Answer:
 4121 years
Explanation:
From;
0.693/t1/2 = 2.303/t log No/N
t1/2= half life of the carbon-14
No= count rate of the living tissue
N= count rate of the sample
t = age of the sample
0.693/5730 =2.303/t log (13.5/8.2)
1.21 * 10^-4 = 2.303/t * 0.2165
1.21 * 10^-4 = 0.4986/t
t = 0.4986/1.21 * 10^-4
t = 4121 years
 
        
             
        
        
        
Explanation:
(a)   The given data is as follows.
               Pressure on top ( ) = 140 bar =
) = 140 bar =  (as 1 bar =
       (as 1 bar =  )
)
               Temperature =  = (15 + 273) K = 288 K
 = (15 + 273) K = 288 K
          Density of gas = 
                  
 
                
                  
 
            
                               = 0.4548
                      
                                  =  
 
                                  = 
Hence, pressure at the natural gas-oil interface is  .
.
(b)   At the bottom of the tank,
                  
                              = 2.206 \times 10^{7} Pa + 700 \times 9.81 \times (6000 - 4700)[/tex]
                              = 
                              = 309.8 bar
Hence, at the bottom of the well at  pressure is 309.8 bar.
 pressure is 309.8 bar.
 
        
             
        
        
        
Answer:
it is a chemical change
Explanation:
it is a chemical change since the lemon juice can not be returned to its original form some part of it had been converted to gas form
 
        
             
        
        
        
Answer:
T2 = 29.79°C
Explanation:
Equliibrium signifies that heat loss = heat gained
Heat gained by Ice;
H = ML
Mass, M = Number of moles * Molar mass = 1 * 18 = 18g
l = 6.01 k J m o l = 334 J/g
C = 4.186 J/g
H =  18(334)
H = 6012
Heat lost by water
H = MCΔT 
H = 18 * 4.186 * (50 - T2)
H = 3767.4 - 75.348T2
Since H = H, we have;
6012 = 3767.4 - 75.348T2
- 75.348T2 = 3767 - 6012
T2 = 2245 / 75.348
T2 = 29.79°C
 
        
             
        
        
        
Answer:
2:a-heterogenous
 b-homogenous
 c-heterogenous
 d-heterogenous with water 
3:Filtration is used to separate insoluble particles from a solution
 Distillation is used to separate liquids with close but different boiling points e.g water and ethanol
Explanation:
2: homogenous mixtures form a uniform layer meaning that a mixture containing more than one layer is heterogenous