Answer:oxygen
Explanation:
Answer:
In chemistry, the molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance. The base SI unit for molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.
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density is mass over volume
find the mass of the water and then divide it by the volume (25)
The density of heavy water at 20 degrees Celsius can be calculated as the mass of the water divided by its volume, which in this case is 1.105 g/ml.
To determine the density of the heavywater, we need to consider the mass of the water and the volume it occupies. The mass of the water can be calculated by subtracting the mass of the beaker from the final mass. That is 64.859 g (final mass) - 37.234 g (beaker mass) = 27.625 g (mass of water). The volume of the water is given as 25.00 ml. Since the density of a substance is defined as its mass per unit volume, we can calculate the density as mass / volume = 27.625 g / 25.00 ml = 1.105 g/ml. Therefore, the density of the heavy water at 20 degrees Celsius is 1.105 g/ml.
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(C)all of the water on the Earth
(D) all of the fresh water on the Earth
This is on study island
Hydrosphere consists of the total water content in a planet. Thus all forms of water in earth including surface water and frozen water compose the hydrosphere. Therefore, option C is correct.
The entire amount of water on a planet is known as the hydrosphere. Water that is present on the planet's surface, beneath, and in the atmosphere all belong to the hydrosphere. The hydrosphere of a planet can exist as liquid, vapor, or ice.
Oceans, lakes, and rivers are the surface forms of liquid water on Earth. In wells and aquifers, it can also be found underground as groundwater. As clouds and fog, water vapor is most easily seen.
Ice makes up glaciers, ice caps, and icebergs, which make up the frozen portion of the Earth's hydrosphere. The cryosphere is the name given to the portion of the hydrosphere that is frozen.
Within the hydrosphere, water circulates in a cycle. Clouds contain water that eventually falls to Earth as rain or snow. This water accumulates in lakes and oceans. It i s called water cycle.
To find more on water cycle, refer here:
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Answer:
(C)all of the water on the Earth
Explanation:
The hydrosphere consists of all the water found on earth. The hydrosphere include water found in the cloud, fresh water bodies and salt water bodies.
The hydrosphere is interlinked via the water cycle. Water leaves the earth surface to the cloud, condenses and falls again to the earth the ground.
The water cycle shows the free flow of water within the hydrosphere.
The number of electrons that can be held in the second orbital (closest to the nucleus) is 8 electrons
The arrangementof electrons in various energy levels or orbital follows a well defined order. This can be determined by using the following formula:
Number of electrons = 2n²
Where
Now, we shall obtain the number of electrons in the second orbital. Details below:
Number of electrons = 2n²
= 2 × 2²
= 2 × 4
= 8 electrons
Thus, the number of electrons in the second orbital is 8 electrons
Learn more about number electrons in energy levels:
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