Consider the reaction pathway graph below.
Which statement best describes this graph?
This is an exothermic reaction with a positive ΔHrxn.
This is an exothermic reaction with a negative ΔHrxn.
This is an endothermic reaction with a positive ΔHrxn.
This is an endothermic reaction with a negative ΔHrxn.

Acetic acid has a 4.76 pH value. In order to create a buffer with a pH of 5.20, it is necessary to have a ratio of 2.75 of acetic acid and acetate ions.

The amount of a substance's solute in a specific amount of solution is how concentrated it is. Molarity, or the number of moles of solute in one liter of solution, is a common unit of measurement for concentrations.

Since the Great Salt Lake has a high concentration of salt, there aren't many fish there. A high concentration of a material in a solution simply implies that there is a lot of it there in relation to the volume. It signifies you pay attention properly to state that you have high focus skills.

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The enthalpy change (ΔH) for the reaction CaC(s) + H2O(I) → Ca(OH)(ag) + CH4(g) is -3617.6 kJ.

To calculate ΔH for the reaction CaC(s) + H2O(l) → Ca(OH)2(ag) + CH4(g), we can use Hess's law, which states that the enthalpy change of a reaction is independent of the pathway taken and depends only on the initial and final states.

We can manipulate the given reactions to obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X (unknown value)

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's manipulate these equations to cancel out the common reactants and products and obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's sum up the equations to obtain the desired reaction:(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) 2Ca(s) + O2(g) → 2CaO(s) ΔH = -1271 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

By adding equations (ii), (iii), (iv), and (v), we can cancel out CaO(s), H2O(l), and O2(g):

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -1271 -653.1 -1300.0 -393.5

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -3617.6 kJ

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Answer:

The estimate is \(N = 1936 \)

Explanation:

From the question we are told that

The molecular weight of the protein is \(MW_p = 213 kD = 213 *10^{3} \ D\)

Generally the average molecular weight of amino acid is \(MW_a = 110 \ D\)

Generally the number of amino acids in the protein is mathematically represented as

\(N = \frac{MW_p}{MW_a}\)

         \(N  = \frac}{213 *10^{3}{110}\)

=> \(N = 1936 \)

Due to the temperature of the stars the stellar spectrum of Betelgeuse different than the spectra of the other stars in the constellation Orion.

Constellation Orion is defined as a prominent constellation of the orion which has been located on the equator of celestial and it can be visible throughout the whole world. It is the most identified constellations in the sky at night.

Constellation Orion  is the most identified constellations in the sky at night. Constellation Orion is defined as a prominent constellation of the orion which has been located on the equator of celestial and it can be visible throughout the whole world.

Therefore, Due to the temperature of the stars the stellar spectrum of Betelgeuse different than the spectra of the other stars in the constellation Orion.

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Answer:

The correct answer is "inferior".

Explanation:

In anatomy, the term inferior is used to describe parts of the body that are below other part used as reference. Inferior comes from the Latin "inferus" that means "below". In this case, the mouth will always be inferior to the nose, it doesn't matter if the boy was standing on his head or if he is in other position.

Answer:

correct answer, inferior.

Explanation:

of little or less importance, value, or merit always felt inferior to his older brother. 2a : of low or lower degree or rank. b : of poor quality : mediocre. 3 : situated lower down : lower.

If one person is regarded as inferior to another, they are regarded as less important because they have less status or ability. He preferred the company of those who were intellectually inferior to himself.

Hope this helped!

The electric current is  0.025 A

Electric current refers back to the go with the flow of energy in an electronic circuit and to the amount of strength flowing through a circuit. it's far measured in amperes (A). the bigger the cost in amperes, the more energy is flowing within the circuit.

Ag+ + e¯ →Ag

1F deposits 107.87 g/mol (molecular mass) of silver

1F = 96500 C

Let, 107.87 g/mol needed = 96500 C

Number of coulombs required to deposit 0.3650 g of silver =(96500/107.87) 0.3650  

Q = 326.5 C

According to Faraday’s law, Q = I x t

I = 326.5 C / (216 x 60 s) = 0.025 A

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Answer:

B. are openings in the earth surface

Answer:

density = mass / volume

mass of iron = 9.3g

volume of iron = 29.78ml - 28.00ml = 1.78 ml

density of iron = 9.3 / 1.78 = 5.22471910112 = 5.0

Explanation:

In order to find the percent yield of a reaction, we need to use the following formula:

%yield = (actual yield/theoretical yield)*100

The actual yield is 7.59 grams

The theoretical yield is the mass you found on letter C, 8.0 grams

Now we can use the formula:

%yield = (7.59/8)100

%yield = 0.9487 * 100

The percent yield will be 94.87 %

Answer:

its D

Explanation:

I took the test its right

The data can lead us to conclude that an alcohol thermometer can measure the freezing point of a liquid that freezes at −80 °C..

The liquid in glass thermometers are those thermometers whose thermometric substance is a liquid. Usually the best liquids to be used are those that have a long liquid range.

The data can lead us to conclude that an alcohol thermometer can measure the freezing point of a liquid that freezes at −80 °C..

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In scientific measurements, errors can be classified into two main types: systematic errors and random errors.  systematic errors can be corrected, random errors can only be reduced by improving the measurement.

In scientific measurements, errors can be classified into two main types: systematic errors and random errors. Systematic errors are those errors that have a consistent pattern and are introduced by flaws in the measurement process or equipment. An example of a systematic error is an incorrectly calibrated instrument, which gives readings that are consistently low for a set of experiments. Another example is a balance that consistently reads 0.050 g higher than a set of calibration standards. On the other hand, random errors are those that are caused by unpredictable fluctuations in the measurement process and have no consistent pattern. An example of a random error is the measurement of the percent transmittance of the same solution, which was measured to be 44.6%, 44.3%, 44.8%, and 44.3%. A student weighing a single sample of salt 5 times on the same balance and recording 5 measurements that are all different, but within 0.006 g of the initial value, also demonstrates a random error.

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At a rate of 2.0 moles per minute, oxygen gas would diffuse if helium effusion did so at a rate of 4.0 moles per minute through a porous barrier.

The associated process, called effusion, is the escape of gaseous molecules into an evacuated environment through a tiny (often minute) opening, such as a hole in a balloon. Helium effuses a great deal faster than ethylene oxide (M = 44.0 g/mol).

Graham's law of effusion describes this relationship as follows:

Rate of effusion = (rate constant) x (1/√molar mass)

Rate of diffusion of oxygen / 4.0

= √(4.00/32.00)

Solving for the rate of diffusion of oxygen, we get:

Rate of diffusion of oxygen

= 4.0 x √(4.00/32.00)

= 4.0 x 0.5

= 2.0 moles per minute

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Answer:

The answer to this question is given below in this explanation section.

Explanation:

                       "mutation can contribute to the development of many types of cancers"

About genetic mutations:

There are the two basic type of genetic mutations

Acquired mutations:

These are the most common cause of cancer.They occur from damage to genes in a particular cell during a personal life.For example this could be a breast cell or a colon cell,  with the goes on to divide many times and form a tumor.A tumor is an abnormal mass. Cancer that occurs because of acquired mutations are not found in every cell in the body and they are not passed from parent to child.

Factors that causes these mutations include:

Germ line mutations:  

These are less common.A germ line mutations occurs in a sperm cell or egg cell.It passes directly from a parent to a child at the time of conception.As they embryo grows into a baby,the mutation from the initial sperm or egg cell is copied into every cell within the body.Because the mutation effects reproductive cells,it can pass generation to generation.Cancer caused by germ line mutations is called inherited cancer. it accounts for about 5% to 20% of all cancers.

Mutations and cancer:

A mutation may be harmful beneficial or neutral.This depends where in the gene the change occurs.Typically the body corrects most mutations.A single mutations will likely not cause cancer.

Types of genes like a cancer:

Many of the genes that contribute to cancer development fall into board categories.

Tumors suppressor genes:

These are protective genes. Normally they limit cell growth by:

Answer:

see the photo

Explanation:

it was the answer

Answer:

It's evidence of a likely mass extinction.

Within an ecosystem, the sudden  disappearance of a type of fossil record is evidence of mass extinction.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds.

Explanation:

The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.

Answer:

boron aluminum gallium indium

Explanation:

hope this helps you

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.

The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

Converting between molecules and moles is done by either multiplying by or dividing by Avogadro's number.  To go from molecules to moles, divide the number of molecules by 6.02 x 10²³.

Avogadro's number, which is equal to 6.022 × 10²³, is the number of units in one mole of any material (defined as its molecular weight in grams). Depending on the substance and the nature of the reaction, the units could be electrons, atoms, ions, or molecules.

Thus,

No. of molecules = No. of moles × Avogadro no.

from the question we know,

No. of molecules = 2.44 × 10 ²⁴

Avogadro no. = 6.02 × 10²³

i.e. 2.44 × 10²⁴ = No. of moles  × 6.02 × 10²³

No. of moles = 2.44 × 10 ²⁴

                         6.02 × 10²³

No. of moles = 4.05

The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

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Answer:

H2SO4(aq)

Explanation:

The balanced equation for the reaction is given below:

H2SO4(aq) + Mg(s) —> MgSO4(aq) + H2 (g)

An acid is a substance which dissolves in water to produce hydrogen ion, H+ as the only positive ion.

To know which of the substance is acid, let us dissolve them in water to see which will produce hydrogen ion, H+ as the only positive ion.

This is illustrated below:

H2SO4(aq) —> 2H+(aq) + SO4^2-(aq)

Mg(s) + 2H2O(l) —> Mg(OH)2(aq) + H2(g)

MgSO4(aq) —> Mg^2+(aq) + SO4^2-(aq)

H2 is insoluble in water.

From the above, only H2SO4 produces hydrogen ion H+ on dissolution in water. Therefore, H2SO4 is an acid

Answer:

D on edg 2021

Explanation:

The atom or molecule that contributes electrons—in this case, magnesium is known as the reducing agent because the reduction of another molecule is made possible by the electrons it donates.

a molecule that, during a redox reaction, takes or absorbs electrons from another molecule. In a redox reaction, an electron acceptor reduces itself and acts as an oxidizing agent. Oxygen, nitrate, iron (III), manganese (IV), sulfate, carbon dioxide, and other elements are examples of acceptors.

A chemical species that "donates" an electron to an electron recipient is referred to as a reducing agent in chemistry. This chemical species is also referred to as a reductant, reducer, or electron donor (called the oxidizing agent, oxidant, oxidizer, or electron acceptor).

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The number of moles of chlorine that are produced if 35.4 grams of aluminum chloride react is 0.37 moles.

The mass in grams of carbon tetrachloride that will be produced from 52.5 grams of Cl₂ is 28.47 grams.

The number of moles of oxygen that are produced if 22.8 grams of potassium chlorate decompose is

The number of moles of chlorine that are produced is calculated as follows:

Equation of reaction:  2 AlCl₃ + 3 F₂ --> 2 AlF₃ + 3 Cl₂

The molar mass of AlCl₃ = 143.5 g/mol

Moles of AlCl₃ that reacted = 35.4/143.5 moles

Moles of Cl₂ produced = 35.4/143.5 * 3/2

Moles of Cl₂ produced = 0.37 moles

The mass in grams of carbon tetrachloride produced will be:

Molar mass of Cl₂ = 71.0 g/mol

Molar mass of carbon tetrachloride = 154 g/mol

Moles of Cl₂ = 52.5/71 moles

Mass of carbon tetrachloride produced = 52.5/71 * 1/4 * 154

Mass of carbon tetrachloride produced = 28.47 grams

The number of moles of oxygen that are produced will be:

Equation of the reaction: 2 KClO₃ ---> 2 KCl + 3 O₂

The molar mass of KClO₃ = 122.5 g/mol

Moles of KClO₃ reacted = 22.8/122.5 moles

Moles of oxygen produced = 22.8/122.5 * 3/2

Moles of oxygen produced = 0.279 moles.

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Answer:

a manometer

Explanation:

A manometer can be used to measure the pressure of a gas. The (difference in) height between the liquid levels (h) is a measure of the pressure. Mercury is usually used because of its large density.

Answer:

Explanation:

d =

m

V

m = d×V

V =

m

d

DENSITY

Density is defined as mass per unit volume.

d =

m

V

Example:

A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?

Step 1: Calculate the volume

V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³

Step 2: Calculate the density

d =

m

V

=

433

g

200

c

m

³

= 2.16 g/cm³

MASS

d =

m

V

We can rearrange this to get the expression for the mass.

m = d×V

Example:

If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass?

m = d×V = 500 mL ×

1.11

g

1

m

L

= 555 g

VOLUME

d =

m

V

We can rearrange this to get the expression for the volume.

V =

m

d

Example:

What is the volume of a bar of gold that has a mass of 14.83 kg. The density of gold is 19.32 g/cm³.

Step 1: Convert kilograms to grams.

14.83 kg ×

1000

g

1

k

g

= 14 830 g

Step 2: Calculate the volume.

V =

m

d

= 14 830 g ×

1

c

m

³

19.32

g

= 767.6 cm³

The mass of rock is 10 g.

We have sample of rock.

We have to determine its mass.

The density and mass of body are related as follows -

D = M / V

where -

V -  volume of the body.

M - mass of the body.

D - density of the body.

According to the question →

Using the formula discussed above -

D = M / V

M = D x V

M = 2.5 x 4 = 10 g

Hence, the mass of rock is 10 g

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Answer:

Celcius

Farenheit

Kelvin

Explanation:

Answer:a

Explanation:

Answer:

Answervis A.

Explanation:

Because,so that other scientists can validate the results.

I hope it's helpful!

Answer:Electrical Conductivity,soluble

Explanation:

Salt is a non-magnetic solid and is soluble in water. Sand is a non-magnetic solid and is insoluble in water.

Electrical Conductivity: Salt is an electrolyte and conducts electricity when dissolved in water or in a molten state. This is because salt dissociates into ions (Na+ and Cl-) that can carry electric current. In contrast, sand is a covalent compound and does not conduct electricity, as it does not dissociate into ions in the same way as salt. Sand is considered an insulator in terms of electrical conductivity.

Answer:

This is not a viable question.

Explanation: