Colorimeter - Study guides, Revision notes & Summaries

A Level Biology: PAG Extension Questions and Answers | Latest Version | 2024/2025 | Graded A+ **3.1 If farmers plant hedges around their fields, what impact might this have on species diversity around their land?** Planting hedges would likely increase species diversity by providing more habitats and niches, thereby supporting a variety of species and more complex food webs. **3.2 Besides your interrupted belt transect, what additional information should you collect at the survey ...

BTEC Level 3 Applied Science Unit 2 Practical Scientific Proceduresand Techniques Learning Aim A Undertake titration and colorimetryto determine the concentration of solutions.BTEC Level 3 Applied Science Unit 2 Practical Scientific Proceduresand Techniques Learning Aim A Undertake titration and colorimetryto determine the concentration of solutions.BTEC Level 3 Applied Science Unit 2 Practical Scientific Proceduresand Techniques Learning Aim A Undertake titration and colorimetryto determine the...

PAG 5.1, 8.1, 8.3 Questions and Answers | Latest Version | Graded A+ **Question:** What is the procedure for PAG 8.3 (Effect of detergent on plasma membrane permeability)? **Answer:** To conduct PAG 8.3, follow these steps: 1. Prepare a serial dilution starting from a 10% stock solution. 2. Label beakers and test tubes with the corresponding concentrations. 3. Cut beetroot into 30mm pieces. 4. Measure 20cm3 of each concentration using a syringe and fill labeled test tubes. 5. P...

AQA AS BIOLOGY 7401/2 PAPER 2 QUESTION PAPER AND FINAL MARKSHEME JUNE 2022 {MERGED}. Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If yo...

PAG (application) Questions and Answers | Latest Update | Graded A+ **Qualitative testing - emulsion test** **Why does the emulsion test not show false positives for monosaccharides & disaccharides, starch, nucleic acid, and protein?** The emulsion test relies on the solubility properties of lipids in ethanol. Monosaccharides and disaccharides dissolve in water and do not form a precipitate in ethanol. Starch, although it can form an emulsion in water, remains insoluble in ethanol. N...

AQA AS BIOLOGY 7401/2 PAPER 2 QUESTION PAPER AND FINAL MARKSHEME JUNE 2022 {MERGED}. Answer all questions in the spaces provided. box 0 1 . 1 What is a gene? [1 mark] 0 1 . 2 Describe how the production of messenger RNA (mRNA) in a eukaryote cell is different from the production of mRNA in a prokaryote cell. [2 marks] 0 1 . 3 Scientists produced a short, single-stranded, artificial nucleic acid, called PNA. The PNA binds to a small section of DNA. The scientists introduced PNA into cell...

1. Why do we use beetroot cells to measure the effect of different variables on membrane permeability? 2. If a lot of pigment leaks out, what does this tell us about the membrane permeability? 3. If only a little amount of pigment leaks out, what does this tell us about membrane permeability? - ANSWER1. Because beetroot cells contain a coloured pigment (dark red/ purple), that leaks out. 2. High membrane permeability 3. Low membrane permeability State the independent variable, d...

Pro formas of results for checking the calibration of a pipette and balance(s) and calibration of a pH meter. A report on the use of Na2CO3 to standardise HCl, used in turn to standardise NaOH. pH curve from the titration plus a differential plot. Results, calculations and calibration graph for the determination of the concentration of a coloured solution using colorimetry. Explanations of how the accuracy, precision and safety of the quantitative techniques may be optimised. Observation checkli...

Part A of Unit 2, Undertake titration and colorimetry to determine the concentration of solutions (Distinction Level)

BTEC Level 3 Applied Science Unit 2- Practical Scientific Procedures and Techniques Learning Aim A: Undertake colorimetry to determine the concentration of solutions Distinction level