Steel is an alloy that is used in making strong roofs because of its enhanced mechanical and chemical properties. Do you consider steel to be more or less malleable than the elements that make it? Explain your answer. Use in your answer the term lattice energy.

mass of an atom is concentrated in the nucleus

Answer:

-1

Explanation:

The polymer of amino acid give different types of proteins. Poly means many. Therefore, the ribonucleotide polymer (5')GTGATCAAGC(3') could only form a double-stranded structure with: (5')GCTTGATCAC(3').

A polymer is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. The repeating subunit is called monomer. Monomer can be of same type or different type.

The linkage between units of amino acid is called peptide linkage or peptide bond. The ribonucleotide polymer (5')GTGATCAAGC(3') could only form a double-stranded structure with: (5')GCTTGATCAC(3').

Therefore, the ribonucleotide polymer (5')GTGATCAAGC(3') could only form a double-stranded structure with: (5')GCTTGATCAC(3').

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In the titration of a 25.6 ml sample of a 0.397 m aqueous hydrofluoric acid solution with a 0.406 m aqueous potassium hydroxide solution, the pH at the equivalence point is 8.21.

Given volume of sample (V) = 25.6ml = 0.0256L

Concentration of  aqueous hydrofluoric acid solution (M1) = 0.397M

Concentration of  aqueous potassium hydroxide solution (M2) = 0.406M

The concentration of fluoride ions will determine the pH at the equivalency point. During the titration, the reaction is

HF + KOH --> H2O + KF.

Since it is the conjugate base of a weak acid, the F- will have an impact on the pH of the solution rather than the K+ in solution.

F- + H2O <--> HF + OH- is the reaction at the equivalence point, and the fluoride ion's molarity is 0.0256 x 0.397 = 0.010 moles of HF = moles of KOH at the equivalence point = 0.010/0.406 = 0.0246L of KOH

At the equivalence point, the F-'s molarity will be equal to =  0.010/(0.0256+0.0246) = 0.199M

Additionally, the Kb for F- is required, and its values are as follows:

Kw/Ka = 1.0 x 10-14 / (6.6 x 10-4) = 1.5 x 10-11

pOH = -log (1.8 x 10-6) = 5.79

pH = 14-5.79 = 8.21

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Answer:

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore they rarely react with other elements since they are already stable

Answer:

try to give away its two outer electron to another atom

Explanation:

Answer:

See explanation

Explanation:

The seven elements that form diatomic molecules are:

Hydrogen (H) => H₂

Nitrogen (N) => N₂

Oxygen (O) => O₂        

Fluorine (F) => F₂

Chlorine (Cl) => Cl₂  

Bromine (Br) => Br₂

Iodine (I) => I₂    

How to remember the '7' diatomics => look at periodic table and draw a horizontal line starting at Nitrogen (N) through Fluorine (F), then a vertical line from Fluorine (F) through Astatine (As). The lines drawn make the number '7'. One only need to remember Hydrogen (H) also belongs to the set of elements forming diatomic molecules.

Analyze radioactive decay with the half-life calculator.

The half-life sign is t12. For instance, if 100 mg of a medication with a 60-minute half-life is consumed, the following is projected to occur: 50 mg remain 60 minutes after injection. After 120 minutes of ingestion, 25mg is still active.

Ordinarily, seconds are the unit. But it largely depends on the circumstance. If uranium-238 is brought up, you will be discussing a half life measured in the billions of years. In contrast, the half-life of a muon will be measured in seconds or microseconds.

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There is a golden role of solubility, polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, it was unable to diffuse through the 20 MWCO membrane.

Solutions are a homogeneous mixture of two or more substances. A solution is a homogeneous mixture of solvent and solute molecules. Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution. There are two types of mixture that is homogeneous and heterogeneous. Solution is a homogeneous solution.

Lee molecular weight of urea is 60.07 . It was unable to diffuse through the 20 MWCO membrane due to urea being unable to fit through the pores of the membrane.

Therefore, it was unable to diffuse through the 20 MWCO membrane.

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The neutral atom with a nuclear charge of +9 and a nuclear mass of 19 amu is fluorine-19. It has 10 neutrons and 9 electrons.

The atomic number of an element is equal to the number of protons in its nucleus. Therefore, if an atom has a nuclear charge of +9, it means it has 9 protons. The nuclear mass of an atom is the sum of its protons and neutrons. Since we know the nuclear mass of this atom is 19 amu, and it has 9 protons, it must have 10 neutrons (19 - 9 = 10).

To determine the number of electrons, we need to know the charge of the atom. Since it is a neutral atom, it has no net charge. This means the number of electrons must be equal to the number of protons, which is 9.

Therefore, the identity of the neutral atom is fluorine-19, with 9 protons, 10 neutrons, and 9 electrons.

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The third ball of 5 grams of mass will make the biggest crater in the sand because force is directly proportional to mass. so the greeter the mass, the greater its force and impact.

Mass is described as the quantity of matter in a physical body.

Mass is also a measure of the body's inertia, the resistance to acceleration when a net force is applied.

Mass is always known to be constant for a body. We can calculate mass by:

Mass = volume × density.

Weight is the measure of the gravitational force acting on a mass. The SI unit of mass is the "kilogram"

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Answer:

Explanation:

D. Vaporization occurs with liquid particles gain energy and "fly away" into a gas.

Think of when you're boiling something on the stove.

Answer:

Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.

Explanation:

please mark me brainliest and it was hard making an answer

Answer:

Una cantidad de gas ocupa un volumen de 80 cm3

a una presión de 750 mm Hg. ¿Qué volumen

ocupará a una presión de 1,2 atm.si la temperatura no cambia?

Explanation:

El volumen inicial de una cierta cantidad de gas es de 200 cm3

a la temperatura de 20ºC. Calcula el

volumen a 90ºC si la presión permanece constante.

If one form of a gene can mask the appearance of another form, that form is considered dominant over the other form. Option B.

According to Mendel, genes are usually made up of 2 alleles. These alleles can be the same or different. When the alleles are the same, the gene is said to be homozygous. If the alleles are different, the gene is said to be heterozygous.

When the two alleles that make up a gene are different, one will be dominant and the other will be recessive. The dominant gene masks the effect of the recessive gene. In other words, the recessive gene cannot be expressed as long as it coexists with the dominant gene. In order for it to be expressed, it has to be in two copies or a homozygous recessive form.

For the dominant allele, however, only one copy is needed for it to be expressed.

In summary, if one form of a gene can mask the appearance of another form, that form is considered dominant over the other form.

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Answer:Metals have a less likely chance to gain electrons because it is easier to lose their valance electrons and form cations. It is easier to lose their valence electrons because metals' nuclei do not have a strong pull on their valence electrons. Thus, metals are known to have lower electron affinities

Explanation:

hope this helps

The mass ratio of oxygen gas to carbon dioxide gas in the mixture will be equal, with a ratio of 1:1. This is because equal volumes of gases under the same conditions contain an equal number of particles.

When 1 liter of oxygen gas is mixed with 1 liter of carbon dioxide gas under the same conditions of temperature and pressure, the mass ratio of the gases in the mixture will be 1:1. This is because gases behave ideally, according to Avogadro's Law, which states that equal volumes of gases, under the same conditions of temperature and pressure, contain an equal number of particles. In other words, the number of moles of each gas in the mixture will be the same.

The molar mass of oxygen (O₂) is 32 g/mol, while the molar mass of carbon dioxide (CO₂) is 44 g/mol. Since both gases have the same volume and contain an equal number of moles, the mass ratio can be calculated using their molar masses.

Let's assume the volume of the gases is 1 liter each. In 1 liter of oxygen gas, there will be (1 mole of O₂). The mass of 1 mole of O₂ is 32 g. Therefore, the mass of oxygen gas in the mixture will be 32 g.

Similarly, in 1 liter of carbon dioxide gas, there will be (1 mole of CO₂). The mass of 1 mole of CO₂ is 44 g. Hence, the mass of carbon dioxide gas in the mixture will be 44 g.

Therefore, the mass ratio of oxygen gas to carbon dioxide gas in the mixture will be 32 g : 44 g, which simplifies to 8 g : 11 g or 1:1.

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Answer:

The name of that molecule should be 1-pentyne

so your answr should be B

Explanation:

Molecules are species made up of atoms. The given molecule in the figure is 1-pentyne. Thus, option B is correct.

1-Pentyne is a chemical compound with the formula C₅H₈, and an internal alkyne group between the first and the second carbon atom.

The molecules consist of twelve bonds including the bonds between the carbon-carbon, and carbon-hydrogen. There is one triple or the alkyne bond present and five carbon hence the name of the molecule is 1-Pentyne.

Therefore, the molecule is option b. 1-Pentyne.

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The volume of the balloon when found, considering no helium escape, would be 0.74 L.

Charles's Law states that at constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin (K). The equation can be written as:

V₁ / T₁ = V₂ / T₂

Where V₁ and T₁ are the initial volume and temperature, and V₂ and T₂ are the final volume and temperature.

In this case, the initial volume (V₁) is 0.80 L and the initial temperature (T₁) is 27°C, which needs to be converted to Kelvin (K). Adding 273.15 to the Celsius value gives us 300.15 K.

The final temperature (T₂) is 22°C, which converts to 295.15 K.

Using the formula, we can find the final volume (V₂):

V₂ = (V₁ * T₂) / T₁

V₂ = (0.80 L * 295.15 K) / 300.15 K

V₂ ≈ 0.788 L

Therefore, the volume of the balloon when found, assuming no helium escape, would be approximately 0.788 L or 0.74 L when rounded to two significant figures.

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The quantum numbers: (n, l, ml, ms) are presented with sets so the valid sets is given by (5, 3, -4, 1/2), option B.

Each electron's motion and trajectory within an atom are perfectly described by a set of four quantum numbers. A wave function that satisfies the Schrödinger equation may be used to express the sum of all the quantum numbers of all the electrons in an atom. The Pauli Exclusion Principle states that no two electrons in the same atom may share the same combination of four quantum numbers.

Each electron in an atom has a distinct set of quantum numbers. Because they can be used to determine an atom's electron configuration and the likely location of its electrons, quantum numbers are significant. The atomic radius and other properties of atoms, such as ionisation energy, are also understood using quantum numbers.

The main quantum number (n), orbital angular momentum quantum number (l), magnetic quantum number (ml), and electron spin quantum number (ms) are the four quantum numbers found in atoms. The primary quantum number, n, specifies an electron's energy as well as its most likely distance from the nucleus.

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Complete question:

Below you are presented with sets of quantum numbers: (n, l, ml, ms). Only one is a valid set. Which is it?

a (3,1,-1,-1/2)

b (5,3,-4,1/2)

c (4,3,2,1)

d (2,0,0,0)

e (3,3,2,1/2)

On completing and balancing the half-reaction of chromium (iii) forming from dichromate the number of electrons are either produced or consumed  are option (b): Three electrons are produced.

To determine the number of electrons produced or consumed in the half-reaction of chromium(III) forming from dichromate, let's first write the balanced half-reaction. The dichromate ion (Cr2O7^2-) is reduced to chromium(III) ion (Cr^3+) in this reaction. We can represent the reduction half-reaction as follows:

Cr2O7^2- ⟶ Cr^3+

To balance the half-reaction, we need to equalize the number of chromium atoms and oxygen atoms on both sides. Since there are two chromium atoms on the left side and only one on the right side, we add a coefficient of 2 in front of the chromium ion:

2Cr2O7^2- ⟶ 2Cr^3+

Now, let's examine the changes in oxidation state for chromium in this reaction. In dichromate (Cr2O7^2-), chromium has an oxidation state of +6, while in chromium(III) (Cr^3+), it has an oxidation state of +3. Therefore, the oxidation state of chromium decreases by 3 in this reduction half-reaction.

Reduction involves a gain of electrons. Since the oxidation state of chromium decreases by 3, it means that three electrons are gained by each chromium ion. Therefore, the correct answer is option (b): Three electrons are produced.

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Answer:

c. Six electrons are consumed

Explanation:

The first step is to ensure that the chromium atoms are balanced by adjusting the coefficients if needed. Do so by giving the Cr3+ ion a coefficient of 2.

Cr2O2−7 ⟶ 2Cr3+ (aq)

Next, balance the oxygen atoms by adding H2O molecules. The half-reaction has seven O atoms on the left and none on the right, so add 7H2O (l) to the right side.

Cr2O2−7 ⟶ 2Cr3+ (aq) + 7H2O (l)

Next, balance the hydrogen atoms by adding H+ ions. The half-reaction has 14 H atoms on the right side and none on the left, so add 14H+(aq) to the left side.

Cr2O2−7 + 14H+ (aq) ⟶ 2Cr3+ (aq) + 7H2O (l)

At this point, the charge can be balanced by adding electrons (e−). To do so, find the total charge on each side of the reaction. The left side has a total charge of (−2) + 14 × (+1) = 12+. The right side has a total charge of 2 × (+3) = 6+. Adding 6e− to the left side brings the charge down to 6+ to match the right side.

Cr2O2−7 + 14H+ (aq) +6e− ⟶ 2Cr3+ (aq) + 7H2O (l)

This gives us the answer to the question, which is that six electrons are consumed, since they are on the left side of the equation. Note that it does not make a difference whether the reaction is assumed to be in an acidic or a basic solution. The extra step taken for a basic solution is to add the same number of OH− ions to both sides of the reaction, which does not affect the number of electrons needed to balance the charges.

Answer:

The answer is a) \(C_{4} H_{16} O_{5}\)

Explanation:

The other chemical formulas' subscripts share a common factor, so they can be simplified to an empirical formula, however, the subscripts in  \(C_{4} H_{16} O_{5}\) cannot be simplified any further, because they do not share any more whole-number factors with each other.

Answer:

false

Explanation:

magnetic field lines can be accurately observed using *iron filling*

The required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

To determine the required volume flow rate of liquid ethyl alcohol, we need to calculate the fuel flow rate first. Then, we can convert it to volume flow rate.

Given:

Rate of energy release (Q) = 2000 kJ/s

Excess air = 40% (or 0.4)

First, let's calculate the fuel flow rate (m f):

Q = m f × Lower Heating Value (LHV)

The Lower Heating Value (LHV) for ethyl alcohol can be calculated using the enthalpy of vaporization:

LHV = enthalpy of vaporization / molecular weight of fuel

LHV = 42,340 kJ/k mol / 46.07 kg/k mol = 920.11 kJ/kg

Now, we can calculate the fuel flow rate:

m f = Q / LHV

m f = 2000 kJ/s / 920.11 kJ/kg ≈ 2.173 kg/s

Next, let's convert the fuel flow rate to volume flow rate:

Volume flow rate (V f) = m f / density

V f = 2.173 kg/s / 790 kg/m³ = 0.002749 m³/s

Finally, we can convert the volume flow rate to L/min:

V f = 0.002749 m³/s × (1000 L/1 m³) × (60 s/1 min) ≈ 164.9 L/min

Therefore, the required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

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b. The critical path refers to the longest sequence of activities from the start to the end of a project, considering the duration of each activity.

c. The total duration for the critical path activities is 18 days, which represents the expected project completion time.

The critical path is a term used in project management to refer to the sequence of activities that determines the minimum time required to complete a project. It is the longest path from the start to the end of the project, considering the duration of each activity. The critical path helps identify the activities that must be closely monitored and managed to ensure the project is completed on time.

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The pressure in the 5.00 L tank with 5.25 moles of oxygen at 39.3 °C is approximately 8.53 atm.

To determine the pressure in atm of a 5.00 L tank with 5.25 moles of oxygen at 39.3 °C, we can use the ideal gas law equation: PV = nRT.

Here, P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L⋅atm/mol⋅K), and T is the temperature in Kelvin.

Step 1: Convert the temperature from °C to Kelvin by adding 273.15 to 39.3 °C:
T = 39.3 + 273.15 = 312.45 K

Step 2: Plug the values into the ideal gas law equation:
P × 5.00 L = 5.25 moles × 0.0821 L⋅atm/mol⋅K × 312.45 K

Step 3: Solve for P:
P = (5.25 moles × 0.0821 L⋅atm/mol⋅K × 312.45 K) / 5.00 L
P ≈ 8.53 atm

So, the pressure in the 5.00 L tank with 5.25 moles of oxygen at 39.3 °C is approximately 8.53 atm.

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Your answer is A. What is the composition of air?

The question that can be answered by science is What is the composition of air? The correct option is A.

Science is a subject that deals with the components of the earth. It has a wide variety of components of earth. Like planets and meteorites. Plants, animals, and other creatures. Nature, trees, and other abiotic factors.

Science gives answers to the secrets of the earth, and they unravel the mysteries of nature and the earth. They solve the mysteries of air, water, and other natural processes.

So the composition of air can be told by science. The air is made up of a mixture of gases. Air is present in the atmosphere. It is needed for breathing, and it is an important component of life because it provides oxygen to the body.

The correct option is A. What is the composition of air?

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This is a question about the ability of cycloalkanes to exhibit geometric (cis-trans) isomerism. To determine which of the given cycloalkanes can exhibit this type of isomerism, we need to consider their structures.

Cycloalkanes with more than six carbon atoms can exhibit cis-trans isomerism if they have two different substituents on the ring. In such cases, the two different substituents can be arranged in two different ways around the ring, resulting in two different isomers. Looking at the given options, we can see that 1-ethyl-3-methylcycloheptane has two different substituents (ethyl and methyl) on the ring, and therefore is capable of exhibiting cis-trans isomerism.

3-ethyl-1,1-dimethylcyclohexane, on the other hand, has three identical substituents (ethyl and two methyls) on the ring, and therefore cannot exhibit cis-trans isomerism.
Similarly, 1-ethyl-3-methylcyclopentane has two different substituents (ethyl and methyl) on the ring, and is capable of exhibiting cis-trans isomerism.
Finally, 1-cyclopropyl-2-methylcyclohexane has only one substituent (cyclopropyl) on the ring, and therefore cannot exhibit cis-trans isomerism.
So, the cycloalkanes capable of exhibiting geometric (cis-trans) isomerism are 1-ethyl-3-methylcycloheptane and 1-ethyl-3-methylcyclopentane.

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Answer:

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Sand is a granular material composed of finely divided rock and mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt.