Answer:
Physical changes
As we know,
Physical changes are those changes which can be reversed and is not permanent. It does not change the chemical nature of the substance....A great example of physical change is given in the question itself, When a substance is melted it can be frozen or cooled back to it's original form, When an object is frozen it can be melted back to its Liquid form, and when an object is in gaseous form like water vapour it can be cooled, and brought back to liquid form....
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Answer:
3.65 g of cyclohexene
Explanation:
Cyclohexanol + phosphoric acid ----> cyclohexene
The reaction is 1:1 hence the limiting reactant is phosphoric acid.
Hence,
1 mole of phosphoric acid yields 1 mole of cyclohexene
0.0444 moles of phosphoric acid yields 0.0444 moles of cyclohexene
Theoretical yield = number of moles of cyclohexene × molar mass of cyclohexene
Theoretical yield = 0.0444 moles of cyclohexene × 82.143 g/mol
Theoretical yield = 3.65 g of cyclohexene
Hydrogen and Oxygen. You need two hydrogen atoms and one oxygen atom to make up H2O
A is the answer.
Ice is solid, however, water is liquid. Yet ice still floats which is less dense than water.
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Answer:
Explanation:
we know that 1 km =1000 m and 1 hour =60 min
therefore
239 km/hr =239*1000m/60 min=3983.3 m/min
