is MgBr2 a covalent bond or an ionic bond

Answer:

Both p2=p1(t2/t1)(v1/v2) and p1v1t2=p2v2t1

Explanation:

Hey Friend, I think the answer is C give me Brainlist If correct thanks

The chemical behaviour of an atom is primarily determined by the number of its valence electrons, which are the ones that participate in chemical reactions.

An atom’s chemical behaviour is determined mostly by its number of valence electrons. Option D is correct. The valence electrons, which are the electrons in the outermost shell of an atom, are the ones primarily involved in chemical reactions.

These electrons can be shared, lost, or gained in a chemical reaction, thereby determining the atom’s chemical behaviour. For example, Hydrogen has one valence electron, and it forms bonds with other atoms by sharing or losing that electron.

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Answer: Option (A) is the correct answer.

Explanation:

In liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. As a result, they have some amount of kinetic energy which is greater than that present within molecules of a solid.

Due to this a liquid is able to occupy the shape of container in which it is placed. Hence, a liquid substance will always have a definite volume but not fixed shape.

Thus, we can conclude that the statement liquid state has a definite volume and a definite shape, is not true about the liquid state of matter.

The incorrect statement about the liquid state of matter is that it has a definite volume and a definite shape. In reality, liquids have a definite volume but take on the shape of their container, therefore they do not have a definite shape.

The statement which is not true about the liquid state of matter is:

A. The liquid state has a definite volume and a definite shape.

This statement is incorrect because liquids do not have a definite shape; they take the shape of their container. In the liquid state, the particles have enough energy to partially overcome intermolecular interactions allowing them to move about while remaining in close contact, which gives the liquid a definite volume but an indefinite shape. Liquids are known for their characteristics of adapting to the shape of their container while retaining a fixed volume, similar to mercury, which is unique for being a metal that is liquid at room temperature and exhibiting high surface tension.

Answer:

The answer is 108 if you are coming from Mastering Chem

Explanation:

Answer: 25.5 L

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

We are given:

50.75 g of a gas occupies = 10.0 L at STP

Thus 129.3 g  of a gas occupies =[tex]\frac{10}{50.75}\times 129.3=25.5L[/tex] at STP

Thus 129.3 g of gas will occupy 25.5 L at STP.

Answer:

Theoretical yield of H2 = 10.0 g

Explanation:

Given:

Moles of Zn added = 5.00

To determine:

The theoretical yield of H2 gas

Calculation:

The balanced reaction between Zn and HCl is as shown below:

[tex]Zn + 2HCl \rightarrow ZnCl2 + H2[/tex]

Based on the reaction stoichiometry:

Since HCl is in excess, the limiting reagent is Zn. Thus,

1 mole of Zn will produce 1 mole of H2

Accordingly, 5 moles of Zn will produce 5 moles of H2

Molar mass of H2 = 2 g/mol

Mass of H2 produced = [tex]Moles * Molar\ mass = 5.00 mol*2 g/mol = 10.0 g[/tex]

Answer:

The answer is lead (II) oxide.

Hope this helps you

Final answer:

The unpredictability of various factors impacting population changes poses challenges in accurate projections made by population experts.

Explanation:

One necessary source of error for a population expert making future population growth graphs is the unpredictability of factors affecting population changes. These factors include birth rates, death rates, migration, and resource limits impacting population growth. Additionally, mitigation measures undertaken by countries or unforeseen events altering societal dynamics can lead to inaccuracies in long-range population projections essential for planning purposes. Population forecasts attempt to estimate growth rates, but unpredictable changes in fertility, mortality, and migration rates can pose challenges in accurate projections.

Correct option is B.

B. The signal produces a protein  

There are many kinds of signals that reach the inside of cell. Every signal carry some important message regarding the functioning of cell or any other part of body. Normally signals that penetrate in the cell translate a protein to carry out their function. So, signals actually stimulate the machinery of the cell and make it to produce the protein of its own desire.

Once intercellular signals reaches inside of the cell by the receptor then it helps in the intercellular communication among each other.

Further Explanation:

The receptors are usually the proteinaceous structure that resides over the surface of the cell as well as present inside it. It receives signals in various forms. These signals may only interact with the receptor on the outer surface of the cell or it may reach inside the cell and interact with the receptor molecule. The interaction may result in the manipulation in the transcription process as some of the genes will be stimulated to transcribe into the protein or some may get inhibited.

There can by different types of signal molecule. They are:

1. Autocrine: These signals are produced by the cell type to which the signaling molecule get attached. Therefore they acts over self-cell. This kind of signaling happens in the early development of an organism.

2. Paracrine: These signals produced by the signaling cell acts locally on the cell that lies closer to them.They generally produces faster response.

3. Endocrine: These signals travels to the longer distance and acts over the cells residing over there. They generally produces slower response.

Learn more:

1. Learn more about receptor https://brainly.com/question/7178431

2. Learn more about cell https://brainly.com/question/5923583

3. Learn more about cell cycle https://brainly.com/question/1600165

Answer Details:

Grade: College Biology

Subject: Biology

Chapter: Signal transduction

Keywords:

Intercellular signals, receptor, intercellular communication, transcription, autocrine, cell, organism, paracrine, endocrine.

Answer:

The answer is 12

Explanation:

Dry ice and water ice are both forms of solid matter, thus, they share similar properties such as having a fixed shape and being incompressible. One of their notable shared attributes is their ability to undergo the process of sublimation.

Both dry ice (solid carbon dioxide, CO₂) and water ice are forms of solid matter, which means they are composed of atoms, molecules or ions and their particles are closely packed together. As a result, they share some physical properties. For instance, both dry ice and water ice have a fixed shape and are generally incompressible.

Both substances can also undergo sublimation which is a process where a substance transitions directly from a solid to a gas, bypassing the liquid state. For dry ice, it sublimes at room temperature and pressure, while water ice requires temperatures below its melting point to sublime. This process may be visible as mist or frost in the air.

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Answer:

Option d

Explanation:

The question is to find the reason why our feet feel cooler on a tile floor than on a warm rug.

The reason is

i) the tile is a better heat conductor and it moves our body heat faster away from our skin.

ii) The rug is a good insulator and hence it slows down the flow of heat from our skin of touch and hence we feel warmer

So out of the four options

option d is right.

The rug is a better insulator than the tile.

The volume of one sodium atom with a metallic radius of 186 pm is [tex]\boxed{26965110.857\;{\text{p}}{{\text{m}}^3}}[/tex]

Further explanation:

The smallest particle that is the building block of matter is known as an atom. Most of the space in an atom is empty and its mass is concentrated inside a small region called the nucleus.

Protons, electrons, and neutrons are the three subatomic particles that are present in the atom. Electrons revolve around the nucleus in definite orbits.

The measure of the size of the atoms is known as its atomic radius or atomic size and is defined as the distance from the nucleus to the outermost shell that contains the electrons.  

Types of atomic radius:

1. Covalent radius

Half of the internuclear separation between the nuclei of the two single-bonded atoms of the same species is termed as a covalent radius.

2. Van der Waals radius

It is half of the distance between two unbonded atoms when these have balanced electrostatic forces of attraction.

3. Metallic radius

Half of the distance between the nuclei of two atoms in a crystal is called a metallic radius.

Consider the sodium atoms to be spherical. The formula to calculate the volume of spherical sodium atoms is as follows:

[tex]{\text{V}} = \frac{4}{3}{\pi }}{{\text{r}}^3}[/tex]                                                        …… (1)

Here,

V is the volume of sodium atoms.

r is the radius of the sodium atom.

The value of r is 186 pm.

Substitute this value in equation (1).

[tex]\begin{aligned}{\text{V}}&=\left( {\frac{4}{3}}\right) \times \left( {\frac{{22}}{7}} \right) \times {\left( {{\text{186 pm}}}\right)^3} \\&=\left( {\frac{{88}}{{21}}} \right) \times 6434856\;{\text{p}}{{\text{m}}^3} \\&=26965110.857\;{\text{p}}{{\text{m}}^3} \\ \end{aligned}[/tex]

Therefore, the volume of one sodium atom with a metallic radius of 186 pm is [tex]\boxed{26965110.857\;{\text{p}}{{\text{m}}^3}}[/tex]

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Solid State

Keywords: volume, sodium atom, 186 pm, radius, metallic radius, atomic radius, 26965110.857 pm3, atomic radius, covalent radius, van der Waals radius.

Final answer:

Dimethylamine is more water soluble than triethylamine due to its smaller size and ability to form hydrogen bonds more easily, making it dissolve better in water.

Explanation:

The question asks which compound, dimethylamine or triethylamine, is more soluble in water. Water solubility in amines is influenced by the length of the carbon chain and the molecule's ability to form hydrogen bonds. Smaller amines with fewer carbon atoms, such as dimethylamine, are typically more soluble in water compared to larger amines with more carbon atoms, like triethylamine. Molecules like dimethylamine that can form hydrogen bonds easily dissolve in water, whereas triethylamine, which is bulkier and less able to engage in hydrogen bonding, is less soluble. Therefore, dimethylamine would have a higher solubility in water than triethylamine. The basicity of amines also affects their water solubility as they can dissolve in dilute mineral acid solutions, which is useful for the separation of amines from non-polar solvents.

According to the electronic configuration and valency, ratio of ions in compound formed of group 1 and group 17 is 1:1 as they both have charges +1 and-1 respectively.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Learn more about electronic configuration,here:

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Magnesium (Mg) belongs to group II A in the periodic table with atomic number = 12

Mg Electron configuration = 1s²2S²2p⁶3s²

Nitrogen (N) belongs to group V A in the periodic table with atomic number = 7

N electron configuration= 1s²2s²2p³

Valence electrons for Mg = 2

Valence electrons for N = 5

Mg loses 2 electrons and N gains 3 electrons to complete its octet

Thus, the Formula unit when Mg and N bond is Mg₃N₂

Answer:

oxygen

Explanation:

Always needed to combust