1. If you have 20 grams of parent material and TWO half-lives go by, how much parent material do you have remaining? How much daughter material do you now have?

State two differences between metals and non metals with respect to their 1 physical properties 2 chemical properties

In addition to carbon dioxide what is one of the products of respiration A sugar B oxygen C chlorophyll D energy

What layer in the atmosphere contains the ozone layer

Put the pairs of atoms in order, with the pair that has the biggest electronegativity difference between the two atoms at the top of your list. Phosphorus and lithium Chlorine and cesium Aluminum and oxygen Bromine and bromine Oxygen and strontium

How was a physical change different from a chemical change

Determine the name of the compound Li2O

Complete the reactions to show how butanoic acid may be converted to phenyl propyl ketone.

As a sample of the radioactive isotope 131I decays, its half-life (1) decreases (2) increases (3) remains the same

How many Joules of energy are required to change 10.0 gram of ice at - 2.0 C to water at 20.0 C? (use your constants) 440 J 66,000 J 880 4220 J

Why are Van der Waals forces important? A) They determine how strong dipole moments will be in polar covalent molecules B) They are the strongest type of intermolecular force that can act on polar and non-polar molecules C) They are primary