Sheets composed of two layers of amphipathic molecules arranged with the hydrophilic groups on the surface and the hydrophobic groups buried in the center that form in water are called?

Answer:

0.0102 g

Explanation:

A common formula for determining the amount of sample remaining in terms of its half-life is

where

t = 50 000 yr

Calculate n

n = 50 000/5730

n = 8.726

===============

N₀ = 4.30 g Calculate N

N = 4.30 × 2.36 × 10⁻³

N₀ = 0.0102 g

Explanation:

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Answer: there are atoms that either have too many or too few neutrons or protons in their nuclei. This results in an imbalance between the jedi forces holding them together, which leads to an excess of internal energy. Such atoms are said to be unstable or radioactive.

Explanation:

Answer:

b

sorry if wrong

Explanation:

Answer:

Explanation:

A large number of elk in Yellowstone Park could affect the number of beavers due to competition for resources. Here's a detailed explanation:

Habitat Destruction: Elk are herbivores that graze on vegetation, including willow and aspen trees, which are important food sources for beavers. If the elk population is high and they consume a significant amount of vegetation, it can lead to habitat destruction for beavers. With a reduced availability of suitable food and habitat, beaver populations may decline.

Altered Vegetation Dynamics: When elk consume a large amount of vegetation, it can alter the structure and composition of plant communities. This can result in changes in the availability and quality of food sources for beavers. If the preferred vegetation for beavers declines due to heavy grazing by elk, it can negatively impact beaver populations.

Predation Risk: An abundance of elk can attract predators such as wolves and bears, which are known to prey on elk. Increased predation pressure can lead elk to alter their behavior and movement patterns, potentially avoiding areas with higher predator activity. This avoidance behavior by elk can indirectly benefit beavers by reducing the risk of predation. As a result, beaver populations may benefit from the reduced presence of predators associated with high elk populations.

It is important to note that the relationship between elk and beavers is complex and can be influenced by various factors such as ecological interactions, habitat conditions, and predator-prey dynamics. Therefore, the impact of elk on beaver populations in Yellowstone Park may vary depending on specific circumstances and ecosystem dynamics.

Answer:

It has two sigma bonds ( the single bonds between each H and C) plus one pi bond and one sigma bond that consitute the double bond between C and O. It contains three covalent bonds, one . Hydrogen Bond Donor Count: 0: Computed by Cactvs 3.4.

Explanation:

Hope it helps you!

Answer:

D

\( \: \: \: \: \)

Answer:

Intervention of Maillard reactions by the addition of natural and synthetic chemical compounds has previously been directed toward removing one of the reactants (the amino groups or the reducing sugars) or adding sulfur-containing compounds, such as sulfur dioxide or N-acetyl cysteine, which inhibit the reactions

Explanation:

Answer: 2.

Explanation: Because, if you multiply 1.22 by 0.91 or .91, you’ll get 1.1102.

*If this answer doesn’t help, let me know so I can configure this.

The answer is C, Trioxygen

The name for O₃ molecule is trioxygen as it is made up of three oxygen atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Ferrihydrite in forest soil at pH=5 is more likely to sorb benzene than 2,4-D. At pH=4, the sorption potential of 2,4-D to ferrihydrite may be enhanced due to increased positive charge on the surface of the hydroxide.

Ferrihydrite, a type of iron oxide, has the ability to sorb organic compounds through various mechanisms such as surface complexation, hydrogen bonding, and hydrophobic interactions. Benzene, being a non-polar compound, is more likely to sorb to ferrihydrite due to hydrophobic interactions and weak van der Waals forces. On the other hand, 2,4-D, being a polar compound, may have limited sorption to ferrihydrite at pH=5 due to the dominance of repulsive interactions between the negatively charged surface of ferrihydrite and the negatively charged 2,4-D molecule.

At pH=4, the increased positive charge on the surface of ferrihydrite enhances the sorption potential of 2,4-D. The positive charge can attract and bind with the negatively charged 2,4-D molecule through electrostatic interactions. This can result in increased sorption of 2,4-D to ferrihydrite in tropical soils like Qxisol.

Conversely, at pH=9, the increased pH results in a decrease in the positive charge on the surface of ferrihydrite. This reduction in positive charge limits the sorption potential of 2,4-D as the electrostatic attraction between the hydroxide and the 2,4-D molecule decreases. This suggests that in arid soils like Aridisol, characterized by higher pH levels, the sorption potential of 2,4-D to ferrihydrite may be lower compared to humid climates.

The sorption potential of 2,4-D as a function of soil type in humid vs. arid climates can be predicted by considering the pH of the soil. Higher pH in arid soils can lead to reduced sorption of 2,4-D to hydroxides like ferrihydrite or goethite, while lower pH in humid soils can enhance the sorption potential due to increased positive charge on the hydroxide surface.

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Alchemy is an ancient practice that is considered to be the precursor to modern chemistry. It was primarily concerned with the transmutation of base metals into gold, the creation of a universal solvent or elixir of life, and the discovery of a universal cure for diseases. Alchemists believed that these goals could be achieved through a combination of chemical processes and spiritual practices.

One of the key concepts in alchemy is the idea of the "philosopher's stone," a substance that was believed to have the ability to turn base metals into gold and grant eternal life. Alchemists spent centuries searching for the philosopher's stone, experimenting with various substances and processes in an attempt to create it.

Although alchemy is often considered to be a pseudoscience, it did contribute to the development of modern chemistry. Many of the techniques and apparatus used by alchemists, such as distillation and the use of laboratory glassware, are still used in modern chemistry labs.

Additionally, alchemists were among the first to discover and isolate many chemical elements, such as phosphorus and mercury.

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Answer:

C

Explanation:

Because the car is moving forward with an increasing velocity, it has a positive acceleration.

Answer:

Explanation:

Question

Which of the following has a positive acceleration?

A. A car sits at rest at a stop sign.

B. A car is slowing down as it approaches a traffic light. a

C. A car increases its speed moving forward.

D. A car is in cruise control at a constant speed.

Positive acceleration is when there is a positive increase in velocity over time.

C.  is the only choice that shows a positive increase in velocity over time.    

A. and D. show NO change in velocity, while B. shows a negative change.                                                          

Answer:

using a more concentrated potassium hydroxide

Explanation:

The option that would likely increase the rate of reaction would be to use a more concentrated potassium hydroxide.

The concentration of reactants is one of the factors that affect the rate of reaction. The more the concentration of the reactants, the faster the rate of reaction.

Granted that there are enough of the other reactants, increasing the concentration of one of the reactants will lead to an increased rate of reaction.

Hence, using a more concentrated potassium hydroxide which happens to be one of the reactants would likely increase the rate of reaction.

Answer:

using a more concentrated potassium hydroxide

Explanation:

Explanation:

First find the mass of 1 mole of water (Molecular mass)

\( H_{2} O = 2H + O \)

\(

= 2(1) + 32 \)

\(

= 34 \: grams

\)

Hence 1 mole of water is 34 g

Compare

1 mole = 34 g

1.33 mole = x g

\( \frac{x}{34} = \frac{1.33}{1} \)

\(

x = 1.33 \times 34 \)

\(

\color{blue}{\boxed{x = 45.2}} \: \: \: \: to \: 3 \: s.f.

\)

Therefore 1.33 moles of water is 45.2 grams

The mass of the substances can be given by the molar mass and the moles of the substances. The mass of 1.33 mole of water is expressed in grams as, 23.94 grams.

The mass has been defined as the product of the moles of the substance and the molar mass in grams per mole. The mass is given in grams and has a formula,

Moles = mass ÷ molar mass

Mass = molar mass × moles

Given,

Moles = 1.33 moles

Molar mass of water (H₂O) is calculated as = 2 (1) + 16= 18 grams per mole

Using the formula of mole, mass is calculated as:

Mass = molar mass × moles

mass = 1.33 × 18

= 23.94 grams

The mass of the substance can be calculated if the value of the molar mass and the moles of the substance has been known. The molar mass of the substance can be calculated by adding the mass of the individual masses of the element in a molecule.

Therefore, 1.33 mol of water contains 23.94 grams.

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Answer:

Option D

Explanation:

The nucleus of an atom consists of both protons and neutrons

Answer:

d

Explanation:

the nucleus of an atom contains protons and neutrons.

4) The molality of the solution in which the 0.32 moles aluminum chloride has been dissolved in the 2,200 g water is 0.14 m.

5) The mass of water is needed to prepare the 1. 20 molal solution using 0.60 mol of propyleneglycol is 500 g.

4) The molality is expressed as :

Molality = moles of solute / solvent in kg

Where,

Moles = 0.32 moles

Solvent = 2200 g = 2.2 kg

The molality = 0.32 / 2.2

The molality = 0.14 m

5) For the mass of the water needed to prepare the 1.20 molal solution of the propyleneglycol is :

Number of the moles of propyleneglycol = 0.60 mol

The Molality = 1.20 molal

Mass of the water = moles / molality

Mass of the water = 0.60 / 1.20

Mass of the water = 0.5 kg

Mass of the water =  500 g

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THANK YOU SO MUCH!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer:

thank you so much!!

Explanation:

:D

Answer:

Wire.

Explanation:

The wire has movable electrons, which moves the charge and the electricity around.

Battery provides the electricity by electrical potential energy, not transport it.

The switch toggles between an open circuit and a closed one, where only the closed one has a full loop of wire to transport electricity.

And the light bulb uses electricity.

Hope this helped!

Answer:19

Explanation:

The percent by mass : 6.3%

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

mass of potassium nitrate = 8.4 g⇒solute

mass of potassium nitrate + mass of water = 8.4 g + 125 g =133.4 g

Percent by mass of the solute :

\(\tt =\dfrac{mass~solute}{mass~solution}\times 100\%\\\\=\dfrac{8.4}{133.4}\times 100\%\\\\=6.3\%\)

Answer:

Mass = 65.8 g

Explanation:

Given data:

Mass of sodium chloride = ?

Volume of solution = 1.5 L

Molarity of solution = 0.75 M

Solution:

Number of moles of sodium chloride:

Molarity = number of moles / volume in L

By putting values,

0.75 M = number of moles = 1.5 L

Number of moles = 0.75 M × 1.5 L

Number of moles = 1.125 mol

Mass of sodium chloride:

Mass = number of moles × molar mass

Mass = 1.125 mol × 58.5 g/mol

Mass = 65.8 g

The solubility product constant, Ksp, of the aluminum hydroxide, Al(OH)₃ at the temperature is 1.91×10¯³⁹

The solubility of product (Ksp) is defined as the concentration of products raised to their coefficient coefficients. This is illustrated below:

mA <=> nC + eD

Ksp = [C]^n × [D]^e

With the above information in mind, we can obtain the solubility of the product. This is illustrated below:

Al(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)

From the balanced equation above,

1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯

From the balanced equation above,

1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯

Therefore,

2.9×10¯⁹ M Al(OH)₃ will also contain

Concentration of Al³⁺ = 2.9×10¯⁹ M

Concentration of OH¯ = 8.7×10¯⁹ M

Solubility product (Ksp) =?

Al(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)

Ksp = [Al³⁺] × [OH¯]³

Ksp = 2.9×10¯⁹ × (8.7×10¯⁹)³

Ksp = 1.91×10¯³⁹

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The statement "Steady flow devices that result in a drop in working fluid pressure from inlet to exit are: Nozzle, turbine, and throttling device" is TRUE.

1. Nozzle: A nozzle is a device that accelerates the flow of a fluid, causing the pressure to decrease from the inlet to the exit.
2. Turbine: A turbine is a device that extracts energy from a fluid, causing the pressure to drop from the inlet to the exit as the fluid does work on the turbine.
3. Throttling device: A throttling device is a device that restricts the flow of a fluid, causing the pressure to decrease from the inlet to the exit.

All three devices result in a drop in working fluid pressure from the inlet to the exit, making the statement true.

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True. Steady flow devices such as nozzles, turbines, and throttling devices result in a drop in working fluid pressure from inlet to exit.

Steady flow devices are those that operate under steady-state conditions, meaning that the flow rate of the working fluid through the device remains constant. In these devices, the pressure of the working fluid can change as it moves through the device due to various factors such as changes in velocity or cross-sectional area.

Nozzles are devices that are designed to increase the velocity of a fluid while reducing its pressure. They are often used in propulsion systems, where a high-velocity exhaust stream is required to generate thrust.

Turbines, on the other hand, are devices that convert the kinetic energy of a moving fluid into mechanical energy. As the fluid flows through the turbine, it causes the blades to rotate, which can be used to drive a generator or other machinery.

Throttling devices are those that restrict the flow of a fluid, causing a drop in pressure. Examples of throttling devices include valves and restrictions in piping systems.

Therefore, all of these devices result in a drop in working fluid pressure from inlet to exit, making the statement true.

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In a Lewis structure involving iodine and fluorine, if the central iodine atom has exactly one lone pair, so the five Florine atom must be present

A Lewis structure is a very simplified representation of the valence shell electron in a molecule and it is used to show how the electron are arranged around individual atom in a molecule and electron are shown as dot or for bonding electron as a line between the atom and since there is lone pair of electron on the iodine that means precisely 2 of the 7 valence electron are not shared with a fluorine atom and the remaining 5 are each shared with 1 fluorine atom and so there must be 5 fluorine atom surrounding central iodine atom

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Answer:

1. Element - a substance that is made from only one type of atom

An element is made up of only one type of atoms and known for its unique properties than other elements.

2. Heterogeneous -  composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture

3.Homogenous - even distribution of parts throughout the whole mixture; not easily separated into individual components.

4. Product - the substance created as a result of a chemical reaction

Products are the final substance that created as a result of a chemical reaction.

5. Reactant - one of the starting substances (ingredients) that is involved in a chemical reaction

Reactants are the starting substance that takes part in a chemical reaction.

6. Solute - the substance that is being dissolved.

A Solute is a substance that is being dissolved in the solvent to make a solution.

7. Solvent - the substance that does the dissolving

A solvent is the medium in which the solute is being dissolved to make the solution.

A homogeneous mixture, like a solution, has an even distribution of its components throughout the whole mixture. It is not easily separated into individual components. On the other hand, a heterogeneous mixture, like a mixture of oil and water, has dissimilar parts that can be separated easily, and the components are unevenly distributed in the mixture.

1. Reactant: one of the starting substances (ingredients) that is involved in a chemical reaction.
2. Solvent: the substance that does the dissolving.
3. Solute: the substance that is dissolved.
4. Homogeneous: even distribution of parts throughout the whole mixture; not easily separated into individual components.
5. Heterogeneous: composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.
6. Element: a substance that is made from only one type of atom.
7. Product: the substance created as a result of a chemical reaction.

Let's match the terms to their definitions:

1. Element: A substance that is made from only one type of atom.
2. Reactant: One of the starting substances (ingredients) that is involved in a chemical reaction.
3. Product: The substance created as a result of a chemical reaction.
4. Solute: The substance that is dissolved.
5. Solvent: The substance that does the dissolving.
6. Homogeneous: Even distribution of parts throughout the whole mixture; not easily separated into individual components.
7. Heterogeneous: Composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.

For example, if we consider the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O), hydrogen gas and oxygen gas would be the reactants. Water would be the product. In this reaction, hydrogen gas and oxygen gas are the starting substances that undergo a chemical reaction to form water.

In a solution, such as saltwater, the salt (solute) dissolves in the water (solvent). The salt is the substance that is dissolved, and the water is the substance that does the dissolving.

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