1. Energetics si ygrene neht srucco egnahc yplahtne na fI dna )rH In an exothermic change energy is transferred from the system (chemicals) to the surroundings. The products have less energy than the reactants In an endothermic change‚ energy is transferred from the surroundings to the system (chemicals). The products have more energy than the reactants Enthalpy changes are normally quoted at standard conditions. Standard conditions are : • 1 atm pressure • 298 K (room temperature or 25oC) • Solutions
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CHM138LL Lab 5 Stoichiometry Analysis of a Chemical Reaction Name: A. Data Tables Item Measured/Quantity Calculated Mass (in grams) Iron nails (before reaction) 7.75g 5.5g Iron nails (after reaction) Mass of iron consumed 2.25g Initial mass of filter paper (before filtration) 0.86g 3.52g 2.66g Mass of filter paper and solid product Mass of solid product Show work below for “mass of iron consumed” and “mass of solid formed” calculations: 7.75g-5.5g=2.25g 3.52g-
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question and answer book is provided with this data book. Students are NOT permitted to bring mobile phones and/or any other unauthorised electronic devices into the examination room. © VICTORIAN CURRICULUM AND ASSESSMENT AUTHORITY 2012 2012 CHEM DATA BOOK 2 Table of contents page 1. Periodic table of the elements 3 2. The electrochemical series 4 3. Physical constants 5 4. SI prefixes‚ their symbols and values 5 5. 1H 6.
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www.moalims.com KBSE Guess Paper IX Biology 2010 NEW PATTERN Section "A" (Multiple Choice Question) Q.1. Prepare multiple choice questions from your text book. Section "B" (Short Questions Answer - Zoology) Q.2. Define the following Physiology Ecology Cytology Taxonomy Palaeontology Genetics Bio-Chemists Embryology OR Write contributions of Al-Farabi‚ Ibn-Al-Haitham‚ Bu-Ali Sina in the field of Biology. Q.3. Write contributions of Galileo‚ Robbert Hook‚ Louis
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Name: |Date:| Exp 10: Caloric Content of Food|| Your Data: |First Item|Second Item|Third Item| What Food are you using|||| |||| Mass of empty beaker|||| Mass of beaker and water|||| Net Mass of the water|||| |||| Initial mass of food and holder|||| Final mass of burnt food and holder|||| Net Mass of the burnt food|||| |||| Initial temp of the water|||| Final temp of the water|||| ∆ T in C (change in temperature)|||| Calculations: Show your numbers in the following calculation
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Problem Set Introduction to Stoichiometry Name: ______________________________________________________ Course/Yr/Section: ____________ Date:_____________ Direction: Analyze and solve each problem carefully‚ write the solution on the space provided. Box your final answer/s. (10pts each) Determine the molar mass of the following: a. Al(NO3)3 b. ZnSO4 c. Ba(C2H3O2)2 d. NaHCO3 CH3COOH Calculate the percentage oxygen in the following compounds: a. Na2CO3 b. BaSO4 c. BaO
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Assessing Sulphur Dioxide in Wine by Titration Procedure 1. Transfer 20.0 mL of wine using a pipette to each of three 250 mL conical flasks. 2. To each flask add about 12 mL of 1 M sodium hydroxide solution and allow the flasks to stand for 15 minutes. This releases the SO2 bound in complex compounds in the wine. 3. Fill a burette with standard iodine solution. Record the initial burette reading and the concentration of the solution. 4. To one flask‚ add about 10 mL of 2 M sulfuric acid
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www.igcse.at.ua ORGANIC CHEMISTRY OIL and its many useful PRODUCTS The origin of oil Crude oil is formed from organic material of the remains of plant and animal organisms that lived millions of years ago. These remains form sediments eg at the bottom of seas‚ and become buried under layers of sedimentary rock. They decay‚ without air (oxygen)‚ under the action of heat and pressure to form crude oil over millions of years. It is a fossil fuel because it is formed from
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Temperature‚ T (°C) RESULT Preassure‚ P (bar) | | | | | | Measure slope‚ dT/dP | Calculated slope‚Tvg/hfg | Gauge | Absolute | Increase (°C) | Decrease(°C) | AverageTavg (°C) | AverageTavg (K) | | | 0.1 | 1.1 | 104.0 | 106.6 | 105.30 | 378.45 | - | 0.260 | 0.2 | 1.2 | 107.3 | 109.3 | 108.30 | 381.45 | 0.3 | 0.243 | 0.3 | 1.3 | 109.8 | 111.8 | 110.80 | 383.95 | 0.25 | 0.227 | 0.4 | 1.4 | 112.0 | 113.9 | 112.95 | 386.10 | 0.22 | 0.213 | 0.5 | 1.5 | 114.3 | 115.9 | 115.10
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Directions: The following questions involve more practice with radioactive decay half-life. Complete the problems to the best of your ability. This assignment is due by next WEDNESDAY‚ November 16th. 1. If 100.0 g of carbon-14 decays until only 25.0 g of carbon is left after 11 460 y‚ what is the half-life of carbon-14? a. Calculate how many half-lives have passed during the decay of the 100.0 g sample. 100 grams/2 50 grams/2 25grams…2 half lives have passed b. Solve for the half-life
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