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3f8034d0-f7be-4de4-82e3-4ffef429ae45 cheat sheet ap chemistry unit 4 https://k-chemistry.my.canva.site/ap-chemistry-unit-4-cheat-sheet Summary

This is placeholder text. To change this content, double-click on the element and click Change Content. < Back Chapter 1 Exercises Page 1 Exercise SABIS Grade 11 This is placeholder text. To change this content, double-click on the element and click Change Content. These are the exercises for Equilibrium SABIS Grade 11 Chemistry Part 1 Previous Next

6f460996-271a-446a-80b8-bb821748248a cheat sheet ap chemistry unit 1 https://k-chemistry.my.canva.site/cheat-sheet-for-ap-chemistry-unit-1 Summary

4eb817d2-5695-497b-867c-4c5fd2b9a358 Fractional Coefficients Summary Coefficients in a chemical equation that are fractions, used to balance the equation.

b8a83502-368f-4f79-9ba2-e31bd0809436 Observations for the reaction of alkali metal with water: Summary  Piece of metal floats (alkali metals have low density).  Piece of metal darts around.  A hissing sound is heard due to the evolution of a gas.  If red litmus paper is dipped in the solution, the paper turns blue due to the formation of the alkali metal hydroxide.  If few drops of phenolphthalein indicator are added to the water solution turns pink due to the formation of alkali metal hydroxide.  If the gas produced is tested with a lit splint, it burns with a squeaky pop sound.

0a7a66fd-4f25-4b1e-ad77-f25acc002dd8 neutralization reaction Summary Exothermic Reaction

53e49697-409e-44ad-99bf-95f259a539b6 Health and safety issues related to Rate of reaction SABIS Summary Increasing the surface area of solid (by reduction of particle size) may cause explosion in some cases. For example  In flour mills, the air can fill with fine flour dust which has very large surface area. A spark can cause the flour to catch fire and explode.  In coal mines where the air is filled with very fine coal dust.

b5590a04-5fc0-46ab-8e31-4175176ffe31 < Back Previous Next Acids Bases and Salts Next Topic

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d4063ce3-9a72-4962-9b92-64896188b833 Know that a calorimeter is used to determine ΔH at constant V Summary Calorimeters are devices used in thermodynamics to measure the heat energy exchanged during a chemical or physical process. They are particularly useful in determining the change in enthalpy (ΔH) of a system. The statement "Know that a calorimeter is used to determine ΔH at constant V" means that a calorimeter is designed to measure the change in enthalpy at constant volume (V). In a constant volume calorimeter, the volume of the system remains constant throughout the process, allowing for the determination of ΔH under these specific conditions. When using a calorimeter to determine the heat of combustion of a substance with oxygen, we can obtain the ΔH for the substance at constant pressure (c). This is because combustion reactions typically occur under atmospheric pressure, and a constant pressure calorimeter is commonly used to measure the heat changes associated with these reactions. In a constant pressure calorimeter, the pressure remains constant throughout the process. This is achieved by using an open system or ensuring that the pressure inside the calorimeter is the same as the surrounding atmospheric pressure. By maintaining a constant pressure, the heat exchange can be accurately measured and used to determine the enthalpy change (ΔH) for the substance. The option (c) ΔH for the substance at constant pressure aligns with the concept of using a calorimeter to determine the heat of combustion. It takes into account the fact that combustion reactions usually occur at constant atmospheric pressure and can be accurately measured in a constant pressure calorimeter. The other options can be eliminated as follows: Option (a) ΔH for a constant mass of the substance is not necessarily true because the mass of the substance may change during the combustion process. Option (b) ΔH for the substance at constant temperature is not accurate because the temperature may change during the combustion process. Option (d) ΔH for the substance at constant volume is not applicable as the volume usually changes during the combustion process. Option (e) ΔH for the substance at constant product PV is not directly related to the use of a calorimeter in determining the heat of combustion. In summary, a calorimeter is used to determine the change in enthalpy (ΔH) at constant volume (V). When using a calorimeter to measure the heat of combustion of a substance with oxygen, the ΔH for the substance can be determined at constant pressure (c). This is achieved using a constant pressure calorimeter, which allows for accurate measurement of the heat exchange during the combustion process.

Worksheets to practice all concepts of AP chemistry for Free AP Chemistry Worksheets Click to preview Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8 Unit 9 Unit 1 Topic 1 Worksheet Moles and Molar Mass Unit 1 Topic 2 Worksheet Mass Spectroscopy of Elements Unit 1 Topic 3 Worksheet Elemental Composition of Pure Substances Unit 1 Topic 4 Worksheet Elemental Composition of Pure Substances Unit 1 Topic 5 Worksheet Atomic Structure and Electron Configuration Unit 1 Topic 6 Worksheet Photoelectron Spectroscopy (PES) Unit 1 Topic 7 Worksheet Periodic Trends Unit 1 Topic 8 Worksheet Valence Electrons and Ionic Compounds Unit 2 Topic 1 Worksheet Types of Chemical Bonds Unit 2 Topic 1 Worksheet Answers Types of Chemical Bonds answers Unit 2 Topic 2 Worksheet Types of Chemical Bonds Unit 2 Topic 2 Worksheet Answers Types of Chemical Bonds answers Unit 2 Topic 3 Worksheet Structure of Ionic Solids Unit 2 Topic 3 Worksheet Answers Structure of Ionic Solids answers Unit 2 Topic 4 Worksheet Structure of Metals and Alloys Unit 2 Topic 4 Worksheet answers Structure of Metals and Alloys answers Unit 2 Topic 5 Worksheet Lewis Diagrams Unit 2 Topic 5 Worksheet Answers Lewis Diagrams Answers Unit 2 Topic 6 Worksheet 6 Resonance and formal charge Unit 2 Topic 6 Worksheet Answers Resonance and formal charge Answers Unit 2 Topic 7 Worksheet VSEPR and Hybridization Unit 2 Topic 7 Worksheet Answers VSEPR and Hybridization Answers