Today in Add Science class we will do Ice cream by using the ice and salt .Our group will do ice cream chocolate . First we pour milk in the zip lock and let the air out then put it in the basin and put the ice and salt on top and shake about 5-10 minute to make it freeze. And decorate with topping then eat it !

vertual lab



17. Explain how chemical weathering creates caves and sinkholes.
Ans:  chemical weathering dissolves large portions of limestone or other rock on the surface of the Earth to form a landscape called karts. In these areas, the surface rock is pockmarked with holes,caves.

 18. Explain the difference between weathering and erosion.
 Ans: weathering occurs in place whereas erosion involves movement to a new location.

 19. If you were protecting a national park like Khao Yai from erosion, what would you do?
Ans: build the strong barrier wall

 20. What effect to erosion do dams have--such as the Srinakarin dam?
 Ans: The alteration of a river's flow and sediment transport downstream of a dam



lab equipment

Evaporate dish
use to evaporate liquid
 Graduated cylinder
 is used for measuring volumes (amounts) of liquids. 
 Teat tube
storing liquid chemical and for watching reaction

 used for heating and stirring liquids in laboratory.

heat  shield
heat shield is designed to shield a substance from absorbing excessive heat from an outside source by either dissipating, reflecting or simply absorbing the heat.
use to dispense solid ,powder chemical
To be worn when told to do so to protect your eyes. 
Erlenmeyer flask
used for mixing chemical

used to channel liquid or fine-grained substances into containers with a small opening. 
stirring rod
used to mix chemicals and liquids for laboratory purposes.

add math vedio