X012/12/02
... colour just appears, stop the timer and record the time (in seconds). 4. Repeat this procedure four times but each time use a different concentration of potassium iodide solution. (i) In step 4 of the procedure, what should be done to obtain potassium iodide solutions of different concentration ...
... colour just appears, stop the timer and record the time (in seconds). 4. Repeat this procedure four times but each time use a different concentration of potassium iodide solution. (i) In step 4 of the procedure, what should be done to obtain potassium iodide solutions of different concentration ...
Chapter 6 - Foothill College
... Notes on Standard Enthalpies of Formation, ∆H°f 1. The ∆H°f for all elements in their standard states are zero. Elements are not formed in nature, they already exist. 2. Most ∆H°f values are negative indicating most compounds are more “stable” than their elements. 3. ∆H°f can be used to compare sta ...
... Notes on Standard Enthalpies of Formation, ∆H°f 1. The ∆H°f for all elements in their standard states are zero. Elements are not formed in nature, they already exist. 2. Most ∆H°f values are negative indicating most compounds are more “stable” than their elements. 3. ∆H°f can be used to compare sta ...
Textbook Answer Keys - Mr. Massey`s Chemistry Pages
... 6. A; the relationship between wavelength, frequency and energy is the greater the energy, the shorter (smaller) the wavelength and the higher the frequency; ultraviolet light is high energy/ short wavelength when compared to visible light; infrared light is lower energy/low frequency compare to vis ...
... 6. A; the relationship between wavelength, frequency and energy is the greater the energy, the shorter (smaller) the wavelength and the higher the frequency; ultraviolet light is high energy/ short wavelength when compared to visible light; infrared light is lower energy/low frequency compare to vis ...
Chapter 2 Kinetics of Chemical Reactions - diss.fu
... Arrhenius equation, k(T ) increases with increasing temperature, i.e. the chemical reaction proceeds faster with increasing temperature. However, there are chemical reactions which show a non-Arrhenius temperature dependence. This usually occurs when the chemical process involves the formation of an ...
... Arrhenius equation, k(T ) increases with increasing temperature, i.e. the chemical reaction proceeds faster with increasing temperature. However, there are chemical reactions which show a non-Arrhenius temperature dependence. This usually occurs when the chemical process involves the formation of an ...
Molarity = M (Concentration of Solutions)
... R = 0.08206 L atm / (mol K) = 0.08206 L atm mol-1 K-1 Later R = 8.314 J / (mol K) = 8.314 J mol-1 K-1 An ideal gas is one for which both the volume of molecules and forces between the molecules are so small that they have insignificant effect on its P-V-T behavior. Independent of substance, in the l ...
... R = 0.08206 L atm / (mol K) = 0.08206 L atm mol-1 K-1 Later R = 8.314 J / (mol K) = 8.314 J mol-1 K-1 An ideal gas is one for which both the volume of molecules and forces between the molecules are so small that they have insignificant effect on its P-V-T behavior. Independent of substance, in the l ...
AP® Chemistry
... 10. Establish the relationship between the free energy change, the cell potential, and the equilibrium constant. 11. Discuss and give examples of primary cells, secondary cells, and fuel cells. Solutions and Colloids (2 ½ weeks) States of Matter (Gases, Liquids, and Solids, Solutions) Chapter 10 and ...
... 10. Establish the relationship between the free energy change, the cell potential, and the equilibrium constant. 11. Discuss and give examples of primary cells, secondary cells, and fuel cells. Solutions and Colloids (2 ½ weeks) States of Matter (Gases, Liquids, and Solids, Solutions) Chapter 10 and ...
1)A neutral atom has no overall charge, and ion is a
... 5)a)Create graph, will be gone over in class. b)These are the smallest atoms on each of their respective rows, and electrons are being removed from filled orbitals, which have strong stability, which takes a lot of energy to do. c)The valence electrons experience a smaller nuclear force of attractio ...
... 5)a)Create graph, will be gone over in class. b)These are the smallest atoms on each of their respective rows, and electrons are being removed from filled orbitals, which have strong stability, which takes a lot of energy to do. c)The valence electrons experience a smaller nuclear force of attractio ...
16ElectEnergycapac
... is at the same potential. On an equipotential surface, each point on the surface is at the same potential. The equipotential line or surface is perpendicular to the direction of the electric field lines at every point. Thus, if the electric field pattern is known, it is possible to determine the pat ...
... is at the same potential. On an equipotential surface, each point on the surface is at the same potential. The equipotential line or surface is perpendicular to the direction of the electric field lines at every point. Thus, if the electric field pattern is known, it is possible to determine the pat ...
CHEMISTRY A
... (b) Curly arrows are used in reaction mechanisms to show the movement of electron pairs during chemical reactions. Use curly arrows to outline the mechanism for the addition reaction of methylpropene with bromine. The structure of methylpropene has been drawn for you. Include relevant dipoles in you ...
... (b) Curly arrows are used in reaction mechanisms to show the movement of electron pairs during chemical reactions. Use curly arrows to outline the mechanism for the addition reaction of methylpropene with bromine. The structure of methylpropene has been drawn for you. Include relevant dipoles in you ...
Unit 6 Study Guide - Dorman High School
... The factors that most commonly cause chemical reactions to occur are all the following except A) formation of a solid B) formation of a gas C) formation of water D) transfer of electrons E) a decrease in temperature ...
... The factors that most commonly cause chemical reactions to occur are all the following except A) formation of a solid B) formation of a gas C) formation of water D) transfer of electrons E) a decrease in temperature ...
1. Explain electrophile and nucleophile. 2. Explain
... 22. Balance this reaction by Ion-electron method:a.MnO4-(aq) +I- (aq) ...
... 22. Balance this reaction by Ion-electron method:a.MnO4-(aq) +I- (aq) ...
Homework,1 Atoms, molecules, and ions
... 8- Which of the following quantities ( heat, work, enthalpy, internal energy) depend only on the end points and not on the path followed in a process? a) heat b) work c) enthalpy and internal energy d) enthalpy e) internal energy 9- When 0.215 mol NH3 is formed from nitrogen and hydrogen, 9.91 kJ of ...
... 8- Which of the following quantities ( heat, work, enthalpy, internal energy) depend only on the end points and not on the path followed in a process? a) heat b) work c) enthalpy and internal energy d) enthalpy e) internal energy 9- When 0.215 mol NH3 is formed from nitrogen and hydrogen, 9.91 kJ of ...
Why do molecules form the way they do?
... aluminum (mass 12 g) can is raised by 64 K. What amount of energy was released by the Dorito? You may assume that no heat was lost to the surrounding and it was completely transferred to the can and water. 5) Use the following 2 reactions calculate the DHrxn for 2NO2(g) N2O4(g). N2(g) + 2O2(g) N ...
... aluminum (mass 12 g) can is raised by 64 K. What amount of energy was released by the Dorito? You may assume that no heat was lost to the surrounding and it was completely transferred to the can and water. 5) Use the following 2 reactions calculate the DHrxn for 2NO2(g) N2O4(g). N2(g) + 2O2(g) N ...
Name and form
... chemical energy Compare the energy stored in two or three different types of fuels Explain what a fossil fuel is and how they are formed Understand the advantages and disadvantages of fossil fuel Know the difference between renewable and non renewable energy. Provide a balanced argument to weigh up ...
... chemical energy Compare the energy stored in two or three different types of fuels Explain what a fossil fuel is and how they are formed Understand the advantages and disadvantages of fossil fuel Know the difference between renewable and non renewable energy. Provide a balanced argument to weigh up ...
reactions taking place within cells
... Thermodynamics Study of conversion of energy between heat and other forms Thermochemistry Relationship between chemical reactions and heat changes Enthalpy H Measure of energy(heat content) Change Final value minus the initial value Enthalpy change H kJmol –1 Heat energy transferred in a reaction ...
... Thermodynamics Study of conversion of energy between heat and other forms Thermochemistry Relationship between chemical reactions and heat changes Enthalpy H Measure of energy(heat content) Change Final value minus the initial value Enthalpy change H kJmol –1 Heat energy transferred in a reaction ...
practice unit #2 exam
... A. The higher the activation energy barrier, the faster the reaction. B. Increasing the concentration of a reactant may increase the rate of a reaction. C. Adding a catalyst speeds up the rate of reaction for both the forward and reverse reactions. D. Increasing the concentration increases the rate ...
... A. The higher the activation energy barrier, the faster the reaction. B. Increasing the concentration of a reactant may increase the rate of a reaction. C. Adding a catalyst speeds up the rate of reaction for both the forward and reverse reactions. D. Increasing the concentration increases the rate ...
Semester 1 exam review
... 3. In your experiment above what is your control group? 4. In your experiment above, what is your dependent and independent variable? 5. What is the function of a control group? 6. Why is the metric system is better than the standard system. 7. I have 2 hairs stacked on top of each other to be used ...
... 3. In your experiment above what is your control group? 4. In your experiment above, what is your dependent and independent variable? 5. What is the function of a control group? 6. Why is the metric system is better than the standard system. 7. I have 2 hairs stacked on top of each other to be used ...
The Major Classes of Chemical Reactions
... the amazing variety of chemical reactions. Rapid chemical changes occur among gas molecules as sunlight bathes the atmosphere or lightning rips through a stormy sky (see margin). Oceans are gigantic containers in which aqueous reaction chemistry goes on unceasingly. In every cell of your body, thous ...
... the amazing variety of chemical reactions. Rapid chemical changes occur among gas molecules as sunlight bathes the atmosphere or lightning rips through a stormy sky (see margin). Oceans are gigantic containers in which aqueous reaction chemistry goes on unceasingly. In every cell of your body, thous ...
ANALYSIS OF THE SILVER GROUP CATIONS
... may be possible to test for one particular ion in the presence of just one or two others. Alternatively, each subgroup of just a few ions may be separated further so that each ion in the subgroup ends up in a different test tube where its presence can be confirmed by other chemical tests. The chemic ...
... may be possible to test for one particular ion in the presence of just one or two others. Alternatively, each subgroup of just a few ions may be separated further so that each ion in the subgroup ends up in a different test tube where its presence can be confirmed by other chemical tests. The chemic ...
Quantum Mechanics Gibbs free energy
... Neither the forward nor the reverse reaction prevails (Equilibrium) ...
... Neither the forward nor the reverse reaction prevails (Equilibrium) ...
p Block Elements General Configuration: ns2 np1
... It is a colourless gas with rotten fish smell and is highly poisonous. It explodes in contact with traces of oxidising agents like HNO3, Cl2 and Br2 vapours. light Red P + H2 PH3(aq) 3CuSO4 + 2PH3 → Cu3P2 + 3H2SO4 3HgCl2 + 2PH3 → Hg3P2 + 6HCl (mercury chloride) Phosphine is weakly basic and gives ph ...
... It is a colourless gas with rotten fish smell and is highly poisonous. It explodes in contact with traces of oxidising agents like HNO3, Cl2 and Br2 vapours. light Red P + H2 PH3(aq) 3CuSO4 + 2PH3 → Cu3P2 + 3H2SO4 3HgCl2 + 2PH3 → Hg3P2 + 6HCl (mercury chloride) Phosphine is weakly basic and gives ph ...
CIS Exam Questions
... CaCO3(s) + 2HNO3(aq) → Ca(NO3)2(aq) + H2O(l) + CO2(g) 0·05 mol of calcium carbonate was added to a solution containing 0·08 mol of nitric acid. Which of the following statements is true? A 0·05 mol of carbon dioxide is produced. B 0·08 mol of calcium nitrate is produced. C Calcium carbonate is in ex ...
... CaCO3(s) + 2HNO3(aq) → Ca(NO3)2(aq) + H2O(l) + CO2(g) 0·05 mol of calcium carbonate was added to a solution containing 0·08 mol of nitric acid. Which of the following statements is true? A 0·05 mol of carbon dioxide is produced. B 0·08 mol of calcium nitrate is produced. C Calcium carbonate is in ex ...
SAMPLE QUESTION PAPER SIR.S.M.TAHIR CHEMISTRY Mob: 9557076999
... Formulate the galvanic cell in which the following reaction takes place. Zn(s) + 2Ag+ (aq) ...
... Formulate the galvanic cell in which the following reaction takes place. Zn(s) + 2Ag+ (aq) ...
Unit 3 Exam Level Questions
... A 2NO2(g) N2O4(g) B H2(g) + I2(g) 2HI(g) C N2(g) + 3H2(g) 2NH3(g) D 2NO(g) + O2(g) 2NO2(g) 3. A few drops of concentrated sulphuric acid were added to a mixture of 0·1 mol of methanol and 0·2 mol of ethanoic acid. Even after a considerable time, the reaction mixture was found to contain some of each ...
... A 2NO2(g) N2O4(g) B H2(g) + I2(g) 2HI(g) C N2(g) + 3H2(g) 2NH3(g) D 2NO(g) + O2(g) 2NO2(g) 3. A few drops of concentrated sulphuric acid were added to a mixture of 0·1 mol of methanol and 0·2 mol of ethanoic acid. Even after a considerable time, the reaction mixture was found to contain some of each ...
Electrochemistry
Electrochemistry is the branch of physical chemistry that studies chemical reactions which take place at the interface of an electrode, usually a solid metal or a semiconductor, and an ionic conductor, the electrolyte. These reactions involve electric charges moving between the electrodes and the electrolyte (or ionic species in a solution). Thus electrochemistry deals with the interaction between electrical energy and chemical change.When a chemical reaction is caused by an externally supplied current, as in electrolysis, or if an electric current is produced by a spontaneous chemical reaction as in a battery, it is called an electrochemical reaction. Chemical reactions where electrons are transferred directly between molecules and/or atoms are called oxidation-reduction or (redox) reactions. In general, electrochemistry describes the overall reactions when individual redox reactions are separate but connected by an external electric circuit and an intervening electrolyte.