The material which is used as source for commercial production aluminum is bauxite. 
The aluminum can be extracted from bauxite ore by the process of Bayer process. 
In the Bayer process, bauxite ore is heated in the pressure vessel along with a caustic soda solution (sodium hydroxide) at a temperature between 150 to 200 °C. At this temperatures, the aluminium is dissolved in the solution as sodium aluminate in the extraction process. After separation of the residue by filtering, when the liquid is cooled gibbsite is precipitated and then it is seeded with fine-grained aluminum hydroxide crystals from previous extractions. The precipitation take 7-19 days without the addition of seed crystals.
This extraction process converts the aluminium oxide to soluble sodium aluminate, NaAlO2, which afterward converted into aluminum hydroxide and then into aluminum oxide.
Thus, we concluded that the material which is used as source for commercial production aluminum is bauxite ore. 
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Answer:
The answer is "Option B"
Explanation:
From the query, the following knowledge is derived:  
Yield in percentage = 47%  
Performance of theory = 4860 g  
Actual yield Rate =?  
The percentage return is defined simply by the ratio between both the real return as well as the conceptual return multiplied by the 100. It's also represented as numerically: 
 
Now We can obtain the percent yield as followed using the above formula:  
 

The value of the Actual yield Rate =
                                                         
The Actual yield Rate= 2284.2 g.
 
        
             
        
        
        
Answer:
We have the final answer as

Explanation:
To find the energy of a photon of this light we use the formula
<h3>E = hf</h3>
where
E is the energy
f is the frequency
h is the Planck's constant which is 
6.626 × 10-³⁴ Js
From the question
f = 7.08×10¹⁴ Hz
We have
E = 7.08×10¹⁴ × 6.626 × 10-³⁴
We have the final answer as

Hope this helps you