teachealogist working in a health come year old make patient for liver function manual colorimeter clinical chemistry analyset in Which part of the instrument emabled an absorbance realing at range of warelengthe? (A) Filtur (B) Cuvet (D) Monochromation 17. A laboratory technology student came to a diagnoene liberatory for peactical attachment The student asked the technologist have the hinds formed one electrophoresis molium What was the most possible explanation of the technologis? (A) The band is formed based upon size to volume ratio (B) The band is formed based upon volume to mass ratio (C) The band is formed hased upon charge to mass ratio (D) The hand is formed based upon volume to charge natio 38. A laboratory technologist working at a research laboratory wants to reparate is protein mixture using ion exchange chromate goaphic technique Therefore, he wants to adiunt this ino-electric point of the protein of interest to that it will be cluted out finit and with expected amount What solution should be used to partition the protems acconding to their iso-cleane point? (A) Buffer solution (C) Aculic solution (B) Sample solution (D) Alkalino solution 39. A laboratory technologist performs Zieh Neelsen staining for the diagnost ul Mycoliac erium leprac. The technologist performs all the stains correctly except adding the counter stain. What will the technologist likely observe during the examination of this staining? (A) Red rod shaped bacteria with green background (B) Green rod shaped bacteria with red background (C) Red rod shaped bacteria with colorless background (D) Green rod shaped bacteria with colorless background 40. A laboratory technologist performs gram staining from 1 wound swah The technologist stains the fixed microscopic stide correctly until addition of lugol?iodine. What is the next staining reagent to be used after washing it out? (A) Acetone -alcohol (C) Crystal violet (B) Carbolfuchain (D) Safranin

34 The solubility of KI is 50g in 100g of H_(2)O at 20°C . If 110 grams of KI are added to 200 grams of H_(2)O at the same temperature, A. all of the KI will dissolve. C. the solution will be super saturated. D. asaturated solution will form.

Organic chemistry is an area 1 point of study on matter that does not deal with hydrocarbons and their derivatives. True Flase

AQA GCSE Chemistry for Combined Sciences: Trilogy Oxford University Press Help C2 The periodic table Summary questions 1 a Where in the periodic table do you find: I the halogens + II the noble gases [1 mark] iii the alkali metals [1 mark] [1 mark] b In which groups would you find the three elements described below? I This is a metal that can be cut with a knife and is stored under oil. It reacts violently with water and forms ions with a 1+ charge. [I mark] It This is a very unreactive, monatomic gas. (f mark] iii This toxic gas is the most reactive of the all the non-metallic elements. It forms ions with a 1- charge and will also form covalent compounds. [t mark] 2 Astatine, At, is a halogen whose atomic number is 85. It lies at the bottom of Group 7, beneath lodine a How many electrons occupy its outermost shell (highest energy level)? Explain how you worked out your answer. [I mark] b Predict the state of astatine at 20°C [1 mark] c For the compound sodium astatide, predict: I its type of bonding [1 mark] ii its colour [1 mark] iii its chemical formula [1 mark] iv the word equation and the balanced symbol equation for its formation from its elements [2 marks] v whether or not you would see signs of a reaction if a solution of sodium astatide was mixed with chlorine water. Explain how you arrived at your answer. [2 marks] d Place the halogens, including astatine, in order of reactivity, with the most reactive element first. Explain your answer in detail (include the trend in reactivity and the how the trend can be explained, referring to the formation of halide ions). [6 marks] 3 Rubidium, Rb, is in Group 1 of the periodic table, lying directly beneath potassium. a Predict the following physical properties of rubidium, including its hardness, electrical conductivity, and melting point. [3 marks] b i What will be the charge on a rubidium ion? [1 mark] in Copy and complete the table below: Rubidium compound Chemical formula rubidum iodide rubidum fluoride rubidium lydroside Rubidium compound Chemical formula rubidum iodide rubidum fluoride rubidium lydroside [3 marks] c. Write down word equations and balanced symbol equations, including state symbols, for the following reactions: I rubidium and water [3 marks] it rubidium and chlorine. [2 marks] d Will the reactions of rubidium in part c be more or less vigorous than the same reactions using potassium? Explain your answer in detail by comparing the atoms of the two elements. [5 marks] 4 Group 0 is found as the last column in the periodic table, on the extreme right hand side. a Write the name and symbol of the first four elements in Group 0. [2 marks] b What is the name commonly given to the elements in Group 0? [t mark] c Explain which of the first four noble gases is the odd one out in terms of the number of electrons in its outermost shell. [3 marks] d Describe how the electronic structures of the Group 0 elements affects their chemistry. [1 mark] The Group 0 elements are found in trace amounts in the air. If air is gradually cooled down to extremely low temperatures, predict which of the first four elements would condense as a liquid first. Give a reason for your answer. [2 mark] 5 a Explain how Dmitri Mendeleev used atomic weights to construct his periodic table. [2 marks] b Explain how the scientific community were influenced to accept his periodic table. [6 marks] c Why, in 1869, could scientists not explain why some pairs of elements in his periodic table appeared to be in the wrong order according to their atomic weights? [3 marks] 6 a Explain how the atoms of metals and non-metals change when they react to form their ions, using magnesium as an example of a metallic element and oxygen as an example of a non-metallic element. [6 marks] b Suggest how the radius of a metal ion compares with the radius of the metal atom it was made from. Give a reason for your suggestion. [2 marks] 32

Given that the molar mass of NaCl is 58.44g//mol , what is the molarity of a solution that contains 87.75g of NaCl in 500.mL of solution? Use molarity =(" moles of solute ")/(" liters of solution ") . 0.333M 0.751M 1.50M 3.00M

Which of the following is a set of reducing agents? (A) HNO_(3),Fe^(2+),F_(2) (B) F,Cl^(-).MnO_(4)^(-) (C) I^(-),Na,Fe^(2+) (D) CrO_(7)^(2-)*CrO_(4)^(2-),Na . Which of the following is a redox reaction ? (A) 2CuSO_(4)+4KIlongrightarrowCu_(2)I_(2)+2K_(2)SO_(4)+I_(2) (B) SO_(2)+H_(2)OlongrightarrowH_(2)SO_(3) (C) Na_(2)SO_(4)+BaCl_(2)longrightarrowBaSO_(4)+2NaCl (D) CuSO_(4)+4NH_(3)longrightarrow[Cu(NH_(3))_(4)]SO_(4) (E) C_(12)H_(22)O_(I1)+H_(2)OlongrightarrowC_(6)H_(12)O_(6)+C_(6)H_(12)O_(6) Oxidation number of iodine in IO_(3)^(-),IO_(4)^(-),KI and I_(2) respectively are (A) -1,-1,0,+1 (B) +3,+5,+7,0 (C) +5,+7,-1,0 (D) -1,-5,-1,0 (E) -2,-5,-1,0 .

Question Calcium CARBONATE is the chemical name for... quicklime slaked lime limewater limestone

QUESTION THREE (20 MARKS) a) What do you understand by the term Gibbs free energy? Explain the physical meaning when its value is either negative or positive (3 Marks) b) What is an Ellingham diagram? What is it use in studying properties of materials (4 Marks) c) Discuss the processes involved in the thermal degradation of organic matter at atmospheric pressure (13 Marks) QUESTION FOUR (20 MARKS) a) What are the major highlights of the following types of diffusion i. Steady-state diffusion (5 Marks) ii. Non-steady-state diffusion (5 Marks) b) Explain the various factors that influence diffusion in materials (10 Marks) QUESTION FIVE (20 MARKS) a) Write short notes on: i) Reaction sintering ii) Solid Phase sintering (10 Marks) b) Discus at least ten major harmful effects of corrosion? (10 Marks)

Show Question 89 of 90 68 vv77 True or false? The elements in group 1 of the periodic table do not react with non-metals. FALSE TRUE

Ammonia is made up of hydrogen and nitrogen atoms. The ratio of hydrogen to nitrogen atoms in ammonia is 3:1 . What fraction of the atoms in ammonia are nitrogen atoms?

Sparx Maths 3A= 87 3C 30 3E Summary Booknork codar 32 alvanid A chemical solution contains 7.6ml of water. A chemist adds more water to the solution at a rate of 0.03ml//s . How many seconds will it take for the solution to contain 10ml of water? If your answer is a decimal, give it to 2 d.p. Previous: Watch yidea Antuner