Procedure. 1  Start with a short lecture on the nature of solid, liquid, and gaseous water. 2  Your goal is to give some understanding that water molecules themselves don't change when the state of the matter changes, but that the interaction between molecules changes.
Check out our guide of what to toss when. Is your important paperwork piling up? Check out our easy-to-use chart to see what to keep, what to toss, and how to store those hard-to-replace documents. Keep tax returns, as well as supporting documents like W-2 forms, receipts, and real estate closing statements for seven years.
One month. Keep until you get the next statement showing that you paid, unless you need it for tax purposes. Receipts. One month, for purchases such as groceries and restaurant meals, until you match them with your credit card or bank statement.For expensive purchases (jewelry, furniture, appliances), staple the receipt to the owner's manual and keep it as long as you own the item.nce you've purged, separate must-keep papers into three categories: those you need to keep for one calendar year, those you need to keep for a longer period and hard-to-replace documents like birth and marriage certificates. (See chart: What records to keep, how long to keep them .) Then decide on a home for each.