Answer: A) Storing experimental samples
Explanation:
 It is a common piece of laboratory glassware that can be made of glass or plastic and is opened at the top and closed at the bottom.
 It cannot be used for measurements because there is no graduation indicating the volume.
 Althought it can contain extra chemicals left over from an experiment, it is not the main proposal of the glassware that is to store samples.
 It cannot be used in a microscope and the object for that is a microscope slide.
 
        
             
        
        
        
Its okay my friend. you dont need to over stress it.
        
                    
             
        
        
        
I believe the answer is D.
Scientists are biased, and want to prove their specific hypothesis is right.
        
                    
             
        
        
        
Answer:
a)  is the mass of 1 mole of bricks.
 is the mass of 1 mole of bricks.
b)  moles of bricks have a mass equal to the mass of the Earth.
 moles of bricks have a mass equal to the mass of the Earth.
Explanation:
a) Mass of brick = 4.0 kg
1 mole =  particles/ atoms/molecules
 particles/ atoms/molecules
Mass of  bricks :
 bricks :

 is the mass of 1 mole of bricks.
 is the mass of 1 mole of bricks.
b)
Mass of the Earth = M = 
Mass of 1 mole of brick = m=
Let the moles of brick with equal mass of the Earth be x.


 moles of bricks have a mass equal to the mass of the Earth.
 moles of bricks have a mass equal to the mass of the Earth.
 
        
             
        
        
        
Answer:
i think it's 3 because there aren't any indexes so that leaves us with one atom of Ca, one atom of O, and one atom of H