Answer:
<h2>All of the above</h2>
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
Explanation:
Hope it is helpful.....
 
        
             
        
        
        
Answer=4
<span>oxidation and reduction reactions
</span>
        
                    
             
        
        
        
If you have a magnesium for every oxygen, then you have to start with two magnesiums. So the balanced equation is 2 Mg + O2 2 MgO.
And 
CaCO3———→CaO + CO2 
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Answer:

Explanation:
The first step is the <u>calculation of the moles</u> of  and
 and  , so:
, so:


Now, in 1 mol of CO2 we have 1  mol of C and in 1 mol of  we have 1 mol of H. Additionally, if we want to calculate the moles of oxygen we need to <u>calculate the grams of C and O</u> and then do the <u>substraction</u> form the initial amount, so:
 we have 1 mol of H. Additionally, if we want to calculate the moles of oxygen we need to <u>calculate the grams of C and O</u> and then do the <u>substraction</u> form the initial amount, so:
 
 


Now we can <u>convert the grams</u> of O to moles, so:

The next step is to divide all the mol values by the <u>smallest one</u>:



Therefore the formula is 
 
        
             
        
        
        
I think the correct answer from the choices listed above is option A. A refracting telescope is made smaller than a reflecting telescope because small lenses cause less distortion in images than big lenses. <span> They are not subject to chromatic aberration because reflected light does not disperse according to wavelength.</span>