What happens in the double-slit experiment with electrons if we place a detector behind one of the slits?
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1. we can then predict the precise point at which each electron will strike the screen.
2. we can know which slit each electron passes through, and the pattern on the screen is not affected.
3. we can know which slit each electron passes through, but the pattern on the screen is affected.
4. only half of the interference pattern on the screen will appear.

Avariable that is not being directly tested during an experiment should be

Chromosome 17 is made of over million base pairs.

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 .