18 Questions
What does precision in gel electrophoresis refer to?
The standard deviation of repeated measurements
Which technique evaluates precision in terms of standard deviation?
Gel electrophoresis
What does 'repeatability' refer to in analytical chemistry?
Consistency between individual values
Which technique assesses precision based on replicate measurements performed by the same person, at the same time, on the same sample?
Flow cytometry
What is the purpose of a volumetric flask in a laboratory setting?
To deliver precise volumes of liquid
Which tool would be most suitable for holding a hot beaker in a laboratory?
Utility clamp
What is the first step in the scientific method?
Observe and Ask Question
Which piece of glassware is commonly used for accurate measurement of liquid volumes?
Graduated cylinder
What is the purpose of a burette in a laboratory setting?
Accurate dispensing of liquids
Which laboratory technique involves separating solid particles from a liquid by pouring the liquid through a filter?
Filtration
What is the function of Litmus paper in a laboratory?
Measure pH of a solution
Which tool is commonly used for transferring small amounts of solid chemicals?
Mortar and pestle
What is the purpose of placing the cover of reagents upside down?
To avoid contamination of the reagent
What is the correct procedure for heating liquid in a test tube?
Fill the test tube not more than half full, wipe the tube dry on the outside, and grasp the tube with a test tube holder.
What is a common misconception when transferring liquid to a container with a narrow mouth?
Using a glass rod to guide the liquid is unnecessary.
Why should solutions of acids and bases be diluted in large amounts of water before disposal down the sink?
To prevent environmental damage or safety hazards
What should be done when heating liquid in a test tube according to the provided text?
Wipe the outside of the test tube after filling it halfway
What is the main purpose of using the wafting method when smelling solid or liquid substances?
To avoid getting too close to potentially harmful substances
Study Notes
Gel Electrophoresis
- Precision in gel electrophoresis refers to the closeness of the results obtained from repeated measurements.
Analytical Chemistry
- 'Repeatability' in analytical chemistry refers to the ability of a measurement technique to produce the same result when repeated under the same conditions.
Technique Evaluation
- Standard deviation is used to evaluate precision in terms of the spread of results.
- The technique that assesses precision based on replicate measurements performed by the same person, at the same time, on the same sample is repeatability.
Laboratory Equipment
- A volumetric flask is used to prepare and mix solutions of precise concentrations in a laboratory setting.
- A crucible tongs is the most suitable tool for holding a hot beaker in a laboratory.
- A pipette is commonly used for accurate measurement of liquid volumes.
- A burette is used to measure the volume of a liquid accurately, especially in titration reactions.
Laboratory Techniques
- Filtration is the laboratory technique that involves separating solid particles from a liquid by pouring the liquid through a filter.
- Litmus paper is used to test the pH of a substance in a laboratory.
Laboratory Safety
- A spatula is commonly used for transferring small amounts of solid chemicals.
- The cover of reagents should be placed upside down to prevent contamination.
- When heating liquid in a test tube, the liquid should be heated slowly and carefully to prevent boiling or splashing.
- When transferring liquid to a container with a narrow mouth, the liquid should be poured slowly and carefully to prevent spills.
- Solutions of acids and bases should be diluted in large amounts of water before disposal down the sink to prevent damage to the drain or pipes.
- When heating liquid in a test tube, the tube should be held at an angle and the heat source should be removed as soon as the liquid starts to boil.
- The wafting method is used when smelling solid or liquid substances to prevent inhaling the vapors directly.
Test your knowledge of different tools and equipment used in a chemistry lab, ranging from PPEs to glassware and apparatus for containment and delivery. Identify items like beakers, ring stands, volumetric flasks, and more.
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