19. When an atom of iron loses all of its 4s electrons and one of its 3d electrons, what is its charge?

How many significant figures should be written in the sum 4.56 g + 9.032 g + 580.0078 g + 540.439 g? a. 3 b. 4 c. 5 d. 6 e. 7?

The amount of heat energy liberated by a sample of water depends upon its what?

Calculate the molarity of 34.2 grams of sugar c12h22o11 in 300.0 ml of solution

1. A pyrotechnician mixes 280 g of black powder for a firework. Find the amount of oxygen, carbon dioxide, and sulfur dioxide generated when this firework bursts, if the oxidizing agent in the powder is saltpeter. 2.

What can be observed only by observing its effects on gravity?

What are the carbon (C) and oxygen (O) in carbon dioxide (CO2) ? (select all that apply) A) Atoms B) Compounds C) Elements D) Molecules

What does the chemical formula C3H2O, tell about a molecule of the compound it represents?

No two different elements will have the atomic number.-

Which two scenarios illustrate the relationship between pressure and volume as described by Boyle's law? 1. The pressure in a closed bottle decreases when the bottle is squeezed. 2.

0.210 mol of octane is allowed to react with 0.760 mol of oxygen. which is the limiting reactant?