What describes only a physical change during digestion? Answers)
A: Hydrochloric acid in the stomach breaks down proteins
B: Chewing in the mouth breaks food into smaller pieces.
C: Enzymes in saliva start the digestion of starches before food is swallowed
D: Bacteria in the intestines convert dietary fiber into fats.

What is the formula that this ionic compounds could form sr2+p3-o2-

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]

Why do lunar and solar eclipse not happen every month