PowerPoint Presentation:
Some metals react with acids to give hydrogen gas and an ionic salt: Example: sodium reacts with water to form sodium hydroxide and hydrogen gas The reaction: Na (s) + H2O → Na + (aq) + OH - (aq) + H 2 (g) Potassium, calcium, strontium and lithium react with water, too Sodium reacts with water
PowerPoint Presentation:
Some metals react with acids to give hydrogen gas and an ionic salt: Example: sodium reacts with water to form sodium hydroxide and hydrogen gas The reaction: Na (s) + H2O → Na + (aq) + OH - (aq) + H 2 (g) Potassium, calcium, strontium and lithium react with water, too This skeleton equation, unbalanced, shows what reacts and what is formed.
PowerPoint Presentation:
What happened? The sodium atom gave an electron to the hydrogen and it bubbled off as hydrogen gas The sodium had lost an electron So it got a positive charge The hydrogen left the water That left the hydroxide ion, OH - All the ions are surrounded by water. That’s why we say (a) after them. It stands for “aqueous.” showcase.unis.org/.../MOLEC_knowledge.html
PowerPoint Presentation:
Single replacement Reactions in which one element gives electrons to the ions of another element, like the ones you studied that generated hydrogen, are called single replacement reactions There are two reactants and two products One element becomes an ion and the other ion becomes an element Example: sodium metal becomes sodium ions Hydrogen ions become hydrogen gas
PowerPoint Presentation:
Do other metals react with other ions? Let’s do the experiment Let’s put active metals in contact with solutions of other metallic ions Let’s see if the metallic ions take electrons from the active metals And let’s see if we can find evidence that the active metals are turning into ions