Question

s the biggest factor that causes yields of alum in this experiment to be too, 6. Classify the following properties of aluminum as chemical, intrinsic physical, or extrinsic physical. a. aluminum is shiny b. aluminum reacts with oxygen to form oxides c. aluminum melts at 660°C d. 5.75 cm3 of aluminum has a mass of 15.5 g e. aluminum conducts electricity my aluminum watering can was left outside last winter and had a temperature of 230C when I found it. f. What two effects do impurities have on melting point? 7. nulhing

Answer 1

First let's discuss what are chemical, intrinsic physical and extrinsic physical property.

Chemical property: These are the properties which can be seen after a chemical reaction on the matter.

Example: acidity, toxicity, etc

Intrinsic physical property: These are the physical properties of a matter which does not depend on the quantity of matter.

Example: Density, melting point, boiling point.(because no matter how much amount of any substance you take these property do not change)

Extrinsic physical property: These are the physical properties of a matter which are dependent on the quantity of matter.

Example: Weight, Volume, etc. (because if we take more amount of substance the weight and volume will be more)

6.

a. Aluminium is shiny - Intrinsic Physical

Because, no matter what amount of aluminium we take aluminium will always be a shiny metal.

b. Aluminium reacts with oxygen to form oxides - Chemical property.

Because formation of oxides is the product of chemical reaction of oxygen with the aluminium.

c. Aluminium melts at 660°C - Intrinsic Physical.

Because no matter what amount of aluminium we take the metling point is not going to change.

d. 5.75 cm^{​​​​​3} of aluminium has a mass of 15.5 g - Intrinsic Physical.

Because, 5.75 cm^{​​​​​3} of aluminium has a mass of 15.5 g means this is the density of the aluminium. And density doesnot change with amount of aluminium we take.

e. Aluminium conducts electricity - Intrinsic physical.

Because, no matter what amount of aluminium we take it will conduct electricity.

f. My aluminium watering can was left outside last winter and had a temperature if 23°C when I found it - Intrinsic physical.

Because, no matter what amount of aluminium is used to make that watering can, it will still get cold when it is left outside in winter.

7.

The two effects impurities do have on melting point are,

i. Lowering the melting point:

Impurities decreases the melting point that is, impure matter has lower melting point than pure.

ii. Broadening the range of melting point:

Every matter starts melting at a certain temperature and completely melts at another temperature. These two temperatures are different and this difference is range of melting point. Impurities increases this diffrence in temperatures thereby, broadening the range of melting point.