Which end of a water molecule is positive and which end is negative and why?

Answer:

Comets are composed of ice, dust and frozen gases. The core of the comet is known as nucleus which is formed of rocks and frozen gases. Coma is the atmosphere of the comet. As the comet enters the inner solar system, the coma expands due to sublimation of frozen gases. As it nears the sun, the coma extends backwards and forms a long tail. It extends backwards due to the solar wind. The charged particles from the sun take away the evaporated material and dust of the comet backwards forming tail.

As a comet approaches the Sun, it starts to heat up. The ice transforms directly from a solid to a vapor, releasing the dust particles embedded inside. Sunlight and the stream of charged particles flowing from the Sun – the solar wind – sweeps the evaporated material and dust back in a long tail.

Answer:

See the explanation below

Explanation:

Both the cup of coffee and drop of coffee have the Same temperature of 95°C.

Although the difference is the cup of coffee has more heat contained in it than the drop of coffee. An explanation is when we heat a cup of coffee it will take more time to Attain in 95°C while the drop of coffee will take less time

Final answer:

The difference between a cup and a drop of tea at the same temperature is largely related to their different quantities, affecting the heat capacity and cooling rate. The cup has a higher heat capacity and cools down slower, while the drop cools down faster.

Explanation:

The difference between a cup of tea at 95°C and a drop of tea at 95°C is primarily a matter of quantity and its implications on heat capacity and cooling rate.

Both the cup and the drop of tea are at the same temperature, 95°C, however, the cup of tea contains a larger quantity or volume of tea. This means the cup of tea has a higher heat capacity.

What this signifies is that it would take more energy to change the temperature of the cup of tea than the drop of tea. Conversely, the drop of tea, having a lower heat capacity, will cool down faster than the cup. The larger volume and surface area of the cup of tea allows it to contain more heat and thus, lose heat slower than a drop.

Learn more about Heat Capacity here:

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Subatomic particles can usually pass undeflected through an atom because the volume of an atom is composed of largely empty space. The correct option is (2).

What are subatomic particles?

Subatomic particles are those particles that are present inside the atoms. They are charged particles. They are electrons, neutrons, and protons. Subatomic particles constitute the atom.

Subatomic particles known as electrons constantly revolve around the atomic nucleus of every atom. These particles are the furthest from the atom's nucleus and are negatively charged in nature.

Protons and neutrons, for example, are subatomic particles that are found in the atom's nucleus. While neutrons don't have any net charge, protons are positively charged particles.

Thus, the correct option is (2) largely empty space.

To learn more about subatomic particles, refer to the link:

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answer: THIS IS CORRECT I TOOK THE TEST D: BOTH A AND C

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Answer : The initial temperature of gas would be, 269.7 K

Explanation :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

where,

= initial pressure of gas = 0.723 atm

= final pressure of gas = 0.612 atm

= initial volume of gas = 13.5 L

= final volume of gas = 17.8 L

= initial temperature of gas = ?

= final temperature of gas =

Now put all the given values in the above equation, we get:

Thus, the initial temperature of gas would be, 269.7 K