HOMEWORK HELP AND TUTORING ,ALL KIND OF QUIZ AND EXAMS WITH GUARANTEE OF AN A+ PASS

large molecules often contain carbon. why? - ANSWER they can readily form bonds with other carbon atoms. this forms a 'backbone'. other atoms can then attach. describe benedicts test for reducing sugars - ANSWER add equal volumes of the sugar sample and benedicts reagent. heat the mixture in a water bath for 5 minutes. brick red precipitate will form. what is a reducing sugar? - ANSWER a sugar that can reduce (give electrons to) another chemical. describe the benedict...

What is meant by work function (2) - ANSWER Minimum energy required by an electron to escape from (1) a metal surface (1) What is meant by ionisation energy? (2) - ANSWER Minimum energy required to remove an electron from an atom (1) from the ground state (1) Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) - ANSWER Energy of a photon is fixed/constant (1) Energy is required for electrons to overcome work function ø (1) Electrons deeper...

what colour is {Fe(H2O)6}2+ - ANSWER pale green Transition Metal definition - ANSWER D block elements that form at least one stable ion with a partially filled d orbital Classic elements which are not transition metals despite being D-Block elements - ANSWER Scandium and Zinc properties of transition metals which are NOT shared by other metals - ANSWER multiple oxidation states -coloured ions in solution -great catalysts -form complexes with ligands ligand - AN...

Bronsted-Lowry acid - ANSWER a proton donor. Bronsted-Lowry base - ANSWER proton acceptor What is H3O+? - ANSWER hydronium ion definition of pH - ANSWER -log10[H+] How do you get [H+] from ph? - ANSWER 10^(-pH) the ionic product of water - ANSWER [OH-][H+] Is dissociation an endo or exothermic reaction? - ANSWER endothermic Why is the concentration of water not included in Kw? - ANSWER The concentration of water is so large and constant the equilibriu...

How can we make polymers more flexible? - ANSWER By adding a plasticiser How do plasticisers make polymers more flexible? - ANSWER They stick between the chains and keep the polymers further apart from each other, weakening the van der Waals forces and lets chains slide more easily. Uses of Kevlar - ANSWER bulletproof and used in body armour. Uses of Nylon - ANSWER commonly used in textiles. Why are polymers strong? - ANSWER Polymers are bound by van der Waals for...

Water removed from the reactants Condensation The addition of water to the reactants Hydrolysis Add 2cm³ of food sample (in solution). Add 2cm³ of benedict's Reagent. Heat the solution in a water bath for 3 minutes. Change from blue to brick red. CuO formed Test for Reducing Sugars Add 2cm³ of food sample.Add 2cm³ of dilute HCL then heat.Add 2cm³ of NaHCO3.Then do test for reducing sugars. Non-Reducing Sugars Add drops of iodine to starch solution. Colour change to blue-bla...

What is the area of the composite figure? 70 cm2 100 cm2 105 cm2 130 cm2 - ANSWER B. 100 cm2 What is the area of the shaded portion of the circle? (16π - 32) in2 - ANSWER A. (16π - 32) in2 A carpenter is making a wooden window frame that has a width of 1 inch. How much wood does the carpenter need to build the frame? 5.5 + 106 square inches 5.5 + 116 square inches 5.5 + 153 square inches 5.5 + 162 square inches - ANSWER A. 5.5 + 106 square in...

Which gain will increase the risk of bioeffects? a. transmit b. receive c. gain d. overall gain - CORRECT ANSWER a. transmit Which of the following is considered the memory of an ultrasound instrument? a. pulser b. transducer c. receiver d. beam former e. digital scan converter f. display monitor - CORRECT ANSWER e. digital scan converter Spectral broadening suggest: a. laminar flow b. turbulent flow c. flow away from the transducer d. flow towards the transducer ...

Pericardium - ANSWER a fluid filled sac that covers the heart and helps protect it against infection and trauma. fibrous pericardium - ANSWER The outermost layer of the pericardium serous pericardium - ANSWER The innermost layer of the pericardium, it is made up of two layers parietal layer - ANSWER first layer of the serous pericardium that lines the inside of the fibrous pericardium Visceral layer - ANSWER the layer that adheres to the outside of the heart. ...

Where is the CS located - ANSWER posterior to the AV groove Scatters= - ANSWER RBC Most common congenital anomaly most frequently seen in adults - ANSWER Bi cuspid valve In order to record a vegetation of endocarditis by echo the veg must have a diameter of at least how big - ANSWER 3 centemeter Which M mode finding is considered to be a specific indicator of a fenestrated AV - ANSWER diastolic flutter of the aortic valve Fenestrated= - ANSWER window like op...