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.
Income Tax Records. The Internal Revenue Service requires companies to keep business tax returns and supporting documents for a minimum of three years from the time of filing. During this time, the return can be amended or audited.If you failed to report income, however, the IRS can come after your business for up to six years.If the business took a deduction for a worthless security or bad debt, the IRS can pursue the issue for seven years. To be safe, a business should keep tax records in its permanent files.f you failed to report income, however, the IRS can come after your business for up to six years. If the business took a deduction for a worthless security or bad debt, the IRS can pursue the issue for seven years. To be safe, a business should keep tax records in its permanent files.