perform the following mathematical operation, and report the answer to the appropriate number of significant figures 11.65498 +156.325 =?

The density of a substance is defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as:

Density = mass / volume

For example, unknown liquid has a mass of 30.8 g, and a volume of 31.5 mL. What is the density of this liquid?

We can obtain the density as follow:

Density = mass / volume

Density of liquid = 30.8 / 31.5

Density of liquid = 0.98 g/mL

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hello my name is bob free give me the free give me th efree points

Explanation:

Answer:

Friction of wind against the ocean surface

Answer:

Atoms dance in a cosmic ballet,

Each one with a role to play,

They join together in a grand display,

Creating molecules in an endless array,

Organizing matter in a beautiful way.

Answer:

All of them have a nucleus..

Explanation:

Pretty simple stuff.  There's no cell without one.

Carlita’s body is made up of many cells. The one thing that all her cells have in common is they have the same kind of genes.

Genes are tiny pieces of spherical hereditary material that are bead-shaped and found on chromosomes. They hold the organism's genetic makeup. The number of genes on each chromosome is incalculable.

The hereditary material that makes up chromosomes is arranged in x shapes inside the nucleus. DNA, genes, and proteins make it up. An organism's genotype is distinct from other organisms because of its distinct genetic makeup, and this distinction can be passed down from one generation to the next.

Traits may be influenced by genes, the environment, or a mixture of the two. Quantitative features can also be qualitative, such as eye colour (such as height or blood pressure).

Therefore, numerous cells make up Carlita's body. Her cells all share the same type of genes, which is the only thing that unites them.

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Fe(ii) and Fe(iii) ions differ by E) 1 electron.

Ferric is the term used for an iron atom that has lost three electrons from the valence shell, on the other hand, ferrous is the term used for an iron atom that has lost two electrons from the valence shell.

As one shares two electrons while the other shares three electrons therefore they differ by one electron.

Fe(iii) is more stable due to its half-filled subshell while Fe(ii) is unstable in nature. There is a partially-filled d orbital in Fe(ii) resulting in its instability as half-filled and completely filled orbitals are more stable as compared to the partially filled orbitals.

Although a part of your question is missing, you might be referring to this question:

Iron forms compounds as both a ferrous Fe(II) and a ferric Fe(III) ion. These two ions differ by:

A) 1 proton

B) 1 neutron

C) 2 protons

D) 2 electrons

E) 1 electron

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Answer:

JPG

Explanation:

Answer:

I believe JPG would be the correct file.

Explanation:

Answer:

1. V = 1.47L

Explanation:

1) Using PV = nRT

Where;

P = pressure (atm)

V = volume (L)

R = gas constant (0.0821 Latmk mol)

n = number of moles

T = temperature (K)

To get number of moles, we say mole = mass/molar mass

Molar Mass of C2H2 = 12(2) + 1(2)

= 24 + 2 = 26g/mol

mole = 3.86/26

mole = 0.148mol

T (K) = 28.5°C + 273.15

T(K) = 301.65K

PV = nRT

2.5 × V = 0.148 × 0.0821 × 301.65

2.5V = 3.665

V = 3.665/2.5

V = 1.466

V = 1.47L

R =

PV = nRT

P1 V1\ n1 T1 =P2 V2/ n2 T2

1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature

of 28.5 °C?

2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has

cooled?

The isotope symbol that fits each description is as follows: 68 neutrons, 47 electrons is Ag b. mass number = 197, 79 electrons is Au c. atomic number = 86, 136 neutrons is Rn d. atomic number = 76, mass number = 192 is Os.

Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.

The name "isotope" refers to the fact that different isotopes of the same element occupy the same location on the periodic table. The word "isotope" is derived from Greek origins that mean "the same place".

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Evidence of a chemical change will be Burning.

Changes are either classified as physical or chemical changes. Chemists learn a lot about the nature of matter by studying the changes that matter can undergo.

A change can be physical if no ties are made or broken. They entail rearranging molecules but do not alter them.

A few examples of physical changes are:. shifts in state (changes from a solid to a liquid or a gas and vice versa).

When bonds between molecules or atoms are created, disrupted, or both, chemical changes result. This implies that a substance with a particular set of properties—such as melting point, color, flavor, etc.—becomes a substance with a different set of characteristics.

The burning of paper and cloth involves both a physical and a chemical change, which can be reversed more easily than the boiling or heating of water. If water is boiled for more time it changes from a chemical state to a vapor state, which is a physical change.

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The two types of nucleophilic substitution reactions are SN1 and SN2. SN2 has two molecules, whereas SN1 only has one.

A nucleophilic molecule replaces a different atom or group of atoms on a molecule, known as the leaving group, in a nucleophilic substitution reaction. The substrate molecule is attacked by the nucleophilic molecule's abundant electrons.

A process in which one functional group or atom is swapped out for another negatively charged functional group or atom is known as a nucleophilic substitution reaction.

The SN1 reaction is monomolecular, whereas the SN2 reaction is bimolecular.

Any substitution reaction in which an atom or functional group is changed for one that has a single pair of electrons, a negatively charged ion, or both. The negatively charged ion or the atoms/molecules with lone pairs of electrons will be pulled to the positively charged area of an atom or complex in an effort to replace the functional group or atom already attached to the positive location.

Therefore, The two types of nucleophilic substitution reactions are SN1 and SN2. SN2 has two molecules, whereas SN1 only has one.

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To calculate ΔG∘rxn at 298K, we can use the formula: ΔG∘rxn = -RT ln Kp. Where R is the gas constant (8.314 J/K*mol), T is the temperature in Kelvin (298K), and Kp is the equilibrium constant.

First, let's convert Kp to Kc using the formula:

Kp = Kc(RT)Δn

Where Δn is the difference in the number of moles of gas on the product side and the reactant side. In this case, Δn = 2 - (1 + 1) = 0.

So, Kc = Kp/RT = 436/((8.314 J/K*mol)*(298K)) = 0.0554 M.

Now we can calculate ΔG∘rxn:

ΔG∘rxn = -RT ln Kc = -(8.314 J/K*mol)(298K) ln (0.0554 M) = -13.2 kJ/mol

Therefore, ΔG∘rxn at 298K for the reaction I2(g) + Br2(g) ⇌ 2IBr(g) is -13.2 kJ/mol.

The standard Gibbs free energy change (ΔG°rxn) at 298 K for the following reaction: I2(g) + Br2(g) ⇌ 2IBr(g), with Kp = 436.

To calculate ΔG°rxn, we can use the formula:
ΔG°rxn = -RT * ln(Kp)

Where R is the gas constant (8.314 J/mol K), T is the temperature in Kelvin (298 K), and Kp is the equilibrium constant (436).

Step 1: Multiply R and T:

Step 2: Calculate the natural logarithm (ln) of Kp:

Step 3: Multiply the values obtained in steps 1 and 2:

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12.33 liters of oxygen are produced when 45.0 g of KClO3 decomposes.

The mass in grams of one mole of a material is its molar mass. The molar mass of a material may be found by adding the molar masses of its constituent atoms, as demonstrated in this video. The computed molar mass may then be used to convert between mass and the quantity of moles in the material.

KClO3 ------>  kcl+ 3/2 O2

KClO3 122.55 gm in terms of molar mass.

Given mass = 459 moles of KCl03= 45 10.367 moles 122.55,

we know that the reaction produces 1 mole of kuo and 3 moles of O2.

I mole + 3/2 mule 02.. 0.367 mole X mole 02

X= 0.367X3 =0.5505 mol using the straightforward unitary technique.

Oxygen capacity at STP = 0.5505 x 22.41

12.33 liters

12.33 liters of oxygen are produced when 45.0 g of KClO3 decomposes.

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Tt is important to verify the accuracy of the statements provided in the multiple-choice questions. By understanding the concepts and reactions discussed, you can confidently select the correct statements and apply them in relevant chemical contexts.

MC1: Grignard reagents and organolithium reagents can indeed be prepared in the presence of acidic functional groups. This is because both reagents are strong bases that can deprotonate the acidic functional groups. For example, a Grignard reagent, such as phenylmagnesium bromide (C6H5MgBr), can react with carboxylic acids to form a Grignard reagent. In this reaction, the carboxylic acid donates a proton to the Grignard reagent, resulting in the formation of a new carbon-carbon bond.

MC2: Gilman reagents, which are organocuprates, can indeed react with formaldehyde (HCHO) and give alcohols. In this reaction, the Gilman reagent acts as a nucleophile and attacks the electrophilic carbonyl carbon of formaldehyde. The resulting intermediate undergoes a proton transfer and then a reduction, resulting in the formation of an alcohol.

MC3: An S N2 attack on a chiral center does indeed result in the inversion of stereochemistry. In an S N2 reaction, the nucleophile approaches the chiral center from the backside of the leaving group. This leads to the inversion of the stereochemistry because the substituents on the chiral center swap positions.

MC4: Acetal formation cannot occur in a basic environment as the -OH group is a poor leaving group. In acetal formation, a molecule with two -OR groups (where R can be alkyl or aryl) reacts with an aldehyde or ketone in the presence of acid. The acid protonates the carbonyl oxygen, making it a good leaving group. In a basic environment, the -OH group is not protonated and thus cannot leave.

MC5: Carbon dioxide (CO2) does not readily react with Gilman reagents to form carboxylic acids. Instead, Gilman reagents are typically used to react with organic halides to form new carbon-carbon bonds.

MC6: Alkynyl anions, formed by deprotonating an alkyne with a strong base, are indeed powerful nucleophiles that can react with epoxides, aldehydes, and ketones. These reactions involve the attack of the alkynyl anion on the electrophilic carbon of the epoxide or carbonyl compound, resulting in the formation of new carbon-carbon bonds.

MC7: Simple phosphonium ylides, such as the Wittig reagent, can indeed form the Z product, which is the thermodynamic product. The Z product is formed when the ylide reacts with a carbonyl compound. The formation of the Z product is favored because it is more stable than the E product due to steric interactions.

MC8: When a reaction is under kinetic control, the ratio of the products formed is indeed determined by the relative energies of the transition states. The product that is formed faster, and thus is more favorable in terms of kinetics, will be the major product. The relative energies of the transition states can be influenced by factors such as the nature of the reactants and the reaction conditions.

MC9: It is true that a significant concentration of strong acids and strong bases cannot coexist in the same reaction. Strong acids and strong bases readily react with each other, resulting in a neutralization reaction. Therefore, it is important to carefully control the concentrations of acids and bases in a reaction to avoid undesired side reactions.

MC10: The driving force for the Wittig reaction is indeed the formation of a strong carbon-carbon double bond. In the Wittig reaction, a phosphonium ylide reacts with a carbonyl compound to form an alkene. The formation of the alkene is energetically favorable due to the stability of the carbon-carbon double bond.

MC11: A baby-shark trap is not a term related to chemistry, and thus it is not relevant to the topic.

MC12: A phosphonium ylide can indeed be formed from a 3° haloalkane. A 3° haloalkane, such as 3° bromoalkane or 3° chloroalkane, can undergo an elimination reaction in the presence of a strong base to form an alkene. This alkene can then react with a phosphine to form the phosphonium ylide.

MC13: Adding water to a reversible dehydration reaction would not form an alkene. In a reversible dehydration reaction, water is removed to form an alkene. Adding water would result in the reverse reaction, which is the hydration of the alkene to form an alcohol.

MC14: Adding water to the reversible hydrolysis of an ester reaction would not form an ester. In a reversible hydrolysis reaction of an ester, water reacts with the ester to form a carboxylic acid and an alcohol. Adding water to the reaction would not drive the reaction towards the formation of the ester.

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Answer:

Mass is lost due to the conversion of mass to energy

Explanation:

The question is not complete, the complete question is given as:

        \(^{235}_{72}U +^{1}_{0}n\)                       ⇒        \(^{140}_{56}Ba+^{93}_{36}Kr+3^{1}_{0}n+energy\)

total mass equals 236.053 u              total mass equals 235.868 u

Which statement explains the energy term in this reaction? (1) Mass is gained due to the conversion of mass to energy. (2) Mass is gained due to the conversion of energy to mass. (3) Mass is lost due to the conversion of mass to energy. (4) Mass is lost due to the conversion of energy to mass.

Answer: From Einstein’s equation  E = mc², when a radioisotope element undergoes fission or fusion in a nuclear reaction, it loses a tiny amount of mass.This mass lost is converted to energy.

The law of conservation of energy  holds for this type of reaction (i.e  the sum of mass and energy is remains the same in a nuclear reaction). Mass changes to energy, but the total amount of mass and energy combined remains the same before and after a nuclear reaction.

From the reaction above, the total decrease in mass = 236.053 - 235.868 = 0.185 u

Answer:

Putting fire below them

Explanation:

Fire is a method used for burning stuff faster as the heat transforms into energy

18.5 * 10² milliliters of NaCl solution have to use to deliver 18.5g of NaCl.

Given data:

1% (m/v) NaCl

For 18.5g

1g --------------------------100ml

18.5g ---------------- Xml

X = 1850ml

The mass/ volume percent of a result is defined as the rate of the mass of solute that's present in a result, relative to the volume of the result, as a whole. Because this type of attention is expressed as a chance, the indicated proportion must be multiplied by 100.

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Based on the percentage composition, it can be deduced that the compound is likely an organic molecule containing carbon, hydrogen, and oxygen.

What is the molecular weight of the compound if it contains 0.5 moles of oxygen?

To calculate the molecular weight of the compound if it contains 0.5 moles of oxygen, we need to first determine the atomic weight of each element present in the compound. The atomic weight of carbon is 12 g/mol, hydrogen is 1 g/mol, and oxygen is 16 g/mol. Multiplying the number of moles of each element by its atomic weight, we can find the total weight of each element in the compound. For oxygen, this would be 16 g/mol * 0.5 moles = 8 g. Adding up the total weight of carbon, hydrogen, and oxygen, we can determine the molecular weight of the compound. The large presence of carbon suggests that it is a hydrocarbon or a derivative of a hydrocarbon, while the presence of oxygen suggests it is an organic compound.

Further analysis and testing would be necessary to determine the exact structure and identity of the compound.

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Complete question

A compound is found to contain 54.5% carbon, 9.1% hydrogen, and 36.4% oxygen. Determine the simplest formula.

The best practice when placing test tubes in a centrifuge is to balance the load.

To do this, place the test tubes on opposite sides of the rotor or bucket and evenly distribute the weight of the samples. Additionally, make sure to secure the lids of the test tubes with tape.

This will help prevent any of the samples from spilling during the centrifugation process and potentially damaging the centrifuge. Additionally, it is important to ensure that the test tubes are not touching each other, as this can also cause them to spill.

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Answer:

The ball you want to submerge displaces the water occupied in the ball's volume. ... In water the concrete has a buoyancy pressure force equal to the displaced liquid's weight and weighs only 120 pounds until it reaches the surface.

Explanation:

Answer:

Explanation:

Atomic mass for vanadium= 50.9415 u

Answer:

i believe its b but i could be wrong

Answer:

it is an endothermic reaction

Explanation:

This is because there is a rise in temperature from 20 to 46. this means that the reaction takes in heat from the suuroundings

Answer:

172.385 g/mol

Explanation:

Magnesium Tartrate is C4H4MgO6

C - 12.01 g/mol

H - 1.01 g/mol

Mg - 24.305 g/mol

O - 16.00 g/mol

12.01(4) + 1.01(4) + 24.305 + 16(6) = 172.385 g/mol

Answer:

172.38

Explanation:

\(C_4H_4MgO_6\\C=12.01\\H=1.01\\Mg=24.30\\O=16.00\\\\4(12.01)+4(1.01)+24.30+6(16.00)\\48.04+4.04+24.30+96\\=172.38\)

C = 12.01

H=1.01

Mg=24.30

O =16.00

4(12.01)+4(1.01)+24.30+6(16.00)

48.04 +4.04+24.30+96

=172.38

Answer:

True

Explanation:

This is true because every chemical reacts differently

The reaction is;

2Na + 2H2O → 2NaOH + H2

Answer:

4.4 × 10^(23) atoms

Explanation:

The reaction is;

2Na + 2H2O → 2NaOH + H2

2 moles of Na produces 1 mole of H2 from the equation reaction.

Thus, since 8.2 L of hydrogen gas at STP are produced. And we know that at STP, 1 mole of a gas will have a volume of 22.4 L, and also, We know according to avogadro's number that, 1 mol = 6.02 × 10^(23) atoms, Thus;

8.2 L of H2 × (1 mole of H2/22.4 L) × (2 mole of Na/1 mole of H2) × (6.02 × 10^(23) atoms/1 mole of Na) = 4.4 × 10^(23) atoms

The value of the Ksp can be obtained in terms of s as 4s^3.

The term Ksp has to do with the solubility product. It is the extent to which a substance can dissolve in water. We know that the solubility of the substance can be given as;

M(OH)2(s) ⇔M^+(aq) + 2OH^-(aq)

Ksp = s * (2s)^2

Ksp = s * 4s^2

Ksp = 4s^3

Thus it follows that the value of the Ksp can be obtained in terms of s as 4s^3.

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Answer:

molar mass of N + 3 × molar mass of H

Explanation:

took the test and got it right

Molar mass is the proportion of the mass of the substance to the moles. The molar mass of ammonia is calculated as, the molar mass of N + 3 × molar mass of H. Thus, option c is accurate.

The molar mass of any substance is the mass in grams divided by the mole of the substance. It is given in g/mol. It is calculated as:

Molar mass = Mass ÷ Moles

In Ammonia there are one nitrogen and three hydrogen atoms, and hence the molar mass is given as,

Molar mass of N + 3 × Molar mass of H

Therefore, option c. molar mass of N + 3 × molar mass of H is correct.

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Solutions are mixtures that consist of two or more substances that are evenly distributed throughout the mixture.

Solutions are special because all of the substances in the solution are completely dissolved and cannot be seen with the unaided eye. Chemistry 1001 solutions are typically mixtures of solvents and solutes. A solvent is the substance that does the dissolving, and the solute is the substance that is dissolved.

Examples of solvents include water and alcohol, and examples of solutes include salts and sugar.

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