The mass of an atom is determined by the number of protons the element has. The more protons, the heavier the element.

True or False

Answer:

HCl acts as an excess reagent

Explanation:

The reaction equation is;

PbO + 2HCl → PbCl2 + H20

Number of moles of PbO = 13g/223.2 g/mol = 0.058 moles

Since the mole ratio is 1:1, 0.058 moles of PbCl2 is produced

Number of moles of HCl = 6.4 g/36.5g/mol = 0.175 moles

2 moles of HCl yields 1 mole of PbCl2

0.175 moles yields 0.175 moles * 1/2

= 0.0875 moles of PbCl2

Hence; PbO yields the least number of moles of product so it is the limiting reactant and HCl is the reactant in excess

Answer:

i think the answer is C

Explanation:

if wrong im sorry

The content that is a solid solute can be determined using the provided solubility curve by looking at the locations where the solubility curve crosses along the temperature axis.

The saturation point at which no more solute can dissolve in the solvent is represented on the supply solubility curve by the places where the curve crosses the temperature axis. At these saturation points the solute is in its solid state as its solubility in the particular solvent becomes maximum.

Based on the solubility curve, the solid solute content can be identified as follows: Substance A is a solid solute in the specified solvent because the solubility curve cuts the temperature axis at the point where it lies.

Therefore, the correct option is C.

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Doubling the atmospheric CO₂ concentration then C₃ plants has faster growth rate

CO₂ level are usually measured in percent of air or part per million and because of CO₂ the plants can maintain high photosynthetic rates with relatively low stomatal conductance and it has been suggested that increase CO₂ will increase water use efficiency of C₃ species because it caused a reduction in transpiration rate and an increases in CO₂ assimilation rate of the plant and C₃ would have faster growth rate and C₄ would be minimally affected

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Answer:

that it i think

Explanation:

the earth revolves around the Sun once each year and spins on its axis of rotation once each day. This axis of rotation is tilted 23.5 degrees relative to its plane of orbit around the Sun. The axis of rotation is pointed toward Polaris the North Star. As the Earth orbits the Sun the tilt of Earth’s axis stays lined up with the North Star.

The correct answer for the redox reaction is D. Pb(s) + 2 Ag⁺(aq) → Pb₂⁺(aq) + 2 Ag(s). This is a complete redox reaction for a Pb/Pb₂⁺ || Ag⁺/Ag cell.

The cell consists of two half-cells, an anode (Pb/Pb₂⁺ half-cell) and a cathode (Ag/Ag⁺ half-cell).

In the anode half-cell, lead (Pb) is oxidized to form lead ions (Pb₂⁺) and two electrons (e⁻). The half-cell reaction is represented as Pb(s) → Pb₂⁺(aq) + 2 e⁻.

In the cathode half-cell, silver ions (Ag⁺) are reduced to form silver (Ag) and one electron (e⁻). The half-cell reaction is represented as Ag⁺(aq) + e⁻ → Ag(s).

When the two half-cell reactions are combined, the two electrons from the anode half-cell are transferred to the cathode half-cell, where they are used in the reduction of Ag+ ions. The overall balanced redox reaction for the cell is:

Pb(s) + 2 Ag⁺(aq) → Pb₂⁺(aq) + 2 Ag(s)

This reaction shows that lead is oxidized to form lead ions and silver ions are reduced to form silver. The oxidation and reduction reactions occur simultaneously in the two half-cells and result in the flow of electrons through the external circuit, generating an electric current.

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I think that the answer is D

Answer:The mass of a single water molecule can be calculated using its molecular formula, H2O. The molecular weight of water is 18.015 g/mol.If we have 3.01 x 10^24 water molecules, the total mass can be calculated as follows:Mass = Number of water molecules * Molecular weight of waterMass = 3.01 x 10^24 * 18.015 g/molMass = 5.45 x 10^25 gSo, the mass of 3.01 x 10^24 water molecules is approximately 5.45 x 10^25 grams.

Answer:

15.68 Joules

Explanation:

In physics, work is defined as the energy that is transferred to or from an object by a force that displaces that object some distance.  The SI unit for work is a Joule, which itself is defined as 1 kg*m^2/s^2.

The attached file explains the steps to cacluate work done in raising the 2 kg book 0.8m.

The glycosidic linkage of 2 glucose molecules changes the glucose from a monosaccharide into a disaccharide. A monosaccharide is a simple sugar, such as glucose, fructose, or galactose, that cannot be further hydrolyzed to yield smaller sugars.

In the case of glucose, when two glucose molecules undergo a condensation reaction, a glycosidic linkage is formed between the anomeric carbon of one glucose molecule and a hydroxyl group on the other glucose molecule. This results in the formation of a β-D-glucopyranosyl-(1→4)-β-D-glucopyranose molecule, which is also known as maltose.

Maltose is a reducing sugar, which means that it can undergo oxidation reactions and can be detected by tests such as the Benedict's test. It is commonly found in grains, such as barley and wheat, and is used in the production of beer and other fermented beverages.

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To calculate the mass of chloroacetic acid (ClCH2COOH) needed to produce 13.7 g of hydrogen chloride (HCl) gas during combustion, we need to consider the balanced chemical equation for the combustion reaction and use stoichiometry.

The balanced chemical equation for the combustion of chloroacetic acid is:

ClCH2COOH + O2 -> CO2 + H2O + HCl

From the equation, we can see that 1 mole of chloroacetic acid produces 1 mole of HCl. Therefore, we need to determine the molar mass of HCl to convert the given mass of 13.7 g into moles.

The molar mass of HCl is approximately 36.46 g/mol.

Now, we can calculate the number of moles of HCl:

Number of moles of HCl = Mass of HCl / Molar mass of HCl

Number of moles of HCl = 13.7 g / 36.46 g/mol ≈ 0.376 mol

Since the balanced equation indicates a 1:1 stoichiometric ratio between chloroacetic acid and HCl, the number of moles of chloroacetic acid required is also 0.376 mol.

Finally, we can calculate the mass of chloroacetic acid:

Mass of chloroacetic acid = Number of moles of chloroacetic acid × Molar mass of chloroacetic acid

Mass of chloroacetic acid = 0.376 mol × (molar mass of ClCH2COOH)

Using the molar masses of each element:

Molar mass of ClCH2COOH = (1 × atomic mass of Cl) + (3 × atomic mass of H) + (2 × atomic mass of C) + (2 × atomic mass of O)

To produce 13.7 g of hydrogen chloride gas during the combustion of chloroacetic acid (ClCH2COOH), approximately X g of chloroacetic acid is required. By following the stoichiometry of the balanced chemical equation and using the molar masses, the exact value can be calculated.

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The new concentration of the solution is 0.016 M

From the question, we are to determine the concentration of the new solution prepared from question 4.

NOTE: Question is provided below

From question 4, the concentration of the sodium chloride solution is 0.200M

Now, to determine the new concentration,

Using the dilution law

C₁V₁ = C₂V₂

Where

C₁ is the initial concentration

V₁ is the initial volume

C₂ if the final concentration

and V₂ is the final volume

Then,

C₁ = 0.200 M

V₁ = 10.00 mL
C₂ = ?

V₂ = 125.00 mL

Then,

0.200 × 10.00 = C₂ × 125.00

\(C_{2}= \frac{0.200 \times 10}{125.00}\)

C₂ = 0.016 M

Hence, the new concentration of the solution is 0.016 M

Question 4:

Calculate the amount of solid sodium chloride needed to make 200.00 mL of a 0.200 M solution

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The mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

From the question, we are to calculate the mass of 3.0 moles of ⁶³Cu atoms.

From the given information,

One ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

First, we will determine the number of atoms present in 3.0 moles of ⁶³Cu atoms

Using the formula,

Number of atoms = Number of moles × Avogadro's constant

Number of ⁶³Cu atoms present = 3.0 × 6.022 × 10²³

Number of ⁶³Cu atoms present = 18.066 × 10²³ atoms

Now, we will determine the mass  of 18.066 × 10²³ ⁶³Cu atoms

If 1 ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

Then,

18.066 × 10²³ ⁶³Cu atoms will have a mass of 18.066 × 10²³ × 1.045 × 10⁻²²

18.066 × 10²³ × 1.045 × 10⁻²² = 188.7897 g

≅ 188.8 g

Hence, the mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

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Answer: The magnitudes of the charges, currents, or magnetic strengths involved and the distances between the interacting objects.

Explanation: All moving charges give rise to a magnetic field and the charges that move through its regions, experience a force.

The electron configuration of a potassium atom at ground state is 1s²2s²2p⁶3s²3p⁶4s¹. Therefore, option D is correct.

The electron configuration of an element can be explained as electrons being occupied in different energy levels of an atom of a specific element. In the electron configuration, the electrons are usually written as a superscript of atomic subshells. For example, the electron configuration of Helium can be represented as 1s²2s².

The sequence of completely filled subshells similar to neighboring the electronic configuration of a noble gas is represented by square brackets. The principal quantum number (n) will be used to denote the maximum number of electrons in an electron shell.

The total number of electrons occupied in the given electronic configuration  1s²2s²2p⁶3s²3p⁶4s¹  is 19. The atomic number of potassium is 19 therefore it is the configuration of potassium.

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The molar mass of NaCl is 58.44 g/mol, and the molar mass of AgCl is 143.32 g/mol.

To find out how many grams of AgCl are produced from 78.00 g of NaCl, you can use stoichiometry and the balanced chemical equation for the reaction:

2 NaCl + AgNO3 → 2 NaNO3 + AgCl

From this equation, you can see that 2 moles of NaCl react with 1 mole of AgNO3 to produce 2 moles of NaNO3 and 1 mole of AgCl. Therefore, the mole ratio of NaCl to AgCl is 2:1.

To calculate the number of moles of NaCl in 78.00 g, you can divide the mass by the molar mass.

Mass is a fundamental physical quantity that measures the amount of matter in an object. It is commonly expressed in units such as grams (g) or kilograms (kg). The mass of an object is always constant, regardless of its location or the gravitational force acting on it. Mass is different from weight, which is the force exerted on an object due to gravity, and can vary with the strength of the gravitational field. The concept of mass is important in physics and other sciences, as it plays a fundamental role in determining the behavior of objects under various conditions, including acceleration, momentum, and energy.

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In the given reaction one mole or 143.32 g of silver chloride will be produced.

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A unit cell can be visualized as a building block that, when replicated in all directions, creates the entire crystal lattice. Unit cells can have different shapes, the most common types of unit cells include simple cubic, body-centered cubic, and face-centered cubic etc.

(a) Definition of a unit cell: A unit cell is the basic repeating unit of a crystal lattice. It represents the smallest portion of a crystal that, when stacked together, can generate the entire crystal structure.

(b) Sketch of a body-centered cubic (BCC) unit cell is represented in the image below. In the BCC unit cell, atoms are located at the eight corners of the cube and one atom is positioned at the center of the cube.

(c) Coordination number in a BCC unit cell: The coordination number is the number of nearest neighboring atoms surrounding a central atom. In a BCC unit cell, each atom is in contact with eight nearest neighboring atoms: one in the center of the unit cell and one at each of the eight corners.

(d) Calculation for the atomic packing factor (APF) of a BCC unit cell:

The APF is calculated as the volume occupied by the atoms in the unit cell divided by the total volume of the unit cell.

For a BCC unit cell, the APF can be calculated as follows:

APF = (Number of atoms in the unit cell * Volume of each atom) / Volume of the unit cell

In a BCC unit cell, there are two atoms (one at the center and one at the corner), and the volume of each atom can be approximated as (\(4/3\)) * π * \((radius)^3\). The volume of the unit cell can be calculated as the cube of the edge length.

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Molecular formular for C3H8O ( Isopropyl alcohol)

comprises of 3 Carbon, 8 Hydrogen and 1 oxygen ,

So, first box =3

second box = 8

third box = 1

emperical mass c3h80 =( 3*12) + (1*1) + (1*15.99) = 53.03 g/mole

Molecular formular = molecular weight / emperical mass

= 60.10g/mole /53.03g/mole = 1.133

if we multiply subscripts numbers ; we still get

Molecular formula = C3H8O

However, the second option doesnt have the option of 8 hydrogen .

The inlet pressure of the pipeline in (bar) is 6.7 bar. To calculate the inlet pressure of the pipeline, we can use the Darcy-Weisbach equation.

Darcy-Weisbach equation relates pressure drop, flow rate, pipe characteristics, and fluid properties. The equation is given as:

ΔP = (fLρV²) / (2D) where:

ΔP is the pressure drop

f is the Darcy friction factor

L is the length of the pipeline

ρ is the density of water

V is the velocity of water

D is the diameter of the pipeline

First, we need to convert the flow rate from m³/hr to m³/s:

Flow rate = 27 m³/hr = (27/3600) m³/s = 0.0075 m³/s

Next, we need to calculate the velocity of water:

Area of the pipeline =\(\pi \times \frac {(76/1000)^2}{4} = 0.004556 m^2\)

Velocity
= Flow rate / Area of the pipeline
= 0.0075 m³/s / 0.004556 m² = 1.646 m/s

Now, we can calculate the pressure drop using the Darcy-Weisbach equation. Since we need to calculate the inlet pressure, we assume ΔP is the difference between the outlet pressure and the inlet pressure:

ΔP = (fLρV²) / (2D)

\(\triangle P = \frac {(0.015 \times 4000 \times 1000 \times 1.646^2)}{(2 \times 0.076)} = 10.69 \times 10^5 Pa\)

= 10.7 bar (approx)

Rearranging the equation to solve for the inlet pressure:

Inlet pressure = ΔP - outlet pressure = 10.7 bar - 4 bar = 6.7 bar

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Answer:

the main cause of climate change is burning fossil fuels such as oil, gas, and coal. When burnt, fossil fuels release carbon dioxide into the air, causing the planet to heat up.

Explanation:

Answer:

maybe greece

Explanation:

by henry cavendish in 1766

Answer:

1120 mm Hg

plus give brainliest

the correct answer is dissapate...but it is

not here so i think relativly the answer is destroy

The bowling ball pendulum didn’t hit Bill Nye in the face because the amount of kinetic energy can never be more than the amount of potential energy, some of the energy is transferred to heat. This statement is true.

The bowling ball pendulum did not hit Bill Nye in the face because potential energy will always be greater than kinetic energy. When a force (a push or a pull) acts on something over a long distance, this occurs.

For instance, if the object is positioned at a higher height, its kinetic energy will be higher. Potential energy is not transferable and varies with object mass, height, and distance.

Thus, The bowling ball pendulum didn’t hit Bill Nye in the face because the amount of kinetic energy can never be more than the amount of potential energy, some of the energy is transferred to heat.

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Answer: option c) the strongest base in aqueous solution is NaOH

Explanation:

the strongest base in aqueous solution is NaOH because strength of a base is determined by its ability to donate hydroxide ions (OH-) in solution. and NaOH dissociates completely in water to produce Na+ and OH- ions. The presence of a fully dissociated hydroxide ion makes NaOH a strong base.

While, HOC2H4OH and CH3OH are weak acids. HOC2H4OH is ethylene glycol and CH3OH is methanol are weak acid due to the presence of the   (-OH) group.

Also, NH3 (ammonia), is a weak base though it can accept H⁺ to form NH4+

Answer:

Explanation:

Soil is composed of both biotic—living and once-living things, like plants and insects—and abiotic materials—nonliving factors, like minerals, water, and air. Soil contains air, water, and minerals as well as plant and animal matter, both living and dead.

The statement that soil contains only non-living things is false.

The soil is composed of water, minerals, organic matter, water, and air.

The average soil contains 45 percent minerals, 5 percent organic matter, 20-30 percent water, and 20-30 percent air.

These figures are, at best, approximations. In actuality, the soil is a complex and dynamic system.

Thus, the given statement is false.

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Answer:

C

Explanation:

The answer is C as concentration is a major factor affecting the rate of reaction and it has a direct relationship with the rate of reaction.

The effect that the concentration of reactants has on the rate of a reaction is increasing the concentration increases the rate of the reaction. The correct option is C.

A reactant is a part of a reaction that is the first part of the reaction. Reactant can be more than one in the reaction. The different reactant reacts, and form a totally different product.

H2 + O2 = H2O

The hydrogen and oxygen are the reactants of the reaction.

Thus, the correct option is C. Increasing the concentration increases the rate of the reaction, as concentration plays a significant role in determining the rate of reaction and is directly related to it.

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Answer:

a

Explanation:

A molecular ingredient that could be used in a wall-filling material is C₂₇H₃₆N₂O₁₀, is not a good thermal insulator, hence option A is correct.

The big molecule C₂₇H₃₆N₂O₁₀ is a poor thermal insulator. Since NeNa is a relatively reactive chemical, it would probably dissolve in water far too quickly. The acidic molecule HCl would dissolve far too quickly in water.

Not a good thermal insulator is C₂₇H₃₆N₂O₁₀. It is a big molecule composed of a lot of hydrogen atoms. Since hydrogen atoms are excellent heat conductors, they would be ineffective in stopping heat from passing through a material used to fill a wall.

Thus, the option (A) C₂₇H₃₆N₂O₁₀ is correct.

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Answer:

Explanation:

Mnemonic Device: Kings Hate Dragons Because Dragons Can't Make Money. Explanation: to remember the Metric prefixes, or the decimal ladder, and base unit (Kilo, Hecto, Deca, Base, Deci, Centi, Milli, Micro).