The shortest a helix segment in a protein that will span a membrane bilayer has about amino acid residues. A 5 B) 20 50 100 E 200 Peripheral membrane proteins: A are generally noncovalently bound to membrane lipids. B are usually denatured when released from membranes. C can be released from membranes only by treatment with detergent(s). D may have functional units on both sides of the membrane. E penetrate deeply into the lipid bilayer.

Answer:

sorry

Explanation:.

Answer:

84%

Explanation:

An alkene is formed from a dehydration reaction.

An alkene is formed from a dehydration reaction. Dehydration involves the loss of water from a molecule. In this case, we have compound A as shown in the image attached to this answer.

The dehydration is carried by the use of the reagents pocl3 and pyridine. Let us recall that the dehydration would occur at the point where the HOH would depart. The entire reaction is shown in the image attached.

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Answer:

The molarity of the diluted solution will be 0.208 M.

Explanation:

Dilution consists of a procedure to prepare a less concentrated solution from a more concentrated one. It is achieved by adding more solvent to the same amount of solute.

The quantity or mass of the solute is not changed but only that of the solvent. As only solvent is being added, the consequence is that by not increasing the amount of solute but if the amount of solvent, the concentration of the solute decreases.

The expression for a dilution is:

Ci * Vi = Cf * Vf

where

In this case:

Replacing:

0.25 M* 125 mL= Cf* 150 mL

Solving:

\(Cf=\frac{0.25 M*125 mL}{150 mL}\)

Cf= 0.208 M

The molarity of the diluted solution will be 0.208 M.

Answer:

Which is an example of a pioneer species?

Ferns

Spiders

Squirrels

Explanation:

You're welcome.

Answer:)

The answer is A: Lichens

:) hope this helps have a great day!

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Therefore, the value of the rate constant for the dissociation of NOBr is 2.50 x 10^-1 /s.

To determine the rate constant for the dissociation of NOBr, we first need to use the initial rate data. The initial rate is the rate of the reaction at the beginning of the reaction when the reactants are still in excess. The table below shows the initial rate data for the dissociation of NOBr:
| [NOBr] | Initial Rate (M/s) |
|--------|-------------------|
| 0.010  | 2.50 x 10^-3       |
| 0.020  | 5.00 x 10^-3       |
| 0.030  | 7.50 x 10^-3       |
We can use this data to calculate the rate constant for the reaction using the following equation:
Rate = k[NOBr]
where k is the rate constant and [NOBr] is the concentration of NOBr.
We can rearrange the equation to solve for k:
k = Rate / [NOBr]
Using the data in the table, we can choose any set of [NOBr] and initial rate values to calculate k. Let's choose the first set of data:
k = (2.50 x 10^-3 M/s) / (0.010 M)
k = 2.50 x 10^-1 /s
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Nonelectrolytes do not conduct electricity. Weak electrolytes partially dissociate into ions and have limited conductivity. Strong electrolytes completely dissociate into ions and have high conductivity. Among the given options, option (c) with 0.015 M NaCl is expected to have the smallest conductance due to its lower concentration of ions.

The terms "nonelectrolytes," "weak electrolytes," and "strong electrolytes" refer to the ability of a substance to conduct electricity when dissolved in water (or any other suitable solvent).

1. Nonelectrolytes:

Nonelectrolytes are substances that do not conduct electricity when dissolved in water. They exist as molecules in their solid or liquid form and do not dissociate into ions when dissolved. Examples of nonelectrolytes include sugar (sucrose), alcohol (ethanol), and most organic compounds. Since they do not produce ions, they cannot carry an electric current.

2. Weak electrolytes:

Weak electrolytes are substances that partially dissociate into ions when dissolved in water. They conduct electricity to a limited extent. In a solution of a weak electrolyte, only a small fraction of the molecules dissociate into ions, while the majority remain in molecular form. Weak acids and weak bases are common examples of weak electrolytes. An example is acetic acid (CH₃COOH), which partially dissociates into hydrogen ions (H+) and acetate ions (CH₃COO⁻) in water.

3. Strong electrolytes:

Strong electrolytes are substances that completely dissociate into ions when dissolved in water. They are excellent conductors of electricity. In a solution of a strong electrolyte, all or nearly all of the solute molecules break apart into ions. Strong acids (e.g., hydrochloric acid, HCl) and soluble ionic compounds (e.g., NaCl, KNO₃) are examples of strong electrolytes.

Now, considering the given options:

(a) 0.060 M NaCl

(b) 0.030 M NaCl

(c) 0.015 M NaCl

NaCl is an ionic compound, and when dissolved in water, it completely dissociates into Na+ and Cl- ions, making it a strong electrolyte. The conductivity of an electrolyte solution is directly proportional to the concentration of ions present. Therefore, the solution with the highest concentration of ions will have the highest conductance.

Among the given options, option (a) with a higher concentration of NaCl (0.060 M) is expected to have the highest conductance. Option (b) has a lower concentration (0.030 M), and option (c) has the lowest concentration (0.015 M). Hence, option (c) with the lowest concentration of NaCl is expected to have the smallest conductance.

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Answer:

controls stem height in peas, for example, has one allele for tall stems and one allele for short stems. Each pea plant inherits a combination of two alleles from its parents either two alleles for tall stems, two alleles for short stems, or one of each. Individual alleles control the inheritance of traits

Explanation:

Even at the beginning of the watch's production in January 1944, we would still have 100% of the original tritium. We would be able to read the time at night until the present day without the tritium falling below 16%.

Let's calculate the specific year until which you could read the time at night based on the given information.

Number of half-lives = (current year - 1944) / 12.3

Remaining percentage = 100 × (0.5)(number of half-lives)

We want the remaining percentage to be 16% or more:

100 × (0.5)(number of half-lives) ≥ 16

Let's solve this equation to find the specific year. We'll start by isolating the exponent:

(0.5)(number of half-lives) ≥ 0.16

Taking the logarithm of both sides (base 0.5):

log(0.5) [(0.5)(number of half-lives)] ≥ log(0.5) (0.16)

Number of half-lives × log(0.5) ≥ log(0.5) (0.16)

Number of half-lives ≥ [log(0.5) (0.16)] / log(0.5)

Number of half-lives ≥ -0.936

Since the number of half-lives must be a whole number, we can round up to the nearest whole number:

Number of half-lives ≥ 0

This means that even at the beginning of the watch's production in January 1944, we would still have 100% of the original tritium. Therefore, we would be able to read the time at night until the present day without the tritium falling below 16%.

In conclusion, based on the given half-life of tritium and the required percentage of remaining tritium, we can read the time at night indefinitely without any specific year limit.

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Answer:

It has been suggested that climate change, which would generally lead to warmer winters in the Northeast, may make it difficult to produce some apple varieties in parts of the region. ... Greater variability in weather, such as warm periods followed by cold snaps in winter, can damage both flower buds and trees.

Explanation:

Answer:

b) a rubber tire

Explanation:

Answer: B - a rubber tire

Explanation: Rubber is an insulator

Answer:

False,  I doesn't just disappear into thin air it dissolved so it mixes with the other thing. So now it is transparent AKA see through

Explanation:

Answer:

b

Explanation:

Answer:

Detail is given below.

Explanation:

Given data;

Abundance of Berkmarium-95 = 70%

Abundance of Berkmarium-97 = 28%

Abundance of Berkmarium-94 = 2%

Average atomic mass closer to which isotope = ?

Solution:

1st of all we will calculate the average atomic mass of Berkmarium.

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass  = (70×95)+(28×97)+(2×94) /100

Average atomic mass =  6650 + 2716+ 188 / 100

Average atomic mass= 9554 / 100

Average atomic mass = 95.54 amu

The average atomic mass is closer to the isotope Berkmarium-95  because it is present in abundance as compared to the other two isotope. So this isotope constitute most of the part of Berkmarium.

The mole fraction of oxygen gas is 0.290

First we will calculate the total pressure by adding the partial pressure of all gases as follows:

Partial pressure of CH₄= 143 mmHg

Partial pressure of N₂= 469mmHg

Partial pressure of O= 251mmHg

Total pressure = partial pressure of CH₄+ partial pressure of N₂+ partial          pressure of O₂

Total pressure= 143+ 469+ 251

                        =863mmHg

Finally we will calculate the mole fraction of O₂ with the help of formula written below:

Mole fraction=\(\frac{partial pressure }{total pressure}\)

Mole fraction of O₂=\(\frac{251}{863}\)

Mole fraction of O₂= 0.290

Therefor answer will be 0.290

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Ammonium sulphide ((NH4)3S) contains roughly 20.55% nitrogen by mass.

Two nitrogen (N) atoms, eight hydrogen (H) atoms, one sulphur (S) atom, and four oxygen (O) atoms are all present in one molecule of ammonium sulphate (NH4)2SO4. There are therefore 15 atoms in total. We are aware that the relative atomic masses of each element present in a compound can be added to determine its molar mass.

N: 1 x 14.007 g/mol equals 14.007 g/mol

The molar mass of ammonium sulphide in its entirety is:

(1 x 14.007 g/mol) + (3 x 1.008 g/mol) + (1 x 32.06 g/mol) = 68.153 g/mol

We can use the following formula to determine the nitrogen proportion by mass:

% N = (mass of N / total mass of compound) x 100%

Plugging in the values, we get:

% N = (14.007 g/mol / 68.153 g/mol) x 100% ≈ 20.55%

As a result, there is around 20.55% of nitrogen by mass in ammonium sulphide ((NH4)3S).

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Answer:

Agree

Explanation:

Theories are refined and then become laws and laws are somehow more important than theories. In science actually what a law is, is a descriptive generalization. So we talk about the laws of thermodynamics that tell you about heat under different circumstances.

Molar mass of C3H8 = (3 x atomic mass of C) + (8 x atomic mass of H)

= (3 x 12.011 g/mol) + (8 x 1.008 g/mol)

= 44.097 g/mol

Therefore, the number of moles of propane is:

4.33 x 10^24 molecules / 6.022 x 10^23 molecules/mol = 7.20 mol

So, there are approximately 7.20 moles of propane (C3H8) in 4.33x10^24 molecules of propane.

Propane (C3H8) is a versatile fuel with a wide range of applications. It is used in Heating, Transportation, Agriculture, and Industry and s fuel for outdoor activities such as camping and grilling.

Propane (C3H8) is not very soluble in water. Propane is a nonpolar molecule, meaning it does not have a positive or negative charge on its surface. Water, on the other hand, is a polar molecule, which means that it has a positive end and a negative end. Because propane and water have different polarities, they do not mix well.

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Deprotonation of a terminal alkyne involves the removal of a proton from the hydrogen atom attached to the carbon at the end of the alkyne chain. This process is important in organic synthesis as it can be used to generate an acetylide anion, which is a versatile nucleophile for various reactions.

There are several bases that can be used to deprotonate a terminal alkyne. The most commonly used bases are strong bases such as NaNH2, NaOCH3, NaH, NaOH, and BuLi.

- NaNH2: This is a very strong base that is commonly used to deprotonate terminal alkynes. It is a good choice because it is very reactive and can easily remove the proton from the alkyne carbon. However, it is also very reactive and can be difficult to handle.

- NaOCH3: This is another strong base that is commonly used to deprotonate terminal alkynes. It is similar to NaNH2 in that it is very reactive and can easily remove the proton from the alkyne carbon. However, it is less reactive than NaNH2 and can be easier to handle. - NaH: This is a strong base that is commonly used in organic synthesis. It is a good choice for deprotonating terminal alkynes because it is relatively easy to handle and has a high reactivity towards protons.

- NaOH: This is a weaker base compared to the other bases mentioned above. It is not as reactive towards protons, but it can still be used to deprotonate terminal alkynes under certain conditions.

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Use Charles' Law: V1/T1 = V2/T2. We assume the pressure and mass of the helium is constant. The units for temperature must be in Kelvin to use this equation (x °C = x + 273.15 K).

We want to solve for the new volume after the temperature is increased from 25 °C (298.15 K) to 55 °C (328.15 K). Since the volume and temperature of a gas at a constant pressure are directly proportional to each other, we should expect the new volume of the balloon to be greater than the initial 45 L.

Rearranging Charles' Law to solve for V2, we get V2 = V1T2/T1.  

(45 L)(328.15 K)/(298.15 K) = 49.5 ≈ 50 L (if we're considering sig figs).

According to the electronic configuration, along with platinum and gold silver is considered to be a noble metal.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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According to this equation, two moles of aluminium oxide decompose into three moles of oxygen gas, four moles of aluminium, and two moles of aluminium. Because each element has the equal amount of atoms on both sides of the equation, the reaction is balanced.

Aluminum oxide and hydrogen gas are created when aluminium metal, or Al, interacts with water. Three moles of water and two moles of aluminium metal, or Al, are combined in this reaction to create one mole of aluminium oxide and three moles of hydrogen gas.

This reaction is the result of hydrogen peroxide's spontaneous breakdown into water and oxygen. Because oxygen is a naturally diatomic element, the total number of atoms in each element on both sides of the equation equals one, making the equation balanced.

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Calcium oxide + water = calcium hydroxide.

Magnesium + hydrochloric acid = magnesium chloride + hydrogen.

Sodium hydrogen carbonate + citric acid  = Na3C6H5O7(aq)+3H2O(l)+3CO2(g)

Iron + salt water = 4Fe(OH)3 (rust)

Answer:

1. CaO + H2O _____ Ca(OH)2

Calcium oxide + Water _____ Calcium hydroxide

2. 2 HCI + MG _____ MgCl2 + H2

Magnesium + hydrochloric acid _____ Magnesium Chloride + hydrogen gas

The correct statement(s) about the process of boiling a pot of tap water are:

a. The water's change of state requires an increase in energy.

d. The water is undergoing evaporation.

When water is heated until it reaches its boiling point, it goes through a change of state from a liquid to a gas (water vapor), requiring an increase in energy. The intermolecular interactions binding the water molecules together must be broken during this phase change in order for them to escape into the gas phase.

d. The water is evaporating: Boiling is a particular kind of evaporation that takes place when a liquid's vapor pressure exceeds atmospheric pressure. Enough energy is gained by the water molecules at the surface to overcome intermolecular interactions and escape into the gas phase. Evaporation is the mechanism by which liquid water becomes water, and it takes place over time.

b. The assertion that "The water is undergoing sublimation" is untrue. Without transitioning via the liquid phase, the term "sublimation" describes the immediate change of state from a solid to a gas. Not from a solid to a gas, but from a liquid to a gas precisely, is what happens when something boils.

b. The assertion that "The water's change of state involves a loss of energy to the surroundings" is false. Water must be brought to a boil, not lost to the environment as energy. The heat energy given to the water raises its kinetic energy, enabling the molecules to defy intermolecular interactions and enter the gas phase.

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Answer:

223 g

Explanation:

Answer: A change in appearance. (Please say thanks!)

Explanation:

The biggest sign of a chemical change is change in appearance.

Answer:

d

Explanation:

Answer:

The part that is put in the same time as ruthenium, but has a greater number of atoms than silver.

Answer:

The answer is silver.

Explanation:

edge 2022, trust

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

False

Explanation:

 A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.