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Ann [662]
3 years ago
13

What is the density of platinum

Chemistry
2 answers:
Alex Ar [27]3 years ago
6 0

Answer:

21.45 g/cm3

Explanation:

kotegsom [21]3 years ago
3 0

Answer:

21.45 g/cm 3

Explanation:

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Which of the following is an example of Newton’s 2nd Law? A. A bowling ball requires more force to roll than a tennis ball B. Si
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Answer:

The answer is A.

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How does a barometer predict the weather?
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<em>Barometers measure this pressure. ... Changes in the atmosphere, including changes in air pressure, affect the weather. Meteorologists use barometers to predict short-term changes in the weather. A rapid drop in atmospheric pressure means that a low-pressure system is arriving.</em>

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3 years ago
Ethanol (c2h5oh) melts at -114°c. the enthalpy of fusion is 5.02 kj/mol. the specific heats of solid and liquid ethanol are 0.9
maria [59]
You'll want to add three amounts of heat. 

(1) Specific heat of lowering the temperature from -135°C to the melting point -114°C
(2) Latent heat of fusion/melting
(3) Specific heat of elevating the temperature from -114°C to -50°C

(1) E = mCΔT = (25 g)(0.97 J/g·°C)(1 kJ/1000 J)(-114 - -135) = 0.509 kJ
(2) E = mΔH = (25 g)(5.02 kJ/mol)(1 mol/46.07 g ethanol) = 2.724 kJ
(3) E = mCΔT = (25 g)(2.3 J/g·°C)(1 kJ/1000 J)(-50 - -114) = 3.68 kJ

<em>Summing up all energies, the answer is 6.913 kJ.</em>
7 0
3 years ago
Will mark brainliest
poizon [28]

Explanation:

solid, liquids and gases are all made up of atoms and molecules

contrast

solids have a definite shape, liquids takes the shape of the container that contains it while gases do not have a shape

solids move about their mean positions, liquids move more freely while gases move in random motion

solids cannot be easily compressed, liquids can be compressed while gases can be easily compressed

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What is the difference between a carnivore and a herbivore?? ​
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meat-eating carnivores have teeth for tearing and skulls capable of biting with great force, while the plant-eating herbivores have teeth and skulls equipped to grind tough vegetation

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