Hydrochloric acid, magnesium metal and universal indicator solution are added to a beaker.
Observations were made: A gas was produced, the beaker got hot, the metal dissolved and the color
changed from red (highly acidic) to yellow (slightly acidic). Based on these observation, what do you think happened, and what was responsible for each different observation.

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

What is the name of the enzyme that forms at the start of transcription?