Aparty shop delivers helium-filled balloons to homes and businesses. the owners realize from experience that on hot summer days they should inflate the balloons only three quarters full. on cold winter days they can fully inflate the balloons. which of the following is the best hypothesis to explain this observation?

a. air outside the balloons leaks into the balloons
b. the helium gas is more active in the winter season
c. as the temperature increases, the helium in the balloons expands.
d. outdoor air pressure in the summer is less than indoor air pressure

What is lincoln's purpose in writing this speech? question 1 options: to stress the difficulties of war to honor those who died in the war to call for an end to the war to call the country to join a new war

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 prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?