Beatrice Lang
Calcium and hydrogen do not form an electrical attraction with each other. However, calcium hydride, a compound formed by the reaction of calcium with hydrogen gas, is a highly reactive ionic compound. Calcium hydride reacts with water to form hydrogen gas. Hydrogen bonds are a type of intermolecular force that forms a special type of dipole-dipole attraction when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons. Water molecules are polar, with one slightly negative side (oxygen) and one slightly positive side (hydrogen), allowing them to interact with charged particles like ions.
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What You'll Learn
Calcium hydride's interaction with water
Calcium hydride, or CaH₂, is a chemical compound formed by the combination of calcium and hydrogen gas at high temperatures, typically between 300-400 degrees Celsius. This compound is highly reactive, particularly when it comes into contact with water, due to its ionic properties.
The interaction between calcium hydride and water is a classic and prominent chemical reaction. This reaction is highly exothermic, meaning it releases heat. The balanced chemical equation for this reaction is:
CaH₂ + 2H₂O → Ca(OH)₂ + 2H₂
In this equation, one molecule of calcium hydride reacts with two molecules of water to form one molecule of calcium hydroxide and two molecules of hydrogen gas. The calcium hydride starts the reaction by breaking its bond with the hydride ions, allowing these ions to interact with the hydrogen atoms in the water molecules. This interaction leads to the formation of hydrogen gas, which is released as bubbles during the reaction.
The reactivity of calcium hydride with water makes it valuable in various chemical applications, such as a drying agent for organic solvents. It is also used as a desiccant for basic solvents like amines and pyridine, and for drying alcohols. The compound is also used to produce small quantities of highly pure hydrogen for laboratory experiments.
Now, coming to the initial part of your query, hydrogen does form a special type of electrical attraction with calcium, known as a hydrogen bond. This bond is an intermolecular force (IMF) that occurs when a hydrogen atom bonded to a strongly electronegative atom is in close proximity to another electronegative atom with a lone pair of electrons. In the case of calcium, the Ca²⁺ ion forms when a calcium atom loses two electrons, resulting in a strong positive charge. This positive charge attracts the negatively charged oxygen end of polar water molecules.
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Hydrogen bonding
A hydrogen bond is an intermolecular force (IMF) that forms a special type of dipole-dipole attraction. This occurs when a hydrogen atom bonded to a strongly electronegative atom exists near another electronegative atom with a lone pair of electrons. The hydrogen donor (N, O, or F) is strongly electronegative, pulling the covalently bonded electron pair closer to its nucleus and away from the hydrogen atom. This leaves the hydrogen atom with a partial positive charge, creating a dipole-dipole attraction between the hydrogen atom bonded to the donor and the lone electron pair of the acceptor.
Hydrogen bonds are generally stronger than ordinary dipole-dipole and dispersion forces but weaker than true covalent and ionic bonds. They are constantly broken and reformed in liquid water. Water is an ideal example of hydrogen bonding, as each water molecule can potentially form four hydrogen bonds with surrounding water molecules: two with the hydrogen atoms and two with the oxygen atoms.
Calcium hydride (CaH2) is a chemical compound formed by the reaction of calcium with hydrogen gas at high temperatures. It is a highly reactive ionic compound where calcium gives up electrons to hydrogen, forming hydride ions. When calcium hydride comes into contact with water, it forms calcium hydroxide (Ca(OH)2) and hydrogen gas (H2). This reaction is highly exothermic, releasing heat, and is commonly used when water needs to be eliminated from a chemical environment, such as drying organic solvents.
Water molecules are polar, with one slightly negative side (oxygen) and one slightly positive side (hydrogen). This polarity allows water to interact with charged particles like ions. Calcium ions (Ca2+), formed when a calcium atom loses two electrons, have a strong positive charge and are highly effective at attracting negatively charged particles, such as the oxygen end of polar water molecules. This electrostatic attraction is what holds ionic bonds together and is crucial in various biological and chemical processes, including muscle contraction, signalling, and bone structure formation.
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Calcium's role in biological processes
Calcium is an essential element that plays a crucial role in various biological processes. It is particularly important for skeletal mineralization, with more than 99% of the body's calcium found in bones in the form of hydroxyapatite. This calcium provides skeletal strength and acts as a reservoir that can be released into the serum.
Calcium exists in three forms in the serum: protein-bound, ionized (free), and complexed (chelated). Free calcium, which makes up 51% of serum calcium, is utilized by the body to maintain physiological functions. Calcium homeostasis is maintained by hormones that regulate calcium transport in the gut, kidneys, and bones, including parathyroid hormone (PTH), 1,25-dihydroxyvitamin D-3 (Vitamin D3), and calcitonin. These hormones work to maintain adequate levels of calcium in the body, ensuring it is neither deficient nor toxic.
Calcium ions (Ca2+) are vital for the physiology and biochemistry of organisms' cells. They play a significant role in signal transduction pathways, acting as a second messenger, and are involved in the release of neurotransmitters from neurons. Calcium is also essential for muscle contraction, with its role in this process discovered as early as 1882 by Ringer. Calcium can bind to calcium-modulated proteins such as troponin-C and calmodulin, which are necessary for promoting muscle contraction.
Additionally, calcium ions contribute to the formation of bone structure and the regulation of biological activities in prokaryotic organisms, such as chemotaxis, substrate transport, sporulation, initiation of DNA replication, phospholipid synthesis, and protein phosphorylation. In electrically excitable cells, such as skeletal and cardiac muscles and neurons, membrane depolarization leads to a Ca2+ transient, which is essential for the synchronized contraction of cardiac muscle.
Overall, calcium plays a central role in various biological processes, including muscle contraction, bone formation, and the maintenance of physiological functions, making it a crucial element for the proper functioning of organisms.
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Water's polarity
Water is a polar molecule, meaning it has a slightly negative charge on one side and a slightly positive charge on the other. This polarity is due to the unequal sharing of electrons between the oxygen and hydrogen atoms in a water molecule. The oxygen atom attracts electrons more strongly than the hydrogen atom, resulting in a partial negative charge near the oxygen and a partial positive charge near the hydrogen. This polarity gives water its unique properties, such as its ability to dissolve a wide range of substances.
The polarity of water molecules also leads to the formation of hydrogen bonds, which are intermolecular forces (IMFs) that occur between molecules. In the case of water, each water molecule can potentially form four hydrogen bonds with surrounding water molecules, two with the hydrogen atoms and two with the oxygen atoms. These hydrogen bonds are stronger than ordinary dipole-dipole interactions but weaker than covalent and ionic bonds.
The polarity of water molecules allows them to attract other polar molecules and ions, including many biomolecules such as sugars, nucleic acids, and some amino acids. This property of water is described as hydrophilic ("water-loving"). On the other hand, nonpolar molecules, such as oils and fats, do not interact well with water and are known as hydrophobic ("water-fearing").
The polarity of water also plays a role in its interaction with calcium ions (Ca²⁺). Calcium ions have a strong positive charge, making them highly effective at attracting negatively charged particles, such as the oxygen end of polar water molecules. This electrostatic attraction is crucial in various biological processes, including muscle contraction, signalling, and bone structure formation.
Additionally, the polarity of water molecules affects their interaction with sodium ions (Na⁺). Sodium ions have a weaker positive charge compared to calcium ions, resulting in a weaker electrostatic attraction to polar water molecules. However, sodium ions still play a significant role in biological functions, particularly in nerve impulse transmission and maintaining fluid balance in cells.
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Hydrogen's reactivity
Hydrogen is a highly reactive element. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. It is a nonmetal, except under conditions of very high pressure, where it behaves like a metal. It is a gas at room temperature and atmospheric pressure.
Hydrogen combines with most elements to form hydrides. It combines with every element in the periodic table except the nonmetals in Group VIIIA (He, Ne, Ar, Kr, Xe, and Rn). Hydrogen forms compounds with virtually all the other elements, including metals and nonmetals. For example, hydrogen combines with scandium, titanium, chromium, nickel, and palladium to form materials that behave as if they were alloys of two metals. It also combines with other nonmetals to form covalent compounds such as H2O, CH4, and NH3.
Hydrogen has three oxidation states, corresponding to the H+ ion, a neutral H atom, and the H- ion. It forms compounds with oxidation numbers of +1 and -1. Hydrogen is oxidized by elements that are more electronegative to form compounds with an oxidation number of +1. It is reduced by elements that are less electronegative to form compounds with an oxidation number of -1.
The dissociation energy of molecular hydrogen is 104,000 calories per mole (104 kcal/mole). At room temperature, the reaction rates are usually very low. However, at elevated temperatures, the reaction rates are high. For example, a mixture of hydrogen and chlorine will react explosively at room temperature if sparked, yielding hydrogen chloride (H2 + Cl2 → 2HCl). Mixtures of hydrogen and oxygen react at a measurable rate only above 300° C, according to the equation 2H2 + O2 → 2H2O.
Hydrogen plays a crucial role in acid-base reactions, which mainly involve proton exchange among soluble molecules. In ionic compounds, hydrogen can take the form of either a negatively charged anion, known as hydride, or a positively charged cation, H+, called a proton.
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Frequently asked questions
Hydrogen does not form an electrical attraction with calcium. However, calcium reacts with hydrogen gas to form calcium hydride, which is a stable ionic compound.
The chemical equation for the formation of calcium hydride is:
> Ca + H2 -> CaH2
The chemical formula of calcium hydride is CaH2.
When calcium hydride comes in contact with water, it forms calcium hydroxide and hydrogen gas. The chemical equation for this reaction is:
> CaH2 + 2H2O -> Ca(OH)2 + 2H2
Calcium ions (Ca2+) play a significant role in various biological and chemical processes. They are involved in muscle contraction, signaling, and bone structure formation.
