I think this the the list of choices relating to the above question.
reaction rate 
<span>activation energy </span>
<span>collision theory </span>
<span>spontaneous reaction
</span>
The term that best relate to ben's observation is REACTION RATE.
Reaction rate is defined as the speed at which the chemical reaction proceeds. It either is the amount of concentration of a product in a given unit of time or the concentration of the reactant that is being consumed in a unit of time.
        
                    
             
        
        
        
Lithium 6 would have 6 valence electrons in the outer orbital, while lithium 7 would have 7 in the outer orbital. 
        
             
        
        
        
Answer:
Heat flows from the block at high temperature to the one with lower temperature
Explanation:
The direction of heat flow is from a body at higher temperature to one with a lower temperature. 
- Temperature gradient determines the way and manner in which heat is dissipated. 
- As a system tend to increase entropy, it ensures that heat moves from hotter body to a colder body. 
- Heat movement here is by conduction as the body touches. 
- When both bodies reaches the same temperature, thermal equilibrium is established.