Fichas
Week 3
Fichas del conjunto (23)
- 1MetalsInorganic material, comprised of one metallic element, can contain non-metallic elements.
Ferrous (Iron based), non-ferrous and alloys.
Good electrical and thermal conductors. - 2CeramicsInorganic material, made up of metallic and non-metallic elements.
Originally clay based.
Held in ionic and covalent bonds. - 3PolymersLong molecur chains or networks with a carbon backbone. Very
- 4What do we call an atom where the number of protons and electrons are not equal in number?Ions
Missing electrons it's positively charged. Extra electrons it's negatively charged. - 5How is the molar mass for a compound found?Top # is the # of protons / electrons
Bottom # is atomic mass (protons + neutrons)
Find the atomic mass, grams per 1 mole
( 6.022 x 10^23 ) - 6Define Avogadro’s number and molar mass6.022 x 10^23
The mass of 1 mole
g/mol - 7Define valency in terms of electronsElectrons in the outer shell
Form bonds with adjacent atoms
Determines the number of bonds formed
Number of unpaired electrons
Charge of the atom - 8Valence electrons in a: Conductor Semiconductor InsulatorConductor 1 - 3
Semiconductor 4
Insulator 5 - 7
(Nobles Gases have 8, non-reactive) - 9Describe the following in terms of atomic structure; Metallic bonding Covalent bonding Ionic bonding Ionicitya
- 10Describe the following in terms of atomic structure; Metallic bonding Covalent bonding Ionic bonding Ionicitya
- 11Describe thermosetting and thermoplastics in terms of their bonding structuresa
- 12A nickel wire is 0.9mm diameter and 100 mm long. How many atoms does it contain?Work it out..
Ans 5.81 x 1021 - 13What are the atomic percentages of carbon and iron in steel with 98% ironWork it out..
Ans. Fe 91.3%, C 8.7% - 14Discuss how iron and steel are made in most other parts of the world. Discuss how iron and steel are made in New Zealand.a
- 15Explain the reasons for adding lime to the mix when making iron – discuss the chemistry of the reactiona
- 16What is the main source of aluminium and how is it extracted into a usable metal?a
- 17How is zinc obtained and refined?a
- 18Briefly explain how copper is extracted from the raw materiala
- 19What are the four typical grades of commercial copper and give uses for each gradea
- 20Describe three possible metal casting defects and how they can be avoideda
- 21Compare the crystal structure of cast metals with cold rolled metals and discuss the effects that these havea
- 22What are the effects on crystal structure in metal forgings?a
- 23Describe two of the processes used to produce industrial ceramics giving examples for eacha
Información
- Descripción
- University Materials Science Fichas sobre Week 3 , creado por Hugo James el 01/10/2015.
- Creado por
- Hugo James
- Visitas
- 2
- Valoración