: Match the terms to their definitions. Write the proper letter in front of each definition. 15. Physical weathering caused by the action of freezing water
A. chemical

16. Physical weathering caused by roots. B. weathering

17. When carbon dioxide and water combine chemically C. root wedging

18. Type of weathering without change in chemical composition D. carbonic acid

19. Type of weathering with a change in chemical composition E. hydration

20. Process in which minerals are dissolved in water F. physical

21. The breaking down of rocks G. fr

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.