I need help as soon as possible please!!

Answer:

it cleans water and kills the germs

To write both values of ival and fval to standard output in the specified format, you can use the following code snippet:

#include <iostream>

int main() {

   int ival = 5;

   float fval = 2.4;

   std::cout << "i: " << ival << ", f: " << fval << std::endl;

   return 0;

}

This code snippet will output the following:

The code snippet provided above is a simple example of how to write two values to standard output in the specified format. However, there are many other ways to achieve the same result. For example, you could use the C++ iomanip library to control the formatting of the output. Additionally, the same code can be written in other programming languages such as Python, Java, and JavaScript.

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The strongest intermolecular force is hydrogen bonding.

Ionic bonds and covalent bonds are atomic bonds, meaning they are intramolecular. They are generally stable and relatively irreversible.

Hydrogen bonds, dipole-dipole interactions, and van der Waals forces (London dispersion forces) are some common examples of intermolecular forces. Intermolecular forces will never change the identity of the molecule and cannot be used to add atoms to a compound.

The strongest intermolecular force is hydrogen bonding, which is a particular subset of dipole-dipole interactions that occur when hydrogen is in close proximity to a highly electronegative element. The hydrogen takes on a partial positive charge and the electronegative atoms take on a partial negative charge.

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The following statement that correctly describes a Lewis acid-base reaction is that the base donates an electron pair to the acid.

Acid-base is a chemical reaction involving acid and base reactants. It can be used in determining the pH.

According to Lewis, an acid is a substance that accepts an electron pair. While a base is a substance that donates or donates electron pairs. The electron transport causes acids and bases to react, resulting in a coordinated covalent bond.

Lewis's acid-base theory is able to explain the acid-base properties of molecules or ions that have lone pairs of electrons or that can accept lone pairs of electrons, such as in the formation of complex compounds.

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Answer:105.8784

Explanation: I'm not good at explaining things because all I did was add the two numbers together.

The volume in mL of the silver nitrate (AgNO₃) stock solution that the chemist should pour out is 281 mL.

Volume (V₁) = 775 mL

Molarity (M₁) = 140 mM = 140 / 1000 = 0.140 M

Molarity (M₂) = 0.386 M

Volume (V₂) = ?

By the formula,

M₁V₁ = M₂V₂

V₂ = (M₁V₁)/M₂

Substitute the values to obtain volume (V₂),

V₂ = (0.140 M × 775 mL)/0.386 M

⇒ V₂ = 108.5/0.386

⇒ V₂ = 281.0 mL

Hence, the volume in mL of the silver nitrate (AgNO₃) stock solution that the chemist should pour out is 281 mL.

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The compounds that are listed on the table are molecular compounds.

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A certain substance, X, decomposes. 75 % % of X remains after 100 minutes. How much X remains after 200 minutes if the reaction order with respect to X is zero order.

The term zero order reaction is defined as  those in which the concentration of the reactants does not change over time and the concentration rates remain constant.

Zero Order: t(1/2) = [A]o/(2*k),

Therefore, k = [A]o/(2 * t(1/2)), where t(1/2) = 100 min. and [A]o=100% So incorporate condition.

A= - .0005 x 200 mins+1 of introductory fixation approaches zero percent.

Initially Order: Half-life condition k=.00693 remaining with 100 mins half life

Coordinate condition lnx= - .00693x200mins + ln 1 squares with lnx= - 1.386.

Take to the e to counteract ln so x=.25 or 25%

Second Order Initial Concentration of 1, half-existence of 100 mins.

K= .01.

Coordinate condition 1/x = .01 x 200 +1. X

= 33.3%

Thus, A certain substance, X, decomposes. 75 % % of X remains after 100 minutes. How much X remains after 200 minutes if the reaction order with respect to X is zero order.

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The various interactions for the substances in question are listed below.

1) Oxygen gas (O₂) and water have dipole - induce dipole interaction.

2) Sodium ion and water have ion - dipole force.

3) HCl and CH₃F have dipole - dipole force.

4) Ammonia and water have hydrogen bonding.

Intermolecular forces (IMF) are defined as that of the attractive as well as repulsive forces which thus arise between the molecules in a substance.

Hydrogen bonding would be defined as that of the interaction of a hydrogen atom among both two other atoms with a high affinity for electrons; this bond is relatively weak than that of an ionic bond as well as covalent bond and even though powerful than van der Waals forces.

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The thickest contour lines are called index lines, and they are often numbered at some point along their length.

Index lines, which are the thickest contour lines, are frequently numbered along their length. The height above sea level is seen from this. 2. The thinner, more frequent intermediate lines are located between the index lines.

A curve that connects points of equal value and along which the function has a constant value is called a contour line for a two-variable function. In the three-dimensional graph of the function f, it is a section of the plane.

A contour line is a line drawn to indicate a dip or elevation of the ground on a topographic map. A contour interval is the vertical distance or elevation difference between two contour lines.

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'Protons and neutrons' is the true statement concerning elements.

What is proton and neutron ?

Protons are positively charged particles with a mass of approximately 1 amu. These positively charged particles are present in the Centre of the atom in the nucleus. Neutrons are electrically neutral particles which have the same mass as a proton.

Protons: Positively charged subatomic particles that reside in the nucleus. Neutrons: Neutrally charged subatomic particles that reside in the nucleus. Electrons: Negatively charged subatomic particles found in the electron shells surrounding the nucleus.

A neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. The particle derives its name from the fact that it has no electrical charge; it is neutral.

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The work associated with the decomposition of TNT upon detonation can be determined by using the First Law of Thermodynamics.

According to the First Law, the change in internal energy (ΔU) of a system is equal to the heat added to the system (q) minus the work done by the system (w).

In this case, the reaction is exothermic and heat is released, meaning that q is negative. The work done by the system can be calculated using the equation:

w = -PΔV

where P is the pressure and ΔV is the change in volume is used to calculate the work done by the system.

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Answer:

Initial molarity of stock solution, M1 = 67.8um

Explanation:

I hope this helps!

Answer: d = 0.958 g/cm³

Explanation:

Density = mass/volume

d = g/cm³ or d = g/mL

Note: cm³ = mL

d = 43.0 g/4.80 cm³

d = 8.96 g/cm³

Three significant figures are in the final answer since there are three significant figures in 4.80 cm³ and 43.0 g.

The fact that oxygen is an atom that is strongly electronegative means that when forming a covalent bond with a less electronegative atom, it will pull the electrons more strongly than the less electronegative atom will, resulting in unequal sharing of electrons.

This unequal sharing of electrons means that the bond formed will always be ionic. Additionally, the ionic bond is usually the strongest type of bond, and it can be difficult to break the bond. This makes ionic bonds ideal for holding molecules together or for creating strong materials.

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2 moles of CaSO4 are required to produce 128 g of SO2 in 3CaSO4 + CaS → 4CaO + 4SO2 in this equation.

The term mole is defined as a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

1 mole = 6.023 × 10²³ molecules

The balance equation is as follows:

3CaSO4 + CaS → 4CaO + 4SO2

1 mole = 6.023 × 10²³ molecules

1 mole SO₂ = 6.023 × 10²³ molecules

128 mole = ?

Molar mass of SO₂ = 64 gram

The numbers of moles in 128 gram SO₂ = 1 / 64 ×128

= 2 moles

Thus, 2  moles of CaSO4 are required to produce 128 g of SO2.

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Option (C) is correct. Evaporation of liquid water increases the entropy of the system.

Entropy of the system can be defined as the measure of disorders of molecules in a system. The molecules starts moving randomly and with greater speed when water evaporates. That means disorders in the system has in creased. There is an increase in degrees of freedom over which energy can be expressed is going to mean an increase in entropy. The water molecule held by hydrogen bonds is going to be at both a lower energy and entropy state than a water molecule freed to express motion in many more axes. It interact with a greater number of other molecules by being evaporated.

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The complete question is,

Which of the following processes increases entropy of the system?

A. crystallization of water at 0°C

B. reaction NH3 + HCl → NH4Cl

C. evaporation of liquid water

The number of atoms of each element in a compound can be indicated by the number written on each element.

Steps to calculate the number of atoms:

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Answer:

The volume of an object is the amount of space it takes up. In this question, we know that the volume of the gold bar is 7.379 x 10^-4 m^3. We also know that the density of gold is 19.3 g/cm^3. To calculate the mass of the bar, we need to multiply the density of gold by the volume of the bar. The mass will be in grams.

Density = mass / volume

mass = density * volume

mass = (19.3 g/cm^3) * (7.379 x 10^-4 m^3)

mass = (19.3 g/cm^3) * (7.379 x 10^-4 m^3) * (10^6 cm^3/m^3)

mass = 140.4 g

So the mass of the gold bar is 140.4 g (rounded to 3 significant figures)

Simply demonstrating the components of a molecule using the empirical formula is common practice.

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Answer:

1.) The smallest unit of an element that maintains the properties of the element is an atom.

2.) All compounds are molecules, but not all molecules are compounds.

A compound is a substance formed by the chemical combination of two or more elements in fixed proportions. Compounds have distinct properties that are different from those of their constituent elements.

A molecule is a group of two or more atoms held together by chemical bonds. Molecules can be made up of a single type of atom (such as O2 or N2) or a combination of different elements (such as H2O or CO2). Not all molecules are compounds, as some can be made up of a single type of atom.

3.) Mixtures that look the same throughout and have the same composition and properties in all parts of the mixture are called homogeneous mixtures. An example of a homogeneous mixture is salt water, where the salt is evenly dispersed in the water and cannot be seen or felt as separate particles. Other examples of homogeneous mixtures include air, sugar in water, and gasoline.

4.) A heterogeneous mixture that has particles that will mix but slowly settle out is called a suspension. In a suspension, the particles are large enough to scatter light, making the mixture appear cloudy or murky. The particles in a suspension are not evenly distributed throughout the mixture and will eventually settle to the bottom if left undisturbed for a period of time. Examples of suspensions include muddy water, orange juice with pulp, and paint.

5.) Mixtures that look different throughout and have varying composition and properties in different parts of the mixture are called heterogeneous mixtures. An example of a heterogeneous mixture is fruit salad, where different types of fruit are physically combined but remain distinct and can be separated from each other. Other examples of heterogeneous mixtures include granola, a pile of mixed rocks, and a glass of ice water with ice cubes floating in it.

6.) A heterogeneous mixture that has large particles that do not stay mixed is called a colloid. In a colloid, the particles are larger than those in a solution, but smaller than those in a suspension, and are evenly dispersed throughout the mixture. Colloids often appear homogeneous, but the particles will separate if the mixture is left undisturbed for a period of time. Examples of colloids include milk, fog, and whipped cream.

7.) A chemical change is a process in which a substance undergoes a transformation to produce one or more new substances with different chemical properties. In a chemical change, the original substances are broken down and rearranged into new substances, resulting in a permanent change. The substances produced in a chemical change cannot be easily reversed to their original form. Examples of chemical changes include burning, rusting, digestion, and rotting.

8.) A molecule is a group of two or more atoms held together by chemical bonds. When atoms bond together to form molecules, they create new substances with unique chemical and physical properties. Examples of molecules include water (H2O), carbon dioxide (CO2), and glucose (C6H12O6). These molecules are composed of chemically combined particles (atoms) that can no longer be separated into individual atoms by physical means.

9.) A substance made up of different kinds of atoms chemically combined is called a compound.

10.) Yes, mixtures can be classified based on particle size.

In general, mixtures can be classified into three categories based on particle size: solutions, suspensions, and colloids.

A solution is a homogeneous mixture of two or more substances, where the particles are small enough to be evenly dispersed throughout the mixture, giving it a uniform appearance.

A suspension is a heterogeneous mixture of larger particles that will eventually settle out if left undisturbed.

A colloid is a heterogeneous mixture with particles that are larger than those in a solution, but smaller than those in a suspension. Colloids appear homogeneous, but the particles will separate over time if left undisturbed.

This classification based on particle size is useful for understanding the behavior and properties of mixtures, as well as for separating and purifying substances.

11.) Physical changes.

12.) The substance that is dissolved to make a solution is called the solute.

13.) Homogeneous mixtures that have small particles that completely dissolve in one another are called solutions.

14.) The substance that does the dissolving in a solution is called the solvent.

15.) The substance made of elements and compounds that are not chemically combined is called a mixture.

16.) A technique used to separate a mixture of different liquids with different solubilities is called liquid-liquid extraction.

17.) A type of mixture that does have a uniform composition is called a homogeneous mixture.

18.) Elements and compounds are examples of pure substances.

P.S. I hope you learned something!

The Number of atoms per unit cell for Ga = 4 atoms per unit cell. Number of atoms per unit cell for As = 4 atoms per unit cell. Volume density of Germanium in its unit cell = 4.35 × 10²² /cm³

According to published data, GaAs has a number density of 4.42 x 10²²atoms/cm³.

Because it is well known that Ga and As are essentially equally distributed throughout GaAs.

Ga's number density is equal to As's number density (2.21 x 10²² atoms/cm³).

Volume of the unit cell = (lattice parameter)³ = (5.65 × 10⁻⁸)³ = 1.804 × 10⁻²² cm³

a) Number of atoms per unit cell for Ga and As = number density × volume of unit cell = 2.21 × 10²² × 1.804 × 10⁻²² = 4 atoms/unit cell

b) Volume density = Number of atoms per unit cell/volume of unit cell

A germanium unit cell contains 8 atoms (from literature)

Volume of unit cell = (lattice parameter)³ = (5.65 × 10⁻⁸)³ = 1.804 × 10⁻²² cm³

Volume density = 8/(1.804 × 10⁻²²) = 4.35 × 10²² /cm³

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The actual yield divided by the hypothetical yield multiplied by 100 is known as percent yield.  The percent yield is  68.04 %.

The percent yield is the difference between the actual yield and the hypothetical yield multiplied by 100.

A number of factors, which will be discussed in more detail in later chapters of the course, can cause a chemical reaction's actual yield to be lower than its theoretical yield.

The percentage yield of a chemical reaction indicates the efficiency of that reaction.

It provides us with information about the percentage of our reactants that successfully transformed into a product in terms of percentages.

[tex]Ca_5(PO_4)_3F + 5H_2SO_4 + 10H_2O $\rightarrow$ 3H_3PO_4 + 5CaSO_4.2H_2O + HF[/tex]

 504.3 g                                                          294 g

 1 x 103 g                                                              ??

[tex](504.3 g ) Ca5(PO_4)_3F \rightarrow H_3PO_4 (294 g)[/tex]

1000 g [tex]Ca5(PO_4)3F \rightarrow[/tex]      ??

theoretical yield of H2PO4 = "[tex]1000\ \times \frac{294}{504.3}[/tex]

                                        = 582.986 g

actual yield = 396 g

percent yield = [tex]"\frac{396}{582}\times 100"[/tex]

                   ="percent yield = 68.04 %"

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The definitive word for each of the given sentences is as follows:

A microprocessor is a compact and integrated chip that contains the central processing unit (CPU) of a computer. Alan Turing was a British mathematician and computer scientist who played a crucial role in breaking the German Enigma code during World War II. A vacuum tube, also known as a valve, is an electronic component consisting of a glass or metal tube with electrodes sealed inside.

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Answer:

cpu , al , vaccum tube

Explanation:

100% on edge

143 millilitres of ethanol have a mass of 113.397 grammes.

The volatile, transparent liquid ethanol, usually referred to as ethyl alcohol, is frequently employed as a solvent in lab settings. It has a density of 0.789 grammes per millilitre and the chemical formula C2H5OH, making it an organic substance.

We can determine the mass of a given volume of a substance since its density is defined as its mass per unit volume.

We only need to multiply the density by the volume of the ethanol to determine its mass, which is 143 millilitres. This calculation's formula is:

Volume times Density = Mass

When we enter the ethanol values, we obtain:

mass = 143 ml x 0.789 g/ml = 113.397 g

Therefore, 143 millilitres of ethanol have a mass of 113.397 grams.

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The Complete  rate law for this reaction is Rate =k[NO]²[H2].

The rate of reaction, also known as reaction rate, is the rate at which reactants transform into products. It should go without saying that different chemical reactions occur at different rates. While certain chemical reactions take place extremely immediately, others usually take some time to reach their final equilibrium.

The rate at which a chemical reaction proceeds is known as the reaction rate. The concentration of a reactant that is consumed in a unit of time or the concentration of a product that is produced in a unit of time are two common ways to define it (amount per unit volume).

v₀= k [A]ₓ [B]ₐ

v₀ = rate

k = rate constant

A = concentration of species A

ₓ = order of reaction with respect to A

B = concentration of species B

ₐ = order of reaction with respect to B

so,

2 NO + 2 H₂ ⇒ N₂ + 2 H₂0

V₀ =k[NO]²[H2].

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