Phenol red is a common ph indicator. you add phenol red to an unknown substance and it turns yellow. what does this indicate about the ph of the substance?

How many protons are in nitrogen-15?

What happens to a substance during a physical change?

Which expression represents the concentration of OH - ions in solution? a. [OH-]  10-14 b. 10-14  [H3O+] c. 10-14  [H3O+] d. 10-14 - [H3O+]

Give chemical tests to distinguish between saturated and unsaturated compound

What intermolecular forces occur between two methane molecules?

The complete combustion of gaseous sucrose at a constant pressure absorbs 544 kj of heapt per mole of surcrose. write the balance thermochemical equation for the reaction

Find the acceleration if a car goes from 40 to 50 mph in 5 seconds

What is the percent by mass of nahco3 in a solution containing 10 g of nahco3 dissolved in 400 ml of h2o?

Consider the reaction: 2clf3 (g) + 2nh3 (g) → n2 (g) + 6hf (g) + cl2 (g) when calculating the δh°rxn, why is the δhf° for n2 not important?

12.5 g of copper are reacted with an excess of chlorine gas, and 25.4 g of copper (II) chloride are obtained. Calculate the theoretical yield and the percent yield.