Ptolemy believed that earth was at the center of the universe. kepler believed that the sun was at the focus of earth's elliptical orbit. which of these statements best explains why ptolemy and kepler made different observations about the solar system? (2 points) question 28 options: 1) the focus of their study was different. 2) they studied outdated theories and evidences. 3) they could not match the data with the observations. 4) they believed in proposing different theories to strengthen science.

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Listen base your answer to the question on the information below.propane is a fuel that is sold in rigid, pressurized cylinders. most of the propane in a cylinder is liquid, with gas in the space above the liquid level. when propane is released from the cylinder, the propane leaves the cylinder as a gas. propane gas is used as a fuel by mixing it with oxygen in the air and igniting the mixture, as represented by the balanced equation below.c3h8(g) + 5o2(g) → 3co2(g) + 4h2o() + 2219.2 kja small amount of methanethiol, which has a distinct odor, is added to the propane to consumers detect a propane leak. in methanethiol, the odor is caused by the thiol functional group (–sh). methanethiol, ch3sh, has a structure that is very similar to the structure of methanol.what is the correct structural formula for a molecule of methanethiol

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?