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... disease. Such as methemoglobinemia. SO42- : above 500 ppm of SO42- ion in drinking water causes laxative effect otherwise at moderate levels it is harmless F– : Above 2ppm concentration of F– in drinking water cause brown mottling of teeth. ∴ The concentration given in question of SO42- & NO3- in wa ...
... disease. Such as methemoglobinemia. SO42- : above 500 ppm of SO42- ion in drinking water causes laxative effect otherwise at moderate levels it is harmless F– : Above 2ppm concentration of F– in drinking water cause brown mottling of teeth. ∴ The concentration given in question of SO42- & NO3- in wa ...
Electrochemistry
... The oxidation reaction occurs at the anode. The reduction reaction occurs at the cathode. You will be give the unbalanced net ionic reaction or a list of the substances present (line notation). From the information given you need to decide what half reactions occur in each beaker. Draw each beaker w ...
... The oxidation reaction occurs at the anode. The reduction reaction occurs at the cathode. You will be give the unbalanced net ionic reaction or a list of the substances present (line notation). From the information given you need to decide what half reactions occur in each beaker. Draw each beaker w ...
![[SESSION-2014-2015] SUBJECT - SCIENCE PATNA REGION](http://s1.studyres.com/store/data/008930072_1-5a35e1ae8e3204ea88999f1418a93013-300x300.png)
[SESSION-2014-2015] SUBJECT - SCIENCE PATNA REGION
... For water or neutral solutions, pH = 7 ; For acidic solutions, pH < 7; For basic solutions, pH > 7 8) Some Important Chemical Compounds: a)Common Salt (NaCl) Sodium chloride is known as common salt. Its main source is sea water. It is also exists in the form of rocks and is called rock salt. Common ...
... For water or neutral solutions, pH = 7 ; For acidic solutions, pH < 7; For basic solutions, pH > 7 8) Some Important Chemical Compounds: a)Common Salt (NaCl) Sodium chloride is known as common salt. Its main source is sea water. It is also exists in the form of rocks and is called rock salt. Common ...
std 6 review12ans
... Standard 6a: Students know the definitions of solute and solvent. Match the following: 1. The chemical that is doing the dissolving (there is more of it) in the solution. b ...
... Standard 6a: Students know the definitions of solute and solvent. Match the following: 1. The chemical that is doing the dissolving (there is more of it) in the solution. b ...
Chemistry
... 11. _____(T/F) A one molar solution of sodium fluoride (NaF) would lower the vapor pressure of water to the same extent that a one molar solution of magnesium chloride (MgCl2). 12. _____(T/F) Elevation of the vapor pressure due to the increase in the number of nonvolatile solute particles will not a ...
... 11. _____(T/F) A one molar solution of sodium fluoride (NaF) would lower the vapor pressure of water to the same extent that a one molar solution of magnesium chloride (MgCl2). 12. _____(T/F) Elevation of the vapor pressure due to the increase in the number of nonvolatile solute particles will not a ...
Thermochemistry and calorimetry
... decomposition is essentially zero, so it is still possible for the substance to exist. In this connection, it is worth noting that all molecules will become unstable at higher temperatures. • The thermochemical reactions that define the heats of formation of most compounds cannot actually take place ...
... decomposition is essentially zero, so it is still possible for the substance to exist. In this connection, it is worth noting that all molecules will become unstable at higher temperatures. • The thermochemical reactions that define the heats of formation of most compounds cannot actually take place ...
National 5 Chemistry Unit 3 Chemistry In Society
... The purpose of the ion bridge is to complete the circuit of this cell. The ion bridge (sometimes called a salt bridge) contains an electrolyte which takes no part in the cell reactions. The chemical reactions in cells like these are displacement reactions. Zinc can displace copper from copper(II) su ...
... The purpose of the ion bridge is to complete the circuit of this cell. The ion bridge (sometimes called a salt bridge) contains an electrolyte which takes no part in the cell reactions. The chemical reactions in cells like these are displacement reactions. Zinc can displace copper from copper(II) su ...
Metals Minitest
... The purpose of the ion bridge is to complete the circuit of this cell. The ion bridge (sometimes called a salt bridge) contains an electrolyte which takes no part in the cell reactions. The chemical reactions in cells like these are displacement reactions. Zinc can displace copper from copper(II) su ...
... The purpose of the ion bridge is to complete the circuit of this cell. The ion bridge (sometimes called a salt bridge) contains an electrolyte which takes no part in the cell reactions. The chemical reactions in cells like these are displacement reactions. Zinc can displace copper from copper(II) su ...
Chemistry II Exams and Keys Corrected 2016 Season
... 5. A quantity of 100.0 mL of 1.000 M HBr is mixed with 100.0 mL of 0.500 M Ca(OH)2 in a coffee-cup calorimeter that has a heat capacity of 20.0 J/°C. The initial temperature of the HBr and Ca(OH)2 solutions is the same at 23.5 °C. For the following process the heat of neutralization is 56.0 kJ/mol. ...
... 5. A quantity of 100.0 mL of 1.000 M HBr is mixed with 100.0 mL of 0.500 M Ca(OH)2 in a coffee-cup calorimeter that has a heat capacity of 20.0 J/°C. The initial temperature of the HBr and Ca(OH)2 solutions is the same at 23.5 °C. For the following process the heat of neutralization is 56.0 kJ/mol. ...
Indian National Chemistry Olympiad Theory 2014
... The melting point of cryolite (molar mass 210 g) is 1282.7K. However, by adding sodium fluoride cryolite is made to melt at 1233K. ...
... The melting point of cryolite (molar mass 210 g) is 1282.7K. However, by adding sodium fluoride cryolite is made to melt at 1233K. ...
Exames anteriores a 1994
... (see Fig. 2). The numbers indicated on the maps relate to the electron density in the neighbourhood of the atoms of E as a function of the spatial coordinates. The maxima found in these maps coincide with the locations of the atoms and the values are approximately proportional to the number of elect ...
... (see Fig. 2). The numbers indicated on the maps relate to the electron density in the neighbourhood of the atoms of E as a function of the spatial coordinates. The maxima found in these maps coincide with the locations of the atoms and the values are approximately proportional to the number of elect ...
CST Review Part 2
... mass of a molecular substance to moles, number of particles, of volume of gas at standard temperature and pressure. e. Students know how to calculate the masses of reactants and products in a chemical reaction from the mass of one of the reactants or products and the relevant atomic masses. 8. Write ...
... mass of a molecular substance to moles, number of particles, of volume of gas at standard temperature and pressure. e. Students know how to calculate the masses of reactants and products in a chemical reaction from the mass of one of the reactants or products and the relevant atomic masses. 8. Write ...
Template for calculating the ΔH° in a multiple step chemical reaction
... 19. In your words, explain the Law of Conservation of Energy ...
... 19. In your words, explain the Law of Conservation of Energy ...
Quantum Behavior of Water Molecules Confined to Nanocavities in
... rotation by the angle π/3. When transformed, ψ acquires some extra factor exp{iϕ} with the phase ϕ = mπ/3 (m = 0, ±1, ±2, 3). In other words, all states of molecular motion are characterized by their angular number m and can be interpreted as superpositions of the quantum states corresponding to sma ...
... rotation by the angle π/3. When transformed, ψ acquires some extra factor exp{iϕ} with the phase ϕ = mπ/3 (m = 0, ±1, ±2, 3). In other words, all states of molecular motion are characterized by their angular number m and can be interpreted as superpositions of the quantum states corresponding to sma ...
Topic 1: Quantitative Chemistry
... 1. Calculate the molar mass of a gas if it is found that 15.0g of the gas occupies 3.00 x 104 mL at 581°C and 50.0 kPa. The actual molar mass is found to be different by 10%, account for this. 2. Gas in a 2.0 dm3 box is at a pressure of 100kPa and 200 K temperature. If the gas is heated to 300K, wha ...
... 1. Calculate the molar mass of a gas if it is found that 15.0g of the gas occupies 3.00 x 104 mL at 581°C and 50.0 kPa. The actual molar mass is found to be different by 10%, account for this. 2. Gas in a 2.0 dm3 box is at a pressure of 100kPa and 200 K temperature. If the gas is heated to 300K, wha ...
HYDROGEN BONDING AND OTHER MOLECULAR
... extended to include a great variety of weaker interactions such as are responsible for the low frequency of vibration of the O-H group in single molecules of the acids and in ortho-chlorophenol, and for a part of the heats of vaporization of HCN and HCl? These latter, of course, merge into the group ...
... extended to include a great variety of weaker interactions such as are responsible for the low frequency of vibration of the O-H group in single molecules of the acids and in ortho-chlorophenol, and for a part of the heats of vaporization of HCN and HCl? These latter, of course, merge into the group ...
Unit 1 PowerPoint Complete Notes
... Involve the combining of smaller atoms/molecules into larger, more complex molecules. If only two different atoms appear on the reactant side, then the reaction must be synthesis. General Formula: ...
... Involve the combining of smaller atoms/molecules into larger, more complex molecules. If only two different atoms appear on the reactant side, then the reaction must be synthesis. General Formula: ...
Introduction_to_Chemical_Reactions_2011
... (Cont’d) Decomposition of a compound produces two or more elements and/or compounds The products are always simpler than the reactant. Gases are often produced (H2, N2, O2, CO2, etc.) in the decomposition of covalent compounds. ...
... (Cont’d) Decomposition of a compound produces two or more elements and/or compounds The products are always simpler than the reactant. Gases are often produced (H2, N2, O2, CO2, etc.) in the decomposition of covalent compounds. ...
Fundamentals
... Water is composed of hydrogen and oxygen. Some elements are found as associated atoms, called a molecule. The term "molecule" is often used to refer both to compounds and to elemental molecules. At the heart of the atomistic view of materials is the notion that the fundamental building blocks for ma ...
... Water is composed of hydrogen and oxygen. Some elements are found as associated atoms, called a molecule. The term "molecule" is often used to refer both to compounds and to elemental molecules. At the heart of the atomistic view of materials is the notion that the fundamental building blocks for ma ...
Molarity = moles of solute liters of solution M1V1 = M2V2
... very general. While concentrated indicates that there is a lot of solute dissolved in the solvent (perhaps the solution is near to being saturated) and dilute indicates that a small amount of solute is dissolved in the solvent, we often need to be exact with quantities in chemistry. Molarity (M) exp ...
... very general. While concentrated indicates that there is a lot of solute dissolved in the solvent (perhaps the solution is near to being saturated) and dilute indicates that a small amount of solute is dissolved in the solvent, we often need to be exact with quantities in chemistry. Molarity (M) exp ...
Cambridge International Examinations Cambridge
... Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. A copy of the Periodic Table is printed on page 20. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at th ...
... Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. A copy of the Periodic Table is printed on page 20. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at th ...
Electrolysis of water
Electrolysis of water is the decomposition of water (H2O) into oxygen (O2) and hydrogen gas (H2) due to an electric current being passed through the water.This technique can be used to make hydrogen fuel (hydrogen gas) and breathable oxygen; though currently most industrial methods make hydrogen fuel from natural gas instead.