A peptide bond is formed between two amino acids by the reaction of the ______ of one amino acid with the ______ of the other.

The given statement "the physical state of a reactant or product will affect the enthalpy of reaction in a thermochemical equation," is false.

The heat of reaction is influenced by the physical state of the reactants and products.

The term "thermochemical equation" refers to a balanced chemical equation that not only specifies the quantities of the various reactants and products but also the quantity of heat generated or absorbed.

A thermochemical equation may be written using fractional coefficients.

H2 ( g ) + ½ O2 ( g ) ⇒H2O ( l ) +285.8 KJ mol-1

H2 ( g ) + ½ O2 ( g ) ⇒ H2O ( l )  ΔH = – 285.8 KJ mol-1

When 1 mole of hydrogen and 0.5 mole of oxygen react, 285.8 KJ mol-1 of heat is produced. The heat generated will also double if the reactant amounts are doubled.

2H2 ( g ) + O2 ( g ) → 2 H2O ( l ) + 571.6 KJ mol-1

2H2 ( g ) + O2 ( g ) → 2H2O ( l ) ,ΔH = – 571.6 KJ mol-1

The heat of reaction, enthalpy of reaction, or enthalpy change of reaction is the quantity of heat that is evolved or absorbed in a chemical reaction once the number of moles of reactants as represented by the chemical equation have completely reacted.

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Answer:

10.4664 grams of CO

Explanation:

Remark

There's a couple of things you must look out for in this question.

1. The use of the term atoms. There are 2 atoms in each mol of CO

2. You need to divide by 2 to find the number of molecules which will lead to moles.

Step one

Divide the number of atoms by 2

4.50 e^23 / 2 atoms = 2.25 * 10^23 molecules.

Step Two

Find the number of moles of CO

1 mol of anything is 6.02 * 10^23 molecules in this case

x  = 2.25 * 10^23 molecules

1/x = 6.02 * 10^23/2.25 * 10 ^23            Cross multiply

1 * 2.25 * 10^23 = 6.02*10^23 * x           Divide by 6.02 * 10^23

2.25 * 10 ^ 23 / 6.02 * 10^23 = x

x = .3738 moles of CO

Step Three

Find the gram molecular mass of CO

C = 12

O = 16

1 mole = 12 + 16  = 28 grams.

Step Four

Find the number of gram in 0.3738 mols

1 mol = 28 grams

0.3738 mol = x                Cross multiply

x = 28 * 0.3738

x = 10.4664 grams

Answer:

melting point and conductivity

Explanation:

as long as both samples are copper, it will melt at the same time, aswell as conduct electricity the same.

Answer:

The answer is

H. Met, Val, Lys, Arg, Gin, Ser

Explanation:

Answer:

it looks smaller for sure ^_^

Answer:

2.4

Explanation:

3.2-0.8=2.4

is thi right i usefull

Answer:

either first or second if not them try d but I'm pretty sure a also I'm sorry if I getbyou this wrong I dearly apologize

Answer:

100g gold ring - 58g gold.

Explanation:

Assuming that the 100% represents the 100g of the gold ring, with a mathematical rule of three we can calculate the 58% of gold:

So, in 100g of the gold ring, there are 58g of gold.

1) First, let's calculate the molar mass of NaCl and CoCl₂:

Atomic mass of:

Na - 22.99 g/mol

Cl - 35.45 g/mol

Co - 58.93 g/mol

So for NaCl:

22.99 + 35.45 = 58.44 g/mol

Molar mass of NaCl = 58.44 g/mol

For CoCl₂:

58.93 + (2x35.45) = 129.83 g/mol

Molar mass of CoCl₂: 129.83 g/mol

2) Now let's find out the number of moles of each sample. For this, we use the following equation:

moles = mass / molar mass

NaCl:

mole = 116.8 / 58.44

mole = 1.999 moles of NaCl

CoCl₂:

mole = 259.7 / 129.83

mole = 2.000 moles of CoCl₂

3) To find the amount of particles, we use the Avogadro's constant. Avogadro's constant is a constant of proportion between the amount of matter and the number of entities that are linked to that amount. These entities can be atoms, molecules, ions, electrons, protons, neutrons.

In this case, we have the same number of moles, so we will have the same number of particles for both NaCl and CoCl₂.

The final concentration of NH₃ is greater than the initial concentration due to Le Chatelier's principle, which states that when a system at equilibrium is subjected to a change in concentration, pressure, or temperature, the system will adjust to counteract the change and restore equilibrium.

In the context of the Haber process, where nitrogen (N₂) and hydrogen (H₂) react to form ammonia (NH₃), the reaction can be represented as:
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
When the initial concentration of NH₃ is increased, according to Le Chatelier's principle, the system will try to counteract the change by shifting the equilibrium position to reduce the concentration of NH₃. This can be achieved by favoring the reverse reaction, in which NH₃ is consumed, and N₂ and H₂ are produced.
On the other hand, if the initial concentration of NH₃ is decreased, the system will attempt to increase the concentration of NH₃ to restore equilibrium. It does this by shifting the equilibrium position in the direction of the forward reaction, in which N₂ and H₂ react to form NH₃. This results in a higher final concentration of NH₃ than the initial concentration, as the system adjusts to counteract the change and restore equilibrium.

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The influence of a cerium additive on ultrafine diesel particle emissions and kinetics of oxidation can be significant. Cerium additives, such as cerium oxide (CeO2), are often used in diesel fuel as combustion catalysts to improve fuel efficiency and reduce emissions.

When cerium additives are introduced into diesel fuel, they can enhance the oxidation process of diesel particles. The cerium particles act as catalysts, promoting the conversion of hydrocarbons and carbon monoxide into less harmful gases like carbon dioxide. This helps to reduce the emissions of ultrafine particles, which are known to have adverse health effects.

The addition of cerium can also influence the kinetics of oxidation. It can lower the activation energy required for the oxidation reaction to occur, thereby increasing the rate of oxidation. This means that the diesel particles can be oxidized more quickly, leading to a reduction in particle emissions.

Furthermore, cerium additives have been found to have regenerative properties. They can form a protective layer on the surface of diesel particles, preventing the aggregation and growth of particles. This can help to maintain the small size of ultrafine particles, which are less harmful to human health compared to larger particles.

In conclusion, the addition of a cerium additive to diesel fuel can have a positive impact on ultrafine diesel particle emissions and the kinetics of oxidation. It can enhance the oxidation process, reduce particle emissions, and prevent particle growth. However, it is important to note that the specific effects may vary depending on the concentration of the additive, engine conditions, and other factors.

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The involved work done when gas  increases its volume from 1 to 3 while the pressure also increases from 250 to 1000 is 2250 joule

Work done= ΔpΔv

Work done=3×750

Work done=2250 joule

First Law of Thermodynamics: The change in total internal energy of a particular system between two states is described by the first law of thermodynamics. The first law of thermodynamics states that when heat is added to a system or when work is done, the total internal energy of the system will change. A positive result when calculating work done indicates that energy is discharged into the environment while the system is operating. If the value is negative, the environment's influence has caused the system to gain energy.

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The time it will take for 99.9049% of the released Sr-90 to disappear is approximately  96.93 years.

To calculate this, we can use the concept of half-life. The half-life of Sr-90 is given as 29.1 years. The percentage of Sr-90 that remains after a certain number of half-lives can be calculated using the formula:

Remaining percentage = (1/2)^(number of half-lives)

To determine the time it will take for 99.9049% of the Sr-90 to disappear, we can use the concept of half-life.

Given:

Half-life of Sr-90 (t₁/₂) = 29.1 years

Remaining percentage (R) = 0.099049 (99.9049%)

We can use the formula:

time = (number of half-lives) * (half-life of Sr-90)

To calculate the number of half-lives, we can use the equation:

R = (1/2)^(number of half-lives)

Taking the logarithm of both sides:

log(R) = (number of half-lives) * log(1/2)

Substituting the values:

log(0.099049) = (number of half-lives) * log(1/2)

Solving for the number of half-lives:

(number of half-lives) = log(0.099049) / log(1/2)

Now we can calculate the time:

time = (number of half-lives) * (half-life of Sr-90)

Substituting the given values:

time = (log(0.099049) / log(1/2)) * 29.1

To simplify the expression, let's evaluate the logarithms and perform the calculations:

log(0.099049) ≈ -1.003

log(1/2) ≈ -0.301

Using these values, we can simplify the expression:

time ≈ (-1.003 / -0.301) * 29.1

Simplifying further:

time ≈ 3.33 * 29.1

Calculating the product:

time ≈ 96.93

Therefore, it will take approximately 96.93 years for 99.9049% of the Sr released in a nuclear reactor accident to disappear.

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The average 70-kg human male consumes 0.57 moles.

We will use ideal gas equation to find the number of moles. It is as follows.

PV = nRT, where P is pressure, V is volume, R is gas constant, T is temperature and n is number of moles.

R = 8.3 Pa m³/K/mol

P = 100 kPa which will be 10⁵ Pa

V = 14 litre or 0.014 m³

T = 273 + 25

T = 298 K

Keep the values in formula to find number of moles

n = (10⁵ × 0.014)/(8.3 × 298)

Performing multiplication in numerator and denominator on Right Hand Side of the equation

n = 1400/2473.4

Performing division on Right Hand Side of the equation

n = 0.57 moles

Thus, 0.57 moles are being consumed.

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The autotrophs that have silica incorporated into their cell walls are diatoms. Option(D)

Diatoms are a type of microalgae found in both freshwater and marine environments. They have a unique external skeleton called a frustule, which is composed of silica.

The frustule provides structural support and protection to the diatom cell. Coccolithophorids, dinoflagellates, and radiolarians are other types of marine microorganisms but do not have silica in their cell walls.

Autotrophs are organisms capable of producing their own food using energy from sunlight (photosynthesis) or inorganic chemicals (chemosynthesis). They convert raw materials into organic compounds, serving as the primary producers in ecosystems.

Coccolithophorids are a group of single-celled algae found in marine environments. They are characterized by tiny calcified plates called coccoliths that cover their cell surface. These coccoliths play a role in carbon cycling and are significant contributors to marine sediment and biogeochemical processes.

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The given chemical equation is: 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O1Oxygen16Now, let us balance the given chemical equation by following the Law of Conservation of Mass.Balancing the chemical equation: 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O1Oxygen16Number of atoms on both sides of the chemical equation should be the same. Let's check one by one.Number of Copper (Cu) atoms:

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Answer:

ruler

Explanation:

Answer:

The blanks can be completed with words in the following sequence

1) elements

compound

2) atom

3) matter

4) compound

5) chemistry

6) reactants

product

Explanation:

In H2SO4, atoms of hydrogen, sulphur and oxygen represent different elements that are combined to form the compound.

The smallest indivisible unit of matter that still retains all the properties of matter is an atom. Matter is anything that has weight and occupy space.

Atoms combine in fixed ratios to form compounds. Chemistry studies matter scientifically and pays specific attention to the changes that matter undergoes.

Considering the reaction of photosynthesis, water and carbon dioxide combine to give glucose so the water and carbon dioxide  are reactants while the glucose is the product of the reaction.

Answer:

Volume

Explanation:

The formula for density is m/v so if the mass was greater, it would be more than one. It is less than one so the volume is greater.

There are 11.6 mmol of iron in 650 mg of iron.

Given the mass of iron as 650 mg. The molar mass of iron is 55.85 g/mol.

We need to calculate how many millimoles (mmol) are present in the given amount of iron.

We will use the following conversion:

1 g = 1000 mg

1 mol = molar mass in grams

1 mmol = 0.001 mol

Number of moles of iron

= 650 mg ÷ 1000 mg/g

= 0.65 g ÷ 55.85 g/mol

= 0.0116 mol

Number of millimoles of iron

= 0.0116 mol ÷ 0.001 mol/mmolar mass of iron

= 11.6 mmol

Hence, there are 11.6 mmol of iron in 650 mg of iron. Therefore, the correct option is A. 11.6 mmol Fe.

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Answer: the answer is biotic because dear are a living factor

Explanation:

The mass number is the atomic mass rounded to a whole number, i.e., which is a value that rounds the atomic weight to a near number.

The expression mass number is used in chemistry to denote the total amount of subatomic particles i.e. atomic protons and neutrons, which are present in a given atom (for example hydrogen has only one proton and one neutron).

Therefore, with this data, we can see that mass number denotes the overall amount of protons and neutrons present in a given atom, which is equal to one in the hydrogen atom

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, chemical formula can be shown as below.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

Compound                                                          chemical formula

alkane                                                                  CnH2n+2

alkene with one double bond                            CH\(_2\)=CH\(_2\)

alkene with two double bond                             CH\(_2\)=c=CH\(_2\)

cycloalkane                                                          C\(_6\)H\(_{12}\)

Therefore, chemical formula can be shown as above.

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The element that probably forms a compound with hydrogen that has a chemical formula most and least similar to the chemical formula of the compound formed by hydrogen and selenium is sulfur.

Sulfur is in the same group as selenium, which means they have similar chemical properties. Therefore, sulfur would most likely form a compound with hydrogen that has a chemical formula similar to hydrogen selenide (H₂Se), the compound formed by hydrogen and selenium. On the other hand, chlorine and fluorine are both highly reactive nonmetals that would not likely form compounds with hydrogen in a similar way to selenium.

Potassium is a highly reactive metal and would not likely form a compound with hydrogen in a similar way to selenium either.

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As a system reaches thermal equilibrium, heat has been transferred from areas of high to low temperature.

In other words, when a system reaches thermal equilibrium, there is no longer a temperature difference between its different parts, and the heat has been evenly distributed throughout the system. This can happen through a variety of mechanisms, such as conduction, convection, and radiation, and the specific mechanism will depend on the properties of the system and the materials it is made of. Once thermal equilibrium has been reached, the system will remain at a constant temperature until something changes, such as the addition or removal of heat or a change in the materials or structure of the system.

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