Magnesium oxide is an ionic compound that can be used as a building material. MO2 is actually a raw material that used in producing cement for building houses, buildings, and other constructions.
Many old structures were made of limestones. Limestone is from Calcium Carbonate (CaCO3) which is an ionic compound and can be used as a building material too.
Answer: the first answer is correct
Explanation:
she goes back to a stable feeling
Hello There
Answer: <span>homogeneous mixture (A)
Reason: A</span><span> homogeneous mixture seems to only have one substance, when it actually contains more. An example of one is water. It seems to only have one substance, but it contains minerals and </span><span>gases, but these are dissolved in the water.
I hope this helps
-Chris</span>
Answer:
The power of top half of the lens is 0.55 Diopters.
Explanation:
Since, the person can see an object at a distance between 34 cm and 180 cm away from his eyes. Therefore, 180 cm must be the focal length of the upper part of lens, as the top half of the lens is used to see the distant objects.
The general formula for power of a lens is:
Power = 1/Focal Length in meters
Therefore, for the top half of the lens:
Power = 1/1.8 m
<u>Power = 0.55 Diopters</u>