II PUC – CHEMISTRY (34) MODEL QUESTION PAPER - 1 Time: 3hours 15 minutes Maximum marks: 70 Instructions: 1. The question paper has four parts: A‚ B‚ C and D. All parts are compulsory. 2. Write balanced chemical equations and draw labeled diagrams wherever required. 3. Use log tables and the simple calculator if necessary. (Use of scientific calculators is not allowed) PART-A I. Answer ALL of the following. (Each question carries 1 mark) 10x1=10 (Answer each question in one word or
Free Chemical reaction Chlorine Alcohol
PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
Free Atom Electron Covalent bond
composition of materials (metals‚ polymers‚ ceramics and composites). Processing‚ properties and behavior in service environments. No. of Units for Lecture and Laboratory: 3 units lecture No. of Contact Hours per week 3 hours lecture Prerequisites General Chemistry‚ Physics 2 Course Objectives At the end of the course the student must be able to: 1. Identify the importance of materials to mankind through specific examples of materials which have had significant impact to civilization 2. Identify the different
Premium Materials science Engineering Chemistry
Chemistry vacation Assignment Standard -X 1. Name a sodium compound which is used for softening hard water 2. Write the chemical name and formula of baking soda? 3. What will happen if the solution of sodium hydrogen carbonate is heated? Give the equations of the reaction involved? 4. Write the chemical name and the formula of bleaching powder. 5. Write the chemical formula of plaster of Paris? 6. What will happen if heating is not controlled while preparing
Premium Calcium carbonate Chlorine Calcium
Clare Chong P2 ! ! ! ! ! Chemistry Practical 4: Measuring rate of reaction Aim of experiment: To determine the rate of reaction when the concentration of I2 increases. ! ! ! Chemical equation: 2Fe3+ + 2I- --> 2Fe2+ + I2 ! ! ! Apparatus & materials: Apparatus Quantity 50ml Pipette 1 10ml Pipette 1 Pipette bulb 1 100ml beaker 2 50ml Burette 1 250ml Conical Flask 6 Timer 1 Distilled water 100ml or more 50ml Measuring
Premium Chemistry Titration Laboratory glassware
The Chemistry of Toothpaste Toothpaste is not a new thing. It has been traced back to Ancient Egypt. They used a powdered rock and vinegar‚ which created a chemical reaction that dissolves the plaque on teeth. In 1900’s people used hydrogen peroxide and baking soda or chalk‚ pulverised brisk and salt as a toothpaste. Toothpastes today‚ are mostly made up of abrasives‚ surfactants‚ a detergent‚ a thickener‚ a moisturizer‚ water‚ flavouring agents‚ coloring‚ sweeteners‚ fluoride and desensitizers
Premium Oral hygiene Teeth Toothpaste
Major Chemistry questions: 1. Analyse the progress in the development and use of a named bioploymer. This anslysis should name the specific enzyme(s) used or organism used to synthesise the material and an evaluation of the use or potential use of the polymer produced related to it’s properties. Polyhydroxybutanoate (PHB) Progress Analysis: - Bacteria first used to make PHB in 1925 at Pastuer Institute in Paris. - In 1970’s adopted by Imperial Chemical Industries (ICI) – Alcaligenes
Premium Chemical industry Escherichia coli Bacteria
the element (or unknown) examined and the color of the observed flame SOLUTION | NAME | COLOR | KNOWN 1 | BARIUM | GREEN | KNOWN 2 | CALCIUM | RED | KNOWN 3 | SODIUM | ORANGE | KNOWN 4 | RUBIDIUM | PURPLE | KNOWN 5 | POTASSIUM | BLUE | KNOWN 6 | LITHIUM | VIOLET | UNKNOWN 1 | SODIUM | ORANGE | UNKNOWN 2 | POTASSIUM | BLUE | 1. Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did. Unknown 1 was Sodium‚ as
Premium 175 Color
Environmental Chemistry: Water testing in Bouregreg Valley Nowadays we are more and more concerned of environmental issues and especially the ones about water since experts have remarked that wetland regions are disappearing (50% reduction). Wetland regions are very important because they help preserve different wildlife species and also can be considered important indicators of the health of the “blue planet”. One of the most interesting wetland regions is the Bouregreg one that is close to
Premium Irrigation Ammonia Agriculture
He a lt h 0 3 2 3 Fire 0 Re a c t iv it y 2 P e rs o n a l P ro t e c t io n Material Safety Data Sheet Sulfuric acid MSDS Section 1: Chemical Product and Company Identification Product Name: Sulfuric acid Contact Information: Catalog Codes: SLS2539‚ SLS1741‚ SLS3166‚ SLS2371‚ SLS3793 CAS#: 7664-93-9 Sciencelab.com‚ Inc. 14025 Smith Rd. Houston‚ Texas 77396 RTECS: WS5600000 US Sales: 1-800-901-7247 International Sales: 1-281-441-4400 TSCA: TSCA
Premium Sulfuric acid Oxygen Chlorine