What mass of co2 is produced when 25.00 ml sample of ethanol (density = 0.789 g/ml) combusts?

The effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

1. The class of drugs being investigated in this study is antidepressants. They enter our waterways through excretion by individuals taking the medication, and disposal of unused medication into toilets or sinks that are connected to wastewater treatment plants.

2. C-start is an evasive maneuver that young fish use when they perceive a predator. This is important for larval fish survival because it helps them to avoid being eaten by predators.

3. In this investigation, researchers are testing two hypotheses. The first is that exposure to low levels of antidepressants can affect larval fathead minnows' behavior, and the second is that the effects of exposure will be more pronounced in fish that have been raised in a less stressful environment.

4. The researchers found that exposure to antidepressants at levels found in waterways can have a significant impact on the behavior of larval fathead minnows. Specifically, they found that the fish exposed to antidepressants were less likely to respond to the presence of predators, which could increase their risk of being eaten.

They also found that the effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

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Answer: C.  Waves don't move matter, just energy.

Explanation:

Answer:

Explanation:

we dream because when our bodies are taking memories into long term, the memories from that day or the day before collide and make dreams. that is why they resemble things that have happened to us.

Answer:

One widely held theory about the purpose of dreams is that they help you store important memories and things you've learned, get rid of unimportant memories, and sort through complicated thoughts and feelings. Research shows that sleep helps store memories.

The brain is so active when we dream that it is virtually indistinguishable from a brain in the waking state. Even so, the chemistry of it is entirely rewired when we sleep. Many scientists attribute this to the reason dreams are so strange and bizarre.

Explanation:

According to electronic configuration, the correct symbol for sodium with 4 neutrons, 3 protons, and 2 electrons is Na-2.

What is electronic configuration?

The distribution of electrons in atomic or molecular orbitals within an atom or molecule is referred to as its electronic configuration. It explains how every electron in an orbital move on its own.

For understanding the period table, one needs to know about electronic configuration. It aids in comprehending the chemistry of various elements.

For an element to become stable, chemical reactions must take place. The transition elements adhere to the 18-electron rule, whereas the main group elements follow the octet rule in their electrical arrangement. Noble elements are thought to be stable because their valence shells are finished in the ground state.

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Answer:

the emprircsl formula is: CH2O

Explanation:

Less evaporation means that less of the sun's energy is used to convert water into water vapor, and more of it is used to heat up the surface. In urban areas, there is typically less vegetation and more impervious surfaces (such as concrete and asphalt), which reduces the amount of water that can evaporate.

This means that more of the sun's energy is absorbed by the surface, leading to higher temperatures. Additionally, buildings and other structures in urban areas can trap heat and prevent it from dissipating, further contributing to the urban heat island effect.

In rural areas, vegetation and soil moisture play an important role in regulating temperature through a process called evapotranspiration. Evapotranspiration is the combined process of water evaporation from the soil and plant transpiration. It helps to cool the air by removing heat from the surface through the transfer of water from the surface to the atmosphere.

In contrast, urban areas have a significant amount of impervious surfaces like concrete, asphalt, and buildings, which reduce the amount of vegetation and soil moisture. As a result, urban areas have less evapotranspiration, which means less cooling effect from the evaporation of water. This leads to a higher surface temperature in urban areas.

Furthermore, urban areas have a higher proportion of dark-colored surfaces, such as asphalt and concrete, which absorb more solar radiation than lighter-colored surfaces like vegetation and soil. This is known as the "urban heat island effect," which further contributes to higher temperatures in urban areas.

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Answer:

It's chemical property of iron

Explanation:

In the presence of moisture, iron can rust

Answer:

Óxido de magnesio

Concepto:Es un óxido metálico, formado por magnesio y oxígeno, de estructura iónica cuya fórmula química es MgO.

The formation of molecule can easily be shown by drawing Lewis dot structure. Therefore, SiH\(_3\)⁻ will have  1 lone pair as well as it has a negative formal charge.

Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.

Si belongs to group 14 of periodic table that is carbon family, so valence electron is 4. One electron is added to this due to one negative charge over the compound. Out of 5 unpaired electron, 3 covalent bond is formed with one electron of hydrogen. Two electron is left over silicon. 1 lone pair as well as it has a negative formal charge.

Therefore, SiH\(_3\)⁻ will have  1 lone pair as well as it has a negative formal charge.

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A solution of HNO₃ with a hydrogen ion content of 0.65 M has a pH of 0.19.

Nitric acid (HNO₃) is a useful chemical that is employed in the production of fertilisers, dyes, drugs, and explosives. This acid's pH is required to calculate. A pH of less than 7 is acidic. Nitric acid's hydrogen ion concentration of 0.65 M has to be used to calculate the pH. The formula for the calculation of pH is given below:

pH = -log[H⁺] [H⁺] is equal to 0.65 M

pH can be computed using this formula:

pH = -log[H⁺]

pH = -log[0.65]

pH = 0.187

pH=0.19

Hence, the pH of a HNO₃ solution having a hydrogen ion concentration of 0.65 M is 0.19.

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Answer:

the answer is the third figure from left

Answer:

A, C, E

Explanation:

hope this helps

The true statements are - Cells come in different sizes and shapes, some organisms are made of just one cell and most cells are too small to see with the eye. Thus, the correct options are options A, C and E.

Cells are the basic structural and functional units of life. They are the smallest entities that can carry out the fundamental processes necessary for an organism's survival.

Cells are enclosed by a cell membrane, which separates the internal components from the external environment. Inside the cell, various parts perform specific functions, such as energy production, protein synthesis, and storage of genetic material.

Cells can be categorized into two broad types: prokaryotic cells, which lack a nucleus and eukaryotic cells, which have a nucleus.

Thus, the ideal selection is option A, C and E.

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A measure of how much solute can dissolve in a given amount of solvent. A substance's solubility in water is the greatest amount of that material that can dissolve in 100 grams of water at a specific temperature. The solubility of BaCrO₄ is 2.787.

The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant, Ksp. It stands for the degree of solute dissolution in solution. A substance's Ksp value increases with how soluble it is.

Ksp = [Ba²⁺][CrO₄²⁻]

Ksp = S × S

S² = Ksp

\(S=(K_{sp} )^{1/2}\)

\(S=(1.2 * 10^{-10} )^{1/2}\)

\(S=1.10*10^{-5} mol/L\)

[Ba²⁺] = 1.10 × 10⁻⁵ mol/L

[CrO₄²⁻] = 1.10 × 10⁻⁵ mol/L

ppm = Molarity × molecular mass × 1000

ppm = 1.10 × 10⁻⁵ × 253.37 × 1000

ppm = 2.787

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Your question is incomplete, the complete question is:

what is the solubility of barium chromate in parts per million if the value of Ksp is 1.2×10⁻¹⁰.

Answer:

Exothermic reaction

Explanation:

Since in an exothermic reaction heat is released, the products will be more stable than the reactants.

a. The balls were most likely mothballs, which are commonly made of naphthalene or paradichlorobenzene.

b. The balls disappeared/decreased in size due to sublimation, where they transitioned from solid to gas without becoming a liquid.

c. The purpose of putting the balls along with clothes was to repel moths and other insects, protecting the woolen clothes from damage during storage.

a. The composition of the balls was most likely mothballs, which are typically made of a chemical compound called naphthalene or paradichlorobenzene.

b. The balls disappeared or decreased in size due to sublimation. Mothballs undergo a process called sublimation, where they transition from a solid to a gas state without going through the liquid phase. This means that over time, the mothballs slowly vaporize and dissipate into the air, resulting in their decrease in size or disappearance.

c. The purpose of putting those balls along with clothes was to prevent damage from moths and other insects. Mothballs contain chemicals that release a strong odor, which is unpleasant to insects. The odor acts as a deterrent and helps protect the clothes from being damaged by moth larvae or other pests that feed on natural fibers like wool. By placing the mothballs in the storage area, it creates an environment that repels these insects and helps preserve the quality of the woollen clothes during storage.

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Increasing the temperature in the exothermic production of ammonia from its elements, known as the Haber-Bosch process, affects both the reaction rate and yield. Reaction rate typically increases with an increase in temperature. This is due to the fact that higher temperatures provide more thermal energy to the reactant molecules, enabling them to overcome the activation energy barrier more easily. As a result, more productive collisions occur between the reacting species, leading to a faster reaction rate.

However, the yield of the ammonia production is influenced by temperature in a slightly different manner. While the reaction rate may increase, a higher temperature can also cause a decrease in the equilibrium yield of ammonia. This is because the Haber-Bosch process is an equilibrium reaction, and according to Le Chatelier's principle, increasing the temperature will favor the endothermic direction of the reaction. In this case, it means that the equilibrium will shift towards the reactant side, resulting in a lower yield of ammonia. Therefore, there is a trade-off between reaction rate and yield when adjusting the temperature in the Haber-Bosch process. The optimal temperature is usually chosen to maximize the yield while maintaining a reasonable reaction rate for efficient production.

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The standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm would be -36.9 kJ. This reaction is product-favored under standard conditions at 308 K.

To calculate the standard free energy change (ΔG°) for the reaction, we can use the equation:

ΔG° = ΔH° - TΔS°

Given that ΔH°rxn = -206.1 kJ and ΔS°rxn = -214.7 J/K, we need to convert the values to kJ and adjust the sign for ΔS°:

ΔH°rxn = -206.1 kJ

ΔS°rxn = -214.7 J/K = -0.2147 kJ/K

Now we can substitute these values into the equation:

ΔG° = -206.1 kJ - (308 K)(-0.2147 kJ/K)

    = -206.1 kJ + 66.1736 kJ

    = -139.9264 kJ

Since the question asks for the standard free energy change for 1.78 moles of CO(g), we need to calculate the moles of CO(g) in the reaction:

1 mole of CO(g) reacts to form 1 mole of CH₄(g)

1.78 moles of CO(g) will react to form 1.78 moles of CH₄(g)

Therefore, the standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm is -139.9264 kJ.

Based on the negative value of ΔG°, the reaction is product-favored under standard conditions at 308 K.

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Answer:

ethene

Explanation:

as in ethene there is presence of double carbon which is commonly known as alkene group

The Haber process involves the following steps:

Preparation of reactants; Compression of gases; Mixing of gases; Reaction; Separation of ammonia; Separation of ammonia

The Haber process is a method used to manufacture ammonia (NH3) from nitrogen gas (N2) and hydrogen gas (H2). The process is named after its inventor, German chemist Fritz Haber, who developed the process in the early 20th century.

The Haber process involves the following steps

The Haber process is an important industrial process for the production of ammonia, which is a vital ingredient in the production of fertilizers and many other chemical compounds.

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This is incorrect because the ice has changed its composition.

A melting ice cube takes on a different shape as it begins to flow. Its makeup doesn't alter, though.

A physical change is an example of melting. A physical change is when a sample of matter undergoes a change that affects some of the material's attributes but not its identity.

The term "physical change" refers to the tearing, breaking, grinding, changing the state of matter, and dissolving of a substance. Exothermic reactions' opponent is known as an endothermic reaction. From their surroundings, they take in heat energy. This indicates that endothermic reactions make their surroundings colder as a result of the reaction. This sort of response can be seen in the melting of ice.

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250 grams of Mix A (MxA) should be used to obtain the right diet for one animal.

To determine the number of grams of Mix A (MxA) needed to obtain the right diet for one animal, let's assume that x represents the number of grams of MxA used.

The protein content in MxA is 10%, which means 0.10x grams of protein will be obtained from MxA.

The fat content in MxA is 6%, which means 0.06x grams of fat will be obtained from MxA.

Since the desired diet for one animal should consist of 25 grams of protein and 5 grams of fat, we can set up the following equation based on the protein content:

0.10x = 25

Solving for x:

x = 25 / 0.10

x = 250 grams.

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Answer:

a. pH = 2.22.

b. [H+] = 2.588 x 10⁻⁴ mol/L.

Explanation:

Acids and Bases => Calculating pH of Acids and Bases.

As we saw before, the formulas to find the pH based on the hydrogen ion concentration [H+], and to find the hydrogen ion concentration [H+] based on the pH are the following, respectively:

So let's see each case:

a. To find the pH of an H+ concentration of 6.02 x 10⁻³ mol/L we use the pH formula:

The answer would be that the pH is 2.22.

b. To find the H+ concentration of a pH of 3.587, we use the [H+] formula:

The answer would be that the hydrogen ion concentration [H+] = 2.588 x 10⁻⁴ mol/L.

Answer:

hiroghlipical

Explanation:

new word i just made

Answer: 3510 J

Explanation:

q = m x Cs x delta T

m = 28.0 g

Cs = 4.18 J/g x ⁰C

delta T = Final temperature - Initial temperature = 60.0⁰C - 30.0⁰C = 30.0⁰C

q = m x Cs x delta T

q = 28.0 g x (4.18 J/g x ⁰C) x 30.0⁰C = 3511.2 J

3510 J for the correct number of significant figures.

Grams and ⁰C cancel and you are left with Joules.

Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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When comparing a copper cylinder and a wooden cylinder, the method of comparison that gives more useful results is dimensional analysis.

This method involves analyzing the dimensions of the two objects, such as their size, shape, and weight. The dimensions of an object can provide valuable insights into its properties, such as its strength, durability, and heat conductivity. For example, when comparing a copper cylinder and a wooden cylinder, the copper cylinder will likely have a greater density than the wooden cylinder due to its higher mass.

This means that the copper cylinder will be stronger and more durable than the wooden cylinder, making it a better choice for applications that require strength and durability. The dimensions of the two cylinders can also provide insights into their thermal conductivity. Copper is known for its excellent thermal conductivity, making it a good choice for heat sinks and other applications where thermal management is important. In contrast, wood is a poor thermal conductor, making it a poor choice for such applications.

Therefore, by using dimensional analysis, we can compare the properties of the two cylinders and determine which one is best suited for a particular application.

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Deprotonation of phenol by NaOHPhenol is a weak acid with a pKa value of 10, so it is not very acidic but it can be deprotonated with a strong base like sodium hydroxide (NaOH). The mechanism for this reaction is a simple acid-base reaction where NaOH acts as a base and removes the proton (H+) from phenol.

The curved arrow mechanism is shown below:Here, the Na+ ion comes in and removes the H+ ion from the O-H bond in phenol and forms water as a by-product. The major organic product is phenoxide ion (C6H5O−) which is formed after the deprotonation reaction.SN2 reaction of phenoxide with chloroethane Phenoxide ion is a good nucleophile because it has a negative charge on the oxygen atom which is able to attack the positively charged carbon atom in chloroethane. The mechanism for this reaction is a nucleophilic substitution (SN2) reaction where the phenoxide ion acts as a nucleophile and replaces the chloride ion in chloroethane. The curved arrow mechanism is shown below:Here, the phenoxide ion attacks the carbon atom in chloroethane, and the chloride ion leaves as a leaving group. The major organic product is ethyl phenyl ether (C6H5OC2H5) which is formed after the SN2 reaction.

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Answer:

Its either B or D. I personally would go with B

Explanation:

A food web describes a system that is made up of a community of organisms and their environment. Therefore, option B is correct.

A food web is a diagram that shows what is eaten by what in an ecological community and how food chains naturally connect to one another. Consumer-resource system is another term for the food web.

A food web is a comprehensive account of the species that make up a community and their interactions with one another. It demonstrates how energy is moved along food chains that are connected to other food chains.

The study of top-down or bottom-up control of community structure can be done using food webs. The energy exchange between primary producers and primary consumers (herbivores) and between primary consumers and secondary consumers is shown through food webs (carnivores).

Thus, option B is correct.

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Answer:

12g

Explanation:

The following equation is given in this question:

2H2 + O2 → 2H2O

According to this balanced chemical equation, 2 moles of hydrogen gas is used to produce 2 moles of water molecule.

Hence, if 12 grams of hydrogen is used, 12 × 2/2 = 24/2

= 12 grams of H2O will be produced.