Which reason best explains why metals are malleable

Because they have delocalized electrons

Because they have localized electrons

Because they have ionic bonds

Because they have rigid bonds

The molar mass of the protein under the conditions that we have in this question can be obtained to be 12065 g/mol.

We know that the osmotic pressure is one the colligative properties of the solution. The colligative properties are the properties that depend on the amount of substance that is present in the solution.

Mass of the protein = 0.135 g

Volume of the solution = 2.00 mL

Temperature of the system = 28 ∘C + 273 = 301 K

Osmotic pressure of the solution = 0.138 atm

We can get the osmotic pressure from;

π = iCRT

π = Omotic pressure

i = Van't Hoff factor

C = concentration of the solution

R = gas constant

T = temperature

Let the molar mass of the protein be M

0.138 = 1 * 0.135/M/0.002 * 0.082 * 301

0.138 =  1 * 0.135/0.002M * 0.082 * 301

0.138 = 3.33/0.002M

0.138 * 0.002M  = 3.33

M = 3.33/0.138 * 0.002

M = 12065 g/mol

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When two iron bars at different temperatures are placed in thermal contact, the rate of heat exchange can vary depending on whether the system is isolated or open.

If the iron bars were placed in thermal contact in an open system instead of an isolated system, the results would be different due to the exchange of energy with the surroundings. In an open system, energy can be transferred between the system and the surroundings, typically in the form of heat.

When the iron bars are in thermal contact, heat will flow from the hotter bar to the cooler bar until they reach thermal equilibrium. In an open system, the heat transferred from the hotter bar will not be retained within the system but will instead be dissipated into the surroundings. Similarly, the cooler bar will absorb heat from the surroundings. This continuous exchange of heat with the surroundings will affect the rate of temperature change in the bars.

In the given scenario, where the room temperature is 25°C, when the iron bars are in contact, the hotter bar at 200°C will lose heat to the surroundings, and the cooler bar at 120°C will absorb heat from the surroundings. This heat exchange with the surroundings will slow down the rate at which the bars reach thermal equilibrium.

Therefore, in an open system, after 30 minutes of thermal contact, the iron bars may not reach the exact temperature of 160°C as they did in the isolated system. The final temperature of the bars would depend on the rate of heat exchange with the surroundings and the difference in temperature between the bars and the surroundings.

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From the given graph, if we change from a moderately acidic environment ( pH near 6) to a basic environment, the peroxidase activity will decrease. Therefore, option (A) is correct.

pH can be described as the negative logarithm of hydrogen ion (H⁺) concentration. Mathematically, pH is generally inversely proportional to the concentration of hydrogen ions (H⁺).

pH = -log ([H⁺])

In chemistry, pH is a scale used to determine the acidity or basicity of an aqueous solution. Acidic solutions are calculated to have lower pH values than basic or alkaline solutions.

The pH scale possesses ranges from 0 to 14 while pH 7.0 is neutral. A low pH (about 1 or 2) is acidic and a high pH (12 or 14) is basic.

When we change the moderately acidic environment to a basic environment. We actually increase the pH value in the graph showing the peroxidase activity decreases when pH increases more than 6.

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Answer:

Solid

Explanation:

Cus its solid, take a brick for example. It's hard and has no space unlike liquid or gas.

Answer:

The water is not pure i.e. It contains some hydroxide and bromobutane ions that is why the upper phase contains 1-bromopentane

Explanation:

The upper phase after reflux will contain 1-bromopentane even when its density is 1.276g/cm^3 because even though the density of water = 1.00g?cm^3  the water is not pure i.e. It contains some hydroxide and bromobutane ions making it to stay at the bottom while 1- bromobutane stays at the upper phase

The amount of work that has been done by the man would be =1,102.5Nm

To calculate the amount of work that was done by the man, the formula that should be used would be given below as follows:

Work done = Force × distance

But force = mass × acceleration

mass = 75kg

acceleration = 9.8m/s²

Force = 75×9.8 =735N

Work done = 735× 1.5 = 1,102.5Nm

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Based on the given concentration and volume of solutions, the molarity of the ions are as follows:

The molarity of a solution is the number of moles of the substance in a given volume of solution in litres.

Moles of [BrO3-] = 0.04M × 0.005 L = 0.0002 moles

Moles of [I-] = 0.01 M × 0.005 L = 0.00005 moles

Moles of [H+] = 0.1 M × 0.005 L = 0.0005 moles

Flask A:

total volume = 15 mL = 0.015 L

Molarity of [I-] = 0.00005/0.015

Molarity of [I-] = = 0.0033 M

Flask B:

Total volume = 10 mL = 0.01 L

Molarity of [BrO3-] = 0.0002/0.01

Molarity of [BrO3-] = 0.02 M

Molarity of [H+] = 0.0005/0.01

Molarity of [H+] = 0.05 M

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Answer:

7.41 × 10⁻⁵

Explanation:

Let's consider the basic dissociation reaction of trimethylamine (CH₃)N).

(CH₃)N + H₂O = (CH₃)NH⁺ + OH⁻

According to Brönsted-Lowry, in this reaction (CH₃)N is a base and (CH₃)NH⁺ is its conjugate acid. The pKb for (CH₃)N is 9.87. We can calculate the pKa of (CH₃)NH⁺ using the following expression.

pKa + pKb = 14

pKa = 14 - pKb = 14 - 9.87 = 4.13

Then, we can calculate the acid dissociation constant for (CH₃)NH⁺ using the following expression.

pKa = -log Ka

Ka = antilog - pKa = antilog -4.13 = 7.41 × 10⁻⁵

Answer:

im just trying to get work done i will help u if i knew it

SO₃+ H₂SO₄ → H₂SO₄ This reaction is synthesis type of reaction, because that would be combination (synthesis) A + B → AB. Therefore, option A is correct.

There are five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion.

Biochemical reactions are chemical reactions that occur within living things. Metabolism refers to the sum of all biochemical reactions in an organism. Exothermic and endothermic chemical reactions are both part of metabolism.

Hydration is the process of combining water molecules with another substance to form a single, new compound. SO3 is an acidic oxide that reacts with and dissolves in water to form sulfuric acid, H2SO4.

Thus, option A is correct.

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Answer:

None of these are correct, because there is no way to balance this equation, but I hope these steps help you figure out your answer.

Explanation:

Count out the single amounts of elements you have on both sides of the equation. To be balanced, you need to have the exact same for each element.

Before balanced Left side.

Cl-2

O-8

H-2

Before balanced right side.

H-1

Cl-1

O-3

That means we need to increase Hydrogen, Chlorine and Oxygen on the right for sure and see how that affects the equation. You can keep adding the Coefficients until the # of elements begin to match on each side.  

(I tried to balance this equation, it doesn't work, there is too much on the reactants side for what the product is.)

The option that describes a situation in which reduction occurs is Cl₂ becoming Cl⁻

In chemistry, reduction means a class of chemical reactions in which the number of electrons associated with an atom or group is increased.

A compound that accepts electrons is said to be reduced.

Situations in which reduction occurs include:

Cl₂ ⇒Cl⁻

When reduction occurs, the oxidation number (superindex) appears to decrease that number. In this case 2+ becomes 1-.

Note:

As with other problems, a decreasing oxidation number means that the compound or element is being reduced (gaining electrons), while an increasing oxidation number means it is being oxidized (losing electrons). increase.

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Answer:

a) polytetrafluorethylene

b) polyethylene terepthalate

c) Nickel

d) Polytetrafluroethylene

e) Aluminum

Explanation:

a) polytetrafluorethylene can be used to make laboratory bottles that can contain nitric acids ( dilute ones ) because of its resistance to either acidic or basic solution

b) polyethylene terepthalate can be used because it is relatively cheaper, also Benzene doesn't exhibit corrosion effect

c) Nickel can be used to produce pipes that transport hot alkaline solutions

d) Polytetrafluroethylene can be used for underground water tanks

e) Aluminum is used because it is light weighted and exhibits corrosion resistivity to climate change

Amino acid addition to a growing chain happens at the C terminal and ATP is required.

Proteins are made up of substances called amino acids. Proteins and amino acids are the components of life. Amino acids are the byproducts of the digestion or breakdown of proteins. Amino acids are used by the human body to create proteins that benefit the organism. Two ATP molecules are needed for amino acid activation, two more for peptide bond formation and ribosome translation, as well as an additional ATP molecule or so for error correction and the synthesis of sequences that are lost during protein maturation, in order to add an amino acid to a growing peptide chain.

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Answer:

Protein Power

Much of a cell's efforts go toward making proteins. Proteins carry out many important functions in the body. ... Cell organelles must work together to carry out protein synthesis, utilize proteins within the cell, and transport them out of the cell.

Answer:

Double displacement chemical reaction.

Explanation:

Hello,

In this case, for the given reaction we firstly balance it:

\(LiBr_2 +K_2CO3 \rightarrow LiCO3 +2KBr\)

Then, since the lithium and potassium cations are being exchanged to each other from bromide and carbonate, we are talking about a double displacement chemical reaction.

Best regards.

The molarity of the solution prepared by dissolving 0.355 moles of NH₃ in enough water to make 3.84 L of solution is 0.092 M

First, we shall list out the given parameters from the question. This is given below:

Molarity of a solution is defined as mole per unit volume i.e

Molarity of solution = mole / volume

Inputting the various parameters, we have:

Molarity of solution = 0.355 / 3.84

Molarity of solution = 0.092 M

Thus, from the above calculation, it is evident that the molarity of the solution is 0.092 M

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O2 is the limiting reagent and yields 20.4g of CO2.

Describe limiting reagent

The limiting reactant, also known as the limiting reagent, is the reactant that is used first during a chemical reaction, hence restricting the amount of product that can be produced.

2C₂H₂ + 5O₂   →  4CO₂ + 2H₂O

Quantity of C2H2 moles:

Moles equal mass divided by molar mass

13.7 g/26.04 g/mol is the number of moles.

= 0.526 mol.

O2 moles are calculated using the formula: moles = mass / molar mass.

18.5 g/32 g/mol = the number of moles

= 0.578 mol

Produced CO2 mass:

Number of moles times molar mass equals mass

Mass = 0.4622 mol at 44 g/mol

Mass = 20.328 g

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The empirical formula of the compound with 14.3% Nitrogen, 4.1% Hydrogen, and 81.6% Bromine would be \(NH_4Br\).

The compound contains 3 atoms of different elements according to the following percentage:

Let's find the mole equivalent of each percentage:

Divide by the smallest mole:

Thus, the empirical formula of the compound is \(NH_4Br\).

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They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

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Answer: FALSE

Explanation: Magnesium is more reactive.

Hope this helps!

Answer:

False

Explanation:

Magnesium is more reactive.

Answer:

1) As you move down a group, first ionization energy decreases. WHY? Electrons are further from the nucleus and thus easier to remove the outermost one. 2) As you move across a period, first ionization energy increases.

so i think it is b

Explanation:

1) Mass percent

2) List known values

Sample: 0.965 kg

2) Plug in known values and solve for grams of solute.

3) Convert grams of solute to moles

The molar mass of the unknown compound is 25.2 g/mol

There are 10.45 moles of the unknown compound present in the sample.

As a result, at the same temperature and pressure as the 12.4 g sample of hydrogen gas, a 56.2 g sample of oxygen gas takes up 39.3 l.

1mol of petrol takes up 22.4 litres at STP. So, 32 grams of oxygen take up 22.4 litres of space. Consequently, 33.6 litres of space are taken up. Hence, 33.6 litres is the volume that 48 g of O2 at STP occupy.

To resolve this issue, we can employ the ideal petrol rule, PV = nRT. If both gases have the same temperature and pressure, we can put up the equation as follows: PV = nRT

For hydrogen gas: n(H2) = m(H2) / M(H2)

= 12.4 g / 2.016 g/mol  

= 6.16 mol

Substituting the given values, we get:

(1 atm)(23.5 L) = (6.16 mol)(0.08206 L·atm/mol·K)(T)

Solving for T, we get:

T = (1 atm)(23.5 L) / (6.16 mol)(0.08206 L·atm/mol·K)

T = 283 K

For oxygen gas:

n(O2) = m(O2) / M(O2)

n(O2) = 56.2 g / 31.9988 g/mol

n(O2) = 1.757 mol

Substituting the values, we get:

(P)(V) = (n)(R)(T)

(1 atm)(V) = (1.757 mol)(0.08206 L·atm/mol·K)(283 K)

Solving for V, we get:

V = (1.757 mol)(0.08206 L·atm/mol·K)(283 K) / (1 atm) = 39.3 L

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Answer:

I'd say 624.2^3 inches.

Explanation:

Answer:

What’s the answer ‍♀️

Explanation:

Based on the mass of sodium carbonate reacting,

The equation of the reaction of sodium carbonate reacting with calcium hydroxide is given below:

Na₂CO₃ + Ca(OH)₂ ----> 2 NaOH + CaCO₃

Moles of sodium carbonate reacting = mass /molar mass

The molar mass of sodium carbonate = 106 g/mol

Moles of sodium carbonate reacting = 56/106

Moles of sodium carbonate reacting =0.528 moles

Moles of CaCO₃ produced = 0.528 moles

Mass of CaCO₃ produced = 0.528 * 100 g

Mass of CaCO₃ produced = 52.8 g

Moles of sodium hydroxide produced = 2 * 0.528

Mass of sodium hydroxide produced = 2 * 0.528 * 40 g

Mass of sodium hydroxide produced =42.24 g

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Answer:

and is capillaries

Explanation:

hope it helps

Answer:The frequency of near infrared light with a wavelength of 1200 nm =2.5 x 10^14 s-1

Explanation:

In an electromagnetic spectrum,

F= C/ λ

where F= FREQUENCY

C= SPEED OF LIGHT=3.0 x 10 ^8m/s

λ= WAVELENGTH= 1200nm to m becomes 1200 x 10^-9m

since 1nm = 1x10−9m

The frequency of near infrared light with a wavelength of 1200 nm= Speed of light / Wavelength

=3.0 x 10 ^8m/s/1200 x 10^-9m

The frequency of near infrared light with a wavelength of 1200 nm=2.5 x 10^14 s-1

The frequency of near infrared light with a wavelength of 1200 nm is 2.5 × 10¹⁴ per sec.

Frequency of any light is inversly proportional to the wavelength of the light as:

υ ∝ 1/λ

υ = c/λ, where

c = speed of light = 3.8 × 10⁸ m/sec

λ = wavelength of light = 1200nm = 1200×10⁻⁹m

On puuting values, we get

υ = (3.8 × 10⁸m/sec) / (1200×10⁻⁹m)

υ = 2.5 × 10¹⁴ per sec.

Hence required frequency is 2.5 × 10¹⁴ per sec.

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