Podcast
Questions and Answers
What color did the solution plus FeCl3 produce initially?
What color did the solution plus FeCl3 produce initially?
What change occurred to the dark violet color over time?
What change occurred to the dark violet color over time?
Which substance is identified as A.R in the given content?
Which substance is identified as A.R in the given content?
What could be inferred about the interaction of thiosulphate with the solution?
What could be inferred about the interaction of thiosulphate with the solution?
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What chemical change does the presence of FeCl3 indicate?
What chemical change does the presence of FeCl3 indicate?
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What happens when a substance is reacted with HCl?
What happens when a substance is reacted with HCl?
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What is the effect of a certain substance on litmus paper?
What is the effect of a certain substance on litmus paper?
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What precipitate is formed when a solution is treated with Nessler's reagent?
What precipitate is formed when a solution is treated with Nessler's reagent?
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Which ion is indicated by the formation of a white precipitate when combined with Na3PO4?
Which ion is indicated by the formation of a white precipitate when combined with Na3PO4?
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What does the reaction of a solution containing Mg2+ and NH4Cl yield?
What does the reaction of a solution containing Mg2+ and NH4Cl yield?
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Which statement is true regarding the use of Nessler's reagent?
Which statement is true regarding the use of Nessler's reagent?
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Which of the following is a characteristic odor related to some chemical reactions?
Which of the following is a characteristic odor related to some chemical reactions?
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Which ion is typically tested with Na2CO3 to produce a white precipitate?
Which ion is typically tested with Na2CO3 to produce a white precipitate?
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Which combination of reagents leads to the precipitation of Sr2+ ions?
Which combination of reagents leads to the precipitation of Sr2+ ions?
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After boiling or scratching, which ion is reduced negatively indicated by the reaction sequence provided?
After boiling or scratching, which ion is reduced negatively indicated by the reaction sequence provided?
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What should be done with a heated object before placing it on the balance?
What should be done with a heated object before placing it on the balance?
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When diluting acid, which method is considered correct?
When diluting acid, which method is considered correct?
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Why is it important never to pour water into acid during dilution?
Why is it important never to pour water into acid during dilution?
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Which of the following statements is true regarding handling heated objects?
Which of the following statements is true regarding handling heated objects?
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What is the primary reason for adding acid to water rather than the other way around?
What is the primary reason for adding acid to water rather than the other way around?
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What effect does the addition of NH4Cl have on the concentration of hydroxide ions, [OH-]?
What effect does the addition of NH4Cl have on the concentration of hydroxide ions, [OH-]?
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Which of the following statements best explains the common ion effect in the context given?
Which of the following statements best explains the common ion effect in the context given?
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Which of these reactions shifts to the left upon the addition of NH4Cl?
Which of these reactions shifts to the left upon the addition of NH4Cl?
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When NH4OH is added, what effect is observed on the concentration of S2-?
When NH4OH is added, what effect is observed on the concentration of S2-?
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What precipitate forms in the presence of NH4Cl and decreased [OH-]?
What precipitate forms in the presence of NH4Cl and decreased [OH-]?
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Which statement accurately describes the solubility of the precipitate formed with nitric acid?
Which statement accurately describes the solubility of the precipitate formed with nitric acid?
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What type of precipitate is formed when testing for sulphate with nitric acid?
What type of precipitate is formed when testing for sulphate with nitric acid?
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Which anions are suggested to result in a soluble precipitate when reacted with nitric acid?
Which anions are suggested to result in a soluble precipitate when reacted with nitric acid?
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When testing for the presence of sulphate using nitric acid, what could be the result of the test?
When testing for the presence of sulphate using nitric acid, what could be the result of the test?
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Which of the following is a likely result for an acid reaction involving a sulphate ion?
Which of the following is a likely result for an acid reaction involving a sulphate ion?
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Study Notes
General Chemistry Practical
- Intended for first-year students in 2024-2025
- Taught by Dr. A.E.
Safety Rules
- Wear protective clothing (lab coat, safety glasses, closed shoes/gloves)
- Never work in the lab without an instructor
- Avoid unauthorized experiments
- Do not remove reagents from designated areas
- Do not taste chemicals or use pipettes to taste chemicals
- Do not return unused chemicals to the original containers
- Do not point, look at or smell reagent test tubes directly
- Do not use droppers, pipettes or spatulas inside reagent bottles
- No food, drink, contact lenses, or gum in the lab
- Clean and dry all equipment and benches before starting
Heating Chemicals
- Point the test tube away from yourself and others during heating
- Use a test tube holder to hold it at an angle over the flame
- Continuously move the test tube during heating
- Never heat flammable liquids directly over an open flame
- Cool heated objects before placing them on a balance
Diluting Acids
- Always add acid to water, never water to acid
Waste Disposal
- Dispose of liquids and water-soluble chemicals in the sink
- Dispose of hazardous organic liquids in special containers in the fume hood
- Dispose of insoluble solids and broken glassware in the waste basket
Leaving the Lab
- Return all equipment and chemicals to their proper places
- Thoroughly clean all equipment 15 minutes before the end of the lab
Material Safety Data Sheets (MSDS)
- MSDS documents contain information about the hazards of a chemical material
- Includes information about potential hazards
Hazards
- Chemical hazards (toxic, corrosive, irritant, explosive)
- Biological hazards (pathogenic microbes)
- Physical hazards (noise, radiation)
- Mechanical or electrical hazards (high voltage)
- Psychological hazards
Hazard Rating Systems
- NFPA uses a color-coded system to indicate the level of hazard for different materials (red for flammability, yellow for reactivity)
Hazards Exposure Limits
- Lethal Concentration 50 (LC50): Concentration of a chemical that causes death in 50% of test animals exposed by inhalation
- Lethal Concentration Low (LCLo): Lowest concentration of a chemical that causes death in one human or animal exposed by inhalation
- Lethal Dose 50 (LD50): Dose of a chemical causing death in 50% of test animals when exposed through routes other than inhalation
- Lethal Dose Low (LDLo): Minimum amount of a chemical that causes death in one human or animal when exposed through routes other than inhalation
Laboratory Equipment and Glassware
- Test tubes
- Beakers
- Watch glasses
- Droppers
- Test tube racks
- Test tube brushes
- Test tube holders
- Reagent bottles
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Description
This quiz covers the essential safety rules and procedures for conducting experiments in the General Chemistry laboratory. Designed for first-year students, it emphasizes the importance of safety precautions to ensure a secure laboratory environment. Master these guidelines to prepare effectively for your chemistry practicals.
