When a covalent or an ionic bond is formed a chemical change has occurred. which of these is not associated with a chemical change? a. the atoms of the substances produced have been rearranged. b. the substances produced are identical to the substances that reacted except that they're isomers. c. the total mass of the reacting substances is the same as the total mass of the substances produced by the reaction. d. the chemical properties of the substances produced by the reaction are different from those of the reacting substances.

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius

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]

What is the chemical formula for dihydrogen monoxide