How many moles are in 2.1 x 1024 atoms of arsenic?  

The equation Mg(s)  +  2HCl(aq)  –>  MgCl2(aq)  +   H2(g) is an example of which type of reaction?

When we mixed sodium hydroxide and copper(II) sulfate in lab a couple of weeks ago, there was a pale blue precipitate that formed.  What was the name of it?

What is the molecular formula of a compound that is 40% sulfur and 60% oxygen by weight and has a molar mass of 400 grams? a.  S5O15 b.  SO3 c.  SO2 d.  SO

Match the equation with its type of reaction.  The numbers shown below should be subscripts not coefficients.

Predict the products for the following equation: Na     +      CaCl2    –>        a)   Ca    +     NaCl b)   NaCa      +     Cl c)   Na2Ca      +     Cl2 d)   no reaction

Select the correct formula for sulfur hexafluoride a.  S2F6 b. F6SO3 c.  F6S2 d.  SF6

Select the correct formula for sulfur hexafluoride a.  S2F6 b. F6SO3 c.  F6S2 d.  SF6

Match the equation with its type of reaction.  The numbers shown below should be subscripts not coefficients.

Predict the products for the following equation: Na     +      CaCl2    –>        a)   Ca    +     NaCl b)   NaCa      +     Cl c)   Na2Ca      +     Cl2 d)   no reaction