One of mercury's what properties is that it is liquid at room temperature

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.