Iron is an example of :
A. heterogeneous mixture
B. pure substance
C. Homogeneous mixture
D. solution

The correct IUPAC name for the molecule is option c) 4,6,7-tetramethylnonane.

To name the molecule, we start by identifying the longest continuous carbon chain, which in this case contains nine carbon atoms. We number the chain from the end that gives the substituents the lowest possible numbers, which gives us the numbering 1-2-3-4-5-6-7-8-9.

The molecule has three branches: a propyl group on carbon 5, an ethyl group on carbon 2, and a methyl group on carbon 3. We name these branches as substituents and indicate their positions with their respective numbers. Therefore the correct IUPAC name for the molecule is 4,6,7-tetramethylnonane.

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The mole fraction of NaCl in  a mixture : 0.195

The mole fraction shows the mole ratio of the compound to the moles of the mixture/solution

Can be formulated :

\(\tt x_1=\dfrac{n_1}{n_{tot}}\)

n tot = n₁+n₂+....nₙ

a mixture of 0.564 g NaCl, 1.52 g KCI, and 0.857 g LiCl

\(\tt \dfrac{0.564}{58,44 g/mol}=0.0097\)

\(\tt \dfrac{1.52}{74.55}=0.02\)

mol LiCl(MW=42,394 g/mol)

\(\tt \dfrac{0.857}{42,394 g/mol}=0.02\)

n total =

\(\tt 0.0097+0.02+0.02=0.0497\)

the mole fraction of NaCl :

\(\tt \dfrac{0.0097}{0.0497}=0.195\)

Answer:0.192 for acellus

Explanation:

Heat packs are used to relax muscles. This reaction is an example of exothermic reaction.

Exothermic reaction is defined as a reaction that is chemical in nature and is characterized by the release of energy in the form of heat and light.

It can also be defined as a thermodynamic process or reaction that releases energy from system to its surroundings.

Endothermic reaction is defined as the chemical reaction in which the reactants absorbs heat energy from the surroundings to form product.  

Endothermic reaction can also be defined as a reaction in which the system absorbs energy from its surroundings in the form of heat.

Being endothermic enables us to live in cooler environments and regulate our body temperatures in order to fight infection.

Thus, heat packs are used to relax muscles. This reaction is an example of exothermic reaction.

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The presence of atoms provides an explanation for the conservation of matter since they are the smallest units of matter that nevertheless retain the chemical characteristics of the element they represent.

Atoms can only be rearranged into different combinations to produce new compounds because they are indivisible and cannot be created or destroyed.

The law of conservation of matter, which asserts that the overall amount of matter in a closed system stays constant even when individual atoms and molecules may be rearranged by chemical interactions, is based on the concept of indestructible atoms.

In other words, a system has the same number of atoms both before and after a chemical reaction, and its overall mass is constant. The law of conservation of matter holds true for all chemical reactions, which is made possible by the fact that atoms are indivisible and cannot be generated or destroyed.

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Answer:

Explanation:

it should be more electro-negative  

than hydrogen and  it should be small sized atom  

The molecules who fulfill these needs are  

oxygen, nitrogen and fluorine.

73.40%

To express the efficiency of a reaction, you can calculate the percent yield using this formula: %yield = (actual yield/theoretical yield) x 100.

Answer

Explanation

Note: The reaction is a double replacement reaction in which two soluble ionic compounds react in an aqueous solution to form an insoluble solid.

In this case, a solution of sodium carbonate, Na2CO3, will contain

The complete balanced equation that occurs when sodium carbonate is added to hard water is

Answer:

Reactants are substances that start a chemical reaction, and products are substances that are produced in the reaction

Explanation:

Hope This Helps

Number of (NH4)2SO4 molecules = 2.16 × 10^25 molecules / 2 = 1.08 × 10^25 (NH4)2SO4 molecules. There are approximately 1.08 × 10^25 molecules of ammonium sulfate in 35.8 moles of (NH4)2SO4.

To determine the number of molecules in 35.8 moles of ammonium sulfate ((NH4)2SO4), we need to use Avogadro's number, which states that there are 6.022 × 10^23 particles (atoms, molecules, or ions) in one mole of any substance.

The molecular formula of ammonium sulfate indicates that there are two ammonium ions (NH4+) and one sulfate ion (SO4^2-) in each molecule.

To calculate the number of molecules in 35.8 moles of (NH4)2SO4, we can follow these steps:

Determine the number of moles of (NH4)2SO4 by multiplying the given value by Avogadro's number:

Number of moles = 35.8 moles × (6.022 × 10^23 molecules/mole) = 2.16 × 10^25 molecules

Since each molecule of (NH4)2SO4 contains one ammonium ion and one sulfate ion, the number of molecules can be divided by two to obtain the number of (NH4)2SO4 molecules:

Number of (NH4)2SO4 molecules = 2.16 × 10^25 molecules / 2 = 1.08 × 10^25 (NH4)2SO4 molecules

Therefore, there are approximately 1.08 × 10^25 molecules of ammonium sulfate in 35.8 moles of (NH4)2SO4.

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Answer: Average global temperature might increase. Certain parts of the earth would be toast and the rest would be melting.

Explanation: Because carbon dioxide in the atmosphere prevents some radiation from Earth's surface from escaping to space.

During chemical reaction, the total mass and total number of atoms remain conserved according to the law of conservation of mass and this clearly means that the total mass of reactants is same as the total mass of products. But the arrangement and properties of the atoms may change as a result of the reaction.

1. Word equation: Lead + Ferrous sulphate → Lead(II) sulphate + Iron

Unbalanced chemical equation: Pb + FeSO₄ → PbSO₄ + Fe

2. Word equation: Potassium phosphate + Barium chloride → Barium phosphate + Potassium chloride

Unbalanced chemical equation: K₃PO₄ + BaCl₂ → Ba3(PO₄)₂ + KCl

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Answer:

i know im painfully late but the answer is "the saturation point of a solution is measured in moles."

Explanation:

The relationship between concentration and mole is the number of particles of solute in a solution measured in terms of moles. Therefore,  option (D) is correct.

The mole is used to calculate the quantity amount of any substance. Moles of any substance can be determined by dividing the mass of the substance by its molar mass. Mole is useful to determine how many solute particles are present in a given solution.

Moles and molar mass are related to each other, as the concentration of substances can be calculated by using the number of moles of the solute.

The concentration of a solution is a measurement of the amount of solute per unit volume of solution. In chemistry, concentration is most commonly expressed in terms of molarity, which is equal to moles per liter solution.

Therefore, the correct option is option D.

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Answer:

protons

Explanation:

hjejdjkdndknfodjdodjbdld

Answer: Weather currents change wind tempature and there for change the weather of the seasons.

Answer:

We round numbers so we can find an answer or an estimate that will be close to the actual answer. Rounding numbers is also another way to get close to an exact answer without the trouble of having to calculate every number.

Answer:

Rounding numbers make the numbers easier and more simple to use . Though they may less accurate because of the changes number . Rounding is mainly used for estimates

Answer:

You can observe a real-life application of Boyle's Law when you fill your bike tires with air. When you pump air into a tire, the gas molecules inside the tire get compressed and packed closer together. This increases the pressure of the gas, and it starts to push against the walls of the tire.

Tyres of untouched vehicles get deflated during freezing winter days while get inflated in hot summer days. This unusual behaviour is because of Charles's law. In winter due to low temperatures, the air inside a tyre gets cooler, and they shrink. While in hot days, the air expands with temperature.

Another common example of Avogadro's law is the deflation of automobile tyres. When the air trapped inside the tyre escapes, the number of moles of air present in the tyre decreases. This results in a decrease in the volume occupied by the gas, causing the tyre to lose its shape and deflate.

Explanation:

The wavenumber of the R-branch line with J = 2 is 50.16 cm^(-1). The Morse potential-energy function describes the potential energy (V) of a diatomic molecule with parameters De (dissociation energy), Re (equilibrium bond length), and a (width parameter).

For the first question:

The wavenumber (ν) of the R-branch line originating from the rotational state with J = 2 can be calculated using the formula:

ν = 2B(J+1)

where B is the rotational constant.

Given that the rotational constant (B) of H81Br is 8.360 cm^(-1), we can substitute the values into the formula:

ν = 2 * 8.360 * (2+1)

ν = 2 * 8.360 * 3

ν = 50.16 cm^(-1)

So, the wavenumber of the R-branch line originating from the rotational state with J = 2 is 50.16 cm^(-1).

For the second question:

The Morse potential-energy function is given by VR(R) = De {1 - e^(-a(R-Re))}^2

- De is the dissociation energy, which represents the energy required to dissociate the molecule completely into its constituent atoms.

- Re is the equilibrium bond length, which represents the internuclear separation at which the potential energy is minimized.

- a is the "width" parameter, which determines the steepness of the potential energy curve near the equilibrium position.

In the sketch of the function, the potential energy (V) is plotted against the internuclear separation (R). At R = Re, the potential energy is at its minimum (De). As R deviates from Re, the potential energy increases, and the curve becomes steeper as determined by the value of a.

De, Re, and a are important parameters in the Morse potential-energy function as they describe the shape and behavior of the potential energy curve for a diatomic molecule. They provide insights into the stability, bond strength, and bonding characteristics of the molecule.

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Answer:

The gases which dissolve in water by diffusion are carbon dioxide and oxygen.

Explanation:

HAVE A GOOD DAY!

The product of a synthesis reaction between magnesium metal and nitrogen gas is magnesium nitride (Mg3N2).

In a synthesis reaction, two or more reactants are combined to form a new, more complex product. When magnesium metal reacts with nitrogen gas, the magnesium donates electrons to the nitrogen atoms, forming a strong covalent bond and resulting in the formation of magnesium nitride. The reaction can be represented by the following equation:

                                    3Mg + N2 ⇒ Mg3N2

Magnesium nitride (Mg3N2) is a chemical compound made up of magnesium and nitrogen. It is a white solid that is used in a variety of industrial and scientific applications, such as in the production of high-strength, lightweight alloys for the aerospace and automotive industries, and as a catalyst in chemical reactions.

The synthesis of magnesium nitride from magnesium metal and nitrogen gas is a typical example of a synthesis reaction, where two or more simple substances are combined to form a more complex product. In this reaction, magnesium metal reacts with nitrogen gas to form magnesium nitride. The reaction is exothermic, releasing heat, and is usually performed at high temperatures (around 800-1000°C) in a sealed container under an inert atmosphere to prevent the formation of unwanted by-products.

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Answer:

Explanation:

Al(ClO2)3

Answer:

75 g/dm³

Explanation:

The following data were obtained from the question:

Mass of solute (NaCl) = 15 g

Volume of solution = 200 cm³

Concentration (in g/dm³) =?

Next, we shall convert 200 cm³ to dm³. This can be obtained as follow:

1000 cm³ = 1 dm³

Therefore,

200 cm³ = 200 cm³ × 1 dm³ / 1000 cm³

200 cm³ = 0.2 dm³

Thus, 200 cm³ is equivalent to 0.2 dm³.

Finally, we shall determine the concentration of the solution as follow:

Mass of solute (NaCl) = 15 g

Volume of solution = 0.2 dm³

Concentration (in g/dm³) =?

Concentration (in g/dm³) = mass / volume

Concentration (in g/dm³) = 15 g /0.2 dm³

Concentration (in g/dm³) = 75 g/dm³

The sample size that will yield a margin of error within 4.7 of the population mean is 104.

A standard deviation (or σ) is a measure of how dispersed the facts is in terms of the suggestion. Low popular deviation method records are clustered around the imply, and excessive well-known deviation shows statistics are more spread out.

The same old deviation is a degree of the quantity of variant or dispersion of a hard and fast of values. A low fashionable deviation indicates that the values tend to be near the mean of the set, whilst a high general deviation indicates that the values unfold out over a much broader variety.

Calculation:-

z = 2.576

σ = 18.22

E = z* (σ / √n )= 4.7

4.7 =  2.576 × ( 18.22 / √n )

√n =   2.576 × ( 18.22 / 4.7 )

√n = 10.2032

n = 104.105

n ≅ 104

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Answer:

This means that the wave is bigger because amplitude is the hight of the crest of the wave!

Explanation:

SO IT MEANS THE WAVE IS BIGGER AND TALLER :D

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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Answer:

i belive the answer is A if it's not i am very sorry

Answer:

False

Explanation:

Answer:

False

Explanation:

The number of electrons determines the chemical properties.  

Answer:

las plantas

Explanation:

Las plantas son los seres vivos capaces de transformar energía luminosa utilizando agua y dióxido de carbono (CO₂) en energía química en forma de moléculas llamadas carbohidratos. El proceso a través del cual realizan esto se denomina fotosíntesis, y para ello requieren un pigmento de color verde denominado clorofila, el cual es necesario para captar la energía luminosa proveniente del Sol.