All the following are characteristic properties of phosphorus. which one is a chemical property?
(a) when exposed to air, white phos- phorus will burn spontaneously, but red phosphorus will not.
(b) red phosphorus and white phos- phorus are solids.
(c) the white form is soluble in liquid carbon disulfide but is insoluble in water.
(d) the red form of phosphorus is in- soluble in both water and carbon disulfide.
(e) the red form melts at about 600 ◦ c, and the white form melts at44◦ c.

What does the symbol (–hfus) indicate in a phase change?

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]

Draw the lewis structure for the trisulfur s3 molecule. be sure to include all resonance structures that satisfy the octet rule.