Thursday, 14 September 2017

Lab activity


 questions
1)  why do we add salt to the ice?
-  To make the ice cooler, by sucking heat from ice and milk then the ice will cooler, the milk will freeze.
2)   why do we add the cookies and other things, only after the milk has frozen slightly
-  The cookies and other things may freeze with milk.
3)  what are two factors that affect the freezing you think?
-  Salt and Ice
4)  why do you need a bit of air in the bag?
- If there is much air inside it may pop the bag when we shake.










Wednesday, 14 June 2017

Skill Practice continued

Calculate the density of each of your mineral samples. How could you use the densities to identify the minerals?
   Ans. The density will not change if you calculate density again it will be the same as the first time. 
KeyConcept Would density or color be more useful in identifying a particular mineral? Explain your answer.
   Ans. Density would be more useful to identify a particular mineral because many types of rock have the same color.

Thursday, 1 June 2017

Thursday, 25 May 2017

impact of society on environment

1.Global warming is the rise in temperature of the Earth's atmosphere. This caused melting of ice caps and rising of sea level.
2.Rain acid happens when sulfur dioxide mixed with nitrogen oxides into the atmosphere and react with water. This effect Eart by makes water acidic and cause them to absorb the aluminum.
3.Air pollution is a mixture of solid particles and gases in the air. This effect our health and they cause damage to animals and plants too.