Water a vital biological molecule
Molecule of water
Water is a substance which is transparent, odourless and colourless liquid that has a boiling temperature of 373K, freezing temperature of 273K meaning it is liquid at room temperature.
Water is a compound containing 2 hydrogen atoms, but also has an oxygen molecule as well this means it has the molecular formula of H2O. The relative atomic mass of water is around 18 with “11.188% being hydrogen and 88.182% being oxygen” [1]. When bonded it forms a covalent bond, “each hydrogen atom shares an electron with the oxygen atom” [2] but these electrons are not held in equilibrium. An oxygen atom attracts the electrons more than the hydrogen atom. This is because of the oxygen being slightly negative (δ-) meaning it has a greater electronegativity than …show more content…
The positive and negative charges attract; this causes the formation of a hydrogen bond. A hydrogen bond is “a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other” [4]. The protons are from the hydrogen and electronegativity of oxygen. A water molecule can bond “up to four other water molecules” [2] this is due to these polar charges. This is attraction between the water molecules is called cohesion.
Due to these hydrogen bonds in water is usually more stable than other hydrides of Group VI which relatively the same as water, for example hydrogen sulphide (H2S). Hydrogen sulphide has the same bent shape as oxygen including the same structure AX2E2. In contrast to water, a boiling point of 373K and liquid at room temperature, hydrogen sulphide has a boiling point of 212.3K meaning that at room temperature it’s a gas. This is because water is more stable due to the hydrogen, which on their own are incredibly weak, but when in a group it is relatively
Molecule of water
Water is a substance which is transparent, odourless and colourless liquid that has a boiling temperature of 373K, freezing temperature of 273K meaning it is liquid at room temperature.
Water is a compound containing 2 hydrogen atoms, but also has an oxygen molecule as well this means it has the molecular formula of H2O. The relative atomic mass of water is around 18 with “11.188% being hydrogen and 88.182% being oxygen” [1]. When bonded it forms a covalent bond, “each hydrogen atom shares an electron with the oxygen atom” [2] but these electrons are not held in equilibrium. An oxygen atom attracts the electrons more than the hydrogen atom. This is because of the oxygen being slightly negative (δ-) meaning it has a greater electronegativity than …show more content…
The positive and negative charges attract; this causes the formation of a hydrogen bond. A hydrogen bond is “a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other” [4]. The protons are from the hydrogen and electronegativity of oxygen. A water molecule can bond “up to four other water molecules” [2] this is due to these polar charges. This is attraction between the water molecules is called cohesion.
Due to these hydrogen bonds in water is usually more stable than other hydrides of Group VI which relatively the same as water, for example hydrogen sulphide (H2S). Hydrogen sulphide has the same bent shape as oxygen including the same structure AX2E2. In contrast to water, a boiling point of 373K and liquid at room temperature, hydrogen sulphide has a boiling point of 212.3K meaning that at room temperature it’s a gas. This is because water is more stable due to the hydrogen, which on their own are incredibly weak, but when in a group it is relatively