How can I repair a chip in partical board table top?
Go to Home Depot or Lowes, in the counter department, pick up some white SeamFil, a putty knife and both some coarse (80 grit) and some fine (220 grit) sand paper.

Sand out the gouge, apply the SeamFil and use the putty knife to smooth it.

After its dried, sand with the fine grit sand paper.

SeamFil