changes of states are physical changes

dear, pepito

yesterday in science the teacher talk about meltiling,freezing,evaporation,sublimation,boiling and condesation.

he say that melting is the process by which a solid becomes a liquid.

freezing  is the process by which a liquid becomes a solid

evaporation is a process by which liquid becomes a gas.

boiling is another process by which a liquid becomes a gas

condesation is the process by which a gas changes its state to become a liquid .

and the last but important is

sublimation is the process by which a substance changes directly from its solid state to its gas state without becoming a liquid first.

thats all we talk in the class.  in the donw part i give you some picture

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

matter has observable properties

 

 

latest news

in the last two days, we asked to the people about properties of matter and this is these is what the people say:

what is physical properties?

is the characteristics of a substance that can be observed without changing the identify of the substance.

for example:

ann ice cube has solid state,

 water has liquid state 

 the air has gas state.

what is physical changes?

a change in a substance that does not change the substance into a different one.

for example:

1)ice melting

2)clay being modeled into a new shape

3)butter melting on toast

4)juice box in freezer freezes

5)paper is cut in half

6)rubbing alcohol evaporates on your hand

7)water evaporates from the surface of the ocean

8)a soda can is crushed

9)a glass bottle is broken

10)a beach ball deflates

what is chemical properties?

ia a characteristic of a substance that descrribes how it can form a new substance

for example:

1. combustibility

 

1. flammability

 

1.  Rusting and reactivity.

 

 

what is chemical changes?

is a change of a substance into another substance.

for exanmple:

1.rusting of iron
2.exploding of dynamite
3.digestion of food
4.moldy chesse