What cause the heat we feel on a hot, sunny day is UV Rays my mans
        
             
        
        
        
Comment down below for the answer
        
             
        
        
        
Explanation:
 Calcium is the element that has 2 valence electrons.
 
        
             
        
        
        
Answer:
See figure 1
Explanation:
If we want to find the acid and the Brønsted-Lowry base, we must remember the definition for each of these molecules:
-) Acid: hydrogen donor
-) Base: hydrogen acceptor
In the <u>caffeine structure,</u> we have several atoms of nitrogen. These nitrogen atoms have the ability to <u>accept</u> hydronium ions ( ). Therefore the caffeine molecule will be the base since it can accept
). Therefore the caffeine molecule will be the base since it can accept 
If caffeine is the base, the water must be the acid. So, the water in this reaction donated a hydronium ion.
<u>Thus, caffeine is the base and water the acid. (See figure 1)</u>
 
        
             
        
        
        
Answer:
A formula unit indicates the lowest whole number ratio of ions in an ionic compound. Because the positively and negatively charged ions in an ionic compound are arranged in a crystal lattice, there is no discrete particle comparable to a molecule.
Explanation: