day 2 week 5

2SCS: 


1. The law of conservation of matter states that matter is neither created nor destroyed in a chemical reaction. 


2. A scientific law is a law that summarizes what has been learned by careful observation of nature. 


3. "Using things up" means that materials are chemically changed, not destroyed. 


4. a. sn- 1, H-1, F- 1 ---> Sn- 1, F- 2, H- 2. This equation is not balanced 
     b. Si- 1, O- 2, C- 1 ---> Si- 1, C- 2, O- 1. This equation is not balanced 
     c. Al- 1, O- 3, H- 6, Cl- 3 ---> Al- 1, Cl- 3, H- 6, O- 3. This equation is balanced 


5. a. 3 
     b. 2
     c. 1  


6. on paper 


7.  on paper


8.  a. Na- 2, S- 1, O- 4, K- 2, Cl- 1 ---> Na- 2, Cl- 1, K- 2, S- 1, O- 4. 
      b. Yes, the equation is balanced


9.  on paper 


10. a. 32 
       b. 48
       c. 100
       d. 58
       e. 243


11. on paper 


12. on paper