Chem Lab

posted by Help1001

Am I right?

Classify the following properties of sodium metal as physical or chemical:
•Silver metallic color—physical property
•Turns gray in air—physical property
•Melts at 98º C-melting point is physical property
•Reacts explosively with chlorine gas—chemical property

Classify the following changes as physical or chemical:
•Water freezes at 0º C –physical change
•Baking soda when combined with vinegar produces bubbles—chemical change
•Mothballs gradually disappear at room temperature—physical change
•Ice cubes in a freezer get smaller with time—physical change
•Baking soda loses mass as it is heated-physical change
•Tarnishing of silver—chemical change

  1. DrBob222

    Na turns gray in air. The gray color is physical, the reaction of Na to the oxide is chemical.

    Baking soda loses weight on heating due to NaHCO3 ==> Na2CO3 + H2O which is a chemical change.

  2. Renee

    sodium metal is insoluble in ether.
    sodium metal dissovles in water to produce a gas.
    Oil dissolves in gasoline and gives a homogeneous solution.
    a drop of silver nitrate solution in a newborn's eye destroys the bacteria that can cause blindness.

  3. Deby

    How would you show that dissolving table salt is a physical change?

  4. loldumb

    find out by urself

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