can someone help me please

The double bonds in CO2 are counted as single regions of electron density.

The valence shell electron pair repulsion theory VSEPR  is a description of the shape of molecules based on the number of electron pairs that surround the central atom in the molecule. Double bonds are counted as a single region of electron density.

Hence, the two double bonds in CO2 are counted as two regions of electron density around the central carbon atom. Hence, the molecule is liner at a bond angle of 180 degrees.

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When you compare the atomic radius of silicon (Si) to that of phosphorus (P), the atomic radius of silicon is larger.

Silicon and phosphorus are both elements found in the same period (Period 3) of the periodic table. As we move across a period from left to right, the atomic radius generally decreases.

This decrease in atomic radius is due to the increase in the number of protons in the nucleus, which leads to a stronger attraction between the electrons and the nucleus, pulling the electrons closer and thus reducing the atomic radius.

Silicon has an atomic number of 14, while phosphorus has an atomic number of 15. Since silicon is to the left of phosphorus in the periodic table, it has a larger atomic radius.
In summary, when comparing the atomic radius of silicon to phosphorus, silicon has a larger atomic radius due to its position in the periodic table.

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As the PMHNP, you decide to order a lithium level that comes back at 2.3mmol/l. The best line of action to take Examine other hypotheses for the cause of his symptoms and give him loperamide for diarrhoea and ropinirole for the tremors.

What do you mean by lithium level?

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…for his invention of the Wilson cloud chamber, which became widely used in the study of radioactivity, X rays, cosmic rays, and other nuclear phenomena.

The reaction is  the reduction – oxidation reaction is the :

Ca(OH)₂ + 2CH₃COOH → Ca(CH₃COO)₂ + 2H₂O. The correct option is d.

The gain of the electron is the reduction. In the reduction the oxidation number will increases. The loss of the electron during the reaction is called the oxidation and the decrease in the oxidation number is the oxidation. When both occur in the reaction the reaction is said to be the redox reaction or the reduction – oxidation .

The reaction is as:

Ca(OH)₂ + 2CH₃COOH → Ca(CH₃COO)₂ + 2H₂O

This  is not the redox reaction as the oxidation states of the multiple atoms is not change during the reaction.

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Answer:

Radium

Explanation:

Radium is a radioactive element which was often put in beauty products.

Answer:

A --0.26 mol

Explanation:

using the stoichiometry ratio

1mol of sucrose -----> 12 moles of O2

no of mole of O2 = mass in g / mm

mm of O2 =2(16)

=32

no of mole of O2= 100/32

= 3.125 mol

recall

1 mol of sucrose ==> 12 mol of O2

1 mol of sucrose = 3.125/12

=== 0.2604 mol ✅✅

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Answer:

To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C9H8O4. It is convenient to consider 1 mol of C9H8O4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements:

%

C

9

mol C

×

molar mass C

molar mass

C

9

H

18

O

4

×

100

=

9

×

12.01

g/mol

180.159

g/mol

×

100

=

108.09

g/mol

180.159

g/mol

×

100

%

C

60.00

%

C

The oxygen that powers all those explosions makes up approximately 21% of our atmosphere. It's also the most abundant element in the Earth's crust, making up about 47% of the crust by weight.

Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, and it is a highly reactive nonmetal and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2. This is an important aspect of the atmosphere as oxygen makes up approximately 21% of the Earth's atmosphere by volume. Many organisms, particularly obligate aerobes, use oxygen to metabolize and generate energy. Ozone (O3) is a much less stable allotrope of oxygen that is formed in the upper atmosphere by the action of ultraviolet light on atmospheric oxygen.

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Answer:

To find out the number of atoms: MULTIPLY all the SUBSCRIPTS in the molecule by the COEFFICIENT

Explanation:

The number of each atoms in a compound is written as subscripts of the chemical symbol for each element. Therefore we can count the atoms from the chemical symbol and corresponding  subscripts of the compound.

A chemical formula is used to identify the compound as well as to distinguish the compound from other compounds. The chemical formula of a compound is written using the chemical symbols of the elements.

Each element in periodic table has their own chemical symbol and are used to represent the elements in chemical reactions. For example the formula of water is H₂O made of 2 hydrogen atoms and one oxygen atom.

Similarly carbon dioxide CO₂ is made of one carbon atom and two oxygen atoms and in Al₂O₃, there are 2 Al and 3 oxygen atoms. In this way, we can count the atoms of a compound from its chemical formula.

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The negatively charged electron in the plum pudding model, however, is smaller than an atom and is negatively charged.

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Answer:

The rate reduces by a factor cf /2.

An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

An atom X has 12 protons and 12 electrons that means X is a neutral atom and the atomic no. is 12 because total no. of protons is equal to atomic number. When it looses the 2 electrons then atom becomes positively charged ion . the charge on the ion is +2.

now, the no. of protons will be = 12

number of electrons will be = 12 - 2 = 10

Thus, An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

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Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

Answer:

12cm^3

Explanation:

Just multiply each of the given dimension.

= 3.0 × 4.0 × 1.0

= 3 × 4 × 1

= 12

Answer:

12cm cubed

Just multiply 3, 4, and 1

mercury is not a mixture it is a element

Answer:

mercury

Explanation:

The concentration that could not be obtained by mixing 25% and 35% acid solutions is 33%. The correct answer is option c.

To determine this, we can consider the properties of the mixture. When two solutions of different concentrations are mixed, the resulting concentration will always lie between the concentrations of the two original solutions. In other words, it will be a weighted average of the concentrations based on the proportions of the solutions being mixed.

In this case, the 33% concentration falls between the concentrations of the two original solutions (25% and 35%). Therefore, it should be possible to obtain a 33% concentration by appropriately mixing the 25% and 35% acid solutions in different proportions.

The correct answer is option c.

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Complete question

Suppose that a chemist is mixing two acid​ solutions, one of 25​% concentration and the other of 35​% concentration. Which of the following concentrations could not be​ obtained?

a. 27​%,

b. 29​%,

c. 33​%,

d. 37​%

Answer:

o an earthworm

Explanation:

Answer:

an earthworm

Explanation:

Answer:

8

I believe 2 moles are produced :/

Answer:

pretty sure -10 degrees

Explanation:

no explanation

Stearic acid molecules, which are composed of long chains of carbon and hydrogen atoms with a carboxylic acid group at one end, do not exist as perfect rectangular prisms in reality.

While it is true that the molecules can form long, straight chains and pack together in a relatively ordered fashion in some cases, the actual shape of the molecules and the way they pack together can be more complex due to factors such as:

Conformational isomers: The carbon chains in stearic acid molecules can adopt different conformations, such as gauche and transforms, which can affect the shape of the molecule and how it interacts with other molecules.

Intermolecular forces: Stearic acid molecules can interact with each other through various intermolecular forces, such as van der Waals forces, hydrogen bonding, and dipole-dipole interactions. These forces can influence the shape of the molecules and the way they pack together.

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Answer:

The answer is

Explanation:

To find the number of atoms in an element given it's number of moles we use the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

n = 7.2 mol

The number of atoms in iron ( Fe) is

N = 7.2 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Gas particles exert pressure on their container through their random and constant motion, colliding with the walls of the container.

Gas particles are in constant motion, moving in all directions with varying speeds. When these particles collide with the walls of their container, they exert a force on the walls. The cumulative effect of these collisions leads to the creation of pressure within the container. The more frequent and energetic the collisions, the higher the pressure exerted by the gas.

The pressure exerted by gas particles is a result of the collective impact of their collisions with the container walls. This pressure is directly related to the temperature, volume, and number of gas particles present. Understanding the behavior of gas particles and their interactions with the container is crucial in various scientific and practical applications, such as in the study of thermodynamics, gas laws, and the design and operation of systems involving gases, such as engines and gas cylinders.

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The formula for the new ion is HPO₄²⁻. The name of the new ion is Hydrogen phosphate.

Hydrogen phosphate is found in a variety of natural systems. It is conjugated to phosphate (PO₄)³⁻ and dihydrogen (D₂PO₄)⁻phosphate. Hydrogen phosphate and its salts are commonly used in fertilizer applications and in cooking.

The majority of hydrogen phosphate salts are colorless, water-soluble, and non-toxic. Hydrogen phosphate is formed by the hydrolysis of water (H₂O) with an anion (P₂O₇)⁴⁻.

In the opposite reaction, a proton is added to the hydrogen phosphate to make it a base, and it is then reformulated with dihydrogen phosphate.

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Answer:

The volume of stock solution needed to make the solution is 1875 ml

Explanation:

The parameters given are;

The volume of 75 M solution of H₂SO₄ = 400 ml

The concentration of stock solution = 16.0 M

Number moles per liter of stock solution = 16 moles

Number of moles in required 400 ml solution = 0.4×75 = 30 M

Volume of stock solution that contains 30 M = 30/16×1 = 1.875 l

The volume of stock solution that is required = 1875 ml

The mechanism of the Fischer esterification reaction of Lauric Acid and Ethanol can be drawn using the curved-arrow notation.

In the Fischer esterification reaction, lauric acid reacts with ethanol to form ethyl laurate and water. The mechanism can be drawn using curved-arrow notation as follows:

Remember that curved-arrow notation shows the movement of electron pairs during a reaction, with the arrow pointing from the electron pair donor to the electron pair acceptor.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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