Physcial and Chemical Properties

Physical & Chemical Properties

Data Table 1: Solubility or Reaction
Substance Name
Color
Odor
Effect of Heat
Cold Water
Hot Water
Litmus test
Dilute HCl
Dilute NaOH
Mg
Silver
None
None
None
None
Base
Fizzes, gas, increased temperature
None
Cu
Brown
None
None
None
None
Base
None
None
Zn
Silver
None
None
None
None
Base
Fizzes
None
MgO
White
Slight odor
None
None
Bubbles
Base
Dissolves, turns yellow, increased temperature
None
CuCO3
Green
None
Melts, turned black and Gas
Dissolves
None
Base
Fizzes
Turns blue
Cu(NO3)2
Blue
None
Dissolves and turns green
None
Dissolves, turns green, gas
Acid
Dissolves and turns green
None
NaCl
White
Salty
None
None
Dissolves
Base
Dissolves and turns yellow none QUESTIONS:

A - Did you observe any chemical changes in this experiment?
Yes I observed several chemical changes in the experiment.

B - What evidence did you use to decide that something was a chemical change?
From watching the pre-lab presentation and consulting the book, several key factors to determining a chemical change are if there is a change in color, a change in heat, or an evolution of a gas (by bubbles of fumes).

C - Give at least two examples of chemical changes you observed.
When I added HCl to the Mg, I observed it fizz, turn to gas, and get really hot. Another example is when I added heat to the Cu(NO3)2 it dissolved, turned green and started turning into gas.

D - Classify the following properties of sodium metal as physical or chemical: Silver metallic color – physical Turns gray in air – chemical Melts at 98oC – physical Reacts explosively with chlorine - chemical

E - Classify the following changes as physical or chemical: Water freezes at OoC - physical Baking soda when combined with vinegar produces bubbles:- chemical Mothballs gradually disappear at room temperature – physical Ice cubes in a freezer get smaller with time –physical