Please help me as fast as possible! I really need help! I’ll mark as brainliest for correct answers. Please help fast please please

As in having the same number of electrons, Kr, Br, and Se2 are isoelectronic (36).

To learn more about chemical symbols refer

https://brainly.com/question/4839867

#SPJ1

Answer:2nd shell to the 4th shell

Explanation:it is in the excited state because the electrons have been moved to higher energy levels and do not fully fill the lower levels, as an atom in the ground state would, the second shell has moved to the fourth shell and not all 11 electrons are in their lowest energy level

The electronic configuration for the first excited state of bromine and chlorine is 4 p³ 4 d² and 3 p³ and 4 s ¹.

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.

Learn more about electronic configuration,here:

https://brainly.com/question/29184975

#SPJ4

As water undergoes a phase change to steam.

The first phase) Liquid water.

Final phase) Steam water.

The direction of the energy is from the surroundings to the system that contains the liquid water. We can say this is endothermic, the system needs the energy to produce the process. The flow of the energy goes from the outside to the inside.

The balanced net ionic equation resulting from the addition of aqueous hydrochloric acid (HCl) to solid chromium(III) hydroxide (Cr(OH)3) is: Cr(OH)3(s) + 3H+(aq) → Cr3+(aq) + 3H2O(l)

A chemical equation known as an ionic equation uses individual ions to represent the formulae of dissolved aqueous solutions. The presence of so many different ions can make it more difficult to visually understand what is happening in the reaction, even if this form more properly depicts the mixture of ions in solution. Chemical equations known as ionic equations solely display the ions involved in a chemical reaction. Or, the ions that combine in a solution to react and create new compounds. Those ions that are not participants are referred to as spectator ions.

More on ionic equation: https://brainly.com/question/1411697

#SPJ11

Answer:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of a substance.

A chemical property describes the ability of a substance to undergo a specific chemical change and form new substances.

Explanation:

To know which one is which, just REMEMBER physical property can be observed without changing the original substance, while chemical properties require a change in the original substance, which occurs when the new subtance is formed after undergoing the chemical reaction.

Yes, More heat speeds up the dissolving reaction by supplying energy to break bonds in the solid. This is the most prevalent case in which an increase in temperature causes an increase in solid solubility.

As the temperature of the solution rises, so does the average kinetic energy of the solute molecules. As a result, the molecules are less able to stick together and disintegrate more easily. As a result, increasing the temperature increases the solubility of solid states.

Solute and solvent crystal structures must be identical. When the solvent and solute have the same valency, complete solubility occurs. A metal with a higher valency is more likely to dissolve a metal with a lower valency. The electronegativity of the solute and solvent should be comparable.

To know more about solubility visit:

https://brainly.com/question/28170449

#SPJ4

Magnesium carbonate breaks down into solid magnesium (MgO) & gaseous carbon dioxide in the aforementioned mechanism, which is a chemical property (CO2).

In these equations, chemical reactions are represented by chemical formulae and symbols. Chemical equations have two sides: the reactants are on the left, and the products are on the right.

Chemical equations represent the transformation of reactants into products in this process. Take the combination of iron (Fe) with sulfur (S) to create iron sulfide as an example. Fe(s) = S(s) + FeS (s) Iron and sulfur react, as indicated by the plus symbol.

To know more about Chemical equation visit:

https://brainly.com/question/30087623

#SPJ1

The order from lowest to highest pH (or highest to lowest acidity) for the given items is:

Soap (pH around 10-11)

Milk (pH around 6.5-6.7)

Blood (pH around 7.35-7.45)

Coffee (pH around 4.5-5.0)

So the correct order is: coffee, milk, blood, soap.

Acids and bases are substances that have opposite properties, with acids having a sour taste, ability to corrode metals, and ability to change litmus paper from blue to red, while bases have a bitter taste, feel slippery, and change litmus paper from red to blue. The pH scale is used to measure the acidity or basicity of a substance, ranging from 0 to 14, with 7 being neutral, values below 7 being acidic, and values above 7 being basic.

In the given list of items, soap has the highest pH and is the most basic, followed by milk, blood, and coffee. Soap is a common household item that is used for cleaning, and it is alkaline in nature, with a pH of around 9-10. Milk is slightly acidic, with a pH of around 6.5-6.7, while blood has a slightly basic pH of around 7.35-7.45, which is crucial for maintaining the body's pH balance. Coffee is acidic, with a pH of around 5.0, which gives it a slightly bitter taste.

Understanding the pH scale and the properties of acids and bases is important in various fields, including chemistry, biology, and medicine, as it helps in the understanding of chemical reactions, body function, and the effects of substances on the environment.

Learn more about pH here:

https://brainly.com/question/2288405

#SPJ11

The wavelength needed to remove an electron from the valence shell of an atom can be calculated using the equation λ = h / (E * c).

To calculate the wavelength needed to remove an electron from the valence shell of an atom, we can use the equation λ = h / (E * c), where λ represents the wavelength, h is Planck's constant (6.62607015 x 10^⁻ ³⁴  J·s), E is the energy required to remove the electron, and c is the speed of light (2.998 x 10^⁸  m/s).

The energy required to remove an electron is known as the ionization energy, which is specific to each atom. By substituting the appropriate values into the equation, we can determine the wavelength of the electromagnetic radiation necessary to remove the electron.

Learn more about wavelength

brainly.com/question/31143857

#SPJ11

Considering the definition of ideal gas law,  a pressure of 1.5 atm is required to achieve a CO₂ concentration of 0.0620 mol L⁻¹ at 20°C.

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P×V = n×R×T

So the pressure is calculated as:

\(P=\frac{n}{V}xRxT\)

In this case, you know:

Replacing:

P=0.0620 \(\frac{mol}{L}\)× 0.082 \(\frac{atmL}{molK}\)× 293 K

Solving:

P= 1.489612 atm≅ 1.5 atm

Finally, a pressure of 1.5 atm is required to achieve a CO₂ concentration of 0.0620 mol L⁻¹ at 20°C.

Learn more:

https://brainly.com/question/4147359?referrer=searchResults

Expressing the answer in exponential form we get 3⁴.

To simplify the expression (3⁷/(3³), we can apply the properties of exponents. When dividing two exponential expressions with the same base, we subtract the exponents.

In this case, we have 3⁷ divided by 3³, which can be simplified as:

3⁽⁷⁻³⁾

3⁴

Therefore, the simplified expression is 3⁴.

To understand why we subtract the exponents when dividing, we can break down the steps.

The expression 3⁷ represents 3 multiplied by itself seven times:

3 × 3 × 3 × 3 × 3 × 3 × 3.

The expression 3³ represents 3 multiplied by itself three times:

3 × 3 × 3.

When dividing these two expressions, we can cancel out common factors by subtracting the exponents:

(3 × 3 × 3 × 3 × 3 × 3 × 3) / (3 × 3 × 3)

This simplifies to:

3 × 3 × 3 × 3

Which is equivalent to 3⁴.

Thus, the answer in exponential form is 3⁴

Learn more about properties -

brainly.com/question/29547278

#SPJ11

Answer:

yep.

Explanation:

I love to wear oversized hoodies and I get soft comfy blankets and watch movies. Have a nice night! :)

The observed variance (2obs) is the sum of the variances contributed by these four factors, i.e., 2obs = 2column + 2detector + 2injection + 2tubing.

It seems that the observed variance (2obs) for a peak is the sum of the variances from all contributing factors. According to the information provided, the following factors contribute to 2obs:

Column: This refers to the chromatography column used in the separation process. The properties of the column, such as its length, diameter, and stationary phase, can affect the variance of the peak.

Detector: The detector used in the analysis can also contribute to the observed variance. The sensitivity, noise level, and other characteristics of the detector can influence the variance.

Injection: The way the sample is introduced into the system can affect the peak variance. The injection technique, injection volume, and other factors can contribute to the overall variance.

Tubing: The tubing used in the system can also contribute to the peak variance. The diameter, length, and material of the tubing can affect the variance.

Therefore, the observed variance (2obs) is the sum of the variances contributed by these four factors, i.e., 2obs = 2column + 2detector + 2injection + 2tubing.

Learn more about variance

brainly.com/question/31432390

#SPJ11

Answer:

a weak acid consist of mostly non ionized acid molecule

Out of the answer choices, rubidium has the highest energy valence shell. With a single electron in the fifth energy level, krypton will have the highest number of energy levels of the group I elements listed.

kasama na po jan ang explenation

The value of electric flux is 2.45N.m²/C.

A flat sheet of paper of area 0.130 m² is oriented so that the normal to the sheet is at an angle of 56 ∘ to a uniform electric field of magnitude 18 N/C.

The electric flux through the paper is given by;

ϕ=E.A.cosθϕ

= Electric fluxE

= Electric field intensityA

= Area of the surfaceθ

= Angle between electric field intensity and normal to the surface

Given,E = 18 N/C A = 0.130 m² θ = 56°

The electric flux through the paper is :

ϕ=E.A.cosθϕ

= (18 N/C)(0.130 m²)cos56°ϕ

= 2.45 N.m²/C

The electric flux through any closed surface is proportional to the charge enclosed by the surface. The electric flux through an open surface can be calculated by multiplying the electric field intensity with the area of the surface and the cosine of the angle between the electric field intensity and the normal to the surface.

To know more about electric field intensity click on below link:

https://brainly.com/question/16869740#

#SPJ11

Complete question:

A flat sheet of paper of area 0.130 m2 is oriented so that the normal to the sheet is at an angle of 56 ∘ to a uniform electric field of magnitude 18 N/C .Find the amount of elctric flux passing through the sheet?

For the given equation, the mole-to-mole ratio and volume-to-volume ratio for all the gaseous reactants and products are 1:1.

For the given equation:

CH4(g) + O2(g) → CO2(g) + H2O(g)

Reactant/Product:

CH4(g)

O2(g)

CO2(g)

H2O(g)

Mole-to-Mole Ratio:

By comparing the reactant and product coefficients, we may extract the mole-to-mole ratio from the balanced equation.

CH4(g): 1 mole

O2(g): 1 mole

CO2(g): 1 mole

H2O(g): 1 mole

All of the reactants and products have a mole-to-mole ratio of 1:1:1:1.

Ratio of Volume to Volume:

The ideal gas law, which states that under constant temperature and pressure, the volume of a gas is directly proportional to the number of moles in the gas, can be used to calculate the volume-to-volume ratio.

All gaseous reactants and products have a mole-to-mole ratio of 1:1, hence the volume-to-volume ratio will also be 1:1. As a result, the volume of drug A and substance B will be equal.

You can just take the volume of substance A as the value for substance B if you know the volume of substance A and are trying to solve for the volume of substance B. Alternatively, the quantity of substances A and Bwill be the same, given the 1:1 volume-to-volume ratio.

For more such questions on reactants visit:

https://brainly.com/question/26283409

#SPJ8

Intermolecular  forces  of attraction prevent ice cubes from adopting the shape of their container,intermolecular forces are overcome when ice melts,intermolecular forces are overcome when liquid water is vaporized and for conversion to hydrogen and oxygen gas intramolecular forces are overcomed.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

Learn more about forces of attraction,here:

https://brainly.com/question/2224641

#SPJ1

Therefore, there are approximately 0.1135 moles of sucrose in a can of cola.

Sucrose, also known as table sugar, has the chemical formula \(C_{12}H_{22}O_{11}\). The molar mass of sucrose can be calculated by adding up the atomic masses of each element in the molecule. Carbon, hydrogen, and oxygen are the main elements in sucrose and each have a unique atomic mass. By multiplying the number of atoms of each element by its atomic mass, we get the total molar mass of the molecule, which is 342.34 g/mol. To find the number of moles of sucrose in a sample, we divide the mass of the sample by its molar mass. In this case, 39 g of sucrose represents 0.1135 moles.

\((12*12.01) + (11.16.00) = 342.34 g/mol\)

So the number of moles of sucrose is:

\(\frac{39}{342.34} = 0.1135\)

Learn more about sucrose here

brainly.com/question/28869238

#SPJ4

Answer:

I think the answer is period 7

Explanation:

The period in periodic table, in which no stable ions of elements exists is 7th period. They contains actinides.

Actinides are 7th period elements classified to F block of periodic table. A periodic table contains vertical columns called groups and horizontal rows called periods.  Each elements are classified into suitable groups based on their similarity in properties with other group elements.

There are four blocks in periodic table which are s, p, d and f block. S block elements are metals and d block contains transition metals and p block have non metals including gases and metalloids.

Actinides are f- block metals. All the elements in the period are radioactive. That's why they don't have a stable isotope or ion. They continuously undergo radioactive decay by the emission of charged particles.

Hence, the period containing unstable elements is 7th one.

To find more about actinides, refer the link below:

https://brainly.com/question/5188867

#SPJ2

Answer:

ΔT ≈ 7°C (1 sig-fig)

Explanation:

Q = mcΔT => ΔT = Q/mc = 1000J/150g·0.96j·g·°C = 6.94°C ≈ 7°C (1 sig-fig)

Answer:

200.0°C.

Explanation:

The resulatant volume of gas under given conditions is 9.49 liters.

Ideal gas equation gives idea about the behavior of gases at different conditions and it will be represented as:

PV = nRT, where

P = pressure in atm

V = volume in L

n = moles of gas

R = universal gas constant = 0.082 L.atm/K.mol

T = temperature in K

First we calculate the moles of gas by putting the values according to the first condition in the above equation and we have

n = (0.921)(500) / (0.082)(473) = 11.86 moles

Now we calculate the volume of gas by using the above equation and details of the second condition as:

V = (11.86)(0.082)(293) / (30) = 9.49 L

Hence resultant volume of the gas is 9.49L.

To know more about ideal gas equation, visit the below link:

https://brainly.com/question/555495

#SPJ2

Cardiovascular diseases (CVDs) are the most common cause of death worldwide, claiming the lives of an estimated 17.9 million persons each year. CVDs are a group of heart and blood disorders.

The bone marrow produces stem cells, the building blocks that the body uses to make the different blood cells – red cells, white cells and platelets. The erythropoietin sends a message to the stem cells telling more of them to develop into red blood cells, rather than white cells or platelets.

Whole blood is made up of red blood cells, white blood cells and platelets, all of which are suspended in a liquid called plasma. Whole blood and each of it's four components are all valuable tools in modern medicine.

To know more about blood visit:

https://brainly.com/question/30089368

#SPJ4

Answer:

Explanation:

an atom is a neutral particle because it contain equal number of positive and negatively charge particle

Answer:

because it consists of the equal number of protons

Which statement about photosynthesis is FALSE?

Answer:

b. Oxygen is needed as a reactant to produce

glucose is the incorrect statement here

Explanation:

plants uses simple raw materials to prepare their food , which includes water ( H2O ) and Carbon dioxide ( CO2 ).

and traps sunlight by Green pigments known as chlorophyll and stores these energy in bonds of glucose molecules

so ,

after this reaction glucose and oxygen is formed as products

● hence we conclude that Oxygen is not needed as a reactant to produce glucose , oxygen is the bi product formed during photosynthesis.

Answer:

Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.

Explanation:

He holds a marshmallow on a metal skewer over a fire. A few seconds late, the marshmallow is cooked and the skewer feels warm.

The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.

The term thermal energy refers to a form of energy that exists as a result of the temperature difference between two bodies. Thermal energy will always flow from the hotter to the cooler body.

Hence, the marshmallow is cooked and the skewer feels warm shortly after because the heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.

Learn more about thermal energy:https://brainly.com/question/11278589

1s2,2s2,2p6

Explanation:

electron arrangements