Wednesday, 13 September 2017

Milk crystallization_Sai

1)  Why do we add salt to the ice?
ans. because we have to decrease the temperature to make the ice-cream, and salt can decrease the temperature of the ice.

2)  Why do we add the cookies and other things, only after the milk has frozen slightly
ans. It takes longer to make it frozen because there are many ingredient that absorb thermal energy.

3)  What are two factors that affect the freezing you think?
ans. Movement and low temperature

4)  Why do you need a bit of air in the bag?
ans. because it help the milk to move around and make contact with the ice.

How to make milk crystallisation

1) Pour the milk into the bug.

2) Put the bug into the container which is full of ice.

3) Put the salt in the ice.

4) Push the test tube rack up and down and hole the top of the bag until it becomes more solid.

5) Enjoy you ice - cream!!

Thursday, 1 June 2017


mr. gary said it's okay

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).