An atom that has 13  protons and 15  neutrons  is isotope  of Aluminium (answer C)
 <u><em>Explanation</em></u>
- Isotope  is a form of the same element with   the equal number of protons but difference number  of neutrons  in  their nuclei.
- In other words isotope has the same  atomic number but different mass  number.
- Atomic  number of a element is determined by number of  protons of an element.
- from the  periodic table   Aluminum  in atomic number 13 therefore  it has 13 protons  <em>therefore an atom that  has 13  protons and 15 neutrons is   a isotope  of Aluminium. </em>
 
        
                    
             
        
        
        
In eukaryotic cells the citric acid cycle takes place in the matrix of the mitochondria.
        
             
        
        
        
Answer:
The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode
 
        
             
        
        
        
Answer:
 I want to say option C: Testing which surfa e is easier to slide a wooden block across. 
Explanation:
I'm not 100 % sure though with my answer. I'm truly so very sorry if my answer is wrong. I tried my best.
 
        
             
        
        
        
Explanation:
Carbon monoxide and hydrogen gas reacts together to form methanol:
CO + 2H2 => CH3OH
Since 0.266mol * 2 = 0.532mol > 0.524mol, the limiting reactant here is hydrogen and therefore there will be 0.524mol / 2 = 0.262mol of methanol.