CHM191 The Bunsen burner regulator can be adjusted to produce a ---------- flame. *Non-luminous* Electric oven can also be referred to as -------- oven. *Drying* If corrosive fumes may evolve during evaporation, the process must be carried out in a ---------------. *Fume hood* The most conventional size for volumetric work is the 250ml ------------------- *Conical flask* Liquid reagent should be taken with the help of -----------------. *Droppers* The --------------- is the basic unit for the quantity of a substance. *Mole* The three different techniques in titrimetric analysis are direct, indirect and ---------- titration. *Back* Aluminium is --------------- reactive than calcium. *Less* A substance that lose electron is said to be ---------------- *Oxidized* The more ----------------- the potential, the easier the oxidation will be. *Positive* Heat of -------------- is the amount of heat released or absorbed for a given amount of reactant or products. *Reaction* The -------------- is used to measure the heat of reaction. *Calorimeter* -------------- are volumetric analysis involving iodine. *Iodimetry* KMnO4 is characteristically -------------- in both acid and base media. *Coloured* In --------------- reactions , oxidation and reduction occurs simultaneously *Redox* The two balanced ---------------- equations should add up to give redox equations. *Half* Phenolphthalein can be used in the titration of HCl and NaOH since the titration is between -------------- acid and strong base. strong When standard solution directly reacts with the substance being determined, the titration is said to be ------------------- titration. *Direct* Each types of titrimetric analysis is based on certain types of ------------. *Reaction* Titration results are best recorded in ----------- decimal places. *Two* --------------------- of a substance is achieved by titrating the approximate concentration with standard solution of known concentration. *Standardization* Is it practically possible to prepare a solution of high concentration from a solution of lower concentration? *NO* A solution contains 2.65g of anhydrous sodium carbonate in 125ml of solution, what is its concentration in mole per dm cube? *0.2* A standard solution is prepared by weighing a ------- solute and dissolving it in a suitable solvent. *Pure* The equivalent weight of solute per volume of solution in dm3 is termed ---------- *Normality* Sometimes precipitates are heated to a high temperature to convert it into a ----------- of constant composition. *Compound* Ash less filter paper leaves little residue on -----------. *Ignition* For laboratory purpose, filter papers of ---------------- grades are generally made. *Three* Proper ----------------- of filter paper can increase the rate of filteration. *Folding* An antidote should be given only to a person that swallow ---------- poisons. *Non-corrosive* When you are very careful and follow all the laboratory rules of safety ,all accidents in the laboratory will be avoided. True or False *False* A ------- notebook should be used for laboratory record. *Bound* Ordinary filtration can be speeded up by the use of ------------------------ filtration. *Suction* Care must be taken so that the liquid does not --------------- violently while evaporating in a boiling tube. *Bump* Conical flask is the container in which the ----------- meet and the products is/are formed. *Reactants* One of the following causes mental confusion CHCl3 Which of the following is most dangerous to the skin? HF Bunsen burner can be adjusted to a moderately high temperature of about _________. 600 oC Which of these operations is performed in wet chemical analysis? Precipitation The number of moles of solute in one kilogram of solution is called __________ Molality All pure substance have the following characteristics except ___________. Readily soluble in water There are ______ types of titrimetric analysis. Four Which indicator is suitable for the titration of ethanoic acid and ammonia. None Which of the following metals has the least oxidation potential? Ag A reaction involving iron and copper ions, which of the ions will be oxidized? Fe The reaction is ______ when the reaction vessel feels warmer. exothermic The amount of heat required to raise the temperature of one mole of substances through one degree Celsius is called _______. Molar heat capacity Displacement reactions are usually ______. oxidized The most commonly used external indicator for iodine titration is ____________. starch It is very difficult to read the meniscus of potassium permanganate solution in burette because ___________. Of its intense colouration Which of these acid is suitable to catalyze permanganate reaction? Sulphuric acid Oxidation is defined as the ___________ Loss of electron Given the equation, C + H2SO4 → CO2 + SO2 + H2O, the oxidation number of sulphur decrease by ____. 2 The oxidation number of sulphur in H2SO42- is ___________. 4 H2O2 is oxidized by MnO2 to give _______. O2 Volumetric method of analysis measures ______. Volume of a gas or volume of solution of unknown concentration The concept of ________ method is used in the preparation of a solution of lower concentration from higher concentration Dilution Which of the following is true of molar and molal concentration of sodium carbonate? Molal concentration is higher Precipitation is common to ________ analysis. Gravimetric What should be given to a person that swallowed corrosive poison as soon as possible? Calcium hydroxide solution Burns caused by bromine can be treated with _______ Ammonia Burns are mostly caused by ______. Hot equipment and reagents What is the molar concentration of a solution containing 2.5g of potassium hydroxide in 200cm3 of solution. (K = 39, H=1,O=16) 0.22mol/dm3 In a titration, 25cm3of an impure anhydrous sodium trioxocarbonate (iv) containing 5.0g in 1dm3 of solution was neutralized by 22.20cm3of 0.10mol/dm3 of HCl, find the mass concentration of the trioxocarbonate (iv). 4.71g/dm3 A molar solution of caustic soda is prepared by dissolving ____________. 40g NaOH in 1000g of water What volume of 0.5M sulphuric acid will exactly neutralize 20cm3 of 0.1M NaOH solution? 2.0 cm3 In which type of titration is two standard solution needed? Back The volume of acid used is usually ______ Average titre value All electron donors are normally _____. Reducing agent At what reaction condition will the absolute value of enthalpy equals the absolute value of heat of reaction? Constant pressure