how many moles of atoms are there in 1.00 lb (454g) of lead

Answer:

The correct answer would be D, reactivity

Explanation:

Some examples of different types of chemical properties include toxicity, heat of combustion, acidity, flammability, and the many other types of reactivity. I hope this helps you! :)

The chemical equations, IUPAC name, and Structural formulas are given below.

i. Chemical equations:

a) Conversion of unsaturated compound B to compound C:

B + HBr → C (Addition of hydrogen bromide to unsaturated B to form bromohexane C)

b) Conversion of compound C to compound D:

C + Na + Ether → D (Reaction of bromohexane C with sodium metal in the presence of ether to form compound D)

ii. IUPAC names:

Compound C: Bromohexane

Compound D: Hexane

iii. Structural formulae of positional isomers of compound C:

Positional isomers of bromohexane can have different bromine atoms attached at different positions along the hexane chain. Here is an example of one positional isomer of bromohexane:

1-Bromohexane:

CH3CH2CH2CH2CH2CH2Br

2-Bromohexane:

CH3CH2CH2CH2CH2CHBr

3-Bromohexane:

CH3CH2CH2CH2CHBrCH3

Therefore, the chemical equations, IUPAC name, and Structural formulas are provided above.

Learn more about IUPAC name here:

https://brainly.com/question/11516594

#SPJ1

Sodium-potassium pumps use ATP to move sodium and potassium ions simultaneously against their concentration and/or electrical gradients. Neurons need this pump to maintain the proper concentrations of sodium and potassium ions inside and outside the cell.

This action is beneficial to neurons because the proper balance of these ions is vital to neuronal function.Neurons have a higher concentration of potassium ions (K+) inside the cell and a higher concentration of sodium ions (Na+) outside the cell. Because potassium ions (K+) leak out of the cell more easily than sodium ions (Na+) leak in, the positive charge inside the cell is mostly balanced by negatively charged proteins. This resting potential is essential to neuron function and allows for electrical signaling in the nervous system.A sodium-potassium pump uses energy (ATP) to move three Na+ ions out of the cell and two K+ ions into the cell for each cycle.

This transport is essential to maintaining the proper ionic balance inside and outside the cell. By expelling three Na+ ions out of the cell, it helps to maintain the proper concentration of Na+ ions outside the cell. By moving two K+ ions into the cell, it helps to maintain the proper concentration of K+ ions inside the cell. This action is vital to neuron function and allows for the proper function of the nervous system.

To know more about electrical gradient visit:-

https://brainly.com/question/28147568

#SPJ11

These polypeptides usually contain many amino acid side chains, and different side chains have different physical and chemical properties. Amino acid side chains may interact with each other through a variety of chemical interactions, including electrostatic, hydrogen bonding, van der Waals, and hydrophobic interactions.

The strongest attraction between the arginine (arg) and glutamic acid (glu) side chains holding these polypeptides together is salt bridges.The interaction between arginine (arg) and glutamic acid (glu) side chains that holds these polypeptides together is a salt bridge. Salt bridges are electrostatic interactions between oppositely charged amino acid side chains, which may contribute to protein stability. They are especially important in ion channels and enzymes, which require a high degree of specificity and selectivity. Salt bridges occur between acidic and basic residues and are also important in the formation of secondary and tertiary protein structures.These polypeptides usually contain many amino acid side chains, and different side chains have different physical and chemical properties. Amino acid side chains may interact with each other through a variety of chemical interactions, including electrostatic, hydrogen bonding, van der Waals, and hydrophobic interactions.

To know more about properties visit:

https://brainly.com/question/29134417

#SPJ11

The 6¹⁴ text(c) activity of an ancient artifact is found to be 0.170 bq per gram of carbon. 49,305 is its age of ancient artifact.

To find the age of the artifact, we can use the formula for exponential decay:
N(t) = N₀ e(-λt)
Where N0 is the initial amount of 6¹⁴ text(c), N(t) is the current amount, λ is the decay constant (which is related to the half-life), and t is the time elapsed.
We know that the half-life of 6¹⁴ text(c) is 5730 years. This means that after 5730 years, half of the initial amount of 6¹⁴ text(c) will have decayed. So, we can find λ as follows:
λ = ln(2) / t1/2
λ = ln(2) / 5730
λ = 0.000120968
Now, we can use the activity of the artifact to find the current amount of 6¹⁴ text(c):
A = λN
N = A / λ
N = 0.170 / 0.000120968
N = 1403.94
So, the artifact currently has 1403.94 grams of 6¹⁴ text(c). We can use this value and the known initial amount of 6¹⁴ text(c) (which would have been present in the organism when it died) to find the age of the artifact:
N(t) = N₀ e(-λt)
1403.94 = N₀e(-0.000120968t)
We can solve for t:
ln(1403.94/N0) = -0.000120968t
t = -ln(1403.94/N0) / 0.000120968
We don't know the exact initial amount of 6¹⁴ text(c) in the organism, but we can assume it was the same as the current amount in the atmosphere (which is about 1.2 × 10¹² grams). So:
t = -ln(1403.94/1.2e12) / 0.000120968
t = 49,305 years
Therefore, the artifact is approximately 49,305 years old.

Learn more about Half life here

https://brainly.com/question/31666695

#SPJ11

Answer:

1. Amine.

2. Alcohol.

3. Carboxylic Acid.

4. Halocarbon.

Explanation:

The correct answer according to the tile are Amine, Alcohol, Carboxylic acid, Halocarbon.

How can hydrocarbons be classified based on their structure?

Hydrocarbons can be classified as either aromatic or aliphatic compounds, depending on the presence of a benzene ring.

What is the most common classification of hydrocarbons?

Alkanes are hydrocarbons in which all of the bonds are single bonds. Alkenes are hydrocarbons that contain a carbon-carbon double bond.

Learn more about hydrocarbon here : brainly.com/question/490217

#SPJ2

Drying to constant weight is important in order to remove all the extra moisture present in the product and also to get a pure sample after the reaction.

“Dried to constant weight” means that the drying shall be continued till at least two consecutive weights do not differ by more than 0.50 mg per g of substance taken, the second weighing will be following an additional hour of drying process.

The purpose of this technique is to completely dry a sample by heating off all of the water that might be present. This generally ensures that the mass of the sample is the mass of only the sample and it does not include a variable amount of water. We cannot tell if a sample is dry by just looking at it! The only accurate way of determining if a sample is dry is to dry the sample to its constant weight. only then we get the exact values.

To know more about drying to constant weight

https://brainly.com/question/17142851

#SPJ4

nswerllo

Explanation:

Answer:

23

Explanation:

The total number of neutrons and protons of an atom is called atomic mass. The atomic mass unit is Dalton. It is represented as Da and is the standard unit used to indicate the mass of an atom. The atomic mass of elements differs as it depends on the number of protons and neutrons in a particular element.

The atomic mass of sodium

Sodium is an alkali metal that comes first in the periodic table of the 3rd period. It is the eleventh element in the table.

The atomic number of sodium = 11

In the nucleus of the sodium, the number of neutrons = 12

The atomic mass number of sodium (Na) = 11 + 12 = 23

∴ Atomic mass of sodium = 23 g/mol

The formed cyclopropane has cis stereochemistry.

Chiral cyclopropane rings are important pharmacophores in pharmaceutical drugs and bioactive natural products, so libraries of these building blocks are an important resource for drug research and development campaigns.

A synthesis is a set of two or even more reactions that are designed to produce a specific end product. A synthetic step is a single reaction that has to be carried out independently of the other reactions in a synthesis.

The number of steps inside a synthetic sequence equals the number of reactions that need to be performed separately, i.e. the number of reactions that comprise the sequence.

By stereospecific addi-tion of singlet carbenes, cis cyclopropane could be synthesized from cis alkene. Using a Lindlar catalyst, cis alkene could be synthesized from alkynes.

To know more about the cyclopropane, here

https://brainly.com/question/29385628

#SPJ4

The pairs of elements that have their valence electrons in the same shell are; Ne and Ar, and N, As, and Bi. Option A, and E is correct.

Ne and Ar; Both Ne (Neon) and Ar (Argon) are noble gases and belong to Group 18 of the periodic table. They have their valence electrons in the third shell (n=3).

Cl and Cu; Cl (Chlorine) belongs to Group 17 and has its valence electrons in the third shell (n=3). Cu (Copper) belongs to Group 11 and has its valence electrons in the fourth shell (n=4). So, they do not have their valence electrons in the same shell.

Ag and Au; Ag (Silver) and Au (Gold) both belong to Group 11. They have their valence electrons in the fifth shell (n=5), so they do not have their valence electrons in the same shell.

In, Pb, and Bi; In (Indium), Pb (Lead), and Bi (Bismuth) belong to Group 13, 14, and 15, respectively. They have their valence electrons in the fifth shell (n=5), so they do not have their valence electrons in the same shell.

N, As, and Bi; N (Nitrogen), As (Arsenic), and Bi (Bismuth) belong to Group 15. They have their valence electrons in the second shell (n=2), so they have their valence electrons in the same shell.

K, As, and Br; K (Potassium) belongs to Group 1 and has its valence electrons in the fourth shell (n=4). As (Arsenic) belongs to Group 15 and has its valence electrons in the second shell (n=2). Br (Bromine) belongs to Group 17 and has its valence electrons in the fourth shell (n=4). Therefore, they don't have their valence electrons in the same shell.

Hence, A. E. is the correct option.

To know more about valence electrons here

https://brainly.com/question/22649122

#SPJ4

--The given question is incomplete, the complete question is

"Which of the following have their valence electrons in the same shell? A) Ne and Ar, B) Cl and Cu, C) Ag, and Au D) Pb, and Bi E) N, As, and Bi F) k, As, and Br."--

Answer:

78

Explanation:

Answer:

The OH would be .7825 and the basic solution is a strong base.

Explanation:

What you would do is -log(0.165) in your calculator which would give you 0.7825160065 as an answer. Im not sure what the significant figure is so I will not be rounding to that, but that is your answer for the first part.

The second part: because your pOH is a .7825, this would be consiered a strong base in the pOH because it is closer to 1 which is your base.

Answer:

13. A

14. C

Explanation: i tried my best

As a result, the gas's internal energy has decreased by -4.1 kJ. The negative sign denotes a decrease in the gas' internal energy, which is compatible with the gas's exerting force on its surroundings.

The following equation can be used to determine specific heat, abbreviated Cp: Cp=Qm ΔT When m is the material's mass, Q is the quantity of heat energy delivered to the substance, and T is the temperature change of the substance, we can write C p = Q m T.

According to the first law of thermodynamics, a system's internal energy change (E) equals the heat it receives (Q) minus the work it performs (W).

ΔE = Q - W

In this instance, the petrol performs 9.2 kJ of work and absorbs 5.1 kJ of heat (Q = 5.1 kJ). Inputting these values into the previous equation results in:

ΔE = 5.1 kJ - 9.2 kJ

ΔE = -4.1 kJ

To know more about heat energy visit:-

https://brainly.com/question/29210982

#SPJ1

Answer:

The answer would be 2,838,240,000

Explanation: In 1 year there are 31,536,000 and if you multiply that number by 90 you would get 2,838,240,000

Answer:

2838240000

Explanation:

1 calendar year =

31536000

X 90

=

2838240000

Answer:

Presence of an Electrolyte

Metal Surface

Oxygen or Other Oxidizing Agent

Difference in Potential

Electrochemical Pathway

Explanation:

4 moles of Fe react with 3 moles of oxygen. Therefore, the mole ratio of iron to iron oxide in this process is 4:2.

The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's halogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds.

The non-metallic element oxygen occurs naturally as a molecule. Two oxygen atoms that are tightly bound together make up each molecule. Oxygen is in a gaseous form at ambient temperature due to its low melting and boiling temperatures.

According to scientists, the oceans produce between 50 and 80 percent of the oxygen used on Earth. Oceanic plankton, which includes floating plants, algae, and certain bacteria that can photosynthesize, is the main source of this production.

Thus, 4 moles of Fe react with 3 moles of oxygen.

To learn more about oxygen, follow the link;

https://brainly.com/question/1506082

#SPJ1

Answer:

7.5275 x 10^21

Explanation:

Answer:

\(\boxed {\boxed {\sf 3 \times 10^{21} \ atoms \ Hg}}\)

Explanation:

We are asked to find how many atoms are in 1 gram of mercury.

First, we convert grams to moles. We use the molar mass or the mass of 1 mole of a substance. These values are equivalent to the atomic masses on the Periodic Table, but the units are grams per mole instead of atomic mass units.

Look up mercury's molar mass.

We convert using dimensional analysis, so we create a ratio using the molar mass.

\(\frac { 200.59 \ g \ Hg}{ 1 \ mol \ Hg}\)

We are converting 1 gram of mercury to moles, so we multiply the ratio by this value.

\(1 \ g \ Hg *\frac { 200.59 \ g \ Hg}{ 1 \ mol \ Hg}\)

Flip the ratio so the units of grams of mercury cancel out.

\(1 \ g \ Hg *\frac{ 1 \ mol \ Hg} { 200.59 \ g \ Hg}\)

\(1 *\frac{ 1 \ mol \ Hg} { 200.59}\)

\(\frac{ 1} { 200.59} \ mol \ Hg\)

\(0.004985293385 \ mol \ Hg\)

Next, we convert moles to atoms. We use Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units) in 1 mole of a substance. In this case, the particles are atoms of mercury.

We will use dimensional analysis and set up another ratio.

\(\frac {6.022 \times 10^{23} \ atoms \ Hg}{ 1 \ mol \ Hg}\)

Multiply by the number of moles we calculated.

\(0.004985293385 \ mol \ Hg * \frac {6.022 \times 10^{23} \ atoms \ Hg}{ 1 \ mol \ Hg}\)

The units of moles of mercury cancel.

\(0.004985293385 * \frac {6.022 \times 10^{23} \ atoms \ Hg}{ 1 }\)

\(3.00214368 \times 10^{21} \ atoms \ Hg\)

The original measurement of grams has 1 significant figures, so our answer must have the same. For the number we calculated, that is the ones place. The 0 in the tenths place tells us to leave the 3 in the ones place.

\(3 \times 10^{21} \ atoms \ Hg\)

There are approximately 3×10²¹ atoms of mercury in 1 gram of mercury.

Answer:

0.109728 kilometers

Explanation:

To do dimensional analysis, we have to do the unit conversion. We are given all of the conversions, so the first step is to set up the problem:

\(120 yards*\frac{3feet}{1yard}*\frac{12inches}{1foot}*\frac{2.54cm}{1inch}*\frac{1m}{100cm}*\frac{1km}{1000m}\)

To set up a dimensional analysis problem, we need to figure out what unit we need. Since we need kilometers, we need to make sure it ends up in the numerator at the end of the problem. As you can see, each of the other units gets canceled in the setup (for example, there are yards in the numerator and then the denominator of another fraction, so the two cancel each other out). Now, we have the numbers that we need, so we can solve the problem:

\(\frac{120*3*12*2.54}{100*1000}=\frac{10972.8}{100000}=0.109728 km\)

Therefore, our answer is 0.109728 kilometers

The experiment uses a catalyst.

A catalyst is a substance that increases the rate of a chemical reaction without being consumed or permanently changed in the process. It works by providing an alternative pathway for the reaction to occur, lowering the activation energy required for the reaction to take place.

Catalysts can be used in various chemical reactions, from industrial processes to biological systems.

The use of a catalyst in an experiment does not necessarily make it a "green" experiment.

While a catalyst can help increase reaction efficiency and reduce the amount of reagents needed, it does not directly address the environmental impact or sustainability of the experiment.

The other options mentioned, such as using environmentally friendly solvents, providing a high atom economy, avoiding excess waste, and avoiding the use of hazardous reagents, are all factors that contribute to making an experiment more environmentally friendly and thus could be considered as reasons for it being a green experiment.

To learn more about catalyst, visit:  https://brainly.com/question/12733574

#SPJ11

Answer:c

Explanation:

Answer:

There are 5.84*10²³ magnesium atoms in the beaker.

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.

So, to calculate the amount of magnesium atoms present in the beaker, the following rule of three is applied: if by definition of Avogadro's Number in 1 mole there are 6.023*10²³ atoms, in 0.97 moles how many atoms are there?

\(atoms=\frac{0.97 moles*6.023*10^{23}atoms }{1mole}\)

atoms=5.84*10²³

There are 5.84*10²³ magnesium atoms in the beaker.

The atomic number of an element represents the number of protons in the nucleus. In this case, the atomic number is 6. Therefore, there are 6 protons in the nucleus of this element. The correct answer is B. 6.

The atomic number of an element represents the number of protons in the nucleus. In this case, the atomic number is 6, which means there are 6 protons in the nucleus. The atomic mass is the sum of the number of protons and neutrons in the nucleus. Since the atomic mass is 12.01 and the atomic number is 6, we can subtract 6 from 12.01 to get the number of neutrons. This gives us a neutron count of approximately 6.01.

Therefore, The answer is B. 6 protons are in the nucleus of this element.

Learn More about nucleus here :-

https://brainly.com/question/21083478

#SPJ11

The Cl- equilibrium potential of a neuron placed in a solution containing mm Cl- will depend on the concentration gradient and the electrochemical properties of Cl-.

The equilibrium potential of an ion, such as Cl-, in a neuron is determined by its concentration gradient and the electrochemical forces acting on it. The equilibrium potential represents the electrical potential at which there is no net movement of ions across the cell membrane.

In the case of Cl-, if the external solution has a higher concentration of Cl- (mm Cl-), the Cl- equilibrium potential will be negative. This is because the higher concentration of Cl- outside the neuron will drive Cl- ions into the neuron through the cell membrane, resulting in a negative potential. Conversely, if the external solution has a lower concentration of Cl-, the Cl- equilibrium potential will be positive.

The equilibrium potential is influenced by the Nernst equation, which calculates the equilibrium potential for a given ion based on its concentration gradient and the charge of the ion. The Nernst equation for Cl- is E(Cl-) = RT/zF * ln([Cl-]out/[Cl-]in), where R is the gas constant, T is the temperature, z is the valence of Cl-, F is Faraday's constant, [Cl-]out is the concentration of Cl- outside the neuron, and [Cl-]in is the concentration of Cl- inside the neuron.

It's important to note that the Cl- equilibrium potential is just one component of the overall membrane potential of a neuron, which is influenced by multiple ions and ion channels. The combined effect of different ions and their equilibrium potentials determines the resting membrane potential and the excitability of the neuron.

Learn more about : Electrochemical properties

brainly.com/question/17136032

#SPJ11

The Cl- equilibrium potential of a neuron placed in a solution containing mM Cl- will be determined by the Nernst equation, which calculates the equilibrium potential for a specific ion based on its concentration gradient.

The equilibrium potential of an ion, such as Cl-, is the electrical potential at which there is no net movement of that ion across the cell membrane. It can be calculated using the Nernst equation:

E_Cl = (RT/zF) * ln([Cl-]out/[Cl-]in)

where

E_Cl is the equilibrium potential for Cl-,

R is the gas constant (8.314 J/(mol·K)),

T is the absolute temperature in Kelvin,

z is the valence of Cl- (which is -1),

F is Faraday's constant (96,485 C/mol),

[Cl-]out is the concentration of Cl- outside the cell, and

[Cl-]in is the concentration of Cl- inside the cell.

The Nernst equation calculates the membrane potential at which the electrical and concentration gradients for Cl- are balanced. The concentration gradient is determined by the difference in Cl- concentrations inside and outside the cell.

By substituting the given concentration of mM Cl- into the equation and solving, we can determine the equilibrium potential for Cl- in the neuron.

Learn more about:Equilibrium

brainly.com/question/30694482?

#SPJ11

Answer:

Galileo: "Father of Modern Science."

Aristotle: Geocentric theory." (The planests revolves around the earth.)

Torricelli: Invented the barometer. (An instrument which measures pressure.)

Copernicus: Heliocentric theory. (Aka, the planets revolves around the sun.)

Vesalius: Examined the inner workings of the human body

Newton: Developed law of universal gravitation.

Nightingale: Founded nursing profession.

Celsius: Developed metric temperature scale

I hope this helps! Thanks:)

Answer:

C) Lighting a matchstick

Explanation:

Mixing an acid and base will cause a neutralization reaction, a type of double displacement.

Photosynthesis is just a series of chemical reactions, but don't deal with the use of O2, but rather it's creation.

Reacting sodium and chlorine would make NaCl in a synthesis reaction.

Answer:

C) Lighting a matchstick

Explanation:

The molarity is 0.00024 g/l for the 1.112 grams of iron (iii) chloride into enough water to make 500.00 ml of solution.

The maximum not unusualplace manner to specific answer attention is molarity (M), that's described as the quantity of solute in moles divided through the extent of solution in liters: M = moles of solute/liters of /solution.

Read more about iron;

https://brainly.com/question/14964747

#SPJ4

A heterogeneous mixture is not uniform in composition. Hence, option C is correct.

A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.

This substance is not an element or compound, because different components could be observed in the substance.  

A pure substance is made up of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.

For example, aluminium is an element and ammonia is a compound.

This substance is not a homogeneous mixture, because different samples of the substance appeared to have different proportions of the components.

Hence, this substance is a heterogeneous mixture.

Learn more about the heterogeneous mixture here:

https://brainly.com/question/11315552

#SPJ1

Answer:

heterogeneous mixture

Explanation: