Theory of light and color: Newton separated white light into its colors using a (a triangular geometric figure) and proved that consists of different colors.
• The corpuscular theory: Newton explained that light is made up of called corpuscles,
and they move in a line.
• Newton’s laws of motion: Newton investigated and .
• The theory of gravity: Newton explained that was the mutual of all
matter.

The diagram from Sir Isaac Newton's crucial experiment, 1666-72. A ray of light is divided into its constituent colors by the first prism (left), and the resulting bundle of colred rays is reconstituted into white light by the second. ... The violet is bent more than the yellow and red, so the colors separate.Newton's Corpuscular Theory Statement

According to the Newton's corpuscular theory: Light is made up of tiny particles called 'corpuscles' having negligible mass. These particles (corpuscles) are perfectly elastic. The corpuscles are emitted from the luminous sources such as Sun, candle, electric lamp etc.

I THINK IT HELP 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%

the answer is na (sodium)