combination reactions Flashcards
combination reaction definition
when two elements react to produce and single, more complex compound.
combination reaction general formula
A + B = AB
metal + non-metal =
ionic compound
non-metal + non-metal =
covelant compound
aluminium + iodide observation
two grey powders are added together, and warm water is added. A red/purple smoke is given off and a pink/yellow flame can be seen. There is a grey solid left.
iron + sulfur observation
yellow and grey powders are added together. It is lite on fire and burns with a bright red flame. Grey solid is left.
magnesium + chloride observation
magnesium is lite on fore and added to chlorine. when together they burn with a bright white light.
combinations always need ____ to occur
heat
forming a ionic compound
metal atoms transfer electrons to non-metal atoms to form ions. metal atoms lose valence electrons. non-metal atoms gain valence electrons.
attraction between ions
electrostatic forces
ionic boiling and melting points
have high melting and boiling points. are solid at room temperature.
carbon + oxygen observation
when added together with a flame there is a bright white light.
sulfur + oxygen observation
when sulfur is lite on fire then placed in oxygen there is a bright blue light.
hydrogen + oxygen observation
when a glowing splint enters the test tube a load pop is head. can see water vapor form around the edges.
forming covalent compounds
atoms share electrons to form molecules. valence shell becomes full.
