A system expands form 192 mL to 955 mL against a constant pressure of 642 Torr. What is the sign of work for the system

Yes she is correct. the answer is completely correct

Compound with sulfer  is bright red 

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

The answer is c.  h+  and oh−  react to form water (h2o). i just took the test and i got it right. hope this !