Group 1A and 2A Reactions - Video Tutorials & Practice Problems
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1
concept
Reaction with H2O
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1m
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Here, we're going to say that alkaline metals, the elements in group one A and alkaline earth metals from group two A undergo numerous reactions. Now, the two types of reactions that we're gonna pay attention to are those that have them reacting with either water or a halogen from group seven A. Now, here we take a look at the reaction with water. We're gonna say both groups react violently with water and have high exothermic. So delta H of hydration now recall when metals react with an acidic proton H two gas is formed. Here, we have an example of a reaction of these metals with water. And in particular, we're looking at group one A now with group one A, we're gonna say that our metal from group one A reacts with water. It's gonna generate H two gas. In addition to this, it will produce our metal ion. And since it's in group one A, it's plus one, if we were in group two A B plus two plus hydroxide ion, and we say that this is a highly exothermic reaction. Remember, exothermic means we're releasing heat. So heat would be a product once we balance this out. We'd have to put a two here here, here and here. And this would represent my balanced equation between the reaction of group one, a metal with water. Now, remember M here could stand in for a group, one, a or a group two, a metal.
2
example
Group 1A and 2A Reactions Example
Video duration:
44s
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Here, it says we need to complete and balance the following reaction. So from group one, A, we have potassium solid reacting with liquid water. Now, from our example that we saw earlier, we know that this will produce H two gas, we know that it would produce two moles of potassium ion aqueous. It would produce two hydroxide ions aqueous plus the generation of heat. It is an exothermic process. So heat would be a product. Now, in addition to this, we'd have a two here and a two here to fill, finish balancing out our reaction. So this would represent our complete and balanced reaction between the reaction between the reacting of potassium solid and liquid water.
3
Problem
Problem
Alkaline earth metals react with certain substances to produce hydrogen gas. Which of the following will result in hydrogen gas formation? Provide a balanced reaction.
a) Beryllium (Be) and O2
b) Barium (Ba) and CO2
c) Calcium (Ca) and H2O
d) Strontium (Sr) and O2
A
Beryllium (Be) and O2 2 Be(s) + O2(g) → 2 BeO(s)
B
Barium (Ba) and CO2 Ba(s) + 2 CO2(g) → BaO(s) + CO(g) + heat
Now, when it comes to the reaction with halogens, we're gonna say both groups one A and two A react with halogens to produce ionic hats. If we take a look here, if M here represents a group one, a metal, it reacts with a diatomic halogen to produce an ionic haid. Remember group one A is plus one in charge halogens are in group seven A. So they're minus one, the numbers are the same. So they just cancel out. So I I our ionic hale is MX. We have to balance this out. There's two halogens here but only one here. So I throw two here. But now I have two metals on the product side. So I would have to put a two here. M could also represent a group two way medal which have a charge of two plus or plus two. They would still react with the halogen which is minus one and create MX two solid as a product. In that case, you get that as a product and you'd still have to balance out your overall reaction if necessary. So just remember group one A and two A metals react with diatomic halogens to produce ionic halts.
5
example
Group 1A and 2A Reactions Example
Video duration:
40s
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Here, it says to complete and balance the following reaction. Here, we have lithium songs reacted with diatomic fluorine gas. So we know here that lithium is in group one A. So it's plus one fluorine in group seven A. So it's minus one as a result, we create lithium fluoride. We still have to balance this reaction. So I put a two here. So both sides have two floorings and I'd have to put it to here so that both sides have two lithiums. This would represent our complete and balanced reaction between lithium fluoride. Well, between lithium solid and fluorine gas into production of lithium fluoride.
6
Problem
Problem
Provide the products from the reaction between strontium and aqueous chlorine.
A
SrCl(s)
B
Sr2Cl3(s)
C
Sr2Cl(s)
D
SrCl2(s)
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