1 / 9

When Will Double Displacement Reactions Happen?

When Will Double Displacement Reactions Happen?. Somebody’s got to leave the dance!. Remember how we compared double-displacement reactions to a dance in which the couples switch partners? A double-displacement reaction only occurs if one of the new couples gets to sneak out!.

ishi
Download Presentation

When Will Double Displacement Reactions Happen?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. When Will Double Displacement Reactions Happen?

  2. Somebody’s got to leave the dance! • Remember how we compared double-displacement reactions to a dance in which the couples switch partners? • A double-displacement reaction only occurs if one of the new couples gets to sneak out! We’re outta here!

  3. What’s that mean in chemistry? • The ions that form one of the possible products has to stay together in some way/ • If both products remain dissolved, nothing really happens!

  4. Double-Displacement Reactions • The ions of two ionic compounds exchange places (often in an aqueous solution) to form two new compounds, one of which is: • A precipitate • A gas that bubbles out (effervesces) • A molecular compound, usually water

  5. What does this mean? • When ionic substances dissolve in water, the cations and anions separate. They exist as separate ions surrounded by water. • A reaction happens if something occurs that changes this. • FORMATION OF A PRECIPITATE • FORMATION OF A GAS • FORMATION OF WATER

  6. Formation of a Precipitate • When the cations of one reactant react with the anions of another reactant to form an insoluble or slightly soluble compound. Check the solubility chart: S = soluble I = insoluble = slightly soluble If one of the products is insoluble or slightly soluble, a reaction happens. AgNO3 (aq) + NaCl(aq)  AgCl(s) + NaNO3(aq)

  7. Formation of a Gas • If one of the products is an insoluble gas that bubbles out of the mixture, the reaction happens. FeS(s) + 2HCl (aq)  H2S(g) + FeCl2 (aq)

  8. Formation of Water • If water, a very stable molecular compound, is formed, the reaction happens. HCl (aq) + NaOH(aq)  NaCl(aq) + H2O(l)

  9. Sometimes, nothing happens • If none of the conditions described above happens, the ions remain separated, and there is no reaction. • Remember: A double-displacement happens if the products of ion exchange include one of the following: • Precipitate • Gas • Water

More Related