Answer:
c
Explanation:
I think that's the answer 
 
        
             
        
        
        
Equal. Good luck with other questions!
        
             
        
        
        
Answer: With the exception of hydrogen, all atoms have three main parts. The parts of an atom are protons, electrons, and neutrons. A proton is positively charged and is located in the center or nucleus of the atom. Electrons are negatively charged and are located in rings or orbits spinning around the nucleus.
Explanation:
 
        
             
        
        
        
Answer:
1.395J/g°C 
Explanation:
The following were obtained from the question:
Q = 6527J
M = 312g
ΔT = 15°C
C =? 
Q = MCΔT
C = Q/MΔT
C = 6527/(312 x 15)
C = 1.395J/g°C
The specific heat capacity of the substance is 1.395J/g°C 
 
        
             
        
        
        
  The half  life  of uranium- 238  is
  4.46 x10^9  years
  Explanation
 Half life  is the time  taken for  the  radioactivity  of   a isotope  to fall  to half  its  original  value.
The  original   mass  of uranium-238  is  4.0 mg
   Half  of original  mass of uranium  = 4.0  mg /2 = 2.0  mg
since  it  take 4.46  x 10^ 9 years  for  the sample   to half  the half life of uranium -238 = 4.46 x10^9 years