![]() This isn't very soluble in water and a lot of it is formed as a solid. The cloudiness is due to the formation of calcium hydroxide. You can see bubbles of hydrogen being produced. The first bit of video shows quite a large chunk of calcium being dropped into water. ![]() It looks a bit different because calcium is denser than water and so sinks. The reactions of calcium and magnesium with waterĬalcium's reaction with water is similar to lithium's. This also applies to the reaction of calcium with water and to magnesium's very slight reaction with cold water (below). The oxides of these metals all react with water to produce a hydroxide and so that is what you end up with. Note: You may wonder why you get a metal hydroxide formed rather than an oxide. This is the metal hydroxide formed dissolving in the water. If you watch the video again, in the relatively peaceful reactions, you will see a white trail under the metals as they move around. In each case, you get hydrogen produced and a solution of the metal hydroxide. For reasons that will become obvious, you won't usually come across rubidium and caesium in the lab. So, in this bit of video from the Open University they are starting with lithium at the top of the group, and then working down. As you will find later in the course, the reactivity of these metals increases the further down the group you go. If you looked at a copy of the Periodic Table you would find these metals at the top of Group 1. The reactions of potassium, sodium and lithium at the top of the series We will start by looking at the reactions of the metals at the top of the reactivity series. There are a couple of cases like that, and we will talk about them individually. Note: I say "in principle" because sometimes a metal that you might expect to react with water or steam doesn't, or only reacts much more slowly than you might expect. Metals below hydrogen won't be able to react with water in this way. If a metal is above hydrogen in the reactivity series it should, in principle, be able to remove the oxygen from the water to leave hydrogen gas. We haven't so far mentioned the position of hydrogen in the reactivity series, but it is really important for this topic and the next. The position of hydrogen in the reactivity series most reactive This page explores the way the position of a metal in the reactivity series affects its reaction with water or steam. The reactions between metals and water or steam Reactions between metals and water or steam
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |