A science class is studying how things change when they are mixed together. Study the data table below.
Results of Mixing Different Substances Together
Mixture Created Color Change Temperature Change Formation of Bubbles
Salt and Water clear
no change no change no change
Acid and Base clear
no change warm to the touch no change
Lemon Juice and Red Cabbage Juice dark purple to pale pink no change no change
Baking Soda and Vinegar clear to white warm to the touch foamy bubbles
Based on the data, which of the following is a valid conclusion?
A.
Mixing baking soda and vinegar only makes a physical change.
B.
Mixing acid and base only makes a physical change.
C.
Mixing lemon juice and red cabbage juice makes a chemical change.
D.
Mixing salt and water makes a chemical change.
Answers: 3
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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 .
Answers: 3
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