8. Here's another calorimetry problem to solve: A solid substance with a mass of 200g is at its melting point temperature in a calorimeter. While the substance changes from a solid to a liquid at the same
temperature, the 400g mass of water in the calorimeter goes from an initial temperature of 80°C to a
final temperature of 30°C. (a) How much heat did the water lose while the substance melted? (b)
What is the heat of fusion of the substance that melted?
Your response lhere.

The concept of empiricism states that all rationally accepted knowledge is determined from experience. francis bacon was one of the first scientists to promote this theory. what was it’s impact on society?

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]

Which of the following is not true about the atomic model of substances?