(a) Is an endothermic reaction more likely to be spontaneous at higher temperatures or lower temperatures? Explain.

Answer:

For the wavelenth of light spectrum, I believe the order would be red visible light, infrared, microwaves and radio waves.

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Explanation:

Hydrogen sometimes is missing an electron and sometimes it has an extra electron.

Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.

Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. For scientists, it can be challenging to monitor them because of how quickly they spin. The tiniest particles in an atom, you can put 2000 of them into a proton, they are drawn to the positive charge of the protons.

Because it has no neutrons in its nucleus, hydrogen (particularly hydrogen -1) is unusual. There is only one proton in the nucleus of hydrogen. The only element without neutrons is this one. Although it has a single electron orbiting its nucleus as well, hydrogen typically contributes this electron to form a single, positively charged proton instead.

Thus, Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.

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Chlorophyta is another name for green algae.

Green algae is a large and diverse group of photosynthetic organisms that are typically green in color due to the presence of chlorophyll. They are found in a variety of habitats, including freshwater, saltwater, and moist terrestrial environments.

Chlorophyta is a phylum of green algae, which are photosynthetic eukaryotic organisms. They are commonly found in freshwater, but can also be found in marine and terrestrial habitats.

Chlorophyta are characterized by their green pigmentation due to the presence of chlorophyll a and b, as well as other accessory pigments.

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Answer:Chlorophyta

Explanation:

Answer:

For every force one object applies on another, there

is an equal force applied in the opposite direction.

Explanation:

please mark brainliest here

The very light weight of carbon tube makes it far more stronger than steel.

Aside the fact that carbon fibre has more strength than its respective steel, its durability is also an important property which makes it of better use. This implies that it can be used over a long period of time.

However, the great advantage it has over steel or any other metal is that it is very cheap to produce or manufacture.

Carbon is a chemical element found in the group 4 of the periodic table. It has atomic number of 6, valence electrons of 4, proton number of 6, neutron number of 6 and has 6 electrons.

In conclusion, carbon fibre is more stronger than steel in all characteristics including its safety.

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The value of Ksp for Hg2Br2 at 25∘C is 1.0 × 10^-12.

The given galvanic cell involves the reaction between Hg(l), Hg2Br2(s), Br−(0.10M), MnO4−(0.10M), Mn2+(0.10M), H+(0.10M), and Pt(s). The potential of the cell is given as 1.214 V at 25∘C.

To calculate the value of Ksp for Hg2Br2 at 25∘C, we can use the Nernst equation:

Ecell = E°cell - (0.0592/n) * log(Q)

Where Ecell is the cell potential, E°cell is the standard cell potential, n is the number of electrons transferred, and Q is the reaction quotient.

Since Hg2Br2 is a solid and its concentration does not appear in the reaction quotient, we can assume its activity is 1. Therefore, the reaction quotient simplifies to the concentrations of the other species involved in the cell:

Q = [Br−] / [MnO4−][Mn2+][H+]

By substituting the given concentrations and the calculated cell potential into the Nernst equation, we can solve for E°cell. Then, using the Nernst equation at equilibrium (Q = Ksp), we can solve for Ksp. In this case, the value of Ksp for Hg2Br2 at 25∘C is found to be 1.0 × 10^-12, rounded to one significant figure.

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Answer:

Difference in temperature.

Explanation:

Conduction is the movement of heat energy through a substance or from one substance to another by direct contact of atoms and molecules. Heat moves directly from one molecule to another. The heat energy speeds up the movement of the atoms and they collide with other molecules setting them into faster motion.

Answer:

See below ~

Explanation:

Basic oxides

Acidic oxides

Answer:

a. 4KCN

Explanation:

Four is a coefficient found in the chemical formula 4KCN.

KCN is potassium cyanides.

 A coefficient is a number that is written before a chemical compound. It is usually used to balanced reaction expression.

Chemically such numbers indicate the number of moles or volume of that specie.

Since KCN is the only compound with 4 before it, so, the solution is KCN

The pressure (in atm) inside the aerosol container obtained is 5.24 atm

101.325 KPa = 1 atm

The pressure inside the aerosol container in atm can be obtained as illustrated below:

101.325 KPa = 1 atm

Therefore,

531 KPa = 531 / 101.325

531 KPa = 5.24 atm

Thus, 531 KPa is equivalent to 5.24 atm

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When benzene has both a strong and weak activator group, only the strong activator guides the electrophile towards ortho or para to the that activator group.

Because they lack an electron, electrophiles can receive a pair of electrons from organisms that have an abundance of them. Examples include carbonyl compounds and carbocations. A nucleophile is a species that has an abundance of electrons and gives electron pairs to species that lack electrons. Carbanions, water, ammonia, cyanide ions, and others are examples.

A chemical species known as an electrophile in chemistry accepts an electron pair from nucleophiles to form bonds with them. Electrophiles are Lewis acids because they are electron-accepting molecules.

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Answer:

It has 53

Explanation:

hope this helps

Answer: 72

Explanation:

There are 72 neutrons that iodine have.

A car's speedometer shows instantaneous speed which is the speed the car is traveling at that instant.

Speed is a measure of the ratio of the distance moved by an object or body and the time taken.

Mathematically;

When objects are moving, the speed of the object may change

with time. Hence, speed can be measured at a given instant known as instantaneous speed.

Speed over the duration of a journey can also be measured and this is known as average speed.

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Complete question:

Does a car's speedometer show instantaneous speed,average speed, or velocity Explain?

Answer:

La respuesta correcta es: b. Calor sensible

Explanation:

Al absorber calor, un sistema puede: aumentar su temperatura o cambiar de fase (es decir, pasar de un estado de agregación a otro). Los cambios de fase se producen a temperatura constante, por lo que el calor involucrado se denomina calor latente. Por ejemplo, cuando el agua líquida pasa a vapor por calentamiento a la temperatura de ebullición, esta temperatura se mantiene constante hasta que toda la masa de agua pasa al estado vapor. En cambio, cuando el sistema absorbe calor cambiando su temperatura pero permaneciendo en el mismo estado de agregación (por ejemplo, cuando calentamos agua líquida por debajo de la temperatura de ebullición), el calor involucrado se denomina calor sensible.

The answer to this question can be determined using the Ideal Gas Law, which states that PV = nRT.  the maximum volume of the airbag in the simulation contains 16.6 moles of gas.

The Ideal Gas Law, also known as the Combined Gas Law, is an equation of state that describes the behavior of an ideal gas. It states that the pressure, volume, and temperature of an ideal gas are directly proportional, with the product of the pressure and volume remaining constant in a given mass of the ideal gas. In other words, when any one of these three properties is changed, the other two properties will change in an inverse manner, keeping the product constant. The equation of the ideal gas law is PV = nRT, where n is the number of moles of the ideal gas, P is its pressure, V is its volume, and T is its temperature.

Using the formula

PV= nRT

where P is pressure,

V is volume,

n is the number of moles,

R is the ideal gas constant, and

T is temperature.

Given the maximum volume of the airbag (66.2 L) and the temperature of the environment (20°C),

we can calculate the number of moles of gas contained in the airbag.

n = (P × 66.2 L) / (R ×20°C)

Using the atmospheric pressure at sea level (101,325 Pa), the calculation can be further simplified to:

n = (101,325 Pa ×66.2 L) / (8.314 J/(Kmol) × 293.15 K)

n = 16.6 mol

Therefore, the maximum volume of the airbag in the simulation contains 16.6 moles of gas.

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Answer:

1) 7.256 mol Br2 (Cl2)/(Br2)

The Br2 cancels out, so we have 7.256(2)

This is 14.512.

2) Number of moles = mass / molar mass

Number of moles = 239.7 g/ 35.5 g/mol

Number of moles =  6.8 mol

BrCl=13.6 mol

13.6(11.5.357)

1568.9 g

3) Repeat the same process with problem 2, given that there are 6.022x10^23 atoms in a mole.

Explanation:

Br2 + Cl2 → 2BrCl

A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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Answer:

the answer is c

Explanation:

because i got it right

The following is evidence that a chemical reaction or chemical change  has taken place in one of the processes that the color change that takes place after heat melts and begins to decompose the sugar.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

B 2:2

Explanation:

Mole ratio is the comparison of the ratio of two compounds or elements in a chemical reaction. In a balanced equation, the moles of a particular compound or element is written as a coefficient. This means that mole ratio is the ratio of the coefficient of two substances in a reaction.

In this balanced chemical equation given as follows:

2CO + 02 → 2CO2

The number of moles/coefficient of carbon monoxide (CO) is 2 while that of carbon dioxide (CO2) is 2.

Hence, the mole ratio of CO to CO2 is 2:2

Answer:

64.52 mg.

Explanation:

The following data were obtained from the question:

Half life (t½) = 1590 years

Initial amount (N₀) = 100 mg

Time (t) = 1000 years.

Final amount (N) =.?

Next, we shall determine the rate constant (K).

This is illustrated below:

Half life (t½) = 1590 years

Rate/decay constant (K) =?

K = 0.693 / t½

K = 0.693/1590

K = 4.36×10¯⁴ / year.

Finally, we shall determine the amount that will remain after 1000 years as follow:

Half life (t½) = 1590 years

Initial amount (N₀) = 100 mg

Time (t) = 1000 years.

Rate constant = 4.36×10¯⁴ / year.

Final amount (N) =.?

Log (N₀/N) = kt/2.3

Log (100/N) = 4.36×10¯⁴ × 1000/2.3

Log (100/N) = 0.436/2.3

Log (100/N) = 0.1896

Take the antilog

100/N = antilog (0.1896)

100/N = 1.55

Cross multiply

N x 1.55 = 100

Divide both side by 1.55

N = 100/1.55

N = 64.52 mg

Therefore, the amount that remained after 1000 years is 64.52 mg

Matter is composed of atoms .

Any area  that takes space and mass called as Matter. It is made up of  atom or other element made up of space and mass only, Atoms bond together to form molecule, compound and matter such as solid, liquid and gas.

Atom can not be broken as it is the smallest unit of a matter, made up of Electrons, protons, and neutrons and its size is about 100 picometers.

A matter is a complex of molecule which are made up of number of atoms by  chemical bonds, these bond can be covalent bond, ionic bond, metallic bonds, coordinate covalent bonds.

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The sum of oxidation and reduction reactions must be balanced; that is, the number of electrons lost in oxidation half-reaction should be equal to the number of electrons gained in the reduction half-reaction. To balance these equations, we can use the half-reaction method.

Ag+(aq) + Fe(s) → Fe2+(aq) + Ag(s)

Oxidation half reaction: Fe(s) → Fe2+(aq) + 2e-

Reduction half reaction: Ag+(aq) + e- → Ag(s)Fe(s) is oxidized and

Ag+(aq) is reduced2) Fe3+(aq) + I-(aq) → Fe2+(aq) + I2(g)

Oxidation half reaction: I-(aq) → ½I2(g) + e-

Reduction half reaction: Fe3+(aq) + e- → Fe2+(aq)I-(aq) is oxidized

and Fe3+(aq) is reduced3) Mg(s) + H+(aq) → Mg2+(aq) + H2(g)

Oxidation half reaction: Mg(s) → Mg2+(aq) + 2e-

Reduction half reaction: 2H+(aq) + 2e- → H2(g)Mg(s) is oxidized

and H+(aq) is reduced4) Cu2+(aq) + Zn(s) → Zn2+(aq) + Cu(s)

Oxidation half reaction: Zn(s) → Zn2+(aq) + 2e-

Reduction half reaction: Cu2+(aq) + 2e- → Cu(s)Zn(s) is oxidized

and Cu2+(aq) is reduced5) Al(s) + Fe2+(aq) → Al3+(aq) + Fe(s)

Oxidation half reaction: Fe2+(aq) → Fe(s) + 2e-

Reduction half reaction: Al(s) → Al3+(aq) + 3e-Fe2+(aq) is oxidized

and Al(s) is reduced.

Balancing Redox Equations using Half-Reaction Method is used for balancing redox equations. Here are the steps to follow: Write the unbalanced equation in the form of two half-reactions, one oxidation, and one reduction.
The sum of oxidation and reduction reactions must be balanced; that is, the number of electrons lost in oxidation half-reaction should be equal to the number of electrons gained in the reduction half-reaction. To balance these equations, we can use the half-reaction method. This method involves the following steps: writing the equation in the form of two half-reactions, balancing atoms in each half-reaction, balancing charges by adding electrons, multiplying half-reactions by the required coefficient, and adding half-reactions and cancelling out the electrons and spectator ions.

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: 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 muscles break down glycogen into glucose which undergoes glycolysis . the end product of glycolysis in active muscles is lactate, which is transported in the blood. the liver uses energy from fally acid oxidation drive glucose. the glucose produced in the liver is transported to muscle in the bloodstream.

muscles breaks into glycogen and glucose. the lactate is always the end product in glycolysis. by the fally acid oxidation liver uses energy. the cori cycle is the metabolic pathway which involves the active muscles and the  liver. so, the fatty acid will react and it forms the carbon dioxide and the water.

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Avogadro's law states that in one mole of a substance, there are \(6.022 \times 10^{23}\) molecules.

This means that in 1.55 moles, there are \(1.55(6.022 \times 10^{23})=\boxed{9.33 \times 10^{23} \text{( to 3 sf)}}\)

Particles are moving from regions of high concentration to low concentration. Hence, option A is correct.

Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration.

Diffusion results from the random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.

This process can neither be stopped nor reversed. It occurs when the medium surrounding the cell has a higher water concentration than the cell.

Hence, option A is correct.

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Answer: A. Particles are moving from regions of high concentration to low concentration.

Explanation:

Got it right, EDGU, 2023

The mole ratio of carbon to sulfur atoms is 0.5010 from the given data.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles that is atoms, molecules are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

Mole ratio of carbon to sulfur atoms is 0.657785/1.31275=0.5010

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Answer:

Explanation:

its 1:2 i have it in my notes from 2 years ago when i was in school

The reagents used in the preparation of 2-hexyne from acetylene are NaOH, MeI, NaOH, and CH3-CH2-I. The reactions involve deprotonation of the acetylene, substitution reactions with alkyl halides, and additional deprotonation to obtain the desired product.

To prepare 2-hexyne starting from acetylene, you would use the following reagents: NaOH, MeI, NaOH, and CH3-CH2-I.

Here is a step-by-step explanation:

1) Start with acetylene (ethyne), which has the molecular formula C2H2. Acetylene is a terminal alkyne, meaning it has a triple bond between the two carbon atoms.

2) To convert acetylene into 2-hexyne, the first step involves treating acetylene with NaOH (sodium hydroxide). NaOH is a strong base that can deprotonate the terminal alkyne, resulting in the formation of the corresponding sodium alkynide salt. The reaction can be represented as follows:

C2H2 + NaOH → NaC≡CNa + H2O

3) Next, the sodium alkynide salt is reacted with MeI (methyl iodide), an alkyl halide. This reaction is known as an alkyl halide substitution. The methyl group from MeI replaces one of the sodium atoms in the sodium alkynide salt, resulting in the formation of an alkyl-substituted alkynide. The reaction can be represented as follows:

NaC≡CNa + MeI → NaC≡CMe + NaI

4) The resulting alkynide, NaC≡CMe, is then treated with NaOH again. This step involves adding excess NaOH to the reaction mixture. NaOH reacts with NaC≡CMe, resulting in the formation of a terminal alkyne, 2-hexyne. The reaction can be represented as follows:

NaC≡CMe + NaOH → HC≡CCH2CH2CH2CH3 + NaI

5) Lastly, to obtain 2-hexyne, the terminal alkyne, HC≡CCH2CH2CH2CH3, is reacted with CH3-CH2-I (iodoethane). This reaction involves an alkyl halide substitution, where the iodoethane adds an ethyl group to the alkyne. The reaction can be represented as follows:

HC≡CCH2CH2CH2CH3 + CH3-CH2-I → HC≡CCH2CH2CH2CH2CH3 + I-CH3

In summary, the reagents used in the preparation of 2-hexyne from acetylene are NaOH, MeI, NaOH, and CH3-CH2-I. The reactions involve deprotonation of the acetylene, substitution reactions with alkyl halides, and additional deprotonation to obtain the desired product.

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