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Material Science and Chemistry IntroductionMaterial Science deals with the relationships that exist between the structures and properties of materials, which are useful in practice of engineering profession.

Chemistry is the study of matter and its properties, the changes that matter undergoes, and the energy associated with those changes.

2qUEstion no.1Materials according to its structure, which of the following is based on covalent bonding?MetalsSemiconductorsCompositesCeramics

3qUEstion no.2A thin steel ruler is easy to bend and it springs back when released. What property of material defines this action?elastic stiffnessductilityyield strength tensile strength

4qUEstion no.3The properties of a material change with temperature, usually for the worse. What material is known to have a low maximum service temperature?CompositesPolymersSemiconductorsCeramics

5qUEstion no.4Which of the following contains both metallic and nonmetallic elements and typically good insulators to passage of both heat and electricity?AlloysCeramicsPolymersComposites

6qUEstion no.5Fiberglass is an example of what type of material?PolymersCompositesAlloysMetals

7qUEstion no.6Electron and protons are negative and positive charges respectively, and with the same magnitude equal to how many Coulombs? 1.6 x 10-19 2.3 x 10-212.3 x 10-231.6 x 10-27

8qUEstion no.7In atoms, the unit of mass is known as atomic mass unit (amu). 1 amu is equivalent to how many kilogram?1.66 x 10-272.33 x 10-233.11 x 10-214.55 x 10-19

9qUEstion no.8Neutrons and protons have very similar masses, roughly equal to how many amu?0.11.010100

10qUEstion no.9Which of the following is true about the mass of an electron?a. It is negligible with respect to those of the proton and the neutron.b. It is 10 times greater than that of a proton.c. It is equal to the mass of nucleus.d. It is 10 times less than that of a neutron.

5.486 x 10-4 amu11qUEstion no.10It is the amount of matter that has a mass in grams equal to the atomic mass in amu of the atoms.MoleculeMoleAtomic weightMolecular mass

amu = grams/mol12qUEstion no.11The Carbon nucleus has 6 protons and 6 neutrons, what is the mass in a one mole of Carbon?3 grams6 grams9 grams12 grams

Mass of proton = neutron = 1 amu13qUEstion no.12Avogadros number defines what?The number of atoms in a mole.The number of free electrons in an atom.The mass of a compound.The molecular weight.

Nav = 6.023 1023. Note that Nav = 1 gram/1 amu.

14qUEstion no.13If two elements A and B combine to form more than one compound, the mass of B that can combine with a given mass of A are in the ratio of small whole numbers. This is known asLaw of chemical combinationLaw of conservation of massLaw of multiple proportionsLaw of constant composition

15qUEstion no.14Which of the following defines the atomic number of any particular element? It is the number of protons in an atom.It is the number of neutrons in an atom.It is the discovery sequence.It is the mass of an atom.

16qUEstion no.15From the given chemical symbol, How many electrons, protons, and neutron are there in an atom? 197, 197, 7979, 79, 19779, 79, 118197, 197, 118

17qUEstion no.16Currently, how many elements are known?98108118128

18qUEstion no.17It is a matter that has distinct properties and a composition that does not vary from sample to sample.SolutionsSubstanceCompoundMixture

19qUEstion no.18Which of the following is an example of intensive property of matter?MassVolumeMelting pointShape

20qUEstion no.19It is a method to separate the needed component from a heterogeneous mixture by using acid to dissolve the other components?DistillationFiltrationChromatographyEvaporation

21qUEstion no.20Naturally occurring chlorine is 75.78% 35Cl and 24.22% 37Cl. What is the atomic weight of Chlorine?71.99 amu35.48 amu54.56 amu67.28 amu

22qUEstion no.21In the periodic table of elements, the non-metallic elements are located in what part of table?Right sideMiddleLeft sideBottom

23qUEstion no.22What formula is used to indicate the actual numbers of atoms in a molecule?Structural formulaChemical formulaMolecular formulaEmpirical formula

HO ----24qUEstion no.23In a chemical reaction, electrons are removed from or added to an atom and formed a charged particle known as AnionCationIonElectrodes

25qUEstion no.24In general, what is the reaction of metallic atoms during a chemical process?a. It tends to lose electrons.b. It tends to accept electrons.c. It tends to maintain its electrons.d. It tends to either lose or accept electrons.

26qUEstion no.25It is an ion consists of atoms joined as in a molecule, but they have a net positive or negative charge.Ionic compoundPolyatomic ionMolecular ionIonic molecule

27qUEstion no.26The ionic compounds are generally formed from what?combination of metals and non-metalscombination of metals only combination of non-metals onlycombination of any elements

28qUEstion no.27The molecular compounds are generally formed from what?combination of metals and non-metalscombination of metals only combination of non-metals onlycombination of any elements

29qUEstion no.28Which of the following is an ionic compound?N2ONa2OSF4P4O6

30qUEstion no.29More than 97% of the mass of most organisms is made up of just six elements, which of the following is not belong?Oxygen and HydrogenCarbon and PhosphorusNitrogen and SulfurIron and Calcium

31qUEstion no.30Fe2+ is a cation and read asFerric ionIron ionIron2 ionFerride ion

32qUEstion no.31What is the chemical formula for potassium sulfide which is consist of K+ and S2- ions?KS2KS3K2SK2S2

33qUEstion no.32An acid is composed of an anion connected to enough _____ ions to neutralize the anions charge.H+O+S+Cl+

34qUEstion no.33N2O4 is a molecular compound and read asNitro OxideNitrous OxideDinitrogen TetroxideNitride Tetroxide

35qUEstion no.34The simplest class of compounds that contain only carbon and hydrogen are calledHydrocarbonsAlkanesOrganic compoundsInorganic compounds

36qUEstion no.35An H atom in Alkanes is replaced by an OH atom, what will be the result?AlcoholHydrocarboxideAlkalinesMethanol

37qUEstion no.36It is the area of study that examines the quantities of substances consumed and produced in chemical reactions.a. Chemical Nomenclatureb. Stoichiometryc. Organic chemistryd. Inorganic chemistry

38qUEstion no.37Which of the following is a balanced chemical equation?a. CH4 + O2 CO2 + 2 H2Ob. 2H2 + O2 2 H2O2c. O2 + 2 NO 2NO2d. 2Fe + O2 Fe2O3

39qUEstion no.38__C2H4 + __O2 __CO2 + __H2OFrom the given equation, what coefficients will make the equation balance?4, 3, 1, 22, 1, 3, 21, 3, 2, 22, 3, 1, 2

40qUEstion no.39Calculate the formula weight of a sucrose, C12H22O11 (table sugar).176 amu342 amu144 amu210 amu

41qUEstion no.40What is the percentage of Carbon by mass in C12H22O11 (table sugar)?42.1 %6.40 %51.5 %32.8 %

42qUEstion no.41Calculate the number of H atoms in 0.350 mol of C6H12O6.6.02 x 10234.28 x 10232.53 x 10241.38 x 1024

43qUEstion no.42What is the molar mass of glucose, C6H12O6?180 g/mol96 g/mol72 g/mol12 g/mol

44qUEstion no.43Calculate the number of moles of glucose (C6H12O6) in 5.380 g of C6H12O6.0.02989 mol0.05871 mol0.08751 mol0.07815 mol

45qUEstion no.45Calculate the mass, in grams, of 0.433 mol of calcium nitrate, Ca(NO3)2.71.1 g61.1 g51.1 g41.1 g

46qUEstion no.46Calculate the number of copper atoms in a mass of about 3 g of 100% copper:a. 32.25 x 1021 b. 30.12 x 1021c. 28.44 x 1021d. 26.18 x 1021

47qUEstion no.47Ascorbic acid (vitamin C) contains 40.92% C, 4.58% H, and 54.50% O by mass. What is the empirical formula of ascorbic acid?a. CH4O2b. C2H3O2c. C3H4O3d. C3H2O3

48qUEstion no.48What is the number of C atoms per cm3 given its density to be 1.8 g/cm3? 8 x 10229 x 102210 x 102211 x 1022

49qUEstion no.49It is a solid composed of many crystalline grains, not aligned with each other,. a. Polycrystallineb. Single crystalc. Amorphousd. Non-crystalline

50qUEstion no.50Primary bonds are relatively stronger and exists in almost all solid materials. Which of the following is not an example of primary bonds?Ionic BondsCovalentMetallicVander waals forces

51qUEstion no.51It is the building block of a crystal structure.LatticeCellIndexMer

52qUEstion no.52When a polymer has one kind of mers in its structure, it is called asMonomerIsomerHomopolymerCopolymer

53qUEstion no.53Which of the following is not a polymer structure?LinearBranchedCross linkedCurvilinear

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