3. Calculate the following. Give the answer in correct scientific notation and significant figures. a) 3.95 x 102cm/1.5 x 106cm
b) (3.5 x 102)m (6.45 x 1010m2
c) 4.44 x 107 kg/2.25 x 105 ml
d) (4.50 x 10-2 cm) (3.67 x 10-12 cm)

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

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]