Classify the changes involved in the following processes as physical or chemical changes:
1 answer:
Answer:
a) Photosynthesis - chemical change
b) dissolving sugar in water -physical change
c) burning of coal- chemical change
d) melting of wax- Physcial change
e) beating of aluminum to make Almunium foil-Physical change
f) digestion of food- chemical change
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volume of Ni = 25 nL = 25 x 10⁻⁹ L
mol Ni = 25 x 10⁻⁹ L x 1.25 mol/L = 3.125 x 10⁻⁸
mass = mol x Ar Ni
mass = 3.125 x 10⁻⁸ x 59 g/mol
mass = 1.84 x 10⁻⁶ g = 1.84 μg
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