1.3 Micro macro, phase transitions and temperature changes

• Scheikunde
• Middelbare school
• havo
• Leerjaar 3

Micro - macro, phase transitions and temperature changes

Section 1.3

Chapter 1

Micro (molecules)

Macro (senses)

phet.colorado.edu

Pure substance

Mixture

The odor of a candle

1. Macro
2. Micro

1. Macro
2. Micro

What phase transition do you see here?

1. evaporation
2. solidification
3. condensation
4. melting

What is phase
transition 3 called?

1. evaporation
2. solidification
3. sublimation
4. deposition

Do molecules change during phase transition?

1. Yes
2. No

Mixture or
pure substance?

1. Mixture
2. Pure substance
3. Couldn't say

A mixture has a

1. boiling point
2. boiling range

Temperature scales

• degrees Celsius  (^oC)
• Kelvin (K)
• convert Kelvin to ^oC and vice versa
• 
  

20 degrees Celsius is ....... Kelvin

150 Kelvin is ....... degrees Celsius

pure substance and mixture

• pure substance : one single substance , made up of one type of molecules

• mixture : two of more substances mixed together, made up of different type of substance

examples

pure substance :

sugar, alcohol , destilled water

mixture : medicines, air, tapwater 

finding out if a substance is pure or a mixture

• prefrom this experiment : 

a pure substance has a melting point

a mixture has a melting range

a liquid starts to boil and temeperature slowly rises. This is a .....

1. pure substance
2. mixture

what is shown in the graph?

1. boiling point
2. melting range
3. boiling range
4. melting point

what is shown in the graph?

1. melting range
2. solidifying point
3. solidifying range
4. melting range