Matter

1. MATTER, MASS AND VOLUME

Matter: everything with mass and volume.

Mass: amount of matter in a body. We measure it in grames and kilogrames.

Volume: it´s the amount of space that something occupies. Measure: litres.

Density: it expains why some objects float on water and why others sink. We calculate it by dividing the mass of an object by its volume.
      
D=      mass      
         volume
Example:
Cork: 0,25 Kg/l
Water: 1,00 Kg/l
Iron:  7.90 Kg/l        Which one will float? and sink? Why?

Game about matter, mass and volume:  http://www.e-learningforkids.org/science/lesson/iceland-mass-volume-matter/

Changes in matter: PHYSICAL AND CHEMICAL CHANGES

Physical changes: matter has 3 forms: solid, liquid and gas. A physical change occurs when matter changes shape or state.

Reversible physical change: If we can turn the sustance back to its original form.

Ex: Fusion: change from a solid state to a liquid state. (ice→water)
      Solidification: change from liquid state to a solid state (freeze)
      Evaporation: change from a liquid state to a gas state
      Condensation: change from a gas state to a liquid state.

                                 

                                                    

Irreversible physical change: We can´t turn the substance back to its original form. Ex: when we break a glass. 

Chemical changes: when a NEW substance is produced.

Examples:

• Combustion: occurs when a material (such as wood) combines with oxygen and burns. The wood/paper transforms into new substances: smoke and ash. 
  
• Oxidation: when a substance in some metals combines with the oxygen in the air and with water→a new substance called "rust" is formed.
  
• Putrefaction: occurs when organic matter decomposes. (bacteria) 

  

  
  Game online: http://www.ecosystemforkids.com/games/4th-grade/physical-and-chemical-changes/activity.html

  
  

  
  

  Summary:
  

  
  

  

  

  

  
  

  VENNAGE: https://infograph.venngage.com/ps/uxBJ1QJxXeM/physical-vs-chemical-changes

  
  

  
  

  
  

  • ACTIVITY: CROSSWORD

  
  

  

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  Suggested activity

  Now it is your turn!

  - Create a mind-map about physical and chemical changes.

  -You can use Go Conqr, it is very easy to do it.
  Press this link to go yo "GO CONQ": https://www.goconqr.com/es/mapas-mentales/