What is the phenol red test? Please explain the testing and its results and the chemistry behind it? Please explain for a beginners level. Thank you

Expiration date or Beyond-Use-Date is based on: Select one: O a. The minimum time period in which 90% or greater of the active ingredient is measurable O b. The maximum time period in which 90% or greater of the active ingredient is measurable OC. The maximum time period in which 10% or greater of the active ingredient is measurable O d. The minimum time period in which 90% or less of the active ingredient is measurable Panill

Answer only, no need explanation! This quiz is already done. I just want to know the right answer lol

Please answer the questions in the grey colored box provided in the image.

INSTRUCTION:  Check which test(s) will yield a positive result for the given compounds.   Biuret Test Ninhydrin Test Hopkin’s Cole Test Xanthoproteic Test Millon’s Test Lead Sulfide Test Albumin             Gelatin             Casein             Tyrosine             Glycine             Ala-Pro             Cys-Leu             His-Gly-Tyr             Gly-Gly-Met             Beef stock

https://www.chemicalsafetyfacts.org/dose-makes-poison-gallery/ This is the link to help out the worksheet. Thank you

How would you prepare a 1:2000 dilution? I need help understanding , thank you

Check which test (s) will yield a positive result or negative result for the given compounds. Sample Biuret Test Ninhydrin test Hopkin's cole test Xanthoproteic test Albumin         Gelatin         Casein         Tyrosine         Glycine         Ala-Gly         Cys-Leu         His-Gly-Tyr         Gly-Gly-Met         Beef Stock

Hi I hope you're doing fine. I need help with this questions please! thank you!

Please help me to find positive or negative results for the Oxidase lab test for microbiology, recognize the species and explain the reason behind the result.