Write the formula of calcium oxide

Iwll give extra points to who gets this for ! what type of reaction is this? ?

One nanometer is equal to how many meters?

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon