Hello,
Sorry for delaying my post about last class on Friday. But I'll talk about them in one post.
FRIDAY:
We started talking about metals reacting in water and did some exercises. We also did four experiments: reacting calcium powder in cold water, reacting magnesium strip with cold water, reacting calcium powder with hot water & reacting magnesium strip with hot water. The reactions with magnesium were a bit boring, almost nothing happened. But with calcium.... it actually blew up when it reacted. But thinking about this: in a previous experiment Andy didn't give us powdered magnesium because it was dangerous, and now: he gives us powdered calcium which is really more reactive than magnesium. We could accidentally have thrown some in the Bunsen burners (some people maybe not accidentally - not me, I'm not that stupid)!!!!!
Andy?????
Well, let's continue with today's class (MONDAY):
Today we talked about the reactivity series. And Andy, to demonstrate the order in the RS, did some amazing demos: he first reacted calcium with lots of water with universal indicator, it wasn't a very entertaining reaction, but... We still had to see the next ones. Secondly, he reacted sodium with water and universal indicator, wow! it gave lots of hydrogen. But the next one was, without any wonder, the big winner: He reacted potassium with water and universal indicator: it immediately exploded and went on fire, burning all the huge amount of hydrogen which was being produced. With the last one, Andy didn't need to do the hydrogen test, it was already taking place. The universal indicator was added to prove that an alkaline product was given off: the metal hydroxide. That's why these metals and the ones in the same group in the periodic table (group 1) are called: alkaline metals.
Well: that was all.
Don't forget that we need to do at least half a page about properties of the metals in group two (alkaline earth metals).
See you next time.
Sorry for delaying my post about last class on Friday. But I'll talk about them in one post.
FRIDAY:
We started talking about metals reacting in water and did some exercises. We also did four experiments: reacting calcium powder in cold water, reacting magnesium strip with cold water, reacting calcium powder with hot water & reacting magnesium strip with hot water. The reactions with magnesium were a bit boring, almost nothing happened. But with calcium.... it actually blew up when it reacted. But thinking about this: in a previous experiment Andy didn't give us powdered magnesium because it was dangerous, and now: he gives us powdered calcium which is really more reactive than magnesium. We could accidentally have thrown some in the Bunsen burners (some people maybe not accidentally - not me, I'm not that stupid)!!!!!
Andy?????
Well, let's continue with today's class (MONDAY):
Today we talked about the reactivity series. And Andy, to demonstrate the order in the RS, did some amazing demos: he first reacted calcium with lots of water with universal indicator, it wasn't a very entertaining reaction, but... We still had to see the next ones. Secondly, he reacted sodium with water and universal indicator, wow! it gave lots of hydrogen. But the next one was, without any wonder, the big winner: He reacted potassium with water and universal indicator: it immediately exploded and went on fire, burning all the huge amount of hydrogen which was being produced. With the last one, Andy didn't need to do the hydrogen test, it was already taking place. The universal indicator was added to prove that an alkaline product was given off: the metal hydroxide. That's why these metals and the ones in the same group in the periodic table (group 1) are called: alkaline metals.
Well: that was all.
Don't forget that we need to do at least half a page about properties of the metals in group two (alkaline earth metals).
See you next time.
visitors since Andy's 27th Birthday
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