30. At sea level, water at 100°C. (Page 436)

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.

Which of the following best describes technology a. something created for only scientists to use b.the method of thinking that scientists use. c.the application of engineering to create useful products. c. a scientific idea