Answer:
It is an amorphous solid and hence also called pseudo solid. So it flows very slowly over thousands of years. It is not visible to the n*ked eye.
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You can see a physical change always but not always a chemical
Answer:
<u>A baseball speeds up as it falls through the air.</u>
<u>A bumper car hit by another car moves off at an angle.</u>
<u>A balloon flies across the room when the air is released.</u>
Explanation:
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Answer:
The molar mass of Pb(Cr2O7)2 is 639.2 g/mol.