How does the plasma membrane stop most substances from crossing it?
The non-polar fatty acid tails form a barrier to polar substances. (ons and polar molecules cannot cross the nonpolar interior of the membrane.)

Answer:

E

Explanation:

equal number of protons and different number of atomic masses/neutrons

Induced dipole intermolecular force is mainly responsible for the boiling point difference between cyclohexane and decalin. Correct answer: letter D.

The difference in boiling point between cyclohexane and decalin is due to the fact that decalin has a longer chain of carbon atoms and therefore has a larger surface area. This larger surface area allows for more intermolecular forces to be formed, specifically induced dipole forces.

These dipole forces are created when the electrons of one molecule are attracted to the nucleus of another molecule, giving rise to a temporary dipole. This attraction between molecules is much stronger than the London dispersion forces that exist in cyclohexane, thus creating a higher boiling point in decalin.

Which intermolecular force do you think is primarily responsible for the difference in boiling point between cyclohexane and decalin?

A) Dipole-Dipole

B) Hydrogen bonding

C) Covalent

D) Induced Dipole

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There were approximately 128.94 g of ZnSO4 and 109.34 g of CoSO4 present in the original solution.

Electroplating is the process of coating a metal object with a thin layer of another metal by means of electrolysis. In an electrolytic cell with a solution of a salt of the metal to be deposited, the item to be plated is made the cathode (negative electrode).

The electroplating of Zn and Co from the solution involves the transfer of electrons from the cathode to the metal ions in the solution, which results in the deposition of the metals on the cathode. The amount of electricity required for this process is proportional to the amount of metal ions present in the solution, which in turn is proportional to the mass of the metals deposited.

Let's first calculate the moles of electrons transferred in the electroplating reaction:

1.436 F × (1 mol e⁻/1 F) = 1.436 mol e⁻

Since the number of electrons transferred is the same for both Zn and Co, the ratio of the moles of Zn and Co deposited should be the same as the ratio of their atomic masses. The atomic masses of Zn and Co are 65.38 g/mol and 58.93 g/mol, respectively, so the ratio of their masses is:

65.38 g/mol ÷ 58.93 g/mol ≈ 1.11

This means that for every 1.11 moles of Zn deposited, 1 mole of Co is deposited.

Let's assume that x moles of ZnSO4 and y moles of CoSO4 were present in the original solution. Then we can set up the following equations based on the balanced electroplating reaction:

2 e⁻ + Zn²+ → Zn (s)

2 e⁻ + Co²+ → Co (s)

The total number of moles of electrons transferred in the electroplating reaction is:

1.436 mol e⁻ = 2 mol e⁻/mol Zn × x mol ZnSO4 + 2 mol e⁻/mol Co × y mol CoSO4

Simplifying and solving for y:

y = (1.436 mol e⁻ - 2 mol e⁻/mol Zn × x mol ZnSO4) / (2 mol e⁻/mol Co)

y = 0.718 mol CoSO4

Since the ratio of the moles of Zn to Co deposited is 1.11, we can calculate the moles of ZnSO4 from the moles of CoSO4:

x = (1.11 mol Zn/mol Co) × (0.718 mol CoSO4) = 0.798 mol ZnSO4

Finally, we can calculate the masses of ZnSO4 and CoSO4:

mass of ZnSO4 = 0.798 mol × 161.47 g/mol = 128.94 g

mass of CoSO4 = 0.718 mol × 152.06 g/mol = 109.34 g

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The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.

When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.

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Modern Atomic Theory states that atoms of one element are the same and that of the different atoms are different. Those atoms elements of the same number of photons.

Hence the option A is correct.

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To prove that oxygen is produced during photosynthesis, the following steps must be performed:

Place aquatic plants in a beaker of pond water.

Cover plants with short-stem funnels.

Invert the test tube filled with water to cover the stem of the funnel. Make sure the water level in the beaker is above the height of the funnel when inserting the

test tube.

Expose the device to sunlight.

After several hours, air bubbles form and collect in the test tube.

test the gas in the test tube.

Glowing debris bursts into flames, indicating the presence of oxygen.

Observation: Gas bubbles are seen in the test tube.

Result: Oxygen is produced

Conclusion: Gas bubbles are formed which prove that oxygen is produced by the green plants during photosynthesis

What is photosynthesis ?

Photosynthesis is the process that plants and other organisms use to convert light energy into chemical energy, which is later released through cellular respiration to power the activity of the organism. Some of this chemical energy is stored in carbohydrate molecules such as sugars and starches synthesized from carbon dioxide and water. Hence, photosynthesis is named 'light' and synthesis is named 'assemble'. Most plants, algae, and cyanobacteria perform photosynthesis. Such organisms are called photoautotrophs. Photosynthesis is largely responsible for the production and maintenance of the oxygen content of the Earth's atmosphere and provides most of the energy needed for life on Earth.

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Consumer goods that Kiara might discuss within her project are Furniture, portable electronics, and beverages. So, Option B is correct.

Consumer goods are products that are purchased by individuals or households for their own use or consumption. They include a wide range of products, such as clothing, electronics, furniture, food and beverages, and personal care items, among others.

While raw materials, automated machinery, and renewable and natural resources are all important components of many consumer goods, they are not consumer goods in and of themselves.

The production of consumer goods, which make up a large portion of the economy, spans a variety of sectors, including manufacturing, agriculture, and retail. Consumer goods producers frequently make significant investments in marketing, branding, and R&D to set their items apart from rivals and draw customers.

Consumer products, both in terms of their functioning and their social and cultural value, can have a big impact on people's lives. For instance, furniture might serve a functional purpose and be comfortable, but it can also convey a person's sense of style and taste.

Similarly, while food and drink are essential for survival, they also have cultural and social importance and can be enjoyed.

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Answer:

I'm pretty sure the answer Is c because I think I remember doing something like that so yeah

The given statement is false because Melting an ionic solid does not always result in an increase in entropy. The change in entropy during the process of melting an ionic solid depends on various factors such as the size and complexity of the ions.

When an ionic solid melts, the crystal lattice breaks down, and the individual ions become mobile in the molten state. This transition from a rigid, ordered structure to a disordered, fluid state generally suggests an increase in entropy. However, there are cases where the entropy may not increase or may even decrease.

Factors that can influence the change in entropy during melting include:

Size and Complexity of Ions: If the ions in the solid are small and simple, the increase in entropy upon melting is generally higher compared to larger and more complex ions. Smaller ions allow for greater freedom of movement, resulting in a larger increase in entropy.

Lattice Structure: The specific arrangement of ions in the crystal lattice can affect the change in entropy. Some crystal structures have more freedom of movement for ions even in the solid state, resulting in lower entropy change upon melting.

Temperature Conditions: The temperature at which the melting occurs can also impact the change in entropy. At higher temperatures, the kinetic energy of the ions increases, leading to greater disorder and increased entropy.

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Answer:

The correct option is;

They can be produced at low cost

Explanation:

In comparison to several other manufacturing materials, some synthetic polymers such as plastics are more durable cost effective, flexible, faster to produce and  reliable

With regards to the cost comparison, the resins used for plastic are cheaper to obtain than mining for materials such as metals. In all quantities, it is cheaper to produce and manufacture plastics than to produce metals.

Due to the light weight and corrosion resistance of plastics, it is cheaper to store and transport plastics to several locations with different environment without the plastic requiring much effort for transportation or being affected by corrosion.

Answer:

d

Explanation:

The cycle of citric acid Hydrogen atoms are transported to FAD during the conversion of succinate to fumarate. This process is catalyzed by a succinate dehydrogenase enzyme.

During the process of succinate dehydrogenation, succinate is oxidized to fumarate by losing electrons, which are transferred to FAD, reducing it to FADH2. This transfer of electrons from succinate to FAD is an oxidation-reduction reaction, also known as redox reaction. The energy released during this reaction is harnessed to generate ATP, which is an important energy currency for the cell. Succinate dehydrogenase is an enzyme complex that contains multiple subunits and cofactors, including flavin adenine dinucleotide (FAD) and iron-sulfur clusters. It is located in the inner mitochondrial membrane, which allows it to transfer electrons to the electron transport chain, leading to the production of ATP. It's important to note that the citric acid cycle is a crucial metabolic pathway that takes place in the mitochondria of eukaryotic cells, and it is also known as the TCA cycle or Krebs cycle. The cycle is a series of chemical reactions that converts acetyl-CoA, derived from carbohydrates, fats, and proteins, into carbon dioxide and water, releasing energy in the form of ATP, hydrogen atoms other high-energy molecules.

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For the reaction to occur, it is necessary that the metal which replaces the metal from the compound LIES above that metal in the ELECTROCHEMICAL SERIES(ECS). The metal in the compound here is Copper (II) nitrate where as the metal trying to displace is silver. Silver lies below the copper in a ECS, that means Copper is more reactive than silver. The reaction is not possible because more reactive metal displaces less reactive metal from its compound, and silver is LESS reactive than copper so it cant displace the copper from copper nitrate.

The primary alkyl halide would proceed with the faster rate of Sn2 reaction.

The rate of Sn2 reaction depends on the nucleophilicity and steric hindrance of the nucleophile, as well as the steric hindrance of the alkyl halide. The less the steric hindrance around the halogen atom, the faster the Sn2 reaction will be. Thus, primary alkyl halides will react faster than secondary and tertiary alkyl halides

The reaction rate in Sn2 reaction is mainly influenced by the steric hindrance of the alkyl halide and the nucleophilicity of the nucleophile. The greater the steric hindrance, the slower the Sn2 reaction will be as the reaction will encounter a larger energy barrier before proceeding. On the other hand, the greater the nucleophilicity, the faster the reaction will be, as a result of the nucleophile's strength in attacking the carbon atom bearing the leaving group.

A primary alkyl halide is the simplest form of an alkyl halide and possesses the least amount of steric hindrance. Because of this, the Sn2 reaction rate will be faster in primary alkyl halides than in secondary and tertiary alkyl halides.

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Cl refer to chlorine atoms. They don't exist naturally in that form. Rather, Cl2 refer to chlorine molecules, and they exist as that form in nature.

A reaction that produces 14.2 grams of a product and the theoretical yield of that product is 17.1 grams is true for the following statements :

The percent yield of the product is 83.0%

The actual yield of the product is 14.2 grams.

Percent yield is the percent ratio of actual yield to the theoretical yield.

Mathematically,

percent yield = actual yield / theoretical yield x 100%

actual yield = 14.2 grams

theoretical yield = 17.1 grams

percentage yield = 14.2 / 17.1 × 100%

percentage yield = 83.0409356725 %

percentage yield = 83.0 %

Therefore,

The percent yield of the product is 83.0%

The actual yield of the product is 14.2 grams.

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Answer:

The empirical formula for a compound is The molar mass of the compound is 93 grams/mole. n=2 is 0

Explanation:

is what I got

Answer:

I'm not 100% sure but I believe it is the first or last

there should be three y's and one x but I can't remember the order. my gut goes with the top one

Answer:

m = 46593.6 g

Explanation:

Given data:

Mass of mercury = ?

Volume of mercury = 3426 mL

Density of mercury = 13.6 g/mL

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

by putting values,

13.6 g/mL = m/ 3426 mL

m =  13.6 g/mL × 3426 mL

m = 46593.6 g

Answer:

it depends on mass and speed

Answer:

In order of the colors of the pH test papers from most acidic solutions to most alkaline solutions, the colors of the pH test papers would be

               Red > Orange/Pink > Purple > Blue

(Red) Most acidic                                (Blue)Most alkaline

Explanation:

We can use the different colors of pH test papers to determine the acidity or alkalinity of a solution.

Definitions

A pH test paper is a strip of indicator paper which changes colour when placed in acidic or alkaline solutions.

A solution is said to be acidic if it turns the colour of the pH test paper RED

A solution is said to be alkaline/basic if it turns the colour of the pH test paper BLUE

Color changes

If the pH test paper turns red, then the solution is a very strongly acidic solution with pH less than 3 ( ie pH between 1-3)

If the pH test paper turns orange or pink, then the solution is a weak acidic solution with pH greater than 3 ut less than 7

If the pH test paper turns purple, then the solution is a weak alkaline solution with pH greater between 8-11

If the pH test paper turns blue, then the solution is a very strong alkaline solution with pH between 11 - 14

Summary

Therefore, in order of color changes from the most acidic solutions to most alkaline solutions, the colors of the pH test papers would be

Red > Orange/Pink > Purple > Blue

Most acidic                                Most alkaline

Answer:

d<c<a<b

Explanation:

Answer:

Copper has gained 2 electrons

Copper has been reduced

Explanation:

The oxidation state of Cu goes from 2+ to 0, meaning it gains 2 electrons (they each have -1 charge);

This is known as reduction

Pneumonic OILRIG:

Oxidation is Loss, Reduction is Gain

Oxidation is the loss of electrons

Reduction is the gain of electrons

Cu2+ gains 2 electrons, thus it is reduced

The volume percentage of a 0.5634 m ch3cooh (acetic acid) solution, if pure acetic acid has a density of 1.050 g/ml is 54.06%.

Volume is a measure of the amount of space an object occupies or contains. It is usually measured in cubic units, such as cubic feet or cubic centimeters.

The volume percentage of 0.5634 m CH3COOH (acetic acid) solution is calculated by dividing the molarity (M) of the solution by the molarity of the pure acetic acid (M = 1.050 g/ml). This yields a volume percentage of 54.06%. To convert this to a decimal, the formula is:

Volume Percentage = (M / M of Pure Acetic Acid) x 100

= (0.5634 / 1.050) x 100

= 54.06%

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Answer:

6.95 x 10²³ molecules/particles

Explanation:

First we need to find the total Empirical Mass. We can find this by adding each element's mass together.

Al = 26.982,

O = 15.999

H = 1.008

26.982 + 3(15.999) + 3(1.008) = 78.003.

Now we divide by the mass given (90 grams).

90/78.003 = 1.153801777.

We then take that number and multiply it by avogadro's number (6.022 x 10²³)

1.153801777 x avogadro's number = 6.95 x 10²³

The energy transformation is, Electrical to light. The answer is C.

When a battery-powered flashlight is turned on, electrical energy from the battery is transformed into light energy through a process called electroluminescence. Inside the flashlight, a circuit is completed when the switch is turned on, allowing electrical current to flow from the battery through a wire to a light bulb or LED (light-emitting diode). The electrical energy is converted into light energy, which illuminates the area around the flashlight.

The battery's chemical energy is not directly transformed into light, but rather is used to generate electrical energy that is then transformed into light. Hence option C is correct.

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--The complete question is, When a battery-powered flashlight is turned on, what type of energy transformation takes place?

A. Chemical to thermal

B. Electrical to thermal

C. Electrical to light

D. Chemical to light--

Answer:

i hope it will help you ..

In the decomposition reaction where \(CaCO_3\) breaks down to form CaO and \(CO_2\) , the rate of reaction can be measured by the formation of \(CO_2\)  over time. This is because the production of CO2 is directly related to the progress of the reaction.

As the \(CaCO_3\) decomposes, \(CO_2\) is released as a product. By monitoring the amount of \(CO_2\)  formed over a specific period of time, we can determine the rate at which the reaction is occurring. This can be achieved through various techniques such as gas collection or gas chromatography. Measuring the rate of reaction based on the formation of \(CO_2\)  is advantageous because it provides a direct and measurable indicator of the progress of the reaction. The amount of \(CO_2\)  formed correlates with the consumption of \(CaCO_3\) and the generation of CaO. By monitoring the rate of \(CO_2\) production, we can analyze the factors that affect the rate of the reaction, such as temperature, concentration, or the presence of a catalyst. In summary, the rate of the decomposition reaction can be measured by monitoring the formation of \(CO_2\) over time. This approach provides a practical and quantitative way to assess the progress of the reaction and investigate the factors that influence its rate.

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Answer:

309041.2

Explanation:

1. The Earth revolves around the Sun. Theory: This is a scientific theory, which is an explanation supported by a large body of evidence that explains how a natural phenomenon or phenomenon works.

A theory is an explanation or principle that is based on observations, experiments, and logical reasoning. It is an organized system of ideas, concepts, and principles intended to explain how something works or why something happens. Theories are used to explain and predict phenomena and can be used to develop hypotheses, which can then be tested to gain a better understanding of the natural or social world. Theories can be used to understand and explain a wide variety of phenomena in the natural and social sciences, including the behavior of particles, the functioning of the human body, and the social dynamics of large groups of people.

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Answer:

they pull or push on objects without touching them

Explanation: