Definition of density in a really simple kid friendly way .

Name the element in group 17, period 2. (periodic table)

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

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