carbon
False: The alloy
The second two digits on steel is the percent of carbon
True
A bolt with three lines on top is medium carbon steel
True
A black bolt is high carbon steel
True
No lines on a bolt is medium carbon steel.
False: Low carbon
A bolt with 10.9 is low carbon steel.
False: medium carbon steel
You can make aluminum stronger by hot rolling the aluminum.
False: cold rolling
You can drill, mill, and bend casting alloys of aluminum.
False: They will break
The first number on aluminum tells you the percent of aluminum in it.
True
A 1 on aluminum is telling you that the material is 99 percent or greater of aluminum.
True
A 2 as the first number on aluminum tell you that it has zinc in it.
False: Not zinc
The danger of drilling steel fast is the effect of anneeling occuring on the material.
True: it will make the material weaker
Plastics are polymers of carbon and are malleable.
True
Plastics are classified using structure and backbone polymer or side chains.
True
Thermoplastics change chemical structure when they are heated.
False: They do not change
Polypropylene will change its chemical structure when heated.
False: It is a thermoplastic
Polypropylene and nylon have the same chemical structure.
False: Nylon has nitrogen in it.
The ways to remove heat from the body are radiation, evaporation, conduction, convection, and behavioral adaption.
True
Apocrine sweat glands release oils.
True
The best way for your body to release heat is convection.
False: Radiation
The best material for your body is a wicking material like synthetic cotton blends.
True
Fiberglass makes a strong tensile strength material.
True
