1. What type of structure does ozone have? A. Ring Structure
B. Stable Structure
C. Resonance Structure
D. Instable Structure

2. Bond properties differ between covalent bonds of varying lengthe.
A. True
B. False

3. A triple bond is shorter than a double bond.
A. True
B. False

4. Covalent bonds can only exist as O-bonds.
A. True
B. False

question 1 : C

question 2: am not sure

question 3 : A

question 4 : what is O-bonds?

Explanation:

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%

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d