Vinegar (acetic acid) and baking soda (sodium bicarbonate) react in an endothermic reaction to produce sodium acetate, carbon dioxide, and water. Which statement justifies classifying the reaction as endothermic?

A. The reaction produces water.

B. The bonds in both the reactants and products are covalent bonds.

C. The reaction needs a catalyst.

D. The total potential energy of the products is less than the total potential energy of the reactants.

Answer:

becomes negatively charged

Explanation:

this is because when an object receives electrons it becomes negatively charged and the object that loses electrons becomes positively charged.

Answer:

First one because by adding more electrons it makes something more negative. So it becomes negatively charged

Answer:

Explanation:

The height of the wave is called the amplitude.

so the correct answer is B.

The required time it would take at a current of 3.5 amps to plate out 2.50 grams of gold is 1,049 seconds.

According to the faraday's second law, equation to calculate the time will be given below:

W = ZIt, where

W = deposit mass = 2.50 grams

Z = equivalent mass / 96500 = 65.6 / 96500 = 0.000679

I = current = 3.5 amp

t = required time = ?

On putting values in above equation, we get

t = (2.50) / (0.000679)(3.5)

t = 1,054 sec = 1,049 s (approx)

Hence required seconds to plate out 2.50 g of gold is 1,049 sec.

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Answer:

15

Explanation:

The Friedel–crafts alkylation provide a nice way of attaching an alkyl group to an aromatic compound.

The Friedel–crafts alkylation occurs when an alkyl group is added to an aromatic compound.

The reaction mechanism commences with the attack of an alkyl halide on an aromatic substrate using AlCl3 as a catalyst. This question is incomplete henece we can not draw the structure of the product. The alkyl portion of the alkyl halide is now attached to the aromatic compound at te end of the reaction.

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Answer:

hyposthesis

Explanation:

The mass of the glass is 1 gram.

What is specific heat capacity?

 This refers to the amount of heat in joules (J) absorbed per unit mass (kg) of the material when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

From the question:

cp= 0.20 cal/(g°C)

T = 150°C

heat added = 30 cal

To find the mass of the glass, you can use the formula:

mass = heat added / (specific heat capacity x temperature change)

Substituting the given values:

mass =           30 cal

              (0.20 cal/(g°C) x 150°C)

mass =             30

                 (0.20 x 150)

mass       = 30

                  30

mass = 1 g

Hence, the mass of the glass is 1 gram.

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Gold is a chemical element  which is produced by the collision of supernovas and stellar remnants.Processes like atomic fusion or fission only can produce gold.

It is a process by which two nuclei or sub -atomic particles collide to produce one or more nuclides. For reactions to be called nuclear it is necessary for it to transform at least one nuclide .

In nuclear reaction, total energy is conserved.The energy is released in in forms of kinetic energy, emission of high energy photons  and some products which are meta-stable.

There are 4 types  of nuclear reactions :

1) fission

2)fusion

3) nuclear decay

4) transmutation

Generally, in nuclear reactions,there is a heavy nucleus  and light bombarding particle which produces 2 new particles heavier nucleus and lighter ejected particle.

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Answer:

the food chain you mean

Explanation:

pollution than mosquitoes then alligators

Answer:

Matter cannot be created destroyed

Explanation

Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change—none is created or destroyed. This concept is called the Law of Conservation of Mass.

The element that is in a higher column will have a stronger coulombic attraction because this property is dependent on the size of the charge.

This is known as any substance which can't be broken down into smaller parts through a chemical means and examples include helium, magnesium etc.

On the periodic table, we have two broad divisions in which the rows are called period while the column is referred to as group. As we move up the column, the coulombic attraction increases.

This is so because a high number of protons will lead to a corresponding increase in the positive charge. This then improves the strength of the nucleus and it is able to pull the electrons further away from it thereby making it the most appropriate reason.

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The kinetic energy of molecules depends on absolute temperature. So here since all the temperature are equal, all the molecules will have same average kinetic energy. So option 4 is right.

Kinetic energy of a molecule of a gas depends on the movement of the molecule. It is governed by the kinetic gas equation. The kinetic energy and temperature is related by the equation

KE = \(\frac{3}{2}\) nRT

n is the number of moles

R is universal gas constant

T is the absolute temperature

KE is directly proportional to the temperature and increases and decreases with it. Here all gases exists at the same temperature. Pressure does not have any effect on the kinetic energy of gases.

So option 4 will be the correct answer.

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For this question we will be using two main formulas:

1. Finding the number of moles of the compound, since we have mass and the molar mass of NaC2H3O2 is 82.03g/mol

Molar mass = mass/number of moles

We already have molar mass and mass

82.03 = 12.2g/number of moles

n = 12.2/82.03

n = 0.15 moles of NaC2H3O2

2. Now we can find the volume in mL, by using the Molarity formula, which is:

Molarity (or concentration) = number of moles/volume in Liters

We already have the molarity and number of moles

0.210 M = 0.15 moles/V in L

V = 0.15/0.210

V = 0.714 L or 714 mL

Answer:

The war was triggered by a German policy designed to force the indigenous population to grow cotton for export and lasted from 1905 to 1907, during which 250,000–300,000 died. After the scramble for Africa among the major European powers in the 1880s, Germany reinforced its hold on several formal African colonies.

Explanation:

please give me brainlist and follow

only mutations that alter amino acid residues in the active sites of enzymes affect the function of the enzyme. False.

Mutations that alter amino acid residues in the active sites of enzymes can certainly affect the function of the enzyme, but mutations that occur in other regions of the enzyme can also have an impact on its function. Enzymes are large, complex molecules with a specific three-dimensional structure that is critical to their function. Changes in the amino acid sequence of an enzyme can affect its structure and, in turn, its function. Mutations in regions of the enzyme that are not part of the active site can affect the stability or conformation of the enzyme, which can impact its ability to bind substrates, catalyze reactions, or undergo allosteric regulation.

Additionally, mutations that alter amino acid residues in domains or regions of the enzyme that are involved in interactions with other proteins or cofactors can also affect the function of the enzyme. For example, mutations in regulatory domains of an enzyme can affect its ability to be activated or inhibited by other proteins or small molecules.

Therefore, while mutations in the active sites of enzymes can certainly affect their function, mutations in other regions of the enzyme can also have significant effects on their activity, specificity, and regulation.

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Answer:125ml - volume of phosphoic acid

Explanation:

The equation of the reaction is

H3PO4 + 3 NaOH ---> Na3PO4 + 3H2O

Such that I mole of H3PO4 reacts with 3 moles of  NaOH to produce the products above.

Given that

M1= Molarity of phosphoric acid = 7.48x10^-2 M

n1= number of moles of phosphoric acid = 1

V1=? ml

M2= Molarity  of Sodium hydroxide =0.244 M

V2= volume of sodium hydroxide= 115ml

n2=number of moles of sodium hydroxide = 3

Using the Dilution equation formulae,

M1V1/n1 = M2V2/n2

7.48X10-2 x V1 /1= 0.244M x 115ml/3

V1=0.244Mx115mlx1/0.0748M X 3

V1= 28.06/0.2244= 125.04ml

V1=125.04ml rounded up to 125ml

Atoms with vastly different electronegativity levels can form ionic bonds. Atoms with minor variances in electronegativity form covalent connections with one another.

Crystal cleavage and symmetry are two further features influenced by chemical bonding. In general, stronger chemical bonds lead to greater hardness, higher melting and boiling temperatures, and smaller coefficients of expansion. Stronger chemical bonds between atoms make them more difficult to separate.

The valence and bonding preferences of an atom's constituents can typically be used to predict a solid's qualities. Ionic, covalent, metallic, and molecular bonds are the four basic types of bonds covered here. ice and other solids with hydrogen bonds.

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The molarity of the NaOH solution is 1.77 M.

Molarity is defined as the number of moles of solute dissolved in one liter of solution. To calculate the molarity of the NaOH solution, we need to first determine the number of moles of NaOH present in the solution.

The formula to calculate the number of moles is:

moles = mass ÷ molar mass

where:

mass is the mass of the solute (in grams)

molar mass is the molar mass of the solute (in g/mol)

In this case, we are given the molarity and volume of the solution, but we need to first find the number of moles of NaOH.

To do this, we can rearrange the formula for molarity:

Molarity = moles ÷ volume

Rearranging the formula to solve for moles gives us:

moles = Molarity x volume

Substituting the given values gives us:

moles = 2.3 mol/L x 1.3 L

moles = 2.99 mol

Therefore, the solution contains 2.99 moles of NaOH.

Finally, we can calculate the molarity of the solution by dividing the number of moles by the volume of the solution in liters:

Molarity = moles ÷ volume

Molarity = 2.99 mol ÷ 1.3 L

Molarity = 1.77 M

The molarity of the NaOH solution is 1.77 M.

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Answer:

The answer is SiO2

Explanation:

Because nonmetals are those who gain electrons and form ve ions

Answer:

Wind depositing sand to build up sand dunes.

Explanation:

The metal cationic (+) atom to nonmetal anionic (-) atom ratio in the compound formed between Potassium and Chlorine is 1:1.

A compound is made up of two or more atoms that are chemically combined together. In this case, we have the atoms; Potassium and Chlorine.

The electronic configuration of the atoms is not shown here but the metal cationic (+) atom to nonmetal anionic (-) atom ratio in the compound formed between Potassium and Chlorine is 1:1.

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The only incorrect statement in the diagram is (d) Cr202-7 can be used in aqueous H2SO4.

Option (d) is incorrect because the half-cell reaction involving Cr2O7^2- and H+ (aq) produces H2CrO4, which can decompose in acidic solutions, leading to inaccurate results. Therefore, Cr2O7^2- should not be used in aqueous H2SO4 for the quantitative estimation of Fe(NO3)2-.

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The Only incorrect statement is option C

Electrochemistry is a branch of chemistry that deals with the study of the relationship between electrical energy and chemical reactions.

It involves the study of the behavior of electrons and ions in chemical reactions that occur in a solution or at the interface between two different phases, such as a solid electrode and a liquid electrolyte.

We can see that it is better to use HCl instead of the use of the H2SO4 acid as we have in the options.

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The alpha- ketoglutarate is the  5-carbon intermediate of the citric acid cycle which converted to a 4-carbon molecule with the release of carbon dioxide

The first decarboxylation reaction in Krebs cycle ( known as  citric acid cycle ) is catalyzed by isocitrate dehydrogenase in which one six carbon atoms compound isocitrate is decarboxylated to yield five carbon atom containing alpha ketoglutaric acid.

The alpha- ketoglutarate is the  5-carbon intermediate of the citric acid cycle which is salt of alpha ketoglutaric acid. The last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle.

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Answer:

Nucleus: Choice C

Electron: Choice E

Proton: Choice A

Neutron: Choice B

Energy Level: Choice D

Explanation:

1. Nucleus contains the protons and neutrons.

2. Electrons surround the nucleus and have a negative charge.

3. Protons are positively charged and found in the nucleus.

4. Neutrons have a neutral charge and are found in the nucleus.

5. The energy level refers to the electron orbital.

Yes, the statement is True i.e. Sodium chloride is a buffer creating an injectable solution that is isotonic.

A buffer solution, also referred to as a pH buffer or hydrogen ion buffer, is an aqueous mixture of a weak acid and its conjugate base, or vice versa. The pH scarcely changes at all when a small amount of a strong acid or basic is added to it. Buffer solutions are used in a wide range of chemical processes to keep pH values almost constant. Buffering is used by many living systems to regulate pH in the natural world. For instance, the bicarbonate buffering system regulates the pH of blood, and bicarbonate also acts as a buffer in the ocean. Because of a chemical equilibrium between the weak acid HA and its conjugate base A, buffer solutions are resistant to pH change: HA ⇌ H+ + A− According to Le Chatelier's principle, an equilibrium between a weak acid and its conjugate base shifts to the left when hydrogen ions (H+) are supplied. Because of this, despite the supply of strong acid, the concentration of hydrogen ions increases less than anticipated.

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Answer:

2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define RxN

Mg (s) + CO₂ (g) → MgO (s) + C (s)

Step 2: Balance RxN

2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)

Answer:

The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium, magnesium, calcium, strontium, barium, and radium.

Hope this helped!

According to  the given statement 52.8 years long until we run out.

The correct option is A.

A blend of hydrocarbon-rich gases makes up natural gas. Methane, nitrogen, carbon dioxide, and other gases are all naturally occurring in the environment. Deep inside the earth, amid other beds of solid and liquid hydrocarbons like coal and crude oil, lie natural gas reserves.

Renewable natural gas, which is created from decomposing organic materials, must also be compressed or liquefied in order to be used as a transportation fuel. Methane makes up the majority of the odorless, gaseous combination of hydrocarbons known as natural gas (CH4).

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The complete question is -

If there are 6,500 tcf of reserves of natural gas in the world and we are consuming 123 tcf per year, how long until we run out?.

A-52.8 years

B-77 years

C-90 years

D-105 years