Education

Metal and Water Reactions

by Revision Monkey

📚 Main topics

Reactions with waterMetals react with water to produce a metal hydroxide and hydrogen gas. Examples include sodium, calcium, and potassium reacting with water. 0:04
Balancing equationsThe video shows the symbol equations for these reactions, including the numbers needed to balance them. 0:37
Comparing reactivityMore reactive metals produce hydrogen more quickly and react more vigorously. Observing the amount of fizzing can help compare their reactivity. 2:11

✨ Key takeaways

Ranking metalsFrom less to more reactive, the metals discussed are gold, silver, copper, lead, iron, zinc, magnesium, calcium, lithium, sodium, and potassium. 2:43
Using observationsThe rate of hydrogen production and the amount of fizzing can be used to rank metals by reactivity. 2:11

🧠 Lessons learned

Writing equationsUse chemical symbols and formulas, then balance the equation with numbers in front of the formulas. 0:37
Applying reactivity trendsA more vigorous reaction with water indicates a more reactive metal. 2:11

🏁 Conclusion/next steps

Revision resourcesThe video invites viewers to subscribe and points teachers to additional Key Stage 3 resources. 3:15

Transcript excerpt

0:04 when a metal reacts with water it produces a metal hydroxide plus hydrogen so this is the general equation here is an example when sodium reacts with water it will produce sodium hydroxide plus hydrogen gas and here is the symbol equation and we can use the periodic table to help us get some of these symbols so sodium is an element on the periodic table with the symbol capital n lowercase a

0:37 water has the formula h2o for sodium hydroxide we take the sodium which is from the metal and the ending hydroxide is oh plus hydrogen which always goes around as a pair so we write that as h2 and these numbers here are just used to balance the equation so the symbol equation is 2na plus 2h2o would make 2naoh

1:08 plus h2 in a second example if we reacted calcium with water we would make calcium hydroxide plus hydrogen and the symbol equation would be ca plus 2h2o would make ca oh2 plus h2 so here's one for you to try and complete and for the symbol equation you can use the periodic table to help you you might want to pause the video now whilst you have a go at this very well done if you wrote the

1:39 potassium plus water would make potassium hydroxide plus hydrogen and the symbol equation would be 2k plus 2h2o would make 2koh plus h2 so when we react a metal with water you can see the hydrogen gas being released

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