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Lady_Fox [76]
3 years ago
10

Which of the following would be used to measure the amount of matter in an object?

Chemistry
1 answer:
erik [133]3 years ago
3 0
The answer is Weight
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Describe how water contributes to the fitness of the environment to support life.
andrew11 [14]

Water contributes to the fitness of the environment to support life by acting as a Solvent for molecules to interact Moderate Earth's climate.

Water contributes to the fitness of the environment to support life in several ways :

  • Life on Earth began in water and evolved there for 3 billion years before colonizing the land.
  • Even terrestrial organisms are tied to water.
  • Most cells are surrounded by water.
  • Cells are about 70–95% water.
  • Water is a reactant in many of the chemical reactions of life.
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  • Water stabilizes air temperatures by absorbing heat from warmer air and releasing heat to cooler air.
  • Water can absorb or release relatively large amounts of heat with only a slight change in its own temperature.
  • Water’s high heat of vaporization moderates climate.
  • Much of the sun’s heat absorbed by tropical oceans is used for evaporation of surface water.
  • Water is unusual because it is less dense as a solid than as a cold liquid.
  • Most materials contract as they solidify, but water expands.
  • At temperatures above 4°C, water behaves like other liquids, expanding as it warms and contracting as it cools.
  • Water begins to freeze when its molecules are no longer moving vigorously enough to break their hydrogen bonds.
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6 0
2 years ago
5. What is the molar mass of ethanol (C2H5OH)?
AVprozaik [17]
<h2>D) 46.07 g/mol</h2>

The molar mass is given by the sum of the atomic masses of the component elements of the substance.

In our case, the substance is ethanol or C₂H₅OH.

A_C=12.011

A_H=1.0079

A_O=15.9994

\mathcal M_{C_2H_5OH} = 2 \times A_C + 6 \times A_H + A_O = 2 \times 12.011 + 6 \times 1.00079+ 15.999 4= 24.022 + 6.0474 + 15.9994= 46.069≈ \boxed{46.07 \dfrac{g}{mol}}

5 0
3 years ago
How many valence electrons does K+ have
Lera25 [3.4K]

Answer:

About one valence electron

Explanation:

Obviously, removing that electron gives us [Ar] (same configuration as K1+), which is a noble gas and has 8 electrons. Valence electrons are generally regarded as being 'the outermost electrons' for a given atom. Therefore, with neutral potassium, there is one valence electron

5 0
3 years ago
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What happens when energy is transferred through a wave?
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In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels.

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Explanation:

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