Acid-base related chemistry
Since this sounds like a homework question, I will not provide a full solution!
Is $\ce{SiO2}$ an oxidizing or reducing agent in the reaction?
Figure out the oxidation state for the $\ce{Ca}$ and $\ce{Si}$ in the starting materials and the product. As a rule of thumb, consider the oxidation state of (-2) for $\ce{O}$. Unless peroxides are concerned, this works well.

 $$\ce{Ca^{(+2)}O + Si^{(+4)}O2 -&gt; Ca^{(+2)}Si^{(+4)}O3}$$
 Apparently, there is no change - this is not a redox reaction!

Is $\ce{SiO2}$ a basic or an acidic oxide?

How are basic and acidic oxides defined?
Are there any rules (of thumb) for the oxides of metals and non-metals?


 Metal oxides are usually basic oxides. These can be considered anhydrides of the corresponding metal hydroxides, $\ce{CaO}$ is a typical example: $\ce{CaO + H2O -&gt; Ca(OH)2}$
 What about $\ce{SiO2}$?