Enter the molecular formula for butane, c4h10 c 4 h 10.

Considering the definition of isotopes and atomic mass of an element, the atomic mass of iron is 55.9012 amu.

An isotope is a form of a chemical element in which the atoms have the same number of protons, but a different number of neutrons.

The atomic mass of an element is the weighted average mass of its natural isotopes, considering the relative abundance of each of them.

In this case, you know iron has four isotopes:

Then, the atomic mass of iron can be calculated as:

atomic mass of iron= 53.9396 amu×0.0582 + 55.9349 amu×0.9166 + 56.9354 amu×0.0219 + 57.9333 amu×0.0033

atomic mass of iron= 55.9012 amu

Finally, the atomic mass in this case is 55.9012 amu.

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The density of mercury in SI units is 13600 kg/m3.

1 kg of weight is equal to 1000 grams of weight [SI to CGS conversion].

Thus, it can be written as,

1kg=1000 gm

1gm=1kg/100

Now, 1 meter is equal to 100 centimeters [SI to CGS conversion].

1 m =100 cm

1 cm=1 m/100

Thus, it can be written as

 1\(m^{3}\) =\((10^{2})^{3}\) \(cm^{3}\)

1\(cm^{3}\)=\(\frac{1m^{3}}{(10)^{6}}\)

  so  13.6  gm/\(cm^{3}\)    = 13.6 *    \(\frac{\frac{1kg}{1000}}{\frac{1m^{3}}{(10)^{6}}}\)  

                                 =13.6 * (10^6)/(10^3)

                                = 13.6 * (10^3) = 13600kg/\(m^{3}\)

so, the value of density of mercury in SI unit is 13600 kg/\(m^{3}\)\

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The balanced chemical equation is:CaCl2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaCl(aq)

To write the net ionic equation, we eliminate the spectator ions (Na+ and Cl-):Ca2+(aq) + CO32-(aq) → CaCO3(s

A net ionic equation is a chemical equation that shows only those ions and molecules that undergo a chemical reaction in solution. It is written by eliminating the spectator ions from the overall chemical reaction.To write net ionic equations for the formation of precipitates, we first need to identify the reactants that form the precipitates. These are typically two aqueous solutions that contain ions that can react to form an insoluble solid product, or precipitate. Once we have identified the reactants, we can use solubility rules to determine whether or not a precipitate will form. If a precipitate will form, we can then write the balanced chemical equation for the reaction, and then write the net ionic equation by eliminating the spectator ions.

Let's look at some examples:

1. AgNO3 + NaCl → AgCl↓ + NaNO3

The reactants in this equation are AgNO3 and NaCl, and the product is AgCl, which is insoluble and forms a precipitate. The balanced chemical equation is:

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)

To write the net ionic equation, we eliminate the spectator ions (Na+ and NO3-):

Ag+(aq) + Cl-(aq) → AgCl(s)

2. Pb(NO3)2 + 2NaI → PbI2↓ + 2NaNO3

The reactants in this equation are Pb(NO3)2 and NaI, and the product is PbI2, which is insoluble and forms a precipitate. The balanced chemical equation is:

Pb(NO3)2(aq) + 2NaI(aq) → PbI2(s) + 2NaNO3(aq)

To write the net ionic equation, we eliminate the spectator ions (Na+ and NO3-):

Pb2+(aq) + 2I-(aq) → PbI2(s)3. CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl

The reactants in this equation are CaCl2 and Na2CO3, and the product is CaCO3, which is insoluble and forms a precipitate.

The balanced chemical equation is:

CaCl2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaCl(aq)

To write the net ionic equation, we eliminate the spectator ions (Na+ and Cl-):

Ca2+(aq) + CO32-(aq) → CaCO3(s)

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Answer:

This is happened because, in water there is strong intermolecular force of attraction because of H- bonding. But, in case of HCl, the force of attraction is not so strong

The state of water at room temperature is liquid while Hydrogen chloride is a gas at room temperature. In consideration of three Van der Waals forces ( Keesom,  Debye, and London) which both Water and hydrogen chloride exhibit, Water exhibits hydrogen bonding, which Hydrogen chloride doesn't.

Since water has strong hydrogen bonds, more energy is required to boil water. Water has an electronegative O, water can form hydrogen bonds with other H20 molecules. We know that the hydrogen bond is stronger than the permanent dipole interaction in hydrogen chloride.

Since more energy is required to overcome the hydrogen bond in water.

Hence, the boiling point of water is 100°C while hydrogen chloride is -115°C.

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The mineral that is described here is Mica.

We would have to note that when we are talking about a mineral in this case, we are going to deal with a kind of substance that is composed of several atoms and is filled with various uses as a precious material.

In this case we are told that  a mineral has one plane of cleavage and splits into sheets. We know that mica is a mineral that could have cleavages as has been described in the question that we are supposed to deal with here.

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Step 1

The reaction involved here:

3 FeO + 2 Al => 3 Fe + AI2O3 (Don't forget to completed it and balance it)

---------------

Step 2

Data provided:

125 grams of FeO react with 25.0 grams of AI

--

Data needed:

The molar masses of:

FeO) 71.8 g/mol

Al) 27.0 g/mol

Fe) 55.8 g/mol

---------------

Step 3

The limiting reactant:

By stoichiometry,

3 FeO + 2 Al => 3 Fe + AI2O3

3 x 71.8 g FeO ----- 2 x 27.0 g Al

125 g FeO ----- X

X = 125 g FeO x 2 x 27.0 g Al/3 x 71.8 g FeO

X = 31.3 g Al

For 125 g of FeO, 31.3 g of Al is needed, but there is 25.0 g of Al, so the limiting reactant is Al.

-------------

Step 4

The amount of Fe produced:

By stoichiometry,

3 FeO + 2 Al => 3 Fe + AI2O3

2 x 27.0 g Al ---- 3 x 55.8 g Fe

25.0 g Al --- X = 77.5 g Fe

Answer: 77.6 g Fe (the closest value)

Considering the definition of pH,  the pH of a 6.3×10⁻⁸ M solution of H₃O⁺ is 7.2.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]= -log [H₃O⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, you know that [H₃O⁺]= 6.3×10⁻⁸ M. Replacing in the definition of pH:

pH= -log (6.3×10⁻⁸ M)

Solving:

pH=7.2

Finally, the pH of a 6.3×10⁻⁸ M solution of H₃O⁺ is 7.2.

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Answer:

Firms produce goods and services,which they sell to households in return for revenue.

Answer: Goods and Services

Explanation:

To calculate the pH for each case in the titration of 25.0 mL of 0.200 M pyridine (C5H5N(aq)) with 0.200 M HBr(aq), we need to consider the reaction between pyridine (a weak base) and HBr (a strong acid).

Before any HBr is added, the pyridine is in its basic form and the pH can be calculated using the pOH equation.
1. Calculate the pOH:
Since pyridine is a weak base, we can use the Kb value to calculate the pOH.
Kb = [OH-]^2 / [pyridine]
[OH-] = sqrt(Kb * [pyridine])
[OH-] = sqrt(1.7 × 10^-9 * 0.200)
[OH-] = 2.60 × 10^-5 M

2. Calculate the pOH:
pOH = -log[OH-]
pOH = -log(2.60 × 10^-5)
pOH ≈ 4.59
3. Calculate the pH:
Since pH + pOH = 14, we can calculate the pH using the pOH value.
pH = 14 - pOH
pH = 14 - 4.59
pH ≈ 9.41
So, before any HBr is added, the pH of the pyridine solution is approximately 9.41.

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To solve this problem, we can use the ideal gas law, which states that PV=nRT, where P is the pressure in atmospheres.

V is the volume in liters, n is the number of moles, R is the gas constant (0.0821 L atm/mol K), and T is the temperature in Kelvin. First, we need to convert the temperature from Celsius to Kelvin by adding 273.15, giving us T=303.15 K.
Next, we can plug in the values we have,P(10.00 L) = (0.089 mol)(0.0821 L atm/mol K)(303.15 K) Solving for P, we get P=2.12 atm. Therefore, the gas in the container exerts a pressure of 2.12 atm.

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Answer:

C

Explanation:

Runoff occurs when there is more water than land can absorb so  it would be C.

Answer:

A

Explanation:

The sun heats up earths surface

The Earth's atmospheric CO2 concentration was around 280ppm before human activities, but since the Industrial Revolution, burning fossil fuels has increased it to above 400ppm, well outside the range.

The concentration of CO2 in the Earth's atmosphere prior to significant human influences was 280ppm.

Before human activities, such as burning fossil fuels, deforestation, and industrial processes, the concentration of carbon dioxide in the atmosphere was relatively stable for thousands of years. This pre-industrial concentration of CO2 was around 280 parts per million (ppm).

To put it into perspective, 280ppm means that for every million molecules of air, around 280 of them were CO2 molecules. This level was maintained through a balance between natural sources of CO2, like volcanic activity and respiration, and natural sinks, such as photosynthesis and ocean absorption.

Since the Industrial Revolution, the burning of fossil fuels has significantly increased the concentration of CO2 in the atmosphere. Currently, the concentration is above 400ppm, which is considered to be well outside the range seen in the past 800,000 years.

In summary, the concentration of CO2 in the Earth's atmosphere prior to significant human influences was approximately 280ppm.

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In the following question, among the conditions given, if 0.50 litre of a 2.0 m HCI is diluted with h2o to a volume of 1.0 litre, the molarity of the final solution is Molarity = moles of solute/volume of solution molarity = 1.0 mol / 1.0 LMolarity = 1.0 MTherefore, the molarity of the new solution is 1.0 M.

To determine the molarity of a solution, we use the formula Molarity = moles of solute/volume of solution in litres (L). We are given the initial volume and molarity of the hydrochloric acid (HCl), as well as the final volume of the solution. Since HCl is the solute, we need to calculate the moles of HCl present in the initial solution before we can calculate the molarity of the final solution.

Given that the initial volume of the hydrochloric acid (HCl) is 0.50 L and its molarity is 2.0 M. To calculate the moles of HCl in the initial solution, we use the formula: moles = molarity x volume (in litres) moles of HCl = 2.0 M x 0.50 L = 1.0 molNow, the total volume of the final solution is 1.0 L, and this volume includes the 0.50 L of the initial HCl solution. Thus, the remaining volume of the solution must be water. Therefore, the volume of water in the final solution is 1.0 L - 0.50 L = 0.50 L. To calculate the molarity of the final solution, we need to determine the moles of HCl present in the final solution. We can do this by using the formula: moles = molarity x volume (in litres)moles of HCl = 1.0 mol (since we are not adding or removing HCl in the dilution)volume of final solution = 1.0 L (given)Thus, the molarity of the final solution is: Molarity = moles of solute/volume of solution molarity = 1.0 mol / 1.0 L Molarity = 1.0 M Therefore, the molarity of the new solution is 1.0 M.

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Answer:

I don't think so that there is anything that can reduce negative impact of disaster.

Answer:

it damage our home,field

The pKa values for sodium dihydrogen phosphate (NaH2PO4) are 2.15 and 7.20, while the pKa values for disodium hydrogen phosphate (Na2HPO4) are 2.15 and 7.20 as well.

To calculate the resulting pH of the mixture, you need to consider the pKa values of the phosphate buffer system.
Since the initial concentrations and volumes of the solutions are given, you can calculate the final concentrations of the buffer components.

The final concentration of NaH2PO4 will be 10 mM

(20 mM * 200 mL / 300 mL)

and the final concentration of Na2HPO4 will be 20 mM

(40 mM * 100 mL / 300 mL).
To find the pH, you can use the Henderson-Hasselbalch equation, which is

pH = pKa + log ([base] / [acid]).

In this case, the base is Na2HPO4 and the acid is NaH2PO4. Using the pKa values, you can plug in the concentrations of the base and acid to find the resulting pH.
However, since the pKa values are the same for both components, the pH of the resulting solution will be equal to the pKa value, which is 7.20.

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Answer:

\(v = \sqrt{ \frac{2ke}{m} } \)

option D is the correct option.

Here,

If an object of mass 'm' moving with a velocity'v' then,

\(kinetic \: energy = \frac{1}{2} m {v}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: {v}^{2} = \frac{2ke}{m} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: {v}^{2} = \sqrt{ \frac{2ke}{m} } \)

hope this helps...

Good luck on your assignment..

Answer:

it's D on edge2021

Explanation:

Answer:

water displacement

that is c

Since we are starting from the number of atoms of Nickel, we need to know two sets of formulas:

mass = moles × molar mass

moles = atoms ÷ Avogadro's Number

⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

   mass = [(7.4 × 10¹⁵ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (58.69 g/mol)

             = 7.21 × 10⁻⁷ g

Answer:

decent

Explanation:

Option A. 3Cu + 2AlCl3 --> 3CuCl2 + 2Al is correct.

The products of the reactants Cu + AlCl3 are 3CuCl2 and 2Al. This is a single replacement reaction, in which the copper metal is replaced by the aluminum ions in the aluminum chloride compound, forming copper chloride and aluminum metal.

In a chemical reaction, reactants are substances or elements that interact with or combine with another substance or element (the process of transformation of chemical substances). Typically, these are at the start of the arrows in chemical processes. To further grasp the word, let's look at an example of a chemical equation (a symbol for a chemical reaction).

Water is created when hydrogen and oxygen are combined.

The chemical makeup of water is shown in the aforementioned reaction. A chemical reaction's arrow denotes the direction in which the reaction takes place. This is how the equation would seem if we used the scientific names for its components.

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The spectator ions for the reaction of perchloric acid with sodium hydroxide are Na+ and Cl-.The spectator ions are those ions that are present on both sides of the chemical equation but do not participate in the reaction.

These ions do not change their oxidation state or form new compounds. Therefore, they are considered to be spectators and are excluded from the overall ionic equation. The equation for the reaction of perchloric acid with sodium hydroxide is:HClO4 + NaOH → NaClO4 + H2O. Sodium ions and chloride ions are the spectator ions in this reaction. Sodium ions (Na+) are present on both sides of the equation, and they do not participate in any chemical reaction.

They remain in the same oxidation state and do not form any new compound. Hence, Na+ ions are spectator ions in this reaction. Similarly, the chloride ions (Cl-) are also present on both sides of the equation and are not involved in any reaction. Therefore, they are also spectator ions.

In summary, the spectator ions for the reaction of perchloric acid with sodium hydroxide are Na+ and Cl-. These ions are present on both sides of the equation but do not participate in any chemical reaction. They are considered spectators and are excluded from the overall ionic equation.

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The molecular formula CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

Organic compounds are compounds that are obtained from organic materials.

The most common organic compound are the hydrocarbons,

The hydrocarbons includes the alkanes, alkenes, alkynes, etc.

The given compound CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

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Answer:

4

Explanation:

Elements in group 14 have 4 valence electrons. Meaning that to achieve a stable octet they need to either gain or lose 4 electrons in total.

Answer:

C

Explanation:

Cellular respiration is the metabolic process and is a reduction-oxidation reaction that yields ATP molecules. Thus, option C is accurate.

It is a redox reaction that utilizes glucose and oxygen molecules to release carbon dioxide and energy in the form of ATP. This energy released is used to drive the functions and roles of the cells.

The food molecule, glucose is broken in the presence of the oxygen molecule to release the carbon dioxide and the energy from the cells that are in the form of adenosine triphosphate molecule.  

Therefore, option C. cellular respiration is a redox reaction is correct.

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Answer:

3NH4OH +  H3PO4  -----> (NH4)3PO4 +  3H2O

Explanation:

L.H.S

3NH4OH +  H3PO4

R.H.S

(NH4)3PO4 +  3H2O

The volume of 6.9 mol of oxygen at 233 K and a pressure of 4.0 atm is approximately 12.0L.

To calculate volume of a gas, we can make use of Ideal Gas Law equation. It is a fundamental equation in thermodynamics that describes the behaviour of an ideal gas under certain circumstances. It relates pressure(P), volume(V), number of moles (n), and temperature(T) of an ideal gas using the equation:

PV = nRT

Where P = Pressure of the gas,

           V = Volume of the gas,

           n = Number of moles of the gas,

           R = Ideal gas constant commonly expressed as 0.0821  L·atm/(mol·K) or 8.314 J/(mol·K),

          T = Temperature of the gas.

In the question, we are given with:

n = 6.9 mol

T = 233 k

P = 4.0 atm

Substituting the above values in the equation to find the volume, we get:

4.0 * V = 6.9 * 0.0821 * 233

V = (6.9 * 0.0821 * 233) / 4.0

V = 11.9997 (approximately 12.0)

Therefore, The volume of 6.9 mol of oxygen at 233 K and a pressure of 4.0 atm is approximately 12.0L.

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One type of neon has 10 neutrons, while other types have 11 neutrons and 12 neutrons. The term best defines the different types of neon atoms in nature is known as Isotopes.

Isotopes are atoms of the similar element that have indifferent numbers of neutrons but the equal number of proton and electrons.

The different in the neutrons results the same element with different masses.

Neon is a chemical element. Its symbol is denoted by Ne.

It is called as Nobel gas and the most stable element.

If talking about the properties it is odorless , uncolored, monoatomic, chemically inactive.

Also called as inert gas.

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Answer: isotopes

Explanation:

i took the test

Predominant ionic form of Phe-Ala-Val (F-A-V) at pH 7.3 is as follows: Peptide structure is a long-chain linear polymer consisting of Amino acids joined by Peptide bonds. When the -COOH group of one amino acid and the -NH2 group of another amino acid combine and release a molecule of water, the peptide bond is formed.

The simplest amino acid, Glycine (H2N-CH2-COOH), contains an H atom as its side chain. The basic structure of an amino acid comprises a carbon atom known as the α-carbon atom. It is linked to an amino group (-NH2) and a carboxyl group (-COOH).

Predominant ionic form of Ile-Leu-Arg (I-L-R) at pH 7.3 is as follows: Peptide structure is a long-chain linear polymer consisting of Amino acids joined by Peptide bonds.

When the -COOH group of one amino acid and the -NH2 group of another amino acid combine and release a molecule of water, the peptide bond is formed. The simplest amino acid, Glycine (H2N-CH2-COOH), contains an H atom as its side chain. The basic structure of an amino acid comprises a carbon atom known as the α-carbon atom. It is linked to an amino group (-NH2) and a carboxyl group (-COOH).

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Saturated fatty acids