In a typical double displacement reaction, you would have a total of two products (AB + CD —> AD + BC).
        
             
        
        
        
False
Explanation:
Electron affinity is negative when energy is absorbed and it is positive when energy is released. 
Electron affinity is defined as the energy released in adding an electron to a neutral atom in the gas phase. 
It is a measure of the readiness of an atom to gain an electron. 
In a reaction where energy is released, electron affinity is usually positive. These reactions are called exothermic reactions.
Endothermic reactions in which energy is absorbed have negative electron affinity values. 
Learn more: 
Endothermic reactions brainly.com/question/12964401
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I forgot what quantum means to be honest, the Bohr model In atomic physics, the Bohr model or Rutherford–Bohr model, presented by Niels Bohr and Ernest Rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity. After the cubical model (1902), the plum pudding model (1904), the Saturnian model (1904), and the Rutherford model (1911) came the Rutherford–Bohr model or just Bohr model for short (1913). The improvement over the 1911 Rutherford model mainly concerned the new quantum physical interpretation.
        
             
        
        
        
The formula for hydrogen-hydrogen is H-H
        
             
        
        
        
Heat from deep within Earth is thought to keep the asthenosphere malleable, lubricating the undersides of Earth's tectonic plates and allowing them to move.