N5 Chemistry Summary notes 2017
... Everything is made up of tiny particles called atoms. Atoms are mostly empty space made up of smaller sub-atomic particles. At the centre of the atom is the nucleus. This contains two types of particles, called protons and neutrons. Spinning around the nucleus are very fast moving particles called e ...
... Everything is made up of tiny particles called atoms. Atoms are mostly empty space made up of smaller sub-atomic particles. At the centre of the atom is the nucleus. This contains two types of particles, called protons and neutrons. Spinning around the nucleus are very fast moving particles called e ...
Unit5_Chemical Thermodynamics
... energy. This chemical reaction is brought in contact with a water bath, and the transfer of energy from the reaction to the water takes place. Assuming the specific heat capacity of water is 4.184 J/g·K, and that in such an experiment 100% of the energy generated is transferred to the water causing ...
... energy. This chemical reaction is brought in contact with a water bath, and the transfer of energy from the reaction to the water takes place. Assuming the specific heat capacity of water is 4.184 J/g·K, and that in such an experiment 100% of the energy generated is transferred to the water causing ...
17.2 The Avogadro Number
... The large number in front of H2 tells how many molecules of H2 are required for the reaction to proceed. The large number in front of H2O tells how many molecules of water are formed by the reaction. These numbers are called coefficients. Using coefficients, we can balance chemical equations so that ...
... The large number in front of H2 tells how many molecules of H2 are required for the reaction to proceed. The large number in front of H2O tells how many molecules of water are formed by the reaction. These numbers are called coefficients. Using coefficients, we can balance chemical equations so that ...
chapter 1 - Revsworld
... The contribution for which de Broglie is remembered in modern science is a) his statement that an electron can exist in an atom in discrete energy levels. b) his statement that no electron can have identical values for all 4 quantum numbers. c) his statement that electrons occupy all the orbitals of ...
... The contribution for which de Broglie is remembered in modern science is a) his statement that an electron can exist in an atom in discrete energy levels. b) his statement that no electron can have identical values for all 4 quantum numbers. c) his statement that electrons occupy all the orbitals of ...
Chemistry 120
... Moles and solutions When a substance is dissolved in a solvent, we relate the quantity of material dissolved to the volume of the solution through the concentration of the solution. The concentration is simply the number of moles of the material per unit volume: C=n ...
... Moles and solutions When a substance is dissolved in a solvent, we relate the quantity of material dissolved to the volume of the solution through the concentration of the solution. The concentration is simply the number of moles of the material per unit volume: C=n ...
Word - chemmybear.com
... what happens when water is reduced at the cathode. 8. (Trick #2) When CuSO4(aq) is electrolyzed, you know that Cu° metal is going to form because copper's potential is higher than water. So, positive electrode will attract SO42- ions but SO42- can not further oxidize (full of oxygen and no more unsh ...
... what happens when water is reduced at the cathode. 8. (Trick #2) When CuSO4(aq) is electrolyzed, you know that Cu° metal is going to form because copper's potential is higher than water. So, positive electrode will attract SO42- ions but SO42- can not further oxidize (full of oxygen and no more unsh ...
Compulsory textbook Recommended textbooks Topics of the first
... • Weighing is always done by using an analytical balance • The weighed mass must always be larger than 100 mg (to have accuracy better than 1%) • Examples: SO42- ions in the form of BaSO4 ...
... • Weighing is always done by using an analytical balance • The weighed mass must always be larger than 100 mg (to have accuracy better than 1%) • Examples: SO42- ions in the form of BaSO4 ...
Chap15 - Bakersfield College
... • The equilibrium constant, Kc, is the value obtained for the equilibrium-constant expression when equilibrium concentrations are substituted. – A large Kc indicates large concentrations of products at equilibrium. – A small Kc indicates large concentrations of unreacted reactants at equilibrium. ...
... • The equilibrium constant, Kc, is the value obtained for the equilibrium-constant expression when equilibrium concentrations are substituted. – A large Kc indicates large concentrations of products at equilibrium. – A small Kc indicates large concentrations of unreacted reactants at equilibrium. ...
molecular formula
... The atomic mass in grams of any element contains 1 mole of atoms. This is the same number of particles as there are in exactly 12 grams of carbon-12. 1 mole of atoms = 6.0221 x 1023 atoms 1 mole of molecules = 6.0221 x 1023 molecules 1 mole of ions = 6.0221 x 1023 ions 1 mole of formula units = 6.02 ...
... The atomic mass in grams of any element contains 1 mole of atoms. This is the same number of particles as there are in exactly 12 grams of carbon-12. 1 mole of atoms = 6.0221 x 1023 atoms 1 mole of molecules = 6.0221 x 1023 molecules 1 mole of ions = 6.0221 x 1023 ions 1 mole of formula units = 6.02 ...
Chapter 3: Calculations with Chemical Formulas
... another substance. Brønsted Base: Can accept protons (H+) from another substance. (NH3) ...
... another substance. Brønsted Base: Can accept protons (H+) from another substance. (NH3) ...
Mr. Dehne AP Chem Name: ___________ Date: Per#: ___ AP
... water. They were oxidized to convert all of the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. The mass of BaSO4 obtained was 0.5032g. What is the average mass of saccharin per tablet? What is the average mass percent of saccharin in the tablets? 35. A ...
... water. They were oxidized to convert all of the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. The mass of BaSO4 obtained was 0.5032g. What is the average mass of saccharin per tablet? What is the average mass percent of saccharin in the tablets? 35. A ...
FoundationsofChemistryppt
... • The combination of symbols and numbers that represents a compound is called a chemical formula. ...
... • The combination of symbols and numbers that represents a compound is called a chemical formula. ...
O - Free Exam Papers
... So we need 32g of oxygen to react with 12g of carbon and 44g of carbon dioxide is formed in the reaction. © Boardworks Ltd 2001 ...
... So we need 32g of oxygen to react with 12g of carbon and 44g of carbon dioxide is formed in the reaction. © Boardworks Ltd 2001 ...
1 - KFUPM Faculty List
... 10 g I2 mixed with 10 g NaOH, thus a limiting reactant calculation is needed to get the theoretical yield from the limiting reactant. 1. reactant: number of moles of I2: ...
... 10 g I2 mixed with 10 g NaOH, thus a limiting reactant calculation is needed to get the theoretical yield from the limiting reactant. 1. reactant: number of moles of I2: ...
Stoichiometry of Ozonation of Environmentally
... carboxylic acids to form alkoxy-, hydroxy-, and acyloxyhydroperoxides, respectively, and isomerization into carboxylic acids (16). In gas-phase ozonation reactions, carbonyl oxides may also undergo unimolecular decomposition to give OH radicals in fairly high yields (17). It is often assumed that oz ...
... carboxylic acids to form alkoxy-, hydroxy-, and acyloxyhydroperoxides, respectively, and isomerization into carboxylic acids (16). In gas-phase ozonation reactions, carbonyl oxides may also undergo unimolecular decomposition to give OH radicals in fairly high yields (17). It is often assumed that oz ...
2011 Assessment Report Chemistry 2
... 20) eliciting less than 60 per cent correct responses. In Question 5 the accurate measurement of the Fe3+(aq) concentration required its concentration to be as low as possible at the point of analysis. Question 8 required a unit conversion, but this was missed by many. Questions 15 and 16 assessed s ...
... 20) eliciting less than 60 per cent correct responses. In Question 5 the accurate measurement of the Fe3+(aq) concentration required its concentration to be as low as possible at the point of analysis. Question 8 required a unit conversion, but this was missed by many. Questions 15 and 16 assessed s ...
N Goalby chemrevise.org 1 2.5 Transition Metals Substitution
... This is called the chelate effect This chelate effect can be explained in terms of a positive entropy change in these reactions as more molecules of products than reactants [Cu(H2O)6]2+ (aq) + EDTA4- (aq) [Cu (EDTA)]2- (aq) + 6H2O (l) The copper complex ion has changed from having unidentate ligan ...
... This is called the chelate effect This chelate effect can be explained in terms of a positive entropy change in these reactions as more molecules of products than reactants [Cu(H2O)6]2+ (aq) + EDTA4- (aq) [Cu (EDTA)]2- (aq) + 6H2O (l) The copper complex ion has changed from having unidentate ligan ...
Chem P 2 Siaya - magereza academy
... (ii) Name the substance E. (1 mark) d) Write the equation of the complete combustion of ethanol (1 mark) e) If the relative molecular mass of M is 47,600; determine the value of n. (C = 12.0 , H = 1.0) (2 marks) f) Using a chemical test, state how you can distinguish between CH2 = CH2 and CH3CH3 (2 ...
... (ii) Name the substance E. (1 mark) d) Write the equation of the complete combustion of ethanol (1 mark) e) If the relative molecular mass of M is 47,600; determine the value of n. (C = 12.0 , H = 1.0) (2 marks) f) Using a chemical test, state how you can distinguish between CH2 = CH2 and CH3CH3 (2 ...
Enzymes: “Helper” Protein molecules
... Substance that starts or speeds up a chemical reaction without being in the reaction itself. ...
... Substance that starts or speeds up a chemical reaction without being in the reaction itself. ...
AP Chemistry Summer Assignment - Belle Vernon Area School District
... water. How many moles of HCl would be required to react with 7.5 moles of lime? How many moles of water would be formed? (15 mol HCl; 7.5 mol water) ______________ For each of the following write balanced chemical equations and then solve the problem. ...
... water. How many moles of HCl would be required to react with 7.5 moles of lime? How many moles of water would be formed? (15 mol HCl; 7.5 mol water) ______________ For each of the following write balanced chemical equations and then solve the problem. ...
Stoichiometry
Stoichiometry /ˌstɔɪkiˈɒmɨtri/ is the calculation of relative quantities of reactants and products in chemical reactions.Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.As seen in the image to the right, where the balanced equation is:CH4 + 2 O2 → CO2 + 2 H2O.Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. Stoichiometry measures these quantitative relationships, and is used to determine the amount of products/reactants that are produced/needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry. In the example above, reaction stoichiometry measures the relationship between the methane and oxygen as they react to form carbon dioxide and water.Because of the well known relationship of moles to atomic weights, the ratios that are arrived at by stoichiometry can be used to determine quantities by weight in a reaction described by a balanced equation. This is called composition stoichiometry.Gas stoichiometry deals with reactions involving gases, where the gases are at a known temperature, pressure, and volume and can be assumed to be ideal gases. For gases, the volume ratio is ideally the same by the ideal gas law, but the mass ratio of a single reaction has to be calculated from the molecular masses of the reactants and products. In practice, due to the existence of isotopes, molar masses are used instead when calculating the mass ratio.