How do they know the valence of an element if they have never seen it?

How many grams of CO2 are in 2.1 mol of the compound? a) 21.0g c) 66.0g

Give at least two results of too little air being in a running engine.

Which would likely cause more serious burns if you held it in your closed, cupped hands for a few minutes: 100 g of water at 100°c or 100 g of steam at 100°c?

I dentify each element on periodic table elements write the names

Which of the following is NOT a good way to present data a data table a graph a long list of information

What is the volume of 2.00 moles of chlorine (cl2) gas at stp, to the nearest tenth of a liter?

A reaction of 12.640 g of copper oxide with 0.316 g hydrogen produces 2.844 g of water and Xg of copper. X=_9

If i burn steel wool inside a closed jar or bottle will the oxygen be completly gone

700 grams of glucose reacted fully with oxygen How many moles of gas will be created

The uranium used for nuclear fuel exists in nature in several minerals. Calculate how many moles of uranium are in 8.00 moles of the following: 1. carnotite, K2 (UO2) 2 (VO4) 2 • 3H2O 2. uranophane, CaU2Si2O11 • 7H2O 3.