Answer:
Jose and Sarah are running in the cross country meet. Their skeletal and muscular systems work to move them through the course. As they run, they breathe faster and harder and their heart rate increases.
A.work together
Explanation:This should help:)
 
        
             
        
        
        
Answer:
Molar mass of unknown solute is 679 g/mol
Explanation:
Let us assume that the solute is a non-electrolyte.
For a solution with non-electrolyte solute remains dissolved in it - 
Depression in freezing point of solution, 
where, m is molality of solute in solution and  is cryogenoscopic constant of solvent.
 is cryogenoscopic constant of solvent.
Here 
If molar mass of unknown solute is M g/mol then-
                  
So, 
so, M = 679 g/mol
 
        
             
        
        
        
The answer could be a satellite
        
             
        
        
        
Answer:
A. SO4 2−
Explanation:
                            SO₄²⁻
A covalent bond is a bond that forms from sharing of electrons between two atoms. Here, the two atoms combined must have a very low electronegative difference between them, usually 0. Electronegativity deals with the tendency of an atom to attract electrons to itself. 
Oxygen and sulfur shows similar tendencies. Since the two atoms shows a strong affinity for their valence electrons in order to complete the octet. This will lead to the eventual sharing of the valence electrons. 
 
        
                    
             
        
        
        
Answer:
0.2349 moles, 10.3356 g
Explanation:
The given reaction is :

The balanced reaction by equating the same number of each atom both side is :

Given that :
Amount of oxygen gas = 11.9 g
Molar mass of oxygen gas = 32 g/mol
The formula for the calculation of moles is shown below:
 
Thus, moles are:
 
 
From the reaction,  
19 moles of oxygen gas on reaction forms 12 moles of carbon dioxide
Also, 
1 mole of oxygen gas on reaction forms 12/19 moles of carbon dioxide
So,
0.3719 moles of zinc on reaction forms  mole of carbon dioxide
 mole of carbon dioxide
<u>Moles of carbon dioxide formed = 0.2349 moles</u>
Mass of carbon dioxide = moles×Molar mass
Molar mass of carbon dioxide = 44 g/mol
<u>Mass of carbon dioxide formed = 0.2349 ×44 g = 10.3356 g</u>