PLEASEE HELP ME I CANT GET THIS WRONG

Answer: cooling

Explanation:

Answer:

cooling

Explanation:

The coefficient of water in the balanced equation is 7.  Option C is correct.

Balanced chemical equation for the given reaction in acidic solution is;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 12H₂O(l)

To balance the equation, we start by balancing the oxygen atoms by adding water molecules to the appropriate side;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 7H₂O(l)

Now, we balance the hydrogen atoms by adding H+ ions to the appropriate side;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 7H₂O(l)

Finally, we balance the charge by adding electrons to the appropriate side;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 7H₂O(l) + 14e⁻

Therefore, the coefficient of water is 7.

Hence, C. is the correct option.

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Answer:

0.003221

Explanation:

When we multiply anything by 10 times a power, we follow the base 10 decimal system.

To convert 3.221 × 10⁻³ from scientific notation to standard notation, simply move the decimal place 3 places to the left:

3.221 × 10⁻³ = 0.003221

The Let's analyze the reactions you provided and determine if they absorb or release energy. Reaction 1 Leg → Leg + e.
This reaction represents the ionization of lithium, where an electron is removed from the gaseous lithium atom.

The energy needed for this process is given by the ionization energy. For lithium, the ionization energy is 520.2 kJ/mol. Since energy is required to remove the electron, this reaction absorbs energy. Answer for Reaction 1 Absorb, 520.2 kJ/mol. Reaction 2 Leg + e → Leg This reaction is the opposite of Reaction 1 and represents an electron being added to the gaseous lithium atom. The energy change for this process is given by the electron affinity. For lithium, the electron affinity is 59.6 kJ/mol. Since energy is released when the electron is added, this reaction releases energy. Answer for Reaction 2 Release, 59.6 kJ/mol.

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The comparison between the class barometer data and the air pressure shown in the weather report serves as a means to evaluate the accuracy and effectiveness of the barometer's measurements.

The comparison between the data from the class barometer and the air pressure shown in the weather report revealed a correlation between the two measurements. The class barometer readings were likely taken at the same time as the weather report's air pressure measurement to ensure accurate comparison.

If the class barometer readings closely matched the air pressure indicated in the weather report, it would suggest that the barometer was functioning correctly and providing reliable measurements. This would indicate that the class barometer could be used as a reliable tool for monitoring air pressure changes.

However, if there were significant discrepancies between the class barometer readings and the air pressure reported in the weather report, it could indicate a calibration issue with the barometer or potential inaccuracies in its measurements. In such a case, it would be necessary to investigate the reasons behind the discrepancies and determine the reliability of the class barometer for future use. It helps to determine the barometer's reliability as a tool for monitoring air pressure changes in the local environment.

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The traits that the offspring got were taken from the parents.

Offspring get traits from their parents through the process of inheritance. Traits are determined by genes, which are segments of DNA that contain the instructions for building and maintaining an organism's body and traits.

Each parent contributes half of their genes to their offspring through their gametes, which are reproductive cells such as sperm and eggs. When a sperm fertilizes an egg, the resulting zygote has a complete set of genes from both parents.

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Answer:

frozen

Explanation:

I would say because when u freeze water it expands and denifys.

Answer:

One change of state happens when you add energy to the substance. This change of state is called melting. By adding energy to the molecules in a solid the molecules begin to move quicker and can break away from the other molecules.

The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Option B is Correct The object slows down the entire time because its velocity is negative the entire time.

In the theory of special relativity, time dilation is the "slowing down" of a clock as perceived by an observer who is moving relative to the clock.

An object experiences acceleration whenever it accelerates, decelerates, or changes direction. Acceleration is the rate at which the velocity of an object varies in relation to time. Moreover, the velocity has the power to alter both the object's speed and its direction.

The position, speed, direction, and acceleration of an object can all be used to characterise its motion. If an object's position with relation to a fixed point is shifting, it is said to be moving. Even seemingly motionless objects move. Deceleration is the slowing down (reduction) of an object's velocity. A negative acceleration could likewise serve as a representation.

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the aldol condensation of menthone and anisaldehyde can be monitored by tlc and each starting material and product gave a distinct spot on the plate.

if the Rf value is low the concentration is higher if the Rf value is high its highly soluble and will move faster.

Aldol condensation is a term used to describe a chemical reaction in which an enolate ion combines with a carbonyl compound to produce either a hydroxy ketone or an aldehyde, which is then dehydrated to produce a conjugated enone.

After running a TLC, scientists frequently cannot simply see where compounds are situated since organic compounds typically appear colorless on the white background of a TLC plate. After elution, the chemicals must be momentarily transformed into something visible, or "visualized."

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When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.

In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.

The chemical equation for the given reaction is:

\(Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Put the necessary stoichiometric coefficient to balance each element.

Balancing Na:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Balancing P:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Balancing S:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Notice that H and O are already balanced.

Hence, the balanced chemical equation for the reaction is:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

where 3 is the stoichiometric coefficient of sulfuric acid, \(H_{2} SO_{4}\).

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Answer: sigma bond

Represents two electrons

Explanation:

E2020

Answer:

Sigma Bond AND Represents two electrons.

Explanation:

Perchlorate is used in rocket fuel affects the thyroid gland.

Perchlorate, a chemical substance used in rocket fuel, fireworks, fertilisers, and other products, is one such contaminant.

Since it prevents the sodium/iodide symporter (NIS), a protein that transports iodide into the thyroid and other tissues, perchlorate is associated with thyroid disorders. Hypothyroidism, which can be brought on by decreased iodide uptake, can be extremely harmful for infants since it directly impacts how they develop in numerous ways.

Thyroxine (also known as T4), a relatively inactive prohormone, and triiodothyronine, a highly active hormone, are both produced by the thyroid gland (referred to as T3). The thyroid hormones are thyroxine and triiodothyronine taken together.

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The complete question is

Which chemical used in rocket fuel affects the thyroid gland?

A. Reproductive hormones

B. DDT

C. PCBs

D. PBDEs

E. Perchlorates

Answer: A food chain describes how energy and nutrients move through an ecosystem. At the basic level there are plants that produce the energy, then it moves up to higher-level organisms like herbivores. ... In the food chain, energy is transferred from one living organism through another in the form of food.  In ecology, a food chain is a series of organisms that eat one another so that energy and nutrients flow from one to the next. For example, if you had a hamburger for lunch, you might be part of a food chain that looks like this: grass rightarrow→right arrow cow rightarrow→right arrow human. But what if you had lettuce on your hamburger? In that case, you're also part of a food chain that looks like this: lettuce rightarrow→right arrow human

Explanation:

A table that organizes elements based on their atomic numbers and protein and electron's and nuetrons

Explanation:

LITTERLY the answer

Water molecules that surround a less polar molecule in solution are immobile and ordered.

Water is good at dissolving ions and polar molecules, but it is poor at dissolving non-polar molecules. Water makes an excellent solvent because of its polarity and ability to form the hydrogen ions.

Polar molecules have the electric charges which are unequally distributed. Water forms the electrostatic interactions which are charge-based attractions with the other polar molecules and ions, due to its polarity.

Hydrogen carries a partial positive charge and oxygen with partial negative charge. Oxygen having partial negative charge  and hydrogen having partial positive charge results in the polarity of the molecule.

The less polar molecules and ions interact with the water, the partially positive and partially negative ends of water. The positive charges attracts negative charges, thus leading it to be immobile and ordered.

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Answer:

3m/s²

Explanation:

Force applied to an object can be calculated thus;

F = ma

Where;

F = force applied (Newtons)

m = mass of substance (kg)

a = acceleration (m/s²)

According to the information provided in this question, F = 12.0 newtons, m = 4.0 kg, a = ?

Derived from F = m.a

We have; a = F/m

a = 12/4

a = 3

The resultant acceleration of the object is 3m/s².

Answer:they use cellular respiration to transform the glucose molecules they make into energy they can use for carrying out life's processes

Explanation:

After the death of the Buddha, Buddhism became a formal religion through the efforts of his followers, who continued to spread his teachings and organized into communities known as sanghas. Over time, these sanghas developed a system of governance, with monastic councils, hierarchical structures, and formalized practices and rituals.

One key factor in the formalization of Buddhism was the development of the Tripitaka, a collection of the Buddha's teachings, which were written down in the Pali language and preserved by monastic communities. The Tripitaka contains three major sections: the Vinaya Pitaka, which outlines the rules and guidelines for monastic life; the Sutta Pitaka, which contains the Buddha's discourses on a wide range of topics; and the Abhidhamma Pitaka, which provides a detailed analysis of Buddhist psychology and philosophy.
The spread of Buddhism was also facilitated by the patronage of rulers such as Asoka, who supported the religion and helped to spread it throughout his empire. However, this support was not always consistent, and Buddhism faced periods of persecution and decline in various parts of the world. Despite these challenges, Buddhism has continued to evolve and adapt over the centuries, with different schools and traditions emerging in different regions. Today, Buddhism is practiced by millions of people around the world, and continues to offer a unique and powerful perspective on the nature of reality, the human condition, and the path to liberation.

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Answer:

A

Explanation:

An unbalanced force is your answer.

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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The correct set of coefficients, in order, to balance the equation is: 3, 9, 3, 6. Therefore, option (A) is correct.

To balance the chemical equation \(Al_{2}O_{3}\)+ Fe → \(Fe_{3}O_{4}\) + Al, we need to determine the coefficients that ensure the same number of atoms for each element on both sides of the equation.

In the given answer, A. 3, 9, 3, 6, the coefficients indicate that three molecules of aluminum oxide (\(Al_{2}O_{3}\)) and nine atoms of iron (Fe) react to form three molecules of iron(III) oxide (\(Fe_{3}O_{4}\)) and six atoms of aluminum (Al).

By balancing the equation with these coefficients, we ensure that the number of atoms of each element is conserved. This means that no atoms are gained or lost during the reaction, satisfying the principle of conservation of mass.

Balancing equations is crucial for accurately representing chemical reactions, as it ensures that the reactants and products are in the correct stoichiometric ratios and reflects the conservation of atoms.

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When a parcel of air expands and cools, or compresses and warms, with no interchange of heat with its outside surroundings, this situation is called d. Adiabatic.

Temperature adjustments in each ascending and descending air parcels arise with none sizable warmth alternate among the encompassing surroundings and the vertically shifting parcel of air. The warming and cooling costs for a parcel of increasing or compressing air are termed adiabatic. An adiabatic technique is one in which no warmth is exchanged among an air parcel and the encompassing air. When we communicate approximately an adiabatic technique withinside the present day context we're speaking approximately a rising (or sinking) parcel of air that isn't always replacing any warmth with its surroundings.

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Taking into account the reaction stoichiometry, 1.245 moles of O₂ is required to react and 0.83 moles of N₂ are formed when 1.66 moles of NH₃ react.

In first place, the balanced reaction is:

4 NH₃ + 3 O₂ → 2 N₂ + 6 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 4 moles of NH₃ react with 3 moles of O₂, 1.66 moles of NH₃ react with how many moles of O₂?

moles of O₂= (1.66 moles of NH₃× 3 moles of O₂)÷ 4 moles of NH₃

moles of O₂= 1.245 moles

Finally, 1.245 moles of O₂ is required to react.

The following rule of three can be applied: if by reaction stoichiometry 4 moles of NH₃ form 2 moles of N₂, 1.66 moles of NH₃ form how many moles of N₂?

moles of N₂= (1.66 moles of NH₃× 2 moles of N₂)÷ 4 moles of NH₃

moles of N₂= 0.83 moles

Finally, 0.83 moles of N₂ are formed.

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Answer:

Base

Explanation:

Why is Alka-Seltzer a base?

Alka-Seltzer contains sodium bicarbonate and citric acid. The sodium citrate acts as an antacid. Excess sodium bicarbonate from the Alka-Seltzer acts to neutralize base.

Explanation:

If the solution has a pH of 2, then the pOH is 12; the concentration of hydrogen ions would be 10-2 M and the concentration of hydroxide ions would be 10-12 M.

Given :

A student has a 1 g sample of each of the following compounds: NaCl, KBr, and KCl.

To Find :

The samples in order of increasing number of moles in the sample.

Solution :

Molecular mass of NaCl, KBr, and KCl is 58.5 g/mol , 119 g/mol and

74.5 g/mol respectively .

Moles of NaCl , \(n_1=\dfrac{1}{58.5}=0.017\ mol\).

Moles of KBr , \(n_2=\dfrac{1}{119}=0.008\ mol\).

Moles of KCl , \(n_2=\dfrac{1}{74.5}=0.013\ mol\).

The order of moles in increasing order is :

KBr , KCl and NaCl .

Hence , this is the required solution .

The increasing order of the moles in sample has been, KBr < KCl < NaCl.

The moles of sample have been defined as the mass of sample with respect to  molar mass. The moles of sample have been given by:

\(\text {Moles}=\dfrac{\text {mass}}{mwt}\)

The molecular mass of the sample has been given by mwt.

The moles in 1 g mass of the following samples has been given by:

\(\rm Moles=\dfrac{1}{58.44}\\Moies=0.017\;mol\)

1 gram sample of NaCl has been 0.017  mol.

\(\rm Moles=\dfrac{1}{119.002} \\Moles=0.008\;mol\)

1 gram sample of KBr has been 0.008 mol.

\(\rm Moles=\dfrac{1}{74.5513} \\Moles=0.013\;mol\)

1 gram sample of KCl has been 0.0.13 mol.

The increasing order of the moles in sample has been, KBr < KCl < NaCl.

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