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Category: Chemistry

  • Biochem

    Just answer the questions

    also remember that

    Dear Students,

    Due to the unfortunate regional development, the staining and de-staining cycle could not be done.

    I have therefore attached 4 pictures of reference sample gels after these cycles for you to prepare your lab reports. Please follow the below allotments.

    Attached Files (PDF/DOCX): 12467101.pdf

    Note: Content extraction from these files is restricted, please review them manually.

  • Chemistry Question

    Must watch before your exam this question paper will help you for class 8 exam most of the questions from you text book and your chapter

  • I have a chemistry worksheet

    I have a chemistry worksheet it has to many lessons but i only want lesson 3.4 , 3.5 , 3.6 to be done

  • do you want to khow about chemistry combustion reachtion sum…

    do you want to khow about chemistry combustion reachtion summary ?

  • The the existence of water in earth

    Chemistry of elements

  • Which metal do not react with water?

    Most of Metal react with different type of water like hot water ,cold water and steam. But which metal do not react with water at all?

  • Groove’s process

    R-OH+HCL REACTS EITH ANHYD ZNCL GIVES R-CL+ H0

  • Write the molecular formula of oxalic acid (HOOC-COOH 2H2O)…

    Objective: To determine the enthalpy change (H) associated with the reaction of a base with oxalic acid and to verify Hess’s law; when a base reacts with oxalic acid in water. The enthalpy change H of this reaction is measured. The heat given off by the reaction in water is noted. The enthalpy change of the base in the solution is not directly measurable. The molar enthalpy change of oxalic acid can be obtained from solution calorimetry using the reaction with the base in water. The molar enthalpy changes can be observed at different concentrations (4.2 M) and temperatures as necessary. For the reaction of a base with oxalic acid, the enthalpy change of 50 ml can be determined using solution calorimetry, from which the molar enthalpy change in kJ/mol can be calculated. The enthalpy change in these conditions is (4.2 t) kJ, and for a 0.05 mol base reacting with oxalic acid, the enthalpy change is determined for a 50 ml solution, giving an enthalpy change of (0.21 t) kJ.

    Calculation:
    H = 1 / (0.05 / 0.21 t) kJ/mol

    Materials: (1) Oxalic acid dihydrate (H2C2O4 2H2O), (2) base

    Equipment: (1) 250 ml volumetric flask, (2) stirrer, (3) thermometer, (4) Safety, (5) Other Information.
    Important Points:
    1. Concentrated Sulfuric Acid (H2SO4) and Oxalic Acid (H2C2O4 . 2H2O) should not be taken in excess or come into direct contact with skin or eyes.
    2. Do not ingest.
    3. Do not answer in a way that could cause harm to others. Do not handle chemicals casually.
    4. Do not answer in a way that can cause fumes or a hazardous reaction when handling acids.
    5. Do not spontaneously mix chemicals in a beaker without proper instruction.
    6. Do not handle chemicals alone.

    Experimental Data:
    Mass of Oxalic Acid (H2C2O4 . 2H2O) used = 0.05 mole = 6.3 g.
    Mass of water used = 43.7 g = 43.7 ml
    Initial temperature of water, t1 = 25C
    Final temperature of water, t2 = 19.5C

    Calculation:
    Temperature change of solution, t = (t1 – t2) C = 5.5C
    Heat released by Oxalic Acid (H2C2O4 . 2H2O), q = 1 / 0.05 0.21 = 23.1 kJ mol

    Conclusion: Heat released by Oxalic Acid, H = 23.1 kJ mol1|… When a driver drives a motor vehicle, he must always follow traffic rules and obey traffic signals.
    2| While driving, pedestrians should also be careful and cross the road only at designated crossing points.
    3| Drivers should maintain their vehicles in proper condition.

  • Chemistry important questions….

    Requirements:

  • chloroquine Outline

    NOTE: I have included SCIN131_Reference_Only_Outline all references done. Fill in the order provided.

    The outline format: Your outline must be formatted as described and exemplified in the example attached. Please note that this format will be assessed in your grade:

    • Use an alphanumeric sequence.
    • Sections should be indented and aligned.
    • Follow the suggested order of the required elements.
    • Use brief but detailed and descriptive phrases.

    The required elements: Depending on the type of molecule/substance you have chosen, you will address different sets of questions. Please see the category that responds to your selection. Your outline should contain the following elements in this order, and please note that some of these should be your personal observations. Also remember that your presentation (Assignment #3) should only be 10-15 slides, so you need to be concise and clear with your information.

    Introduction

    1. Molecule/substance Introduction
    • The common and IUPAC name of your molecule/substance. Please consult the if needed.
    • Where you can observe your molecule/substance in society and/or in nature.
    • A brief discussion on why you chose your molecule/substance.
    • If possible, a picture and/or video of you safely observing your molecule/substance in the field. If you cannot safely observe it, please include a couple of images from the internet.

    Body

    1. Description
    • You must include a physical description. You can use your personal observations from photographs. If you cannot safely observe your molecule/substance, you must research.
    • Physical Characteristics (appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, etc.)
    • Chemical description: You will need to research the chemical properties of your compound/molecule.
    • Chemical Characteristics (stability in air or other environment, flammability, volatility, etc.)
    1. Discovery
    • Describe the initial discovery of your molecule. Who discovered the molecule, when, how, etc.? Some compounds are part of a larger substance/plant. If this is the case, describe the isolation of your specific compound. The isolation refers to the initial time your molecule/substance was discovered from its raw materials or isolated from its .
    1. Usage and Benefit or Harm to Society
    • Where has your molecule/substance been used? Is it used regularly or has it only been used on occasion? If your compound is one that we ingest when eating, include information on foods it’s commonly found in.
    • Write about the benefit or harm to society caused by your molecule/substance. Many compounds can be used as bioweapons or have both positive and negative impacts. Other compounds have had benefits as medicines or have caused harm as illicit narcotics. All of these are good ideas to start out thinking about, so I’d like you to discuss these impacts on society and the future and any ways you can think the substance may be beneficial or harmful. Please open the following link for some hints on .

    Conclusion

    • This section should contain four to six points that sum up the main points from the body of the outline.
    • Start your conclusive section with one sentence summarizing some basic information about your chosen molecule/substance (common and IUPAC name and physical characteristics).
    • Continue with a brief summary (1-2 sentences) about the isolation and synthesis of the molecule/substance.
    • Include a brief summary (1-2 sentences) about the structure and function of your chosen molecule/substance.
    • Wrap up the conclusive section with a closing note that provides brief information about a unique fact and/or behavior of your chosen.

    Reference Section

    • This is not just the reference page; rather, referencing should occur throughout the outline as it will in your presentation. Therefore, your outline should include both a separate reference page containing a minimum of five sources listed in proper APA reference list format AND internal citations throughout the outline where appropriate.
    • Please be sure to see the resources below for assistance regarding in-text citations and reference list formatting and/or ask me if you have any additional questions.

    Attached Files (PDF/DOCX): SCIN131_Reference_Only_Outline.docx, CHEM180 Outline.pdf

    Note: Content extraction from these files is restricted, please review them manually.