Wednesday, 13 September 2017

Crystallization of milk



Crystallization of milk


Procedure:

Step 1: We pour the milk into the zip lock, close it and put it in the container.



Step 2: Put the ice on its zip lock, and then pour the salt on the zip lock.


Step 3: Shake the test tube rack by push and pull it.


Step 4: After shake it, the milk will be freeze and you can eat it! In addition, you can add some topping if you like it.


Result: It is very delicious!




Questions

1)  why do we add salt to the ice?
Answer: It destroys water's bond so the temperature drops down faster.

2)   why do we add the cookies and other things, only after the milk has frozen slightly
Answer: Because some topping is heat capacity so it will slow down the process.

3)  what are two factors that affect the freezing you think?
Answer: Movement and temperature.

4)  why do you need a bit of air in the bag?
Answer: For the milk to move around to make contact with the ice.




Thursday, 1 June 2017

A density









7. Calculate the density of each of your mineral sample. How could you use the densities to identify the minerals?
Ans: Yes because if density is the same, it will be the same type of mineral.

key concept would density or color be more useful in identifying a particular mineral? Explain your answer.
Ans: Color is useful because a color is easily observed, but not always a reliable characteristic for the identification of minerals. 
         Density is useful because Each mineral has a characteristic density (density does not vary with the size of the mineral). 



Wednesday, 24 May 2017

writing assignment

Acid rain


Acid rain effect on the environment so it has a lot of effects but today I will tell you some parts. It can be harmful to fish and other wildlife. As it flows through the soil, acidic rainwater can leach aluminum from soil clay particles and then flow into streams and lakes. The more acid that is introduced into the ecosystem, the more aluminum is released.