27. Denny was playing on a swing as shown in the diagram below.
kinetic & potential
B.
No kinetic energy
no kinetic energy
Which one of the following statements is true when Denny swung from position A to
B and then to C?
(1) The potential energy at A, B and C are the same. X
(2) Potential energy was the highest at A and was lost at B. X
(3) Kinetic energy increased from A to B and again from B to C.
(4) Kinetic energy increased from A to B and decreased from B to C.

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.