3. How many moles of sodium are needed to react with sulfuric acid to produce 3.75 moles of

sodium sulfate according to the following (unbalanced) reaction:

Na + _ H2 (SO4) = __ Na2 (SO4) + __ Hz

An atom in the excited state can have an electron configuration of

Write the formula for the polyatomic ion of ba3 (po4) 2: express your answer as an ion. express single charges as [+], not [1+]

For which of the following solutions would an increase in pressure result in an increase in solubility of a solute? gas liquid solid gases, liquids and solids

Calcium reacts with hydrochloric acid, HCI, to make calcium chloride and hydrogen gas (H2). 1) write a word equation for this reaction. 2) write a balanced symbol equation for this reaction.

What molecules can be used for long-term energy storage?

Andy has two samples of liquids. Sample A has pH of 4, and sample B has a pH of 6. what can Andy conclude about these two samples? Sample A is a neutral b alkali c acidic Sample B is a neutral b alkali c acidic

How does a lone pair contribute to molecular shape? A. It is too small to affect the molecule's shape. B. It takes up space like an "invisible" atom. C. It forces the molecule into a tetrahedral shape. D. It lets the bonding pairs spread out more.

The are of a rectangle is 12 in^2. what is the area in cm^2. there are 2.54cm in an inch.

Which statements describe advantages of models? Check all that apply. Models make it possible to easily notice patterns. Models can be used to communicate and test design ideas. Models allow scientists to predict relationships.

Are energy levels and orbitals the same thing?