MediumChemistryHigh School (9–10)GeneralThe Periodic Table › Groups and FamiliesNumerical

Lithium reacts with water: 2 Li + 2 H₂O → 2 LiOH + H₂.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Lithium reacts with water: $2\,\text{Li} + 2\,\text{H}_2\text{O} \rightarrow 2\,\text{LiOH} + \text{H}_2$ . What mass of hydrogen is made by $3.45\ \text{g}$ of lithium? ( $\text{Li} = 6.9\ \text{g/mol}$ , $\text{H}_2 = 2\ \text{g/mol}$ .)

Need a reminder? The key ideaShow

Group 1 metals are soft, have one outer electron and react with water to give hydrogen and an alkali; reactivity rises down the group. Group 2 metals are harder and less reactive. Halogens, group 17, get darker and less reactive down the group, and a more reactive halogen displaces a less reactive one. Noble gases have full shells.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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