Which of the changes are chemical changes?
a. sugar is dissolved in water.
b. a warm soda bottle fizzes when opened.
c. the copper roof turns green over time.
d. baking soda is dissolved in vinegar and bubbles form.
e. a fog appears on the windshield in cold weather.

If a solution had a ph of 7 what is the solution

Light waves can move through , but they travel fastest when they move through a(n) .

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]