Compare the de Broglie wavelength of a bullet moving at 700 miles per hour (313 m/s) to that of an electron moving at 1.30×107 miles per hour (5.81×106 m/s) and a baseball with a speed of 90.0 miles per hour (40.2 m/s) .

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

the correct answer is:

a. formation of precipitation