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.
forces between atoms
intermolecular forces. very strong.
covalent melting and boiling points
low melting and boiling points. most are liquid or gas at room temperature.
