Why did Thomson’s results from experimenting with cathode rays cause a big change in scientific thought about atoms? a) His results gave people a picture of what atoms look like for the first time.
b) His results gave the first clues that atoms could be created and destroyed.
c) His results gave the first experimental evidence that matter is made up of atoms.
d) His results gave the first evidence that atoms were made up of smaller particles.

d) His results gave the first evidence that atoms were made up of smaller particles.

Explanation:

did the same assignment on edge. a week ago! Hope this helps you!

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

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) : )