OCR Gateway Science
... (a) Write down the titres for runs 1 to 5 (b) Suggest why the first run was so much higher than the others. (c) Calculate the average titre using the results for titres 2 to 5. (d) Explain why you would not use universal indicator for this titration. (e) Phenolphthalein indicator was used to find th ...
... (a) Write down the titres for runs 1 to 5 (b) Suggest why the first run was so much higher than the others. (c) Calculate the average titre using the results for titres 2 to 5. (d) Explain why you would not use universal indicator for this titration. (e) Phenolphthalein indicator was used to find th ...
Unit 7 Homework and Lab Packet
... 3. Add 50.0 ml of distilled water to the beaker. Swirl the beaker around to dissolve all of the copper(II)sulfate crystals. 4. Obtain two clean, dry iron nails from your teacher. If the nails are not clean, use a piece of sand paper or steel wool to make the surface of the nail shiny. Find the mass ...
... 3. Add 50.0 ml of distilled water to the beaker. Swirl the beaker around to dissolve all of the copper(II)sulfate crystals. 4. Obtain two clean, dry iron nails from your teacher. If the nails are not clean, use a piece of sand paper or steel wool to make the surface of the nail shiny. Find the mass ...
08_chapter 3
... drops of water was left in the test tube containing sterilized washed nodule.The nodules were crushed with a sterilized glass rod with flat end to form a turbid suspension under aseptic conditions. A loopful of the suspension was streaked on yeast extract mannitol agar medium (Fred et al,.1932). The ...
... drops of water was left in the test tube containing sterilized washed nodule.The nodules were crushed with a sterilized glass rod with flat end to form a turbid suspension under aseptic conditions. A loopful of the suspension was streaked on yeast extract mannitol agar medium (Fred et al,.1932). The ...
C:\SUBJECTS\SUBJECTS\Chemistry
... E. Ion (T), copper (L), aluminium (TL). In the preparation of some pure crystals of Cu (NO3)2 starting with CuO, a student gave the following statements as steps he employed. Which of these shows a flaw in his report? A. Some CuO was reacted with excess dilute H2SO4 B. The solution was concentrated ...
... E. Ion (T), copper (L), aluminium (TL). In the preparation of some pure crystals of Cu (NO3)2 starting with CuO, a student gave the following statements as steps he employed. Which of these shows a flaw in his report? A. Some CuO was reacted with excess dilute H2SO4 B. The solution was concentrated ...
Chemistry JAMB Past Questions
... more heat is absorbed heat is evolved in (1) more heat is absorbed in (11) less heat is evolved in (1) reaction (11) proceeds faster than (1) reaction (1) proceeds faster than (11) Which of these metals, Mg, Fe, Pb, and Cu will dissolve in dilute HCI? All the metals Mgm Fe, and Cu Mg, Fem and Pb Mg ...
... more heat is absorbed heat is evolved in (1) more heat is absorbed in (11) less heat is evolved in (1) reaction (11) proceeds faster than (1) reaction (1) proceeds faster than (11) Which of these metals, Mg, Fe, Pb, and Cu will dissolve in dilute HCI? All the metals Mgm Fe, and Cu Mg, Fem and Pb Mg ...
L A B O
... After you’ve read through the experiment, try to answer the review questions we’ve included at the end of each experiment. These questions will help you to understand the experiment in advance. Some of your experiments will also contain an element of danger. For this and other reasons, your lab inst ...
... After you’ve read through the experiment, try to answer the review questions we’ve included at the end of each experiment. These questions will help you to understand the experiment in advance. Some of your experiments will also contain an element of danger. For this and other reasons, your lab inst ...
Acids ,Bases and Salts
... This dissociation/ionization makes aqueous ammonia to: (i)turn litmus paper/solution blue. (ii)have pH 8/9/10/11 (iii)be a good electrical conductor (iv)react with acids to form ammonium salt and water only. NH4OH(aq) + HCl(aq) -> NH4Cl(aq) + H2O(l) (d)Ammonia gas dissolves in methylbenzene/benzene ...
... This dissociation/ionization makes aqueous ammonia to: (i)turn litmus paper/solution blue. (ii)have pH 8/9/10/11 (iii)be a good electrical conductor (iv)react with acids to form ammonium salt and water only. NH4OH(aq) + HCl(aq) -> NH4Cl(aq) + H2O(l) (d)Ammonia gas dissolves in methylbenzene/benzene ...
Chlorine
... chlorine gas does, how ever, support combustion of organic compounds such as hydrocarbons, although the carbon component tends to burn incompletely, with much of it remaining as soot . At 10 °C and atmospheric pressure, one liter of water dissolves 3.10 L of gaseous chlorine, and at 30 °C, 1 L of wa ...
... chlorine gas does, how ever, support combustion of organic compounds such as hydrocarbons, although the carbon component tends to burn incompletely, with much of it remaining as soot . At 10 °C and atmospheric pressure, one liter of water dissolves 3.10 L of gaseous chlorine, and at 30 °C, 1 L of wa ...
Module 2. Drug substances of aromatic structure
... E. *Bismuth tribromophenol basic with bismuth oxide 82. For synthesis of thymol it is possible to use such initial substance: A. Phenylsalicylate B. Phthalic acid C. Benzol D. Phenol E. *3-Metylphenol (m-cresol) 83. For assay of resorcinol, according to Pharmacopoeia, use method: A. Cerymetry, direc ...
... E. *Bismuth tribromophenol basic with bismuth oxide 82. For synthesis of thymol it is possible to use such initial substance: A. Phenylsalicylate B. Phthalic acid C. Benzol D. Phenol E. *3-Metylphenol (m-cresol) 83. For assay of resorcinol, according to Pharmacopoeia, use method: A. Cerymetry, direc ...
Dr David`s Chemistry Test Answers
... 2. Many familiar inorganic reactions like the reaction of hydrochloric acid with sodium hydroxide are not reversible. Similarly, the reaction of silver nitrate solution with sodium chloride solution is a reaction which only goes one way (ie, left to right). This produces a white precipitate of silve ...
... 2. Many familiar inorganic reactions like the reaction of hydrochloric acid with sodium hydroxide are not reversible. Similarly, the reaction of silver nitrate solution with sodium chloride solution is a reaction which only goes one way (ie, left to right). This produces a white precipitate of silve ...
answer ch6 - Mr Khaled Nasr
... 3.23X1023 molecules of nitrogen gas occupy 5 liters at STP. 15 grams of chlorine gas occupies 2 liters at STP (Cl = 35.5 ) The molar mass of a gas at STP whose density is 1.96 grams/liter is 20 grams. Density of a gas at STP depends on the molar volume only. The density of O2 gas is EQUAL TO that of ...
... 3.23X1023 molecules of nitrogen gas occupy 5 liters at STP. 15 grams of chlorine gas occupies 2 liters at STP (Cl = 35.5 ) The molar mass of a gas at STP whose density is 1.96 grams/liter is 20 grams. Density of a gas at STP depends on the molar volume only. The density of O2 gas is EQUAL TO that of ...
Examination - SCSA - School Curriculum and Standards Authority
... The following 1.00 mol L–1 solutions are diluted by the addition of water. In which solution will the pH not change but the electrical conductivity will decrease? (a) (b) (c) (d) ...
... The following 1.00 mol L–1 solutions are diluted by the addition of water. In which solution will the pH not change but the electrical conductivity will decrease? (a) (b) (c) (d) ...
Lab Manual Yr 1 organic
... existence of elements other than carbon, hydrogen and oxygen. Elements such as nitrogen, sulphur, iodine, chlorine and bromine in organic compounds can easily be detected by means of straightforward chemical tests. J.L. Lassaigne has developed a method used for the quantitative determination of elem ...
... existence of elements other than carbon, hydrogen and oxygen. Elements such as nitrogen, sulphur, iodine, chlorine and bromine in organic compounds can easily be detected by means of straightforward chemical tests. J.L. Lassaigne has developed a method used for the quantitative determination of elem ...
2014_S4_CHM_NORMAL (ALL)
... 53. Element X (atomic number 11) reacts with element Y (atomic number 16) to form an ionic compound. Each atom of X loses one electron and each atom of Y accepts two electrons to form a compound with formula X2Y. 54. Consider the following information: ...
... 53. Element X (atomic number 11) reacts with element Y (atomic number 16) to form an ionic compound. Each atom of X loses one electron and each atom of Y accepts two electrons to form a compound with formula X2Y. 54. Consider the following information: ...
Fermentation acids inhibit amino acid deamination by
... 160 mg protein ml21, pH 6?7) were harvested by centrifugation (2300 g, 5 min) in anaerobic culture tubes with rubber stoppers (Bellco Glass). The supernatants were removed by aspiration and the N2 atmosphere was maintained by continuous gassing. Cell pellets were resuspended in basal medium. The sus ...
... 160 mg protein ml21, pH 6?7) were harvested by centrifugation (2300 g, 5 min) in anaerobic culture tubes with rubber stoppers (Bellco Glass). The supernatants were removed by aspiration and the N2 atmosphere was maintained by continuous gassing. Cell pellets were resuspended in basal medium. The sus ...
Chapter 1 questions
... Analysis by mass has indicated the following percentage composition by mass of certain compounds. Calculate the empirical formula of each: a) carbon 75.0%, hydrogen 25.0% b) magnesium 60.3%, oxygen 39.7% c) iron 69.9%, oxygen 30.1% d) potassium 24.7%, manganese 34.8%, oxygen 40.5% e) tin 52.8%, iron ...
... Analysis by mass has indicated the following percentage composition by mass of certain compounds. Calculate the empirical formula of each: a) carbon 75.0%, hydrogen 25.0% b) magnesium 60.3%, oxygen 39.7% c) iron 69.9%, oxygen 30.1% d) potassium 24.7%, manganese 34.8%, oxygen 40.5% e) tin 52.8%, iron ...
Chapter 8 Neonatal Intensive Care Unit
... predominantly associated with gram negative organisms, and within the NICU, three particular sites were recognized as sources of nosocomial associated pathogens. These comprised of infant incubators and cribs, resuscitation equipment and the various cleaning solutions in use in the facility (Srivast ...
... predominantly associated with gram negative organisms, and within the NICU, three particular sites were recognized as sources of nosocomial associated pathogens. These comprised of infant incubators and cribs, resuscitation equipment and the various cleaning solutions in use in the facility (Srivast ...
Chlorine Bleach on Microbial Resistance
... Most strains are non-pathogenic Serve as a common prokaryotic cell model ...
... Most strains are non-pathogenic Serve as a common prokaryotic cell model ...
1aUnit Two Handouts - Dunmore High School
... DECISION TREE: Should a formula be written as ions? Is the substance an acid (formula begins with H), a base (contains hydroxide ion), a salt (cation anion) or other? If it is an acid, go to A. If it is a base, go to B. If it is a salt, go to S. If it is an other, do not write it as ions. Example: Z ...
... DECISION TREE: Should a formula be written as ions? Is the substance an acid (formula begins with H), a base (contains hydroxide ion), a salt (cation anion) or other? If it is an acid, go to A. If it is a base, go to B. If it is a salt, go to S. If it is an other, do not write it as ions. Example: Z ...
Mathematical Operations
... The natural antilog of a number is e raised to a power equal to that number. If your calculator can calculate natural logs, it will also be able to calculate natural antilogs. On some calculators there is a key labeled ~ that allows you to calculate natural antilogs directly; on others, it will be n ...
... The natural antilog of a number is e raised to a power equal to that number. If your calculator can calculate natural logs, it will also be able to calculate natural antilogs. On some calculators there is a key labeled ~ that allows you to calculate natural antilogs directly; on others, it will be n ...
CHM 1033 Chemistry for Health Sciences
... 17. Determine the mass (in grams) of 1.0 liter alcohol, if the density is 0.79 g/ml. What is the specific gravity of the alcohol? 18. An engine part weights 0.82 lb. When measured in a graduated cylinder containing water it displaces a volume of 125.5 ml of water. What is the density of this materia ...
... 17. Determine the mass (in grams) of 1.0 liter alcohol, if the density is 0.79 g/ml. What is the specific gravity of the alcohol? 18. An engine part weights 0.82 lb. When measured in a graduated cylinder containing water it displaces a volume of 125.5 ml of water. What is the density of this materia ...
Experimental skills and abilities
... During the experiment the solution filtered steadily. White cubic crystals of sodium chloride were produced on slow crystallisation. ...
... During the experiment the solution filtered steadily. White cubic crystals of sodium chloride were produced on slow crystallisation. ...
Chemistry Tests Questions
... 14. What important property increases as the vertical arrangement of the noble (inert) gases is descended? 15. What is the family name of the group I elements? 16. Are the group one elements soft or hard? 17. How can you prevent the corrosion of sodium? 18. Which of the group I elements reacts most ...
... 14. What important property increases as the vertical arrangement of the noble (inert) gases is descended? 15. What is the family name of the group I elements? 16. Are the group one elements soft or hard? 17. How can you prevent the corrosion of sodium? 18. Which of the group I elements reacts most ...
National 5 - Deans Community High School
... (a) What volume of gas was produced in Experiment 1 during the first 90 s? (b) In the initial stages, the reaction in Experiment 2 was slower than in Experiment 1. (i) How can this be concluded from the graph? (ii) Suggest two changes in conditions which could have resulted in the slower reaction. ( ...
... (a) What volume of gas was produced in Experiment 1 during the first 90 s? (b) In the initial stages, the reaction in Experiment 2 was slower than in Experiment 1. (i) How can this be concluded from the graph? (ii) Suggest two changes in conditions which could have resulted in the slower reaction. ( ...
Sodium hypochlorite
Sodium hypochlorite is a chemical compound with the formula NaClO. It is composed of a sodium cation (Na+) and a hypochlorite anion (ClO−); it may also be viewed as the sodium salt of hypochlorous acid. When dissolved in water it is commonly known as bleach, or liquid bleach. Sodium hypochlorite is practically and chemically distinct from chlorine. Sodium hypochlorite is frequently used as a disinfectant or a bleaching agent.