C121 Lab 4 Physical Chemical Properties

Physical and Chemical Properties

Toby Orme-Lab 4

Solubility or Reaction
Substance
Name
Color
Odor
Effect
of Heat
Cold
H2O
Hot
H2O
Litmus
Test
Dilute
HCl
Dilute
NaOH
Mg
Silver
N/A
N/A
Non soluble
Bubbles
Basic
Hot/fizz
N/A
Cu
Copper
N/A
Purple then turned black
Non soluble
N/A
N/A
N/A
N/A
Zn
Silver
N/A
N/A
Non Soluble
N/A
N/A
Vaporized and fizzed
N/A
MgO
White
N/A
Omits gas
Hazy mix
Boiled Rapidly
Basic
Got hot and fizzed
Became thick or pasty
CuCO3
Green
N/A
Turned black
Hazy Green
Became powdery
Basic
Dissolved and vaporized
Turned blue and dissolved
Cu(NO3)2
Blue
N/A
Turned green, became liquid
Dissolved
Boiled rapidly
Acidic
Turned Green
Dissolved
NaCl
White
N/A
N/A
Dissolved
Dissolved
Basic
Dissolved
Dissolved

Questions

Did you observe any chemical changes in this experiment?

I saw many chemical changes, but the most obvious and probably the best example is the mixing of acidic substances and basic substances, to change break the orginal bond in order to create a new one.

What evidence did you use to decide that something was a chemical change?
As I mentioned earlier, we combined an acid and a base when mixing multiple solutions, that is the best evidence available.

Give at least two examples of chemical changes you observed.
1. Diluting MgO with HCl
2. Diltuing NaCl with HCl
Classify the following properties of sodium metal as physical or chemical:

• Silver metallic color: Physical
• Turns gray in air: Physical
• Melts at 98oC: Chemical
• Reacts explosively with chlorine gas: Chemical

Classify the following changes as physical or chemical:

• Water freezes at 0oC: Chemical
• 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
• Baking soda loses mass as it is heated: