You design an experiment to show that the reaction between Alka Seltzer and Vinegar is an endothermic reaction . An alka seltzer tablet is added to a solution of vinegar and the temperature is recorded. Your results show that if you increase the number of Alka Seltzer tablets being added to the vinegar, there is a greater change in temperature. What is the independent variable in your reaction? a. If the reaction is endothermic or exothermic.
b. the temperature of the solution.
c. the vinegar.
d. the number of Alka Seltzer tablets.

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .

What if it is did darwin used to support his theory of evolution