AP chemistry plsssssssssss help?

Question

we were given a metal today and asked to look for the density of an atom

the metal could be copper or silver or anything

my problem is how to look for the density of an atom

Answer 1

If you don't know the density of your unknown sample, you will need to determine that first.  Density= mass (g)/ volume (ml) for a solid.  To determine mass, simply weigh your sample.  To determine volume, fill a graduated cylinder, generally a 100ml will do, approximately half way with water.  Note the volume of water.  Gently slide your sample into the graduated cylinder with the cylinder tilted and slowly returned to its upright position.  If you just drop it in, you will blow out the bottom of you graduated cylinder.  Now, note the volume.  The difference is the volume of your unknown.  Substitute into the formula to get the density of your unknown.  Now, seek out your friendly CRC Handbook of Chemistry and Physics and look for the densities of the metals you think you may have- it's okay to just look at it and guess what the metal is.  Your text book may also have some information on densities in the appendix.  When your density matches, and it should be really close, you've determined your unknown metal.