No links! pls help :)

1. Name an extensive and intensive property of an object around your home. (name the object)

2. Name a physical and a chemical change that occurs when you toast a marshmallow and make a s'more.

3. If you had a bucket of Legos with all different sizes, shapes, and colors, would that be a homogeneous or heterogeneous mixture? How do you know?​

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

0.09 moles of sodium sulfate in 12 ml of solution

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~