Answer:A,D
Explanation:
Option a:
Sodium has charge 
Hydroxide has charge 
.
So,sodium hydroxide is balanced.
Option b:
Magnesium has charge 
Two sulphates has a charge of 
.
So,magnesium sulphate is not balanced.
Option c:
Magnesium has charge
Two hydroxides have a charge of 
.
So,magnesium hydroxide is balanced.
Option d:
Sodium has charge
Sulphate has charge 
.
So,sodium sulphate is not balanced.
The correct answer is that it is made of atoms that are covalently bonded together. Hope this helps.
Answer:Velocity, one of the most frequently used tools for evaluating pitchers, represents the maximum speed of a given pitch at any point from its release to the time it crosses home plate.
Explanation:Velocity, one of the most frequently used tools for evaluating pitchers, represents the maximum speed of a given pitch at any point from its release to the time it crosses home plate.
Gases have three characteristic properties: (1) they are easy to compress<span>, (2) they expand to </span>fill<span> their containers, and (3) they occupy far more space than the liquids or solids from which they form. An internal</span>combustion engine<span> provides a good example of the ease with which gases can be compressed.</span>
