The half-life of radon-222 is 3.8 days. Calculate how long a 48g sample of radon will last before it contains only 3g of radon and stops being effective (2 marks)

0.09 moles of sodium sulfate in 12 ml of solution

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?

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