Sound and light are both found as (4), with a variety of (5). The sun, a source of light waves specifically, releases a type of (6). The sun emits invisible (7). It can be found as UVA or UVB types. These lights give off different levels of (8), some of which can be harmful. ANSWER CHOICES: Wavelengths, Waves, Radiation, Ultraviolet light, Electromagnetic wave.

your answers are a,b,,e and f

i hope this

the answer is the first option

explanation:

just googled it m8. not that hard

lol

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%