(a)
The radius of the sphere is:
r = 12.5 cm
So the volume of the sphere of gold is
The density of gold is
So the mass of the sphere is
(b)
The length of one side of the cube is
L = 0.049 mm = 0.0049 cm
So the volume of the cube of platinum is
The density of platinum is
So the mass of the cube is
(c) 53.5 g
The volume of the ethanol is
V = 67.1 mL
While its density is
d = 0.798 g/mL
So the mass of the ethanol is
Evidence of Chemical Change:
A car rusting
Leaves changing in October
The glow of a light bulb
A white cloudy substance occurs after mixing two substances
Burning toasts
A candle being lit
Evidence of Physical Change:
Water boiling
Yellow and blue paints mixed together
Wax melting
Crushing a rock with a hammer
Hope this helps!
Have a great day!
The final volume of the gas is 3 L
Explanation:
We can solve this problem by applying Boyle's law, which states that:
"For a gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume"
Mathematically:
where
P is the pressure of the gas
V is its volume
The equation can also be rewritten as
For the sample of helium in this problem, we have:
Solving the equation, we can find , the final volume of the gas:
Learn more about ideal gases:
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Answer:
b
Explanation:
light does not need a medium
it is refracted
Light is made up of little packets of energy called photons.
electromagnetic waves