Explanation

The potential of pure water is zero.

Standard Electrochemical Potential:

The standard electrode potential of pure water is considered zero because it is the reference point against which other electrode potentials are measured.

Chemical Potential:

In thermodynamics, the chemical potential of pure water in its standard state (typically at 1 atm pressure and 25°C) is taken as a reference and thus has a relative value of zero.

Explanation

Astronomy is the science that deals with stars, planets, moons, and all objects beyond Earth’s atmosphere.

It helps in understanding the origin, evolution, and structure of the universe.

Explanation

Oxygen is the chemical element with the symbol O and atomic number 8.

Oxygen Discoverers: Joseph Priestley, Antoine Lavoisier, Carl Wilhelm Scheele

Oxygen Symbol: O

Oxygen Atomic number: 8

Oxygen Electrons per shell: 2, 6

Explanation

The largest blood vessel in the body is the: Aort

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The blood vessels that supply blood to heart muscles are: Coronary arteries

Blood vessels that carry blood away from the heart toward body tissues are called:  Arteries

The smallest blood vessels are called capillaries.

Explanation

Polythene is a thermoplastic because it softens when heated and can be reshaped.

It is formed by polymerization of ethene molecules.

Explanation

Venus

Eight planets in the solar system

Explanation

Evaporation is the process where liquid turns into gas at temperatures below its boiling point.

It occurs at the surface of the liquid.

It is influenced by factors like temperature and surface area.

Explanation

Venus
Venus is the closest planet to Earth when it's between Earth and the sun.

At this point, Venus is about 24 million miles away from Earth.

This happens every 584 days.
Mercury
Mercury is the closest planet to Earth while Venus is on the opposite side of the sun from Earth.

At this point, Mercury is about 33 million miles away from Earth.

Explanation

Neon is used in decorative lights.

Concept:

The color of the light depends on the gas in the tube.

Neon lights were named for neon, a noble gas that gives off a popular orange light

Explanation

Pneumonia is often caused by Streptococcus pneumoniae.

It is a type of bacteria that leads to lung inflammation and infection.

It affecting breathing and oxygen intake.