Question

PLEASE HELP!!

Answer 1

Water (H2O) is a fundamental molecule for all living systems. The H2O molecules are capable of absorbing, storing, and releasing energy.

• Water molecules are also capable of expanding upon freezing, dissolving and transporting materials.

• Water reduces the viscosity and the melting temperature of both organic and inorganic compounds (e.g., rocks).

• Water's polarity is responsible for most of its properties.

• Water is a polar molecule because it has one oxygen (O) atom with a slightly negative charge and two hydrogen (H) atoms with a slightly positive charge.

• In consequence, H2O can also be dissolved in other polar solvents.

• For example, alcohols and carboxylic acids are compounds soluble in water due to the presence of a polar hydroxy or hydroxyl (-OH) group.

• The most important water properties include polarity, cohesion, adhesion, specific heat, evaporative cooling, and surface tension.

• Cohesion refers to the fact that hydrogen bonding holds H2O molecules linked together, whereas adhesion is because hydrogen bonding also holds water molecules with other molecules.

• The cohesion of H2O molecules is capable of creating surface tension.

• Specific heat refers to the amount of energy (in Joules) needed to raise the temperature of H2O molecules by one degree Celsius.

• Water molecules have high specific heat, thereby enabling evaporative cooling to occur.

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Answer 2

The answer is Water

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