how can i know the valence electron for the big elements

Answer:

See explanation

Explanation:

We know that photosynthesis involves the combination of carbon dioxide and water in the presence of sunlight to yield glucose.

If the atmosphere is rich in carbon dioxide such as  in a green house where air is filled with carbon dioxide, the rate of photosynthesis is increased.

As the rate of photosynthesis is increased, the growth of plants is also increased.

Hence, in a greenhouse where the air contains more carbon dioxide, the rate of plant growth increases.

As atomic radius decreases, electronegativity increases. This is mostly because a smaller atomic radius represents a stronger hold on the valence electrons.

Answer: A

Explanation: Bob Marshall

The correct answer is A. The conservationist credited with founding the Wilderness Society is Bob Marshall.

Bob Marshall was an American forester, botanist, traveler, climber, writer and social activist who advocated the preservation of unspoiled wildlife.

He actively contributed to the development and adoption of environmental regulations prohibiting the construction of roads in vast federal specially protected natural areas. In 1935 he became one of the founders of the public environmental organization The Wilderness Society and its main sponsor.  

Today Bob Marshall is considered one of the main initiators of the wildlife movement in the United States. Several geographic features are named after him, including the Bob Marshall Wilderness Nature Reserve in Montana and the Marshall Mountain on the Adirondack Ridge.

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Answer:

yes

Explanation:

Yes. Take, for example, an ice cube in an open or closed container, that is in the process of melting at room temperature. There is solid water, liquid water, and water vapour (gas) in the air.

There are three recognized states of water: solid, liquid, and gas. Snow, rain, and clouds are all composed of water in some way. A snowflake is a collection of many ice crystals, a cloud is made up of microscopic water droplets and  ice crystals, and rain is just liquid water.

There are four states of matter are observable in everyday life that are solid, liquid, gas, and plasma. Solids have a definite volume and shape while liquid does not have definite shape and volume.

The states of matter are the three distinct physical forms which matter can take in most environment.

Water exists in all the three states, solid, liquid and gas. It changes according to the temperature.

Thus, There are three recognized states of water: solid, liquid, and gas. Snow, rain, and clouds are all composed of water in some way.

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To draw a Lewis structure, you first need to determine the number of valence electrons each atom has. Then, you can place the atoms on the grid and connect them with bonds to form the skeletal structure of the molecule. Next, you can add lone pairs of electrons to each atom to satisfy the octet rule, which states that atoms tend to bond in such a way as to achieve a full valence shell of eight electrons.

For example, let's consider the Lewis structure of water (H2O). Oxygen has six valence electrons, while each hydrogen has one. Thus, the total number of valence electrons in the molecule is 6 + 2(1) = 8.

To draw the structure, we place the oxygen atom in the center of the grid and connect it to each hydrogen atom with a single bond. We then add two lone pairs of electrons to the oxygen atom, which completes its octet. Each hydrogen atom has two electrons, satisfying its duet.

The resulting Lewis structure for water is O-H, with two lone pairs of electrons on the oxygen atom.

Overall, drawing Lewis structures is an essential skill in chemistry as it provides a visual representation of the molecule and helps predict its properties and behavior.

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Answer:

c

Explanation:

ASTM C1602 outlines the standards for making and curing cementitious specimens. A concrete sample should reach a minimum compressive strength of 2,500 psi (17.2 MPa) after 28 days of curing.  Therefore, YES is the answer.

The compressive strength of cement is the measurement of its capability to resist pressure and is critical in the design of structural components. The water-cement ratio is the ratio of the weight of water to the weight of cement utilized in a concrete mixture. The lower the ratio, the better the concrete’s strength and durability.

In evaluating the suitability of non-potable water available at the job site for mixing concrete, six standard mortar cubes (2 in × 2 in) were made using that water and six others using potable water. After seven days of curing, the cubes were tested for compressive strength and produced the following loads to failure (in pounds): Solution:The non-potable water has a compressive strength of 2660 psi, and the potable water has a compressive strength of 2640 psi.The compressive strengths of the samples are very close, so the water appears to be acceptable for mixing concrete according to ASTM C1602. Therefore, YES is the answer.

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To answer this question, we have to use the ideal gas law:

Where P is pressure, V is volume, n is the number of moles, R is the constant of ideal gases (0.082atmL/molK) and T is the temperature (in Kelvin degrees).

Convert the given temperature to Kelvin degrees:

Solve the equation for P and replace for the given values:

It means that the pressure of helium is 5.98atm.

Answer:

The mass percentage composition of nitrogen in the sample of the cleaning detergent is approximately 16.78%  

Explanation:

The given mass of the sample of the cleaning detergent, m₁ = 20.5 g

The mass of the ammonium hydroxide, NH₄OH in the detergent, m₂ = 8.61 g

The molar mass of NH₄OH = 35.04 g/mol

The molar mass of nitrogen, N = 14.01 g/mol

Therefore, the mass, m₃ of nitrogen, N, in 8.61 g of ammonium hydroxide, NH₄OH, is found as follows;

m₃ = (14.01/35.04) × 8.61 g = (402,087/118,800) g ≈ 3.44 g

The mass of nitrogen, N, in the ammonium hydroxide, NH₄OH, contained in the 20.5 g sample of the cleaning agent, m₃ ≈ 3.44 grams

The percentage composition of nitrogen in the sample of the cleaning detergent, %N is given as follows;

\(\% Composition = \dfrac{Mass \ of \ component}{Total \ mass \ of \ cleaning \ detergent} \times 100\)

Therefore;

%N ≈ ((3.44 g)/(20.5 g)) × 100 ≈ 16.78 %

The percentage composition of nitrogen, %N ≈ 16.78%.

Explanation:

Newtons third law states for every action (force) in nature there is an equal and opposite reaction

10.0 mL of 0.10 M NaOH would need to be added to 10.0 mL of 0.10 M HC₂H₃O₂ to prepare a solution with pH = 5.50.

To prepare an acetate buffer solution with pH 5.50, we need to make sure that the concentration of acetate ions (C₂H₃O₂-) and acetic acid (HC₂H₃O₂) in the solution are in a specific ratio, which corresponds to the pKa of acetic acid (4.76) at the desired pH (5.50).

The Henderson-Hasselbalch equation can be used to calculate the required ratio of C₂H₃O₂- to HC₂H₃O₂:

pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])

Substituting the values for pH and pKa, we get:

5.50 = 4.76 + log([C₂H₃O₂-]/[HC₂H₃O₂])

Solving for [C₂H₃O₂-]/[HC₂H₃O₂], we get:

[C₂H₃O₂-]/[HC₂H₃O₂] = antilog(5.50 - 4.76) = 3.55

So, for every molecule of acetic acid, there must be 3.55 molecules of acetate ions in the solution.

Now, let's consider the reaction between HC₂H₃O₂ and NaOH:

HC₂H₃O₂ + NaOH → NaC₂H₃O₂ + H2O

The balanced equation shows that for every mole of HC₂H₃O₂ that reacts with NaOH, one mole of NaC₂H₃O₂ is formed.

Since we know the initial concentration of HC₂H₃O₂ and the desired concentration of acetate ions in the final buffer solution, we can calculate the amount of NaOH needed to react with the excess acetic acid to produce the desired amount of acetate ions.

First, we calculate the number of moles of HC₂H₃O₂ present in 10.0 mL of 0.10 M solution:

moles of HC₂H₃O₂ = Molarity x volume (in liters) = 0.10 x 0.010 = 0.001 mol

Since we need a ratio of 1:3.55 of HC₂H₃O₂  to C₂H₃O₂-, we calculate the number of moles of C₂H₃O₂- needed:

moles of C₂H₃O₂- = 3.55 x 0.001 = 0.00355 mol

To form 0.00355 moles of NaC₂H₃O₂, we need to react the excess HC₂H₃O₂ with an equal amount of NaOH.

The amount of NaOH needed can be calculated using the following equation:

moles of NaOH = moles of HC₂H₃O₂ = 0.001 mol

Finally, we can calculate the volume of 0.10 M NaOH required:

Volume of NaOH = moles of NaOH / Molarity = 0.001 mol / 0.10 M = 0.010 L = 10 mL

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Answer:

Liquid

Explanation:

Quite an easy question!

Answer:

Liquid

Explanation:

I was passing by lol

The arrangement of its atoms or molecules best explains many physical properties of a material.

What is Metal?

A metal is a type of material that is typically hard, shiny, malleable, ductile, and has good electrical and thermal conductivity. Metals are characterized by their ability to form cations, which are positively charged ions, by losing electrons. They typically have metallic bonds, which are formed when the outermost electrons of metal atoms are delocalized and shared among a lattice of metal ions. This results in metals having a unique set of physical and chemical properties, such as high melting and boiling points, high density, and good strength-to-weight ratios, making them useful for a wide range of applications, including construction, transportation, electronics, and manufacturing.

Many physical properties of a material can be explained by its atomic and molecular structure. The arrangement of atoms and molecules in a material determines its physical properties such as density, melting and boiling points, thermal conductivity, electrical conductivity, and more. For example, a material with a tightly packed atomic arrangement will be denser than a material with a more open arrangement. Similarly, the strength of the bonds between atoms and molecules will determine how much energy is required to melt or boil the material.

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Nitrogen has one sigma bond, 2 pi bonds, and one lone pair. So, its steric number is also sp and its hybridization is sp.

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The properties of sodium and chlorine are different from the properties of table salt. Sodium is a highly reactive metal that is soft and silver in color. It has a low melting point and reacts vigorously with water. Chlorine, on the other hand, is a greenish-yellow gas and is highly reactive. It is toxic and can irritate the respiratory system.

Table salt, which is also known as sodium chloride (NaCl), is formed by the combination of sodium and chlorine. It is a white crystalline solid that is commonly used as a seasoning and preservative in food. Table salt has a high melting point and is soluble in water. Unlike sodium and chlorine, table salt is not highly reactive and is generally considered to be safe for consumption in moderation.
In summary, while sodium and chlorine are highly reactive elements, table salt is a stable compound that is commonly used in everyday life.

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Answer:C

Explanation:

Homogeneous Mixture

Answer:

homogeneous mixture

Explanation:

it is the same throughout so therefore it can be separated

The pH of a solution is a measure of the acidity or basicity of the solution. It is defined as the negative logarithm of the hydrogen ion (H+) concentration in the solution. Therefore, the pH of the solution is 3.91.  

To determine the pH of a solution containing potassium acetate and acetic acid, we need to know the concentrations of the two solutes and the ratio of acetic acid to potassium acetate in the solution.

We are given the concentration of the potassium acetate and the ratio of acetic acid to potassium acetate in the solution. To calculate the pH of the solution, we can use the following equation:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution.

To find the concentration of hydrogen ions in the solution, we can use the following equation:

[H+] = [acetic acid] + [potassium acetate] * ([acetic acid]/[potassium acetate])

Substituting the values we have, we get:

[H+] = (6.84 x \(10^{-2\)) + (0.434 x 6.84 x  \(10^{-2\)) * (0.00072)

[H+] = 6.84 x  \(10^{-2\) + 2.69 x  \(10^{-2\)

[H+] = 9.53 x  \(10^{-2\) mol/L

The pH of the solution can be calculated using the equation:

pH = -log[H+]

Substituting the value of [H+] in the equation, we get:

pH = -log[9.53 x \(10^{-2\)]

pH = 3.91

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Answer:

The answer is "\(\bold{Cl_4}\)"

Explanation:

Please find the complete question in the attachment file.

In this question, it uses the Chemical equations, which is also known as the order to comply with the Law on Mass Conservation, substances must be balanced wherever volume cannot be generated or lost. This should be reacted that the reaction weight becomes equal to a product mass.

Answer:

hydrogen and nitrogen or something?

Explanation:

Answer:

nitrogin and i forgot the other one srry!!

Explanation:

The pH of a salt solution due to hydrolysis of a salt of a weak acid and a strong base will depend on the nature of the ions involved and their interactions with water.

If the salt is derived from a weak acid and a strong base, such as sodium acetate (NaCH3COO), the acetate ion (CH3COO-) is derived from the weak acid (acetic acid, CH3COOH) and the sodium ion (Na+) is derived from the strong base (sodium hydroxide, NaOH). In this case, the acetate ion can react with water in a hydrolysis reaction:

CH3COO- + H2O ⇌ CH3COOH + OH-

The hydrolysis of acetate ion produces hydroxide ions (OH-), resulting in an alkaline solution. As a result, the pH of the salt solution will be greater than 7, indicating alkalinity.

On the other hand, if the salt is derived from a strong acid and a weak base, such as ammonium chloride (NH4Cl), the ammonium ion (NH4+) is derived from the weak base (ammonia, NH3) and the chloride ion (Cl-) is derived from the strong acid (hydrochloric acid, HCl). In this case, the ammonium ion can react with water in a hydrolysis reaction:

NH4+ + H2O ⇌ NH3 + H3O+

The hydrolysis of ammonium ion produces hydronium ions (H3O+), resulting in an acidic solution. Therefore, the pH of the salt solution will be less than 7, indicating acidity.

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If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it.

In the case above,  the vapor pressure of the solution is known to be lowered if compared to the vapor pressure of the pure solution.

Therefore if a non-volatile solute is said to be place or added to a pure solution such as water, the vapor pressure of the solution will be reduced than that of the pure solution.

Hence, the statement that If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it is correct.

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Answer:

14.52%

Explanation:

The percentage by mass (WW%) is calculated by using the formula:

Mass of solute/mass of solution ×

100

The solute (Al) is 22.5g while the solvent (Al2O3) is 155g

Hence, percent by mass is:

22.5/155 × 100

= 0.1452 × 100

= 14.52%

Among the options provided, the BEST indication would likely be:

(C). An unusual colored haze around the scene.

In situations related to potential chemical terrorism or hazardous materials, it is crucial to prioritize safety law enforcement.

Odd scents: The presence of hazardous chemicals may be indicated by the presence of strong, pungent, or odd odors in the region.

Unusual or unexpected casualties: A disproportionately large number of sick or injured people displaying the same symptoms could be a sign of a chemical attack.

Unaccounted-for respiratory distress: People who have trouble breathing, coughing, or respiratory distress may have been exposed to dangerous chemicals terrorism.

Unusual behavior or symptoms can be a sign that someone has been exposed to poisonous substances. These symptoms include nausea, vomiting, dizziness, convulsions, and disorientation.

Unusual environmental changes: Concerns about chemical contamination may be raised by sudden alterations in the area's vegetation, dead or dying animals, or air quality.

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Answer:

Because it is the same element but has different atomic mass

Answer:

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

distance = velocity × time

From the question we have

distance = 75 × 7.5

We have the final answer as

Hope this helps you

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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Answer: ¹²₅C

Explanation:

¹²₅C is incorrect. The superscript is the atomic mass. This varies between each element. The subscript is the atomic number. This doesn't change. You will see every element has the correct atomic atomic number except for Carbon. Carbon should have atomic number 6.

If the digestive system breaks down you would have no ability to get the nutrients.

The digestive system includes the mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus.

If you had no digestive system, you would have no ability to get the nutrients and sugars in food, and you would die.

The digestive system is very long, however. Some people have gotten into car accidents and damaged their intestines, and had to have part of them removed.

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