1. An atom has an equel number of protons and electrons. Since protons are positive and electrons are negative, they are balanced out and there is no charge.
        
             
        
        
        
Answer:
41 mL
Explanation:
Given data:
Milliliter of HCl required = ?
Molarity of HCl solution = 4.25 M
Mass of CaCO₃ = 8.75 g
Solution:
Chemical equation:
2HCl + CaCO₃      →    CaCl₂ + CO₂ + H₂O
Number of moles of CaCO₃:
Number of moles = mass/molar mass
Number of moles = 8.75 g / 100.1 g/mol
Number of moles = 0.087 g /mol
Now we will compare the moles of  CaCO₃ with HCl.
                       CaCO₃         :          HCl
                           1               :            2
                       0.087           :         2/1×0.087 = 0.174 mol
Volume of HCl:
Molarity = number of moles / volume in L
4.25 M = 0.174 mol / volume in L
Volume in L = 0.174 mol /4.25 M 
Volume in L = 0.041 L
Volume in mL:
 0.041 L×1000 mL/ 1L
41 mL
 
        
             
        
        
        
Answer:
It reads as follows: 0.5 moles of solute per liter of solution.
Explanation:
Molarity is the most frequent way of expressing the concentration of solutions in chemistry, and it indicates the number of moles of solute dissolved per liter of solution; is represented by the letter M.
 
        
             
        
        
        
Answer:
it depends on the mass of the object but sometimes smaller objects have more density the higher the mass the the lower the density
 
        
             
        
        
        
1. Resonance structures are a better description of a Lewis dot structure . 
2. Best resonance structure is the one with the least formal charge. 
<u>EXPLAINATION OF RASONANCE STRUCTURE OF CARBON DIOXIDE</u>
1.Carbon dioxide has three resonance structures .
2. The CO2 molecule has a total of 16 valence electrons , 
   1C = 4 electrons
   2O= 12 electrons 
<u>three resonance structures for  CO2</u>
1. The atoms in all three resonance structures have full octets; 
  structure 1 will be more stable because it has no separation of charge.
2. Structures 2 and 3 show charge separation caused by the presence of formal charges on both oxygen atoms.