Choose the chemical equation that is correctly balanced.

Answer:

Incorrect

Explanation:

X is the reactants

Y is the products

In an endothermic reaction where energy is absorbed, the enthalpy the products (Y) is always higher than the enthalpy of the reactants (X).

Enthalpy change (∆H) = products (Y) - Reactants (X)

For an endothermic reaction, the ∆H value should be positive.

Enthalpy change

The diagram sketched by the students shows the opposite. The diagram shows that the enthalpy of the products (Y) is lower than the enthalpy of the reactants (X). This will give a negative value of ∆H.

It represents an exothermic reaction rather than endothermic.

Therefore, the student is incorrect.

To convert (CH3CH2)3CC=CH, the following reagents are needed:
1) Hydrogen gas (H2)
2) A catalyst, such as platinum (Pt) or palladium (Pd)

The reaction is as follows:
(CH3CH2)3CC=CH + H2 → (CH3CH2)3CCH2CH3

This reaction is known as hydrogenation, in which hydrogen is added to a double bond to convert it to a single bond. The catalyst is needed to speed up the reaction and make it more efficient.

In summary, the reagents needed to convert (CH3CH2)3CC=CH are hydrogen gas (H2) and a catalyst (Pt or Pd).

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Water, a naturally occurring and vital component for life on Earth, is really known chemically as dihydrogen monoxide (DHMO). When consumed in moderation, it is not dangerous.

The claim you made appears to be a well-known internet hoax that has been circulated for a while. It is frequently used in jokes and satire to highlight how quickly false information and fear-mongering can spread.

It is crucial to rely on reliable sources and scientific facts when analyzing information, especially when it comes to health and safety, to address your concern. To assist people in recognizing and avoiding misleading or inaccurate information, it is also crucial to encourage critical thinking and media literacy.

In other words, since dihydrogen monoxide is a fundamental substance required for existence, there is nothing to "repair" in regard to it. Instead, in order to assure accurate and trustworthy knowledge, we should concentrate on information verification and the advancement of scientific literacy.

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Answer:

x+y = 12

Explanation:

shfb gfgjj ghjj dvgg ggggg ghggs ufac t g dgyyh

Answer:

In the elemental form, non-metals can be gas, liquid or solid. They aren't shiny (lustrous) and they don't conduct heat or electricity well. Usually their melting points are lower than for metals, although there are exceptions. The solids usually break easily, and can't bend like metals

Explanation:

In this question we have two dilutions occurring, for both cases we will use the dilution formula, which says that the initial concentration and volume of a solution must be equal to the final concentration and volume of the solution, we can better understand that formula presenting it to the question:

M1 * V1 = M2 * V2

where:

M1 = initial molar concentration

V1 = initial volume in liters

M2 = final molar concentration

V2 = final volume in liters

Now let's see what happens in our first dilution:

1.60 M * 0.075 L = M2 * 0.278 L

M2 = 0.43 M, this is the first final concentration

Now we have a solution with 0.43M and 278 mL

In the question we take 139 mL of the 0.43 M solution and add 193 mL, therefore having 332 mL as final volume, let's use the formula again

0.43 M * 0.139 L = M2 * 0.332 L

M2 = 0.180 M as final concentration

The final equation is obtained by reversing equation 2 and multiplying it by 1/2. Thus, option A and C are correct.

The given equations are:

\(\rm Ca\;+\;CO_2\;+\;1/2\;O_2\;\rightarrow\;CaCO_3\)

\(\rm 2\;Ca\;+\;O_2\;\rightarrow\;2\;CaO\)

The final equation to be obtained are:

\(\rm CaO\;+\;CO_2\;\rightarrow\;CaCO_3\)

The final reaction is obtained with the CaO as the product. The CaO as product is obtained by reversing equation 2.

The half of equation 2 will give the final equation.

Thus, the final equation is obtained by reversing equation 2 and multiplying it by 1/2. Thus, option A and C are correct.

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The movement of particles from an area of high concentration to an area of lower concentration is known as Diffusion. There are two types of Diffusion; simple diffusion and facilitated diffusion.

Simple diffusion and facilitated diffusion have some similarities and differences.

Both simple diffusion and facilitated diffusion are passive processes and do not require energy. They both deliver transport molecules in the direction of a concentration gradient.

There are also some differences. The speed of simple diffusion is low as compared to facilitated diffusion. Simple diffusion does not require the assistance of carrier molecules but facilitated diffusion does.

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Answer:

The stock solution

Explanation:

When preparing a series of solutions from a stock solution, the stock solution will always be the most concentrated solution of the set. Each of the subsequent solutions are prepared by dilution, which entails adding solvent to a portion of the stock solution. This will always result in a solution that is less concentrated than the stock solution.

Answer:

Insoluble substances remain the same when in water.

Explanation:

When a substance is regarded as insoluble, it means that the substance remains the same in water.

Soluble substances usually form one continuous phase with water when they are added to water (eg when salt is added to water).

However, when camphor is added to water, it does not form a single phase with water. It remains the same in the water and maintains a separate phase from the water. Hence camphor is an insoluble substance.

Answer:The amount of energy used or released as heat in a reaction.

Explanation:

Answer:

2 mole of Sodium hydroxide reacts with 1 mole of Sulfuric acid

Explanation:

Write down the equation in the beginning with reactants and products:

NaOH + H₂SO₄ → Na₂SO₄ + H₂0

Now try to balance it. Try with Na first:

2NaOH + H₂SO₄ → Na₂SO₄ + H₂0

Na atoms are balanced. There are 6 Oxygen atoms on the right and 5 on the left. Balance by increasing the H₂O moles:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂0

Check if H atoms are also balanced. They are. That means our final reaction is:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂0

2 Moles of NaOH reacts with 1 mole of H₂SO₄

The moles of sodium hydroxide required to neutralize 1 mole of sulfuric acid have been 2 mol.

The balanced chemical equation for the titration of sodium hydroxide against sulfuric acid has been:

\(\rm 2\;NaOH\;+\;H_2SO_4\;\rightarrow\;Na_2SO_4\;+\;2\;H_2O\)

From the balanced chemical equation, for the titration of 1 mole of sulfuric acid, 2 moles of sodium hydroxide has been required.

The moles of sodium hydroxide required for the titration of sulfuric acid has been:

\(\rm 1\;mol\;H_2SO_4=2\;mol\;NaOH\)

Thus, the neutralization of 1 mole of sulfuric acid has been required 2 mol of sodium hydroxide.

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Among the given options, the tests that are left-tailed are H0:μ≥18, Ha:μ<18, H0:μ≥11.3, Ha:μ<11.3, and H0:μ≥3.7, Ha:μ<3.7.

In these tests, the null hypothesis (H0) states that the population mean (μ) is greater than or equal to a specific value, while the alternative hypothesis (Ha) suggests that the population mean is less than that value.

A left-tailed test is used when the alternative hypothesis suggests that the population parameter is less than a certain value.

This indicates a left-tailed test, where the critical region is in the left tail of the distribution. These tests focus on detecting a significant decrease or difference in the population mean.

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Complete question :

Which of the hypothesis tests listed below is a left-tailed test? Select all correct answers.

Select all that apply: H0:μ≥18, Ha:μ<18 H0:μ≤19.3, Ha:μ>19.3 H0:μ=8, Ha:μ≠8 H0:μ≥11.3, Ha:μ<11.3 H0:μ≥3.7, Ha:μ<3.7

Answer: A change in color is not always a chemical change. If one were to change the color of a substance in a non-chemical reaction scenario, such as painting a car, the change is physical and not chemical.

Solid → Liquid: Melting

Solid → Gas: Sublimation

Liquid → Gas: Vaporization

Gas → Liquid: Condensation

Explanation:

A covalent compound is a compound with a metal and a nonmetal ion sharing valence electrons (option A).

A covalent compound is a molecule formed by covalent bonds, in which the atoms share one or more pairs of valence electrons.

Covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.

Chemical compounds are generally grouped into one of two categories as follows;

Covalent or molecular compounds generally result from two nonmetals reacting with each other. The elements form a compound by sharing electrons, resulting in an electrically neutral molecule.

Examples of covalent compounds are as follows:

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First, We need to examine the coefficients of the reactants and products then we will determine mole ratios.

Hi! To determine the mole ratios produced from the given equation,

4C₃H₆ + 6NO -> 4C₃H₃N + 6H₂O + N₂, you'll need to examine the coefficients of the reactants and products.

Your answer: There are three mole ratios produced in this equation:
1. 4 moles of C₃H₆ (propene) to 6 moles of NO (nitrogen monoxide)
2. 4 moles of C₃H₃N (acrylonitrile) to 6 moles of H₂O (water)
3. 6 moles of NO (nitrogen monoxide) to 1 mole of N₂ (nitrogen gas)

These mole ratios are useful for predicting the amounts of reactants and products in chemical reactions.

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Answer:

D. S (Sulphur)

Explanation:

you couldve just looked this up lol

the value of work done is -235.73 J. The negative sign indicates that the work done is against the external pressure.

The chemical reaction produces gas that pushes the piston upward against an external pressure of 1.5 atm so that the volume of the gas changes from 0.95 L to 2.5 L. The work (in joules) can be calculated as follows:

W = -PΔV

where,

W = work done

P = external pressure

ΔV = change in volume

We are given the following values:

P = 1.5 atm

ΔV = 2.5 L - 0.95 L = 1.55 L

Substituting the given values in the formula for work done,

W = -PΔV = -(1.5 atm) (1.55 L) = -2.325 atm L

Converting the units of pressure and volume to SI units,

W = -2.325 atm L × 101.3 J L⁻¹ atm⁻¹ × (1 m³ / 1000 L) = -235.73 J

Thus, the value of work done is -235.73 J. The negative sign indicates that the work done is against the external pressure.

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The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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The pKa is 4.76 and the pH of the buffer is 4.98. Hydrochloric acid are added to the buffer will occur the complete ionic equation for this reaction is: CH3COOH + HCl -> CH3COCl + H2O.

The pH of the buffer can be determined by calculating the concentration of the acetic acid and sodium acetate in the solution. Using the Henderson-Hasselbalch equation, the pH of the buffer can be determined by: pH =\(pKa + log (\frac{CH3COONa}{CH3COOH} )\). With the given information, the pKa is 4.76 and the pH of the buffer is 4.98.

When a few drops of hydrochloric acid are added to the buffer, a neutralization reaction will occur. The complete ionic equation for this reaction is: CH3COOH + HCl -> CH3COCl + H2O.

When a few drops of sodium hydroxide are added to the buffer, a neutralization reaction will occur. The complete ionic equation for this reaction is: CH3COOH + NaOH -> CH3COONa + H2O.

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Answer:

it is stored in the covalent bonds between the atoms

Explanation:

Upon moving down a group, the distance between the valence electrons and the nucleus increases.

As you move down a group in the periodic table, the number of electron shells (energy levels) increases. With each additional electron shell, the distance between the valence electrons (electrons in the outermost shell) and the nucleus also increases. This increased distance results in weaker attractive forces between the valence electrons and the nucleus.

As a result, the attraction between the valence electrons and the nucleus decreases, which leads to a decrease in the ionization energy and electron affinity of the elements in the group. This trend is a fundamental property of the periodic table and has significant implications for the chemical behavior of the elements.

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Answer:

It's c

Explanation:

Because I've checked

Answer:

3.7

Explanation:

Significant figures:

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.007 in this number only one significant figure present which is 7.

Zero between non zero digits are consider significant such as  1004 consist of four significant figures.

The zeros at the right side such as 4500 are also significant. There are four significant figures are present.

When we add or subtract the values the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.

When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.

Now we will calculate the difference between 7.69 and 4.0.

7.69 - 4.0 = 3.69

In given values 4.0 have less number of decimal places thus result must have only one decimal places. So we would round the result.

3.7

A carbon-hydrogen bond in ethane (CH3CH3) is best described essentially nonpolar. Option B is correct.

A nonpolar bond is one in which electrons are shared equally between atoms.In Ethane, the carbon atom has four valence electrons, while the hydrogen atom has one valence electron. The carbon atom forms four covalent bonds to the hydrogen atoms. Since the hydrogen atoms are equivalent, all of the carbon-hydrogen bonds are identical.

Each of the carbon-hydrogen bonds has a bond distance of 109.5°.Ethane is a hydrocarbon with the formula C2H6. It is an alkane with two carbon atoms. It's also known as a saturated hydrocarbon because all of its carbon atoms are bonded to as many hydrogen atoms as possible. Because of this, it contains only single bonds between atoms.Each carbon in ethane is surrounded by four other atoms and has a tetrahedral geometry.

Since the electronegativity of carbon and hydrogen atoms is quite close, the carbon-hydrogen bonds in ethane are nonpolar and symmetric. Because the electronegativity values of carbon and hydrogen are close, there is no significant polarity between the carbon-hydrogen bonds. Therefore, the carbon-hydrogen bond in ethane is best described as essentially nonpolar.

Therefore, Option B is correct.

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The total of calories is 304 and the total of sodium is 32 milligrams.

The serving size represents a portion of food that is nutritionally appropriate. Due to this, most food containers include more than one serving size, this means they are not intended to be consumed by one person in one sitting.

Understanding serving size is important because based on this you can determine the number of calories, the amount of sodium, sugar, vitamins, etc. all the container of food has.

In the case of the apple juice, the total of fluid is 16 ounces but the serving size is 8, which means there are 2 servings per bottle. Let's use this proportion to calculate the calories and sodium.

Note: This question is incomplete; here is the possible missing section:

What are the total calories and sodium in this apple juice?

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Answer:

Explanation:

m-mass of substance

s- specific heat capacity

dt- change in temperature.

So equating,  mgh=ms(dt),  we get  (dt)=gh/s.