WILL MARK AS BRAINLIEST
Name the following ionic compounds.

Answer: Option (d) is the correct answer.

Explanation:

Resistance is defined as the ability of a substance to resist the slow of electrons or charges through it.

This means that a resistance is the measure to see how difficultly a charge is flowing through a material. Resistance is represented by R and it's S.I unit is ohms.

According to ohms law, electric current is proportional to voltage and inversely proportional to resistance.

Mathematically,     V = IR

where,    V = voltage

               I = current

               R = resistance

Thus, we can conclude that the statement ability of a material to repel neutral charges and is measured in ohms, best describes resistance.

Answer: Bio-fuels

Explanation:

Bio-fuels are the alternatives of fossil fuels and are directly or indirectly obtained from the plants and other waste materials that are of biological origin. It is much cheaper than the fossil fuels.

The above mentioned crops, algae sugar and other sewage products produces ethanol, undergoing fermentation process, that are essential for making bio-fuels.

Bio-diesel and Bio-ethanol are the two usual types of bio-fuels. Bio-diesels are made up of fats and oils, commonly used to run vehicles whereas bio-ethanol is made from the fermentation of plants and other crops, that are enriched in the production of ethanol.

Final answer:

In ethylene, both carbon atoms are sp2 hybridized and form a planar shape with 120° bond angles. In allene, the central carbon is sp hybridized with 180° bond angles, while the terminal carbons are sp2 hybridized with 120° bond angles, with hydrogen atoms at the central carbon in perpendicular planes.

Explanation:

Hybridization of Carbon Atoms in Hydrocarbons

When determining hybridization at carbon atoms within hydrocarbons such as ethylene (C2H4) or allene (H2C=C=CH2), we consider the number of atoms directly bonded to a carbon atom. In ethylene, both carbon atoms are sp2 hybridized because they each make three sigma (σ) bonds - two to hydrogen atoms and one to each other - and one pi (π) bond is shared between them, forming a double bond (C=C). As for allene, the central carbon is sp hybridized due to possessing two π bonds, one with each of the adjacent carbons, while the terminal carbon atoms are sp2 hybridized.

There are multiple types of bonds in a C=C bond; a σ bond and a π bond. A C=C bond includes one σ bond that results from the head-on overlap of sp2 hybrid orbitals and one π bond that results from the side-to-side overlap of the unhybridized p orbitals.

The shape of the ethene molecule is planar with approximately 120° bond angles due to the sp2 hybridization. In contrast, the allene molecule has a more complex structure where the central carbon has 180° bond angles, and the terminal carbons have 120° bond angles. The hydrogen atoms on the central carbon of allene are in perpendicular planes to each other due to the nature of its hybridization.

In a hydrocarbon, each carbon atom is sp3 hybridized, forming sigma bonds. There are no pi bonds, and all bond angles are approximately 109.5°, representing tetrahedral geometry.

(a) The hybridization at each carbon atom in a hydrocarbon can be determined using the formula "Hybridization = 1/2(V + M - C + A)," where V is the number of valence electrons, M is the number of monovalent atoms, C is the cation charge, and A is the anion charge. For carbon in a hydrocarbon, V = 4, M = 4, and C = A = 0 for neutral carbon. Substituting these values, the hybridization is 1/2(4 + 4 - 0 + 0) = 1/2(8) = 4. Therefore, each carbon atom in the hydrocarbon is sp3 hybridized.

(b) In a hydrocarbon, each bond formed between carbon atoms is a sigma (σ) bond. Thus, the number of sigma bonds is equal to the number of single bonds in the molecule.

(c) A hydrocarbon consists only of single bonds, so there are no pi (π) bonds.

(d) In a hydrocarbon, all the bond angles are approximately 109.5°, corresponding to the tetrahedral geometry of sp3 hybridized carbon atoms.

The question probable may be:

In the hydrocarbon (a) what is the hybridization at each carbon atom in the molecule? (b) how many s bonds are there in the molecule? (c) how many p bonds? (d) identify all the 120° bond angles in the molecule.

Answer:

The lower the pressure the lower the temperature, thus, at 3000 m the pressure is lower, therefore the boiling temperature is lower than at 0 m.

Explanation:

Hello,

In this case, the boiling point of water at the sea level is about 100 °C whereas at 3000 m is about 89.5 °C since the pressure at higher altitudes is less than the atmospheric pressure. In such a way, considering a directly proportional relationship between pressure and temperature, the higher the pressure the higher temperature (sea level) whereas the lower the pressure the lower the temperature (at 3000 m)

Best regards.

Final answer:

The black colored precipitate formed when Fe(NO3)2(aq) and Na2S(aq) are mixed is Iron(II) sulfide, represented by the compound FeS.

Explanation:

When Fe(NO3)2(aq) and Na2S(aq) are mixed, a precipitation reaction occurs. According to solubility rules, sulfides are generally insoluble, except for those of group 1 elements (like Na) and ammonium. Iron sulfide, which is not an exception to this rule, will precipitate as a solid. The black colored precipitate that forms is likely to be FeS (Iron(II) sulfide).

The relevant reaction can be represented by the ionic equation: Fe2+ (aq) + S2- (aq) → FeS (s), where the precipitate is the insoluble iron(II) sulfide.

While the information provided with the question includes several reactions and solubility examples, the key to answering this specific question is understanding the solubility of sulfides and that iron can form a black colored sulfide precipitate.

The electron configuration that represents the electrons in an atom of chlorine in an excited state is 2-8-7. Option 3.

The usual electron configuration for chlorine is 2-8-7. In an excited state, an electron can be temporarily promoted to a higher energy level. For chlorine in an excited state, one electron from the 3rd energy level (7) is elevated to a higher level, leading to the configuration 2-8-7.

This excited electron configuration indicates a temporary alteration in the arrangement of electrons, reflecting the absorption of energy. Once the excitation ceases, the electron returns to its original energy level, and the atom reverts to its ground state configuration (2-8-7).

Which electron configuration represents the electrons in an atom of chlorine in an excited state?

(1) 2-7-7 (3) 2-8-7

(2) 2-7-8 (4) 2-8-8

It is known that at if a gas is identified to be as ideal gas then, at STP, the volume of 1 mole of that gas is equal to 22.4 L. Using this fact and the given volume in this item, we determine the number of moles as that below.

                n = (11.2 L of argon)(1 mol argon / 22.4 L of argon)

                 n = 0.5 moles

Answer: 0.5 moles 

1-2: Metals non-metal.

13-18: Metalloids, Non-Metals, Metals 

Columns 1, 2, and 13-18 on the periodic table are main-group elements, with column 1 containing alkali metals, column 2 containing alkaline Earth metals, and columns 13-18 including groups such as pnictogens, chalcogens, halogens, and noble gases.

Columns 1, 2, and 13-18 on the periodic table represent main-group elements, which are also known as representative elements. The elements in these columns have distinct properties and are usually presented in a way that highlights the similarities within a group.

Elements in column 1, except for hydrogen, are known as the alkali metals. They typically form compounds that consist of one atom of the element and one atom of hydrogen, and they share similar chemical properties.

Column 2 contains the alkaline earth metals. These elements form compounds with two atoms of hydrogen and exhibit comparable properties among themselves.

Columns 13 to 18 include various other families of elements with distinct properties, such as the pnictogens (group 15), chalcogens (group 16), halogens (group 17), and the noble gases (group 18, also known as inert gases).

The elements in these groups also tend to form compounds that reflect their column's valence electron configurations, illustrating the periodic nature of the table in which elements with similar chemical properties appear in vertical columns or groups.

Answer:

Your answer is Mg(NO3)2, in water Mg(NO3)2(aq) → Mg2+(aq) + 2NO3-(aq)

Explanation:

Answer: Outermost orbitals

Explanation:

Answer:

The root will turn 90 degrees downward, and the stem will curl 90 degrees upwards.

Explanation:

Answer:

The root will curl down, and the stem will curl up.

this is for exabit A