What are the most of the elements in the periodic table

Answer:

that make 11 isomers....

The total pressure in the container is equal to the sum of the pressures that are exerted by each of the two gases.

According to Dalton's law of partial pressures, the total pressure exerted by a mixture of non-reacting gases is equal to the sum of the pressures exerted by each individual gas in the mixture. This is because gases behave independently of each other and their individual pressures are additive.

The presence of one gas does not affect the pressure exerted by another gas in the same container. Therefore, the total pressure is simply the sum of the pressures exerted by each gas.

For example, if gas A exerts a pressure of 10 atm and gas B exerts a pressure of 5 atm, the total pressure in the container would be 10 atm + 5 atm = 15 atm.

It is important to note that the volume occupied by the gases does not affect the total pressure in this scenario. The total pressure depends only on the sum of the individual pressures exerted by each gas.

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Carbon dioxide molecules can absorb and emit infrared radiation, and they are one of the most abundant constituents of Earth's atmosphere.

Thus, the correct options are:d) Are one of the most abundant constituents of Earth's atmospheree) Can move in many ways, thus absorbing and emitting infrared radiation

Carbon dioxide is a trace gas present in the Earth's atmosphere. It's a vital component of Earth's carbon cycle, which helps to regulate Earth's temperature and support life as we know it. Carbon dioxide molecules are one of the most common gases in the atmosphere, accounting for around 0.04% of the Earth's atmosphere.

The greenhouse effect is caused by carbon dioxide, methane, and other greenhouse gases. When the Sun's energy reaches the Earth's surface, it is absorbed and then radiated back into space as infrared radiation. Greenhouse gases absorb this radiation and trap it in the atmosphere, which causes the Earth's temperature to rise and the climate to change.

Carbon dioxide molecules are capable of absorbing and emitting infrared radiation due to their molecular structure, which consists of one carbon atom and two oxygen atoms. This property of carbon dioxide is the main reason it's classified as a greenhouse gas.

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Answer:

The correct answer is - 75 grams.

Explanation:

Half-life is the amount of time that is used by the given amount of substance or element to make it half of the initial amount of a particular radioactive substance.

Equation for alpha decay for radon

\(^222_{86}Rn\Rightarrow^{218}_{84}Po  \)

we need to calculate the left amount of radon after given time

using formula half life

\(N(t)=N_{0}e^{-\lambda t}\)

\(\lambda =\dfrac{0.693}{3.82}\)

\(\lambda=0.1814\)

\(N(3.82)=150\times e^{-0.1814\times3.82}\)

\(N(3.82)=75.0\ g\)

Thus, the left amount of radon is - 75 grams.

The volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl is 1.16 L.

The balanced chemical equation for the reaction between zinc and hydrochloric acid is:

\(Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq)\)

We need to find the volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl.

First, we need to determine the number of moles of zinc used in the reaction. The molar mass of zinc is 65.38 g/mol, so:

n(Zn) = 3.50 g / 65.38 g/mol = 0.0536 mol

Since 1 mole of zinc reacts with 1 mole of hydrogen gas, the number of moles of hydrogen gas produced is also 0.0536 mol.

Using the ideal gas law, PV = nRT, we can calculate the volume of hydrogen gas produced. We are given the temperature (315 K) and the pressure (1.25 atm), and the gas constant R is 0.0821 L·atm/(mol·K).

Substituting the values into the equation, we get:

V = (nRT) / P

V = (0.0536 mol) x (0.0821 L·atm/(mol·K)) x (315 K) / (1.25 atm)

V = 1.16 L

Therefore, the volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl is 1.16 L.

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Baking soda neutralizes the acid so D

Baking soda is a weak base and will neutralize the acid.

Explanation:

       \(NaHCO_3+HA\rightarrow NaA+H_2O+CO_2\)

        (Where: HA is the general formula of an acid)

That is why the baking soda is present in the acid spill kits. So from this, we can conclude that the correct answer is option D.

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Answer:

First, the lining may consist of loose, smaller bits of the same materials that have been incorporated into the latticework of the nest. These finer materials are utilized to shed water, deter pests, conceal the eggs from predators, insulate, and cushion them. ... They also serve to insulate and cushion the eggs.

Explanation:

Explanation:

Mg + 2HNO2 → Mg(NO2)2 + H2

Answer:

Mg + 2HNO2 → Mg(NO2)2 + H2

Explanation:

Net pay is the amount paid to employees after deductions like income tax and FICA withholdings.

We need to break down the different components of the payroll costs. Net pay is the amount paid to employees after deductions like income tax and FICA withholdings. In this case, the net pay distributed was $136,500. Income tax withholdings, which are based on the employee's income and tax bracket, were $20,200. FICA withholdings, which include Social Security and Medicare taxes, were $9,025.
To calculate the total payroll costs for this pay period, we need to add the net pay, income tax withholdings, and FICA withholdings. This gives us a total of $165,725. This is the amount that the company paid out to employees for this pay period. However, it's important to note that this total excludes any unemployment taxes.
In summary, the total payroll costs for this pay period, excluding any unemployment taxes, was $165,725. This includes the net pay, income tax withholdings, and FICA withholdings.

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Answer:

the oil spreads to cover the water

Answer:

I think it is ; The oil floats to the surface of the water

Explanation:

I don't know about the other one.

Answer:

single displacement

Explanation:

In the given container, there are approximately 7.4 moles of B₂ and 3.0 moles of N₂. The partial pressure of B₂ is approximately 4.10 atm, and the partial pressure of N₂ is approximately 1.67 atm.

To find the number of moles of each gas and the partial pressures, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

First, let's calculate the number of moles of each gas:

For B₂:

Given mass = 160g

Molar mass of B₂ = 2 * atomic mass of Boron = 2 * 10.81 g/mol = 21.62 g/mol

Number of moles of B₂ = mass / molar mass = 160g / 21.62 g/mol ≈ 7.4 mol

For N₂:

Given mass = 84g

Molar mass of N₂ = 2 * atomic mass of Nitrogen = 2 * 14.01 g/mol = 28.02 g/mol

Number of moles of N₂ = mass / molar mass = 84g / 28.02 g/mol ≈ 3.0 mol

Now, let's calculate the partial pressures of each gas:

To find the partial pressure, we can use Dalton's Law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each gas.

Partial pressure of B₂ = (moles of B₂ / total moles) * total pressure

Partial pressure of B₂ = (7.4 mol / (7.4 mol + 3.0 mol)) * total pressure

Partial pressure of N₂ = (moles of N₂ / total moles) * total pressure

Partial pressure of N₂ = (3.0 mol / (7.4 mol + 3.0 mol)) * total pressure

Now, we can substitute the values and calculate the partial pressures:

Partial pressure of B₂ = (7.4 / 10.4) * total pressure ≈ 0.71 * total pressure

Partial pressure of N₂ = (3.0 / 10.4) * total pressure ≈ 0.29 * total pressure

Given that the pressure of B₂ is 4.1 atm and the pressure of N₂ is 2.4 atm, we can set up the following equations:

0.71 * total pressure = 4.1 atm

0.29 * total pressure = 2.4 atm

Solving these equations, we find:

Total pressure ≈ 5.77 atm

Now we can substitute the total pressure into the partial pressure equations to find the partial pressures:

Partial pressure of B₂ = 0.71 * 5.77 atm ≈ 4.10 atm

Partial pressure of N₂ = 0.29 * 5.77 atm ≈ 1.67 atm

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Answer:

Both objects are in physical contact with each other

Explanation:

Conduction refers to the flow of heat from one object to another when the both objects are in contact with each other.

Hence, before heat can flow from one object to another, the two objects must be in contact with each other. This is a key requirement before conduction can take place.

Answer:

tendinitis.

carpal tunnel syndrome.

osteoarthritis.

rheumatoid arthritis (RA)

fibromyalgia.

bone fractures.

Answer:

B holding together molecules in a material

Explanation:

Intermolecular forces are primarily responsible for holding together molecules in a material due to the fact that they are interactive forces between molecules

The conditions of temperature and pressure in which a sample of CO₂ (g) would behave least like an ideal gas are high temperature and high pressure; 150°C and 300 kPa, option C

An ideal gas is any gas whose molecules obey the gas law and whose behavior follows the ideal gas behavior.

The behavior of ideal gases is as follows:

For a given gas to behave as an ideal gas, it must be under conditions of extremely high temperatures and low pressure.

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A conjugate acid-base pair is the pair of two compounds which differ by the presence of a proton. An acid will donate protons to a base and become a conjugate base. A base will accept protons and become a conjugate acid.Conjugate acid/base pairs are as follows:H2PO4− and HPO42−H2CO3 and CO32−HCl and Cl−H3O+ and OH−Explanation:

H2PO4− and HPO42−H2PO4− can donate a proton to become HPO42− and the latter can accept a proton to become H2PO4−.H2CO3 and CO32−H2CO3 can donate a proton to become CO32− and the latter can accept a proton to become H2CO3.HCl and Cl−HCl can donate a proton to become Cl− and the latter can accept a proton to become HCl.H3O+ and OH−H3O+ can donate a proton to become OH− and the latter can accept a proton to become H3O+.Therefore, the following are conjugate acid/base pairs:H2PO4− and HPO42−H2CO3 and CO32−HCl and Cl−H3O+ and OH−

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43.2 g of H₂0 would form when 4.8 g of Hydrogen reacts with 38.4 g of Oxygen.

Stoichiometry is defined as the relationship between reactants and products that are used to determine quantitative data.

It is the study of balanced chemical reactions.

To find the mass of the H20 form, we have to use stoichiometry.

First of all, we have to write a balanced chemical reaction

The reaction is as follows:

\(2H_2 + O_2 \rightarrow 2H_2O\)

The molar mass of O₂ = 32 g

The molar mass of H₂O = 18 g

According to the above reaction,

2 moles of Hydrogen react with 1 mole of Oxygen to form 2 moles of H2O

According to stoichiometry,

32 g of O₂ forms 36 g of H₂O

38.4 g of O₂ forms \(\frac{36 \times 38.4 } {32}\)of H₂O

                         = 43.2 g of H₂O

Thus, the mass of H₂Oform when 4.8 g of Hydrogen reacts with 38.4 g of Oxygen is 43.2 g

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molecule of the compound carbon dioxide consists of one atom of carbon and two atoms of oxygen, so carbon dioxide is represented by the chemical formula CO2.

Answer:

Isn't that carbon dioxide? I think it's C + O2 = CO2

The equation that depicts a single replacement reaction would be: Zn(s) + 2HCl(aq)→ ZnCl2​​​(aq) ​​​​+ H2(g)

They are also known as single displacement reactions.

They are reactions in which one element takes the place of another in a compound. That is, one element replaces another in a compound.

Looking at all the reactions from A - D, one can see that the only reaction that exemplifies a single replacement reaction is D.

Here, Zn replaced H in HCl.

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Answer:

Arsenic (As)

Explanation:

CH3 is the empirical formula for the compound.

A sample of a compound is determined to have 1.17g of Carbon and 0.287 g of hydrogen.

The number of atom or moles in the compound is

1.17 g C X  1 mol of C / 12.011 g C = 0.097411 mol of C.

0.287 g H x 1 mol of  H / 1 g H = 0.28474 mol H.

This compound contains 0.097411 mol of carbon and 0.28474 mol of Hydrogen.

So we can represent the compound with the formula C0.974H0.284.

Subscripts in formulas can be made into whole numbers by multiplying the smaller subscript by the larger subscript.

we can divide 0.284 by 0.0974.

0.284 / 0.0974 = 3.

So here, Carbon is one and hydrogen is 3.

We can write the above formula as a CH3.

Hence the empirical formula for the sample compound is CH3.

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The name of the process shown in the diagram is of filtration which is a separation technique.

Filtration is defined as a process by which solid particles which are present in liquid or gaseous medium are allowed to be removed using a filter medium which retains the particles but allows the liquid to pass through.

The requirements for filtration are a filter medium ,fluid containing particles , a mechanical device usually a filter and a driving force.The filter media is classified depending on the pore size of particles which are to be filtered.

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In an experiment, the molar mass of the compound was determined to be 118. 084 g/mol. The molecular formula of the compound is:C2H4O2.

To determine the molecular formula of a compound, one should know the empirical formula of the compound and its molar mass. The molecular formula of a compound indicates the actual number of atoms of each element present in one molecule of the compound. The empirical formula, on the other hand, indicates the simplest whole number ratio of the atoms of each element in a compound.The steps for finding the molecular formula of a compound, given its empirical formula and molar mass, are as follows:Step 1: Find the empirical formula of the compound.Step 2: Find the empirical formula mass of the compound.Step 3: Divide the molar mass of the compound by its empirical formula mass to determine the multiplying factor.Step 4: Multiply each subscript in the empirical formula by the multiplying factor to obtain the molecular formula of the compound.Given that the molar mass of the compound is 118.084 g/mol, we have;The empirical formula mass of the compound = (2 × 12.01 g/mol) + (4 × 1.01 g/mol) + (1 × 16.00 g/mol)= 72.07 g/molThe multiplying factor = 118.084 g/mol ÷ 72.07 g/mol ≈ 1.64Rounding off to the nearest whole number gives;The multiplying factor = 2Therefore, the molecular formula of the compound is:C2H4O2.

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The correct statement about the behavior of gaseous H₂ molecules in a container at 1 atm and 298 K is: (II) The H₂ molecules are colliding more frequently with the walls of the container than they would in the same container at 398 K.

Statement I is incorrect. In a gas at a given temperature, the molecules have a range of speeds following a distribution known as the Maxwell-Boltzmann distribution. Not all H₂ molecules are moving at the same speed. Instead, they have a distribution of speeds, with some moving faster and some moving slower.

Statement II is correct. According to the kinetic theory of gases, the frequency of molecular collisions with the walls of the container is directly related to the temperature.

At a lower temperature of 298 K compared to 398 K, the H₂ molecules will collide with the walls of the container more frequently because their average kinetic energy and speed will be lower.

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When 7.50 g of CH4(g) reacts completely with excess O2(g), approximately 416.3 kJ of thermal energy would be released.

To determine the amount of thermal energy released, we need the balanced chemical equation for the reaction and the heat of combustion (∆H) of CH4. The balanced equation is:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
The heat of combustion of CH4 is -890 kJ/mol. Now, we need to convert the mass of CH4 to moles and then calculate the released energy.
First, calculate the moles of CH4:
7.50 g CH4 × (1 mol CH4 / 16.04 g CH4) = 0.4675 mol CH4
Now, multiply the moles of CH4 by the heat of combustion:
0.4675 mol CH4 × (-890 kJ/mol) = -416.3 kJ

Summary: When 7.50 g of CH4(g) reacts completely with excess O2(g), approximately 416.3 kJ of thermal energy would be released.

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The balanced redox reaction can be separated into two half-reactions: the oxidation half-reaction and the reduction half-reaction. Oxidation half-reaction: 2Cl^- → Cl2 + 2e^-, Reduction half-reaction: Cl2 + 2e^- → 2CuCl

In the oxidation half-reaction, chloride ions (Cl^-) are oxidized to form chlorine gas (Cl2) and release two electrons (2e^-). This represents the loss of electrons, which is characteristic of an oxidation process. In the reduction half-reaction, chlorine gas (Cl2) gains two electrons (2e^-) to form copper chloride (CuCl). This represents the gain of electrons, which is typical of a reduction process. When combined, the two half-reactions form the overall balanced redox reaction: 2Cl^- + Cl2 → 2CuCl.

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Answer:

their outer electron shell is full

Explanation:

they are named noble because they are non-reactive

The noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.

Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Electrons are fundamental to many physical processes, including gravity, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity.

Noble gases are defined as any of a class of extremely stable, very slow-reacting rare gases, such as helium, neon, argon, krypton, xenon, and typically radon. In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. They are known as noble gases because of how beautiful they are and how little they generally react with anything. For this reason, they are also referred to as inert gases. The outer shell of the noble gas are completely filled.

Thus, the noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.

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Answer:

You can test whether or not the object is more or less dense than what by having, “80mL” (as long as the amount of water is easy to read and doesn’t overflow). You take all the object you want to test for, slowly and carefully drop the object into the water. If the Object sinks it is more dese and if it floats it is less dense. To find the exact density of the tested objects look at how much water is being displaced in the container and subtract the amount of water from that to get volume. Then, (or before putting the object into water) weight the object to find its mass. Next you divide the mass in mL by the volume to get the exact density.

Explanation: