Answer:
900 K
Explanation:
Recall the ideal gas law: 

Because only pressure and temperature is changing, we can rearrange the equation as follows: 

The right-hand side stays constant. Therefore: 

The can explodes at a pressure of 90 atm. The current temperature and pressure is 300 K and 30 atm, respectively. 
Substitute and solve for <em>T</em>₂: 

Hence, the temperature must be reach 900 K. 
 
        
             
        
        
        
For #4 first find the molar mass(M) of copper then use that and the mass (m) n=m/M to find moles(n) using moles and the volumes find the concentration using c=n/V
        
             
        
        
        
Yes it’s a real substance and yes it should be banned because it kills people without warning.It has no taste,smell,and you can’t see it.
        
             
        
        
        
Chemical bonds hold atoms together to form compounds through the sharing of electrons or the transferring of electrons. 
Bio is not my strongest subject, but I am pretty sure that a pyramid of numbers differs from an ecological pyramid because it displays the number of organisms at each trophic level