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.

hloride, what is the mass of calcium in

explanation:

b. examine and describe cells

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.