which statements are true about the representation of enthalpy for a thermochemical equation? select all that apply. a. on the product side, it is an exothermic reaction. b. on the reactant side, it is an exothermic reaction. c. on the product side, it is an endothermic reaction. d. on the reactant side, it is an endothermic reaction.

The number of protons, electrons, and neutrons are 55 p+ 55 e- 55 n. They are subatomic particles in the element. They can be calculated from the atomic number and the mass number.

Every element has a mass number and an atomic number. The number of protons, electrons, and neutrons can be calculated from the mass number and the atomic number.

If given

How many protons, electrons, and neutrons?

Number of protons

= atomic number

= 55

Number of electrons

= atomic number - ion

= 55 - 0

= 55

Number of neutron

= mass number - atomic number

= 110 - 55

= 55

Hence, the number of protons, electrons, and neutrons are 55 p+ 55 e- 55 n.

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The Average Atomic Mass of copper is 63.5521 amu.

The average atomic mass of an element is calculated by multiplying the masses of all of its isotopes by the element's natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).

Given:

One isotope is 62.9298 amu and occurs 69.09%

Other cu isotope is 64.9433 amu and occurs  30.91%

Let

\(^{63}C\) % of abundance = x

\(^{65}C\) % of abundance = (100-x),

We have, the formula of average mass

Average mass = \(\frac{M_1x_1+M_2x_2}{x_1+x_2}\)

Average mass= 62.9298 ×69.09+ 64.9433 × 30.91/100

                       = 4347.819882+2007.397403/100

                       = 6355.217285/100

Average mass= 63.55217285

Therefore, The average mass of copper is  63.5521 amu

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Option B is NOT an indicator that a chemical reaction has occurred when two colorless salt solutions are mixed together in a test tube.

When a chemical reaction occurs, there is usually a change in color, temperature, precipitate formation, or gas formation.

In option A, the warmth indicates an exothermic reaction has occurred.

In option C, the colorless solution may still indicate a reaction has occurred, as some reactions may not involve a color change.

In option D, the cloudiness indicates the formation of a precipitate, which is a solid that forms from a solution during a chemical reaction.

However, option B is not a typical indicator of a chemical reaction, and it may be caused by impurities or the presence of another substance.

Therefore, it cannot be used as a conclusive indicator of a chemical reaction occurring in the test tube.

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The correct option is B-2.  2 water molecules are produced in the reaction.

According to the given chemical reaction i.e.

2O2 + CH4 —> (x)H2O + CO2 we have to find the number of molecules of water so that all the elements in the reaction get balanced out.

Carbon atoms are equal on both sides so we have to equalize hydrogen atoms first. If we have 4 atoms of hydrogen on the left side it should be equal to the right side.

If we add two molecules of H20 the equation can be balanced.

After balancing we get,

2O2 + CH4 —> 2H2O + CO2

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Answer:

1.583 moles

Explanation:

Rounded Atomic Mass of Au = 197 grams

\(\frac{312}{197} =1.5837, 1.584\)

Answer:

-943J or 943J released

Explanation:

m=2.4 mol x 207.g/ mol=497.3g

c=.129 J/gC

T= T f-Ti=(22.5-37.2)=-14.7C

Q=?

Q=(49.3g)(.129 J/g C) (-14.7 C)

= -943 J or 943 J released

1. 0+15+30+45+60=150/5=30 s

0+10+16+22+27=75/5=15 cm^3

then, 15/30= 0.5 cm^3/s(average rate of rxn)

2. 0+15+30+45+60+75+90+105+120=540/9=60 s

0+10+16+22+27+31.50+36+39.5+42=224/9=24.89cm^3

then, 24.89/60=0.414cm^3/s (avrg rate of rxn)

3. overall rxn add all the time divide by 12 and the volume add them too and divide by 12. after take average volume divide by the average time to get the average rate of overall rxn

4. 16/30= 0.533cm^3/s

5. 39.5/105= 0.37cm^3/s

A reactor, acetic acid, salicylic acid, and the use of an acetic anhydride to complete the reaction are all used in the production of aspirin.

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The electrolysis of molten LiBr involves the oxidation of Li+ ions at the anode and the reduction of Br- ions at the cathode. The oxidation of Li+ ions at the anode produces oxygen gas (O2(g)), while the reduction of Br- ions at the cathode produces lithium metal (Li(l)).

Electrolysis is a process used to separate elements or compounds by using electric current. It works by passing an electric current through a liquid or solution containing ions, which causes the ions to break down into their component atoms or molecules. The process involves the transfer of electrons between the negative and positive electrodes in the solution, forming new compounds and releasing energy. Electrolysis is commonly used in industry for the production of certain chemicals, in the purification of metals, and in the treatment of wastewater. It can also be used to electroplate metals and to produce jewelry and other artistic items.

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Answer:

Each person has their own skill level. The smaller ramps are less risky and are for more beginner to amateur skaters. The larger ones are very risky but can be very nice if a person does tricks with it. They are geared for more experienced skaters. Different ramps allow for more people to hace fun skating without the risk of injury...

Answer:

Reduction:

2e- + 2k+ ➡️ 2k

2e- + pb2+ ➡️pb

2e- +2H+ ➡️H2(diatomic molecule)

Oxidation :

2cl- ➡️cl2 + 2e- (Cl is a diatomic molecule)

2O-2➡️ O2+4e- (also diatomic molecule)

2Br-➡️ Br2 + 2e- (Br is also a diatomic molecule)

I don't know if I answered ur question or not but I hope this would help

Answer:

gold has 79 protons

Explanation:

i looked it up lol

Answer:

V₂ = 1223.2 mL  

Explanation:

Given data:

Pressure of gas = 820.4 mmHg

Initial volume of gas = 900.0 mL

Initial temperature = 25.0°C (25+273=298K)

Final temperature = 132.0°C (132.0 +273 = 405 K)

Final volume = ?

Solution:

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 900.0 mL × 405 K / 298 k

V₂ = 364500 mL.K / 298 K

V₂ = 1223.2 mL  

Answer:

Common pollutants produced by engines that burn fossil fuels are carbon dioxide, nitrogen oxides, sulfur dioxide, volatile organic compounds (VOCs), and particulates. Stoves, incinerators, and open burning produce carbon monoxide and carbon dioxide, as well as particulates.

Explanation:

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Phenolphthalein is an indicator commonly used in acid-base titrations to determine the endpoint of the reaction. It is colorless in acidic solutions but turns pink or purple in basic solutions.

In the neutralization reaction between hydrochloric acid (HCl) and calcium hydroxide (Ca(OH)₂), the acid and base react to form water (H₂O) and calcium chloride (CaCl2). The balanced chemical equation for this reaction is: 2HCl(aq) + Ca(OH)₂(aq) → CaCl₂(aq) + 2H₂O(l)

Since calcium hydroxide is a strong base and hydrochloric acid is a strong acid, the reaction will be complete and the resulting solution will be neutral. Therefore, we expect to see the pink or purple color of phenolphthalein indicator when the student adds just enough calcium hydroxide to completely neutralize the acid and form a neutral solution.

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It represents an amine group.

Answer:

Coal, Oil and Natural Gas.

Explanation:

Coal: It is the primary fuel for the production of electricity and is responsible for about 40% of the electric power supply in the United States. The burning of coal and the mining process is harmful to the environment releasing air pollutants such as sulfur dioxide, nitrogen oxide, and mercury.

2. Oil: Oil is the primary source for the world's transportation. Most oil is pumped out of underground reservoirs but may also be found in shale and tar sands.  

3. Natural Gas: About 27% of U.S. energy is fueled by natural gas. It is commonly used to produce heat or electricity for buildings and industrial processes.

Answer:

a: milliliters and grams | b: heat | c: force | d: solid | e: attraction

Explanation:

A: milliliters are cubic and grams are weight.

b: heat make particles go faster

c: thus more collisions and temperature and force

d: solid, they can't move, just vibrate

e: attraction

The purpose of beta-oxidation in living organisms is the catabolism of fatty acids. The correct option is A.

The beta-oxidation of fatty acids refers to the process by which fatty acid molecules are broken down into acetyl-CoA molecules by the enzymes of beta-oxidation. The process begins at the beta carbon atom of the fatty acid, hence the name beta-oxidation.

The beta-oxidation of fatty acids occurs in the mitochondria and involves a series of four repetitive steps catalyzed by four separate enzymes.

Beta-oxidation involves even-number fatty acid molecules.

The product of beta-oxidation, acetyl-CoA can then be used by the citric acid cycle to produce reducing equivalents that enter the electron transport chain for the synthesis of ATP molecules.

Hence, the role of beta-oxidation in cells is to produce acetyl CoA for ATP synthesis.

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On changing the ratio of baking soda and vinegar changes the amount of carbon dioxide produced is true, because each species will depends on both reactants.

Chemical reaction between baking soda and vinegar is shown below in the attached image in which the formation of carbon dioxide, water and sodium acetate takes place. So the formation of carbon dioxide depends on the baking soda and baking soda reacts with vinegar to form sodium acetate so change in the ratio will changes the amount of carbon dioxide.

Hence on changing the ratio of reactants and vinegar changes the amount of carbon dioxide.

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Answer:

B - To increase the rate of the reaction

Explanation:

Catalysts speed up the reaction without being reactants or products, so aren't used up in the reaction.

The greatest  environmental cost of the hydroelectric power is the destruction of the free running rivers and their ecosystems.

The greatest environmental cost of the hydroelectric power is the blockage that is caused to the ricer system. The rivers are very important for the terrestrial ecology, as it provided the steady supply of the water and a habitat. The dam that creates the hydroelectric power but for this we must stop up a river that limits the access to the water downstream.

Thus, the destruction of the free running rivers and their ecosystems is the greatest environmental cost of the hydroelectric power.

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Answer:

+91.7 KJmol-1

Explanation:

Recall that ∆G= -RTlnK

Since ∆G in this case is ∆Grxn and K is the Ksp

Note that the Ksp is the solubility product (as shown by the reaction equation)

∆Grxn is the change in free energy for the reaction, in this case the ionization of the silver iodide into silver and iodide ions.

R= 8.314JK-1 and T =25°C +273 = 298 K (the centigrade temperature must be appropriately converted to its corresponding absolute absolute before proceeding with the calculation)

Hence we can substitute values accordingly;

∆Grxn = -(8.314 × 298 × ln 8.3×10^-17)

∆Grxn = +91.7 KJmol-1

Answer: Flue-gas desulfurization (FGD) material is a product of a process typically used for reducing SO2 emissions from the exhaust gas system of a coal-fired boiler.

Explanation:

HCl is used instead of plain deionized water in p-phenetidine in amide synthesis of acetophenetidin because HCl's polarity contributes to a reaction driven to the right, it is used for the acid-base reaction rather than water. It protonates the amine group, allowing it to dissolve easily.

An acid-base neutralization reaction is represented as a double-replacement reaction in this traditional representation. For example, the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH) solutions yields a solution of sodium chloride (NaCl) and a few extra water molecules.

When acid and base react, they produce salt and water. Water and salt are both neutral, which means that when acid and base react, they neutralize each other. As a result, it is known as a neutralization reaction.

Thus,  HCl's polarity contributes to a reaction driven to the right.

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