CBSE (Mains)
... (1) Small animals like rats will die after drinking river water (2) The increased microbial activity releases micro-nutrients such as iron (3) The increased microbial activity uses up dissolved oxygen (4) The river water is still suitable for drinking as impurities are only about 0.1% Sol: Ans [3] ...
... (1) Small animals like rats will die after drinking river water (2) The increased microbial activity releases micro-nutrients such as iron (3) The increased microbial activity uses up dissolved oxygen (4) The river water is still suitable for drinking as impurities are only about 0.1% Sol: Ans [3] ...
Lab Manual (Eng. Medium)
... top (zero) calibration mark and then drained into a separate container until the calibration mark for the desired volume is reached. The remaining liquid is either discarded or returned to its original container. The maximum indicated capacity of some graduated pipettes is delivered by draining to a ...
... top (zero) calibration mark and then drained into a separate container until the calibration mark for the desired volume is reached. The remaining liquid is either discarded or returned to its original container. The maximum indicated capacity of some graduated pipettes is delivered by draining to a ...
COMPETITION PTOBLEMS 1
... This publication contains the competition problems from the first twenty International Chemistry Olympiads (ICHO) organized in the years 1968 – 1988. It has been published by the ICHO International Information Centre in Bratislava (Slovakia) on the occasion of the 40th anniversary of this internatio ...
... This publication contains the competition problems from the first twenty International Chemistry Olympiads (ICHO) organized in the years 1968 – 1988. It has been published by the ICHO International Information Centre in Bratislava (Slovakia) on the occasion of the 40th anniversary of this internatio ...
Stoichiometry: Calculations with Chemical Formulas and Equations
... 1) Convert to moles 2) Compare – pick 1 reactant, solve for the amount needed of the other and compare. 1.00 mol CO2 2 mol NaOH = 2.00 mol NaOH required (given = 1.70 mol) 1 mol CO2 or 1.70 mol NaOH 1 mol CO2 = 0.85 mol CO2 required 2 mol NaOH (given = 1.00 mol) So: NaOH is the limiting reactant Sto ...
... 1) Convert to moles 2) Compare – pick 1 reactant, solve for the amount needed of the other and compare. 1.00 mol CO2 2 mol NaOH = 2.00 mol NaOH required (given = 1.70 mol) 1 mol CO2 or 1.70 mol NaOH 1 mol CO2 = 0.85 mol CO2 required 2 mol NaOH (given = 1.00 mol) So: NaOH is the limiting reactant Sto ...
Organic Chemistry with a Biological Emphasis Volume I
... the brain - 'it's hot, stay away!' This strategy works quite well on all mammalian species except one: we humans (some of us, at least) appear to be alone in our tendency to actually seek out the burn of the hot pepper in our food. Interestingly, birds also have a heat receptor protein which is very ...
... the brain - 'it's hot, stay away!' This strategy works quite well on all mammalian species except one: we humans (some of us, at least) appear to be alone in our tendency to actually seek out the burn of the hot pepper in our food. Interestingly, birds also have a heat receptor protein which is very ...
Chapter 1 Introduction: Matter and Measurement
... Subatomic Particles • Protons and electrons are the only particles that have a charge. • Protons and neutrons have essentially the same mass. • The mass of an electron is so small we ignore it. ...
... Subatomic Particles • Protons and electrons are the only particles that have a charge. • Protons and neutrons have essentially the same mass. • The mass of an electron is so small we ignore it. ...
Quantitative Chemical Analysis
... already peaked. Oil will play a decreasing role as an energy source and should be more valuable as a raw material than as a fuel. There is also strong pressure to minimize the burning of fuels that produce carbon dioxide, which could be altering Earth’s climate. It is my hope that some of you readin ...
... already peaked. Oil will play a decreasing role as an energy source and should be more valuable as a raw material than as a fuel. There is also strong pressure to minimize the burning of fuels that produce carbon dioxide, which could be altering Earth’s climate. It is my hope that some of you readin ...
Influence of Temperature on Electrical
... The equivalent ionic conductivity increases with the charge number and decreases with a larger radius and viscosity. The values in Table 1 deviates slightly from expected values: the smaller Li+ ion conducts less well than the more voluminous NH4+ ion. The difference comes from the fact that a is ...
... The equivalent ionic conductivity increases with the charge number and decreases with a larger radius and viscosity. The values in Table 1 deviates slightly from expected values: the smaller Li+ ion conducts less well than the more voluminous NH4+ ion. The difference comes from the fact that a is ...
The Mole
... we were supposed to isolate caffeine from tea leaves. Most of my caffeine was washed down the drain in a freak accident. Although I should have had 5.0 g of caffeine, I only ended up with 0.040 g of caffeine and a bad grade on the lab. What was my percent yield? ...
... we were supposed to isolate caffeine from tea leaves. Most of my caffeine was washed down the drain in a freak accident. Although I should have had 5.0 g of caffeine, I only ended up with 0.040 g of caffeine and a bad grade on the lab. What was my percent yield? ...
Document
... Isotopes are atoms of an element with differing numbers number of neutrons Isotopes are (almost) undistinguishable in their chemical properties, because these are mostly determined by the electron shell However, isotopes differ in some of their physical properties (mass!) ...
... Isotopes are atoms of an element with differing numbers number of neutrons Isotopes are (almost) undistinguishable in their chemical properties, because these are mostly determined by the electron shell However, isotopes differ in some of their physical properties (mass!) ...
Modern Chemistry
... 3. A certain sample with a mass of 4.00 g is found to have a volume of 7.0 mL. To calculate the density of the sample, a student entered 4.00 7.0 on a calculator. The calculator display shows the answer as 0.571429. a. Is the setup for calculating density correct? b. How many significant figures s ...
... 3. A certain sample with a mass of 4.00 g is found to have a volume of 7.0 mL. To calculate the density of the sample, a student entered 4.00 7.0 on a calculator. The calculator display shows the answer as 0.571429. a. Is the setup for calculating density correct? b. How many significant figures s ...
CHM 423 Coordination Chemistry
... exhibit properties which make them to be useful in living systems (e.g. Haemoglobin, an important biological molecule in transportation of oxygen), medicine (e.g. Cisplatin, used in treatment of cancer) and in industries (e.g. Petroleum Industry where a number of coordination compounds are used as c ...
... exhibit properties which make them to be useful in living systems (e.g. Haemoglobin, an important biological molecule in transportation of oxygen), medicine (e.g. Cisplatin, used in treatment of cancer) and in industries (e.g. Petroleum Industry where a number of coordination compounds are used as c ...
Chemistry MCQS 12 class
... 2. ‘d’ and ‘f’ block elements are called __________. (Heavy metals, Rare elements, Transition elements) 3. The correct formula of pyrosulphuric acid is __________. (H2SO4, H2S2O7, H3S2O5) 4. Aqua regia is mixture of one part of __________ by volume and three parts of __________. ...
... 2. ‘d’ and ‘f’ block elements are called __________. (Heavy metals, Rare elements, Transition elements) 3. The correct formula of pyrosulphuric acid is __________. (H2SO4, H2S2O7, H3S2O5) 4. Aqua regia is mixture of one part of __________ by volume and three parts of __________. ...
AS/A Level Chemistry (A) specimen question papers and mark
... INSTRUCTIONS TO CANDIDATES Write your name, Centre number and candidate number in the spaces provided on the answer booklet. Write all your answers on the separate answer paper provided. If you use more than one sheet of paper, fasten the sheets together. Answer all questions. INFORMATION FOR CANDID ...
... INSTRUCTIONS TO CANDIDATES Write your name, Centre number and candidate number in the spaces provided on the answer booklet. Write all your answers on the separate answer paper provided. If you use more than one sheet of paper, fasten the sheets together. Answer all questions. INFORMATION FOR CANDID ...
Information on measuring ammonia in water
... For coolant monitoring, the plant operator is more concerned with the fast detection of an ammonia leak in the primary circuit via a qualitative ammonia detection in the secondary circuit. The measurement of the exact concentration in the secondary circuit is of minor importance, since the main obje ...
... For coolant monitoring, the plant operator is more concerned with the fast detection of an ammonia leak in the primary circuit via a qualitative ammonia detection in the secondary circuit. The measurement of the exact concentration in the secondary circuit is of minor importance, since the main obje ...
Solutions Manual
... atoms per molecule are used for food wrap films; 60 000 atoms per molecule make milk containers; 80 000 atoms per molecule make bleach containers and 800 000 atoms per molecule can be used in artificial ice rinks. As chain length increases, density, hardness and melting point increase. Branching is ...
... atoms per molecule are used for food wrap films; 60 000 atoms per molecule make milk containers; 80 000 atoms per molecule make bleach containers and 800 000 atoms per molecule can be used in artificial ice rinks. As chain length increases, density, hardness and melting point increase. Branching is ...
Fundamentals
... WE 1.17 Equilibrium constants in terms of concentrations (on p. 61 in Chemistry3) An equimolar mixture of ethanoic acid and ethanol was heated at 373 K. At equilibrium, the concentration of ethanoic acid was found to be 0.820 mol dm–3. Calculate the concentration of ethyl ethanoate in the equilibriu ...
... WE 1.17 Equilibrium constants in terms of concentrations (on p. 61 in Chemistry3) An equimolar mixture of ethanoic acid and ethanol was heated at 373 K. At equilibrium, the concentration of ethanoic acid was found to be 0.820 mol dm–3. Calculate the concentration of ethyl ethanoate in the equilibriu ...
Stoichiometry and the Mole
... printers are needed for all the employees. However, what if a chemist was calculating quantities for a chemical reaction? Interestingly enough, similar calculations can be performed for chemicals as well as laser printers. Outfitting a New Building In filling a new office building with furniture and eq ...
... printers are needed for all the employees. However, what if a chemist was calculating quantities for a chemical reaction? Interestingly enough, similar calculations can be performed for chemicals as well as laser printers. Outfitting a New Building In filling a new office building with furniture and eq ...
sample
... E) None of the above forms remains constant. Ans: D Difficulty: H 7. The most significant contribution to modern science made by alchemists was A) their fundamental work in the transmutation of the elements. B) their widespread acceptance of observation and experimentation. C) their systematic metho ...
... E) None of the above forms remains constant. Ans: D Difficulty: H 7. The most significant contribution to modern science made by alchemists was A) their fundamental work in the transmutation of the elements. B) their widespread acceptance of observation and experimentation. C) their systematic metho ...
Lactose/D-Galactose
... approx. 60 ml water and incubate for 15 min at approx. 70°C; shake from time to time. For clarification, add 5 ml of Carrez-I-solution (3.60 g potassium hexacyanoferrate(II), K4[Fe(CN)6] × 3 H2O/100 ml), 5 ml of Carrez-II-solution (7.20 g of zinc sulfate, ZnSO4 × 7 H2O/100 ml) and 10 ml of NaOH (0.1 ...
... approx. 60 ml water and incubate for 15 min at approx. 70°C; shake from time to time. For clarification, add 5 ml of Carrez-I-solution (3.60 g potassium hexacyanoferrate(II), K4[Fe(CN)6] × 3 H2O/100 ml), 5 ml of Carrez-II-solution (7.20 g of zinc sulfate, ZnSO4 × 7 H2O/100 ml) and 10 ml of NaOH (0.1 ...
Lactose/D-Galactose
... approx. 60 ml water and incubate for 15 min at approx. 70°C; shake from time to time. For clarification, add 5 ml of Carrez-I-solution (3.60 g potassium hexacyanoferrate(II), K4[Fe(CN)6] × 3 H2O/100 ml), 5 ml of Carrez-II-solution (7.20 g of zinc sulfate, ZnSO4 × 7 H2O/100 ml) and 10 ml of NaOH (0.1 ...
... approx. 60 ml water and incubate for 15 min at approx. 70°C; shake from time to time. For clarification, add 5 ml of Carrez-I-solution (3.60 g potassium hexacyanoferrate(II), K4[Fe(CN)6] × 3 H2O/100 ml), 5 ml of Carrez-II-solution (7.20 g of zinc sulfate, ZnSO4 × 7 H2O/100 ml) and 10 ml of NaOH (0.1 ...
The Mole Concept A. Atomic Masses and Avogadro`s Hypothesis 1
... Dalton assumed that elements formed simple compounds in a 1:1 ratio and he assigned an ARBITRARY MASS to each element. Since hydrogen was the lightest element, it was assigned a mass of “1” and all other elements were compared to that of hydrogen. Carbon was found to be 6 times heavier than hydrogen ...
... Dalton assumed that elements formed simple compounds in a 1:1 ratio and he assigned an ARBITRARY MASS to each element. Since hydrogen was the lightest element, it was assigned a mass of “1” and all other elements were compared to that of hydrogen. Carbon was found to be 6 times heavier than hydrogen ...
quantitative chemistry
... these more basic components. The interpretation on a sub-microscopic scale is that all substances are made up of very tiny particles called atoms. Atoms are the smallest particles present in an element which can take part in a chemical change and they cannot be split by ordinary chemical means. An e ...
... these more basic components. The interpretation on a sub-microscopic scale is that all substances are made up of very tiny particles called atoms. Atoms are the smallest particles present in an element which can take part in a chemical change and they cannot be split by ordinary chemical means. An e ...
Analytical chemistry
Analytical chemistry is the study of the separation, identification, and quantification of the chemical components of natural and artificial materials. Qualitative analysis gives an indication of the identity of the chemical species in the sample, and quantitative analysis determines the amount of certain components in the substance. The separation of components is often performed prior to analysis.Analytical methods can be separated into classical and instrumental. Classical methods (also known as wet chemistry methods) use separations such as precipitation, extraction, and distillation and qualitative analysis by color, odor, or melting point. Classical quantitative analysis is achieved by measurement of weight or volume. Instrumental methods use an apparatus to measure physical quantities of the analyte such as light absorption, fluorescence, or conductivity. The separation of materials is accomplished using chromatography, electrophoresis or field flow fractionation methods.Analytical chemistry is also focused on improvements in experimental design, chemometrics, and the creation of new measurement tools to provide better chemical information. Analytical chemistry has applications in forensics, bioanalysis, clinical analysis, environmental analysis, and materials analysis.