Explain how chromium and sodium both conduct electricity.
Describe two ways in which the physical properties of chromium and sodium differ.
An alloy containing iron and chromium is stronger than pure iron. Use ideas about the structure of metals to explain why the alloy is stronger.
Molten chromium reacts with steam to make chromium(III) oxide, $\text{Cr}_2\text{O}_3$, and hydrogen. Construct the equation for this reaction.
A structure of a chromium-containing ion is shown. Write the formula for this ion.
Adding dilute acid to yellow $\text{CrO}_4^{2-}(aq)$ produces orange $\text{Cr}_2\text{O}_7^{2-}(aq)$. Describe and explain what you would see when a few drops of concentrated aqueous sodium hydroxide are added to the orange solution.
Suggest why a change in pressure has no effect on the reaction shown.