Energy
... Since enthalpy is a state function (path independent) the change in enthalpy for the combination of the first two processes has to be the same as the change in enthalpy for the third process. This is a simple example of a general principle called Hess’ law. ...
... Since enthalpy is a state function (path independent) the change in enthalpy for the combination of the first two processes has to be the same as the change in enthalpy for the third process. This is a simple example of a general principle called Hess’ law. ...
physical setting chemistry
... Sulfur dioxide, SO2, is one gas produced when fossil fuels are burned. When this gas reacts with water in the atmosphere, an acid is produced forming acid rain. The pH of the water in a lake changes when acid rain collects in the lake. Two samples of the same rainwater are tested using two indicator ...
... Sulfur dioxide, SO2, is one gas produced when fossil fuels are burned. When this gas reacts with water in the atmosphere, an acid is produced forming acid rain. The pH of the water in a lake changes when acid rain collects in the lake. Two samples of the same rainwater are tested using two indicator ...
Problems - Department of Chemistry HKU
... where p0 is the initial pressure and p is the final pressure of cyclopropane. What is the order and rate constant for the reaction under these conditions? 21.10 The addition of hydrogen halides to alkenes has played a fundamental role in the investigation of organic reaction mechanisms. In one study ...
... where p0 is the initial pressure and p is the final pressure of cyclopropane. What is the order and rate constant for the reaction under these conditions? 21.10 The addition of hydrogen halides to alkenes has played a fundamental role in the investigation of organic reaction mechanisms. In one study ...
PDF Electrochemistry- II
... contact with the same or different electrolytes. In the latter case, the two electrode compartments are connected by a salt bridge for electrical contact between the electrolytes. A salt bridge is a double bent glass tube containing a concentrated solution of an electrolyte (usually KCl, KNO3 or NH4 ...
... contact with the same or different electrolytes. In the latter case, the two electrode compartments are connected by a salt bridge for electrical contact between the electrolytes. A salt bridge is a double bent glass tube containing a concentrated solution of an electrolyte (usually KCl, KNO3 or NH4 ...
types of reactions
... ex: 4 NH3 + 2 O2 4 NO3 + 6 H2O (all divisible by 2, so simplify) 2 NH3 + O2 2 NO3 + 3 H2O ...
... ex: 4 NH3 + 2 O2 4 NO3 + 6 H2O (all divisible by 2, so simplify) 2 NH3 + O2 2 NO3 + 3 H2O ...
Document
... 50cm3 of 1M HCl is placed in a polystyrene cup. 50cm3 of 1M NaOH solution is placed in a beaker. The temperature of each is 18oC. The NaOH solution is then added to the HCl in the cup. The temperature increases to 24oC. Calculate the enthalpy change for this reaction. Heat energy change = 100 x 4.2 ...
... 50cm3 of 1M HCl is placed in a polystyrene cup. 50cm3 of 1M NaOH solution is placed in a beaker. The temperature of each is 18oC. The NaOH solution is then added to the HCl in the cup. The temperature increases to 24oC. Calculate the enthalpy change for this reaction. Heat energy change = 100 x 4.2 ...
Types of Chemical Reactions
... 1. Masses give information about # of p+, n0, e– 2. It is useful to know relative mass E.g. Q - What ratio is needed to make H2O? A - 2:1 by atoms, but 2:16 by mass It is useful to associate atomic mass with a mass in grams. It has been found that 1g H, 12g C, or 23g Na have 6.02x1023 atoms 6.02 ...
... 1. Masses give information about # of p+, n0, e– 2. It is useful to know relative mass E.g. Q - What ratio is needed to make H2O? A - 2:1 by atoms, but 2:16 by mass It is useful to associate atomic mass with a mass in grams. It has been found that 1g H, 12g C, or 23g Na have 6.02x1023 atoms 6.02 ...
Combustion thermodynamics
... A detailed description of fuels, oxidisers, their mixing, the ignition process and the kinetics of its propagation, can be found elsewhere. A succinct description of the process in Fig. 1 may be as follows. As it will be shown below, at least 9.5 m3 of air are required for the complete combustion of ...
... A detailed description of fuels, oxidisers, their mixing, the ignition process and the kinetics of its propagation, can be found elsewhere. A succinct description of the process in Fig. 1 may be as follows. As it will be shown below, at least 9.5 m3 of air are required for the complete combustion of ...
NO - Blue Devil Chem
... Sucrose or common table sugar was mixed with concentrated sulfuric acid. Soon an exothermic reaction takes places during which a column of carbon rises from the beaker and a cloud of steam is produced. Concentrated sulfuric acid acts as a catalyst to dehydrate sucrose to produce carbon and water. Th ...
... Sucrose or common table sugar was mixed with concentrated sulfuric acid. Soon an exothermic reaction takes places during which a column of carbon rises from the beaker and a cloud of steam is produced. Concentrated sulfuric acid acts as a catalyst to dehydrate sucrose to produce carbon and water. Th ...
Lab # 18
... 4. Compare and contrast the Celsius (°C) and the Kelvin (K) or absolute temperature scale. Include boiling point and melting point of water, as well as absolute zero. 5. State Charles’ Law. 6. Write Charles’ Law as a mathematical formula. 7. What is the equation used to convert between degrees Celsi ...
... 4. Compare and contrast the Celsius (°C) and the Kelvin (K) or absolute temperature scale. Include boiling point and melting point of water, as well as absolute zero. 5. State Charles’ Law. 6. Write Charles’ Law as a mathematical formula. 7. What is the equation used to convert between degrees Celsi ...
Lecture 7
... Anomalous or unusual properties of the first member of the group, beryllium 1. Beryllium oxide is amphoteric as base: BeO(s) + 2H3O+(aq) → Be2+(aq) + 3H2O(l) as acid: BeO(s) + 2OH-(aq) + H2O(l) → Be(OH)4-(aq) 2. Beryllium chloride forms a layer lattice rather than an ionic one. In this way it is lik ...
... Anomalous or unusual properties of the first member of the group, beryllium 1. Beryllium oxide is amphoteric as base: BeO(s) + 2H3O+(aq) → Be2+(aq) + 3H2O(l) as acid: BeO(s) + 2OH-(aq) + H2O(l) → Be(OH)4-(aq) 2. Beryllium chloride forms a layer lattice rather than an ionic one. In this way it is lik ...
6 Thermodynamics
... When 79.62 g of CH3CHO is consumed, 4,309 kJ of energy was released. The process takes place in a container against an external pressure of 101.3 kPa and temperature of 25°C. The volume of the container decreases by 66.3 L. (1 kPa·L = 1 J) (a) What is the value of w and ∆E of the system in J? q = −4 ...
... When 79.62 g of CH3CHO is consumed, 4,309 kJ of energy was released. The process takes place in a container against an external pressure of 101.3 kPa and temperature of 25°C. The volume of the container decreases by 66.3 L. (1 kPa·L = 1 J) (a) What is the value of w and ∆E of the system in J? q = −4 ...
Thermodynamics
... During the polymerization of ethylene, one mole of ethylene breaks i.e. one C = C double bond breaks and the two CH2 ✂ groups are linked with C ✂ C single bonds thus forming three single bonds (two single bonds are formed when each CH2 ✂ group of ethylene links with one CH2 ✂ group of another ethyle ...
... During the polymerization of ethylene, one mole of ethylene breaks i.e. one C = C double bond breaks and the two CH2 ✂ groups are linked with C ✂ C single bonds thus forming three single bonds (two single bonds are formed when each CH2 ✂ group of ethylene links with one CH2 ✂ group of another ethyle ...
ap 2005 chemistry_b scoring guidelines - AP Central
... Write the formulas to show the reactants and the products for any FIVE of the laboratory situations described below. Answers to more than five choices will not be graded. In all cases, a reaction occurs. Assume that solutions are aqueous unless otherwise indicated. Represent substances in solution a ...
... Write the formulas to show the reactants and the products for any FIVE of the laboratory situations described below. Answers to more than five choices will not be graded. In all cases, a reaction occurs. Assume that solutions are aqueous unless otherwise indicated. Represent substances in solution a ...
Thermochemistry Exam Review Questions
... an unknown solution. What is the pH for the unknown solution likely to be? A. 1.2 B. 3.0 C. 5.3 D. 9.0 12. What is the name of the ion when a positively charged proton combines with a water molecule? A. ammonium ion B. hydrogen ion C. hydronium ion D. hydroxide ion 13. What is the term for a substan ...
... an unknown solution. What is the pH for the unknown solution likely to be? A. 1.2 B. 3.0 C. 5.3 D. 9.0 12. What is the name of the ion when a positively charged proton combines with a water molecule? A. ammonium ion B. hydrogen ion C. hydronium ion D. hydroxide ion 13. What is the term for a substan ...
2010
... Other than temperature change, state one other observation that was made when the most reactive metal was added to the copper(II) sulphate solution. (1 mark) ...
... Other than temperature change, state one other observation that was made when the most reactive metal was added to the copper(II) sulphate solution. (1 mark) ...
Mole Concept and Stoichiometry
... standard temperature and pressure ( STP = O0 C and 1 atm ), has a mass of 31.998 grams and contains about 6.022 x 1023 molecules of oxygen. Measuring one of these quantities allows the calculation of the others and this is frequently done in stoichiometry. One interpretation : A specific number of p ...
... standard temperature and pressure ( STP = O0 C and 1 atm ), has a mass of 31.998 grams and contains about 6.022 x 1023 molecules of oxygen. Measuring one of these quantities allows the calculation of the others and this is frequently done in stoichiometry. One interpretation : A specific number of p ...
Sample Exercise 20.1 Identifying Oxidizing and Reducing Agents
... reduction process (electrons on the reactant side of the equation). By definition, the reduction process occurs at the cathode. The second half-reaction is the oxidation process (electrons on the product side of the equation), which occurs at the anode. The I– ions are the source of electrons, and t ...
... reduction process (electrons on the reactant side of the equation). By definition, the reduction process occurs at the cathode. The second half-reaction is the oxidation process (electrons on the product side of the equation), which occurs at the anode. The I– ions are the source of electrons, and t ...
Document
... the top. The products are at the bottom. The products have less enthalpy than the reactants, so enthalpy is evolved as heat. The signs of both q and DH are negative. ...
... the top. The products are at the bottom. The products have less enthalpy than the reactants, so enthalpy is evolved as heat. The signs of both q and DH are negative. ...
Chemistry - Set as Home Page
... On heating, if a solid changes directly into vapours without changing into the liquid state, the phenomenon is called __________. Each orbital in an atom can be completely described by __________. In a molecule of alkene, __________ restricts the rotation of the group of atoms at either end of the m ...
... On heating, if a solid changes directly into vapours without changing into the liquid state, the phenomenon is called __________. Each orbital in an atom can be completely described by __________. In a molecule of alkene, __________ restricts the rotation of the group of atoms at either end of the m ...
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.