A substance composed of two or more elements chemically combined in a definite, fixed proportion by mass is:_________

1 answer:

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A substance composed of two or more elements chemically combined in a definite, fixed proportion by mass is a Compound

A compound is a fabric composed of two or greater components. Water, carbon dioxide and desk salt are a few examples of compounds.

Compound A substance including atoms or ions of two or extra extraordinary factors in precise proportions joined with the aid of chemical bonds into a molecule. The factors can not be separated by means of bodily approach. Water, as an instance, is a compound having hydrogen atoms and one oxygen atom according to molecule.

Milk isn't compound. A compound is an entity which includes or greater distinctive atoms associating with chemical bonds. Milk is an emulsion or colloid of fats globules within a water-primarily based fluid that consists of dissolved carbohydrates and protein aggregates with minerals.

A compound contains atoms of various elements chemically blended together in a fixed ratio. An detail is a pure chemical substance made of same type of atom. Composition. Compounds include one-of-a-kind factors in a fixed ratio arranged in a described manner via chemical bonds.

Compounds shape as a result of chemical reactions. The factors in compounds are held together with the aid of chemical bonds. A chemical bond is a pressure of appeal among atoms or ions that proportion or switch valence electrons. Water is an instance of a commonplace chemical compound.

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1. For each of the molecules below, determine the electron geometry, molecule geometry, and bond

Alexxx [7]

Answer:

CCl4- tetrahedral bond angle 109°

PF3 - trigonal pyramidal bond angles less than 109°

OF2- Bent with bond angle much less than 109°

I3 - linear with bond angles = 180°

A molecule with two double bonds and no lone pairs - linear molecule with bond angle =180°

Explanation:

Valence shell electron-pair repulsion theory (VSEPR theory) helps us to predict the molecular shape, including bond angles around a central atom, of a molecule by examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement which tends to minimize repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom are either bonding pairs of electrons, located primarily between bonded atoms, or lone pairs. The electrostatic repulsion of these electrons is reduced when the various regions of high electron density assume positions as far apart from each other as possible.

Lone pairs and multiple bonds are known to cause more repulsion than single bonds and bond pairs. Hence the presence of lone pairs or multiple bonds tend to distort the molecular geometry geometry away from that predicted on the basis of VSEPR theory. For instance CCl4 is tetrahedral with no lone pair and four regions of electron density around the central atom. This is the expected geometry. However OF2 also has four regions of electron density but has a bent structure. The molecule has four regions of electron density but two of them are lone pairs causing more repulsion. Hence the observed bond angle is less than 109°.

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3 years ago

The element in Group 14 Period 4 has how many neutrons and is it a metal, nonmetal, metalloid or noble gas.

monitta

Number of neutrons=41, and it is metalloid

<h3>Further explanation</h3>

Group 14⇒valence electron = 4(ns²np²)

Period 4⇒n=4

So electron configuration of the element :

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p² = 32 electron=atomic number

The element with atomic number 32, which is in period 4 and group 14 is Ge-Germanium

There are seven elements that can be classified as metalloids, namely boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), and polonium (Po).

While the mass number: 73

So the number of neutrons = mass number-atomic number

$\tt 73-32=41$