Radiation is one way in which energy as heat is transferred. Which of the following is the best example of energy transfer by radiation? Warm surface water sinks down into the cool water below.

Warm air warms the ground below it by contact.

Cold deep ocean water rises to the surface and is warmed by contact with surface water.

Rocks sitting in the sunlight become hot to the touch.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.