Answer:
Opticians typically have a high school diploma or equivalent and receive some form of on-the-job training. Some opticians enter the occupation with an associate's degree or a certificate from a community college or technical school. About half of the states require opticians to be licensed.
Magnesium oxide is an ionic compound with a very high melting point and which requires a large amount of energy for melting.
<h3>What are ionic compounds?</h3>
Ionic compounds are compounds which are formed between oppositely charged ions which are held together by electrostatic forces of attraction between the oppositely charged ions.
Ionic compounds are formed when metal atoms donate electrons to non-metals atoms to form ions.
Magnesium oxide is an ionic compound.
The nature of bonding is ionic bonding.
It has a crystalline lattice structure.
The forces of attraction is electrostatic forces of attraction.
It has a high melting point of 2,852 °C, and thus requires a large amount of energy go melting to occur.
Therefore, magnesium oxide is an ionic compound which requires a large amount of energy for melting.
Learn more about ionic compounds at: brainly.com/question/11638999
I believe it is D.
Since something with a high temperature has a higher kinetic energy, it would make sense for the energy of the molecules in the ground to increase. This is because the increasing temperature of the ground allows for the molecules to become faster in motion.
Answer : The number of moles of 
are 0.50 moles.
Solution : Given,
Volume solution = 0.25 L
Molarity of solution = 2.00 mole/L
Molarity : It is defined as the number of moles of solute present in one liter of solution.
Formula used :
Now put all the given values in this formula, we get number of moles.
By rearranging the term,
Number of moles of = 0.50 moles
Therefore, 0.50 moles of are there in the solution.
