An atom has a diameter of 3.50 Å and the nucleus of that atom has a diameter of 6.50×10−5 Å . Determine the fraction of the volume of the atom that is taken up by the nucleus. Assume the atom and the nucleus are a sphere.
fraction of atomic volume:
1.43236148
×10
−14
Calculate the density of a proton, given that the mass of a proton is 1.0073 amu and the diameter of a proton is 1.73×10−15 m .
density:
g/cm 3

Answer:

Explanation:

The number of atoms in one mole of a substance is called Avogadro's number and is approximately 6.022 x 10²³ atoms/mol.

There are 2.02 moles of atoms in one mole of a substance.

The number of atoms in one mole of Na (sodium) is 6.022 x 10²³ atoms/mol

In one mole of NaCl (sodium chloride), there are 6.022 x 10²³ atoms of sodium and 6.022 x 10²³ atoms of chlorine, for a total of 12.044 x 10²³ atoms.

B. Cao(s) (Calcium oxide)

The balanced equation would be:

Ca(s) + O2(g) --> Cao(s)

It is the product of Calcium oxide.

The product of the reaction between sodium and chlorine is sodium chloride (NaCl). When sodium (Na) and chlorine (Cl) react, they form an ionic bond, with the sodium atom losing one electron to the chlorine atom. This forms a positively charged sodium ion (Na+) and a negatively charged chloride ion (Cl-), which are held together by electrostatic attraction to form the compound sodium chloride. It is a white crystalline solid and is commonly known as table salt.

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Synonyms of "Initiate" that belong to graphic organizer is given below.

1. To put into effect; bring into use.

• begin

• commence

• create

• launch

2. To take in as a member.

• admit

• pledge

• recruit

• welcome

A graphical organizer, also known as a knowledge map, concept map, story map, cognitive organizer, advanced organizer, or concept diagram, is an educational tool that uses visual symbols to represent knowledge and concepts through the relationships between them.

Graphic organizers help you visualize and build ideas, organize and order information, plan what to write, improve reading comprehension, brainstorm, organize problems and solutions, compare and contrast ideas, and show cause and effect. etc., can be supported.

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The mass in kilograms of 100 pills is equal to 0.0697 kilograms.

In Science, a conversion factor can be defined as a number that is typically used to convert (change) a number in one (1) set of units to another, either by dividing or multiplying.

Generally speaking, an appropriate conversion factor to an equal value must be used when it is necessary to perform any mathematical conversion.

Conversion:

1 pill = 697 milligrams.

100 pills = X milligrams.

Cross-multiplying, we have:

Mass of X in milligrams (mg) = 697 mg × 100 pills

Mass of X in milligrams (mg) = 69700 mg.

Next, we would convert the unit of mass in milligrams (mg) to kilograms (kg) by dividing it with a conversion factor of 1 × 10⁶ as follows;

Mass of X in kilograms (kg) = 69700/(1 × 10⁶)

Mass of X in kilograms (kg) = 0.0697 kilograms.

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Answer:

3,3 dihydroxy

Oh group attach with that benzene ring

Chemical reactions that release heat energy are called exothermic reactions. example:

C(g)+O2(g)→CO2(g)+thermal energy. A chemical reaction that absorbs heat energy is called an endothermic reaction. example:

CaCO3Heat→CaO+CO2.

A chemical reaction or physical change is endothermic when the system absorbs heat from the environment. In an endothermic process, the system gains heat from the environment and reduces the temperature of the environment.

A chemical reaction that releases energy is called exothermic. In an exothermic reaction, more energy is released in forming bonds within the products than is expended in breaking bonds within the reactants. Chemical reactions that absorb (or consume) energy are called endothermic.

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The mass of lead present in 6.0 × 10³ g if the lead content is 0.62 ppm is 0.0037 g of lead.

One part per million (ppm) concentration is equivalent to 1 milligram of a solute per liter of water (mg/l) or 1 milligram of something per kilogram soil (mg/kg).

The mass of lead present in 6.0 × 10³ g if the lead content is 0.62 ppm is calculated as follows:

Mass of lead  in blood = 0.62 * 1 mg/kg * 6.0 × 10³ g / 1000

Mass of lead in blood = 0.0037 g of lead

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Complete question:

The “normal” lead content in human blood is about 0.40 part per million (that is, 0.40 g of lead per million grams of blood). A value of 0.80 part per million (ppm) is considered to be dangerous. How many grams of lead are contained in 6.0 × 10³ g of blood (the amount in an average adult) if the lead content is 0.62 ppm?

As mentioned, 684 g of lead would've been needed to produce 119 g of water.

The mass of a material or substance tells us how much matter makes up that thing or substance. Despite the possibility of using grams to describe strength training, the kilowatt (kg) is the primary SI mass measurement (g). To measure mass, you might employ a balance. The amount of material an item contains is significantly influenced by its mass. A picture's gravity may be estimated based on its density. Along with its gravity, an element's location is crucial. This means that weight is still used to represent force.

(119 g H₂O) / (18.01532 g H₂O/mol) x (1 mol Pb / 2 mol H₂O) x (207.21 g Pb/mol) = 684 g Pb

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Voltage-gated calcium channels in the active zones of the synaptic terminal open when the membrane depolarizes and causes the release of synaptic vesicles.

The active zone of neurones is a  site on the motor nerve terminal of the neuron and  this site the synaptic vesicles fuse with the cell membrane of neurones for release the contents of the synaptic vesicle. The release of contents from synaptic vesicles are  through voltage-gated Calcium channels. This channels are opens when a membrane is depolarization for release of vasicles that are in synapse.

This channel also called Presynaptic Ca2+ channel and  calcium ion entry into the active zone  and this happens because of  voltage-gated Ca2+ channels are  activated when membrane depolarization occurred. and release neurotransmitter from synaptic vesicles.

Hence, option C is correct.

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There are two different kinds of food chains: the detrital food chain, which starts with dead organic matter, and the grazing food chain, which starts with autotrophs.

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3.2x10^23 atoms of MgO would have more number of moles as shown.

We know that the number of moles is a concept that we can be able to glean from Avogadro. The idea of mole has to do with the amount of substance that contains the same number elementary entities as what we have in carbon 12.

We have been told that we are to compare 0.2 moles of KI and then we also look at 3.2x10^23 atoms of MgO. We would then have to find the number of moles that we are going to have in the 3.2x10^23 atoms of MgO as we have written here.

If 1 mole contains 6.02 * 10^ 23 atoms

x moles would contain 3.2x102^3 atoms

x = 1 mole * 3.2x10^23 atoms/ 6.02 * 10^ 23 atoms

x = 0.53 moles

Hence the number of moles in the KI is less than that in the MgO.

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option (C) During the first 20 years, the population of deer increased.

In common parlance, a population is a distinct group of people who share a common citizenship, identity, or set of traits. A population is a sampling that is typical of a broader group of individuals (or even objects) that share one or more characteristics.

The entire group of organisms and the natural setting in which they live together make up an ecosystem. Through nutrient cycles and energy exchanges, these biotic and abiotic elements are interconnected. Through photosynthesis, energy enters the system and is absorbed into plant tissue.

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The mass of one mole of lead is 207.2 g and that of helium is just 4 g/mol. Therefore, a mole of lead weighs more than a mole of helium.

A mole is a unit of measurement that represents the amount of substance in a sample. One mole of any substance contains the same number of particles, which is known as Avogadro's number (6.022 x 10²³ particles per mole). Mass of one mole of an element is called its atomic mass.

The atomic  mass of lead is 207.2 g/mol, which means that one mole of lead has a mass of 207.2 grams. The atomic mass of helium is 4.0 g/mol, which means that one mole of helium has a mass of 4.0 grams.

Therefore, a mole of lead weighs more than a mole of helium, since the molar mass of lead is much greater than that of helium.

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Answer:

3.6106 g/mL (approx.)

Explanation:

Average density = Sum of all densities/ Number of Densities
Which is, (3.5512 + 3.4188 + 3.8617)/3
≈ 3.6106 g/mL

The number of gold atoms in 0.330 ounce, 18 K gold bracelet would be 2.12 x [tex]10^{22[/tex] atoms of gold.

1 ounce = 28 grams

0.330 ounce = 0.330 x 28 = 9.24 grams

18 K gold = 75% gold = 9.24 x 0.75 = 6.93 grams

In other words, a 0.330-ounce, 18 K gold bracelet contains 6.93 grams of actual gold.

Mole of 6.93 gold = 6.93/196.967 = 0.0352 mol

1 mole = 6.022 x [tex]10^{23[/tex] atoms

0.0352 mole = 0.0352 x 6.022 x [tex]10^{23[/tex]

                      = 2.12 x [tex]10^{22[/tex] atoms

In other words, a 0.330-ounce, 18 K gold bracelet contains 2.12 x [tex]10^{22[/tex] atoms of gold.

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The molar mass of the non-electrolyte solute is 285.7 g/mol.

The freezing point of cyclohexane is 6.6°C

The freezing point depression, ΔT, of hexane by the unknown non-electrolyte will be:

ΔT = 5.1  - 6.6

ΔT = 1.5 °C

Recall that ΔT = iKfm

where;

For the solution:

i = 1

Kf for cyclohexane = 20.2 deg⋅kg/mole of solute

m = ?

m = ΔT/iKf

m = 1.5/1 * 20.2

m = 0.07 molal

Molality = moles of solute/mass of solvent in kg

mass of solvent = 2.50 g or 0.0025 kg

moles of solute = 0.07 * 0.0025

moles of solute = 0.000175 moles

0.050 g of the non-electrolyte = 0.000175 moles

Molar mass of the non-electrolyte = 0.05/0.000175

Molar mass of the non-electrolyte = 285.7 g/mol

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Following are the scientific methods asked in question -

The scientific method, an empirical technique of learning, has governed the development of science from at least the 17th century (with notable practitioners in previous centuries; see the article history of scientific method for additional detail.)

It takes thorough observation and the use of strong skepticism regarding what is observed because one's perception of the observation may be influenced by cognitive presumptions. It entails creating hypotheses using induction based on these observations, testing the accuracy of those hypotheses using experimental and measurement-based statistical testing of the inferences drawn from them, and then adjusting (or discarding) those hypothese in light of the experimental findings.

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Answer:

The student's diagram is correct. The potential energy on the x-axis is increasing, and the potential energy on the y-axis is decreasing, which accurately displays an increase in energy (heat) being absorbed by the reaction. The value of X represents the energy of the reactants, while the value of Y represents the energy of the products. This indicates the reaction is endothermic, as the reactants have a lower energy than the products, meaning energy had to be absorbed from the environment in order to reach a stable state.

The bond between two amino acids is called a peptide bond.

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Potassium Phosphide reacts with aluminum in a single replacement reaction to produce Aluminum Phosphide and Potassium. The coefficient is needed in front of the product potassium to properly balance this chemical equation is 3. Therefore, option B is correct.

Potassium is the chemical element which is represented by the symbol K. Its atomic number is  19. Potassium metal reacts rapidly with atmospheric oxygen.

Potassium Phosphide reacts with aluminum in a single replacement reaction to produce Aluminum Phosphide and Potassium. The balance chemical equation is as follows:

2K₃PO₄ + Al₂(SO₄)₃ → 3K₂SO₄ + 2AlPO₄

Thus, option B is correct.

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Answer:

d. population growth.

Explanation:

Answer:

a. amount of algae on the glass

Explanation:

Physical and chemical circumstances are examples of abiotic elements, which are ecosystem components that are not alive. Because they are non-living and affect the ecosystem's characteristics, the rock composition, the quantity of algae on the glass, and the water temperature are all examples of abiotic elements in an aquarium environment.

Although the quantity of fish is a biotic element since it is a live organism and a component of the ecosystem.

The types of forces that are involved between the solute and solvent when forming a homogeneous solution between LiNO₃ and H₂O is ion-dipole forces dispersion forces dipole-dipole forces hydrogen bonding.

The relatively weak attractive forces that is acting on neutral atoms and other molecules as a result of the electric polarization induced in each particle by the presence of other particles. Forces like hydrogen bonding, dispersion forces, and dipole-dipole interactions are all examples of van der Waals forces.

Generally, the kinds of intermolecular forces that are involved in solution formation are dispersion forces, dipole-dipole forces, hydrogen bonding, and ion-dipole forces.

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Mass of NaNO3 should be dissolved in 400 g of water is 100 g

It is given that

Mass of water = 400 g

percent of solution = 20% solution

mass of NaNO3 = ?

Mass per cent is a way of expressing a concentration or describing the component in a particular mixture. The solution composition can be described in mass percentage which shows the mass of solute present in a given mass of solution. The quantity of solute is expressed in mass or by moles.

Mass percentage of solution = mass of solute/mass of solution

20% = mass of NaNO3/mass of NaNO3 + 400g

20/100 = x/x + 400

0.2(x + 400) = x

0.2x + 80 = x

0.8x = 80

x = 100 g

Hence, Mass of NaNO3 should be dissolved in 400 g of water is 100 g

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Answer:

in its neutral state an atom of Na has 11 electrons so when it loses an electron it becomes Na^+ with 10 electrons.

a neutral atom of Mg has 12 electrons by losing 2 elections it becomes Mg^2+ with 10 electrons

a neutral atom of oxygen has 8 electrons if it gains 2 electrons it becomes O^2- with 10 electrons

a neutral atom of Ne has 10 electrons

All of the above species in their excited states has 10 electrons (except for Ne which has 10 electrons in its neutral state) so they are all isoelectronic with Na^+

The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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If Sherman suggests that reproduction always creates individuals with adaptive traits, then he/she is not correct because variation may lead to non-adaptive phenotypes.

The presence of genetic variation in individuals of a given population is not adaptive per se, but instead, it provides the raw material for natural selection that leads to the differential survival and reproduction of the most adaptive phenotypes.

The genetic variation in individuals of a given population does not crate adaptive traits and it may derive from sexual reproduction.

Therefore, with this data, we can see that the presence of genetic variation in individuals of a given population may or not be adaptive in the function of the environment in which the individual produced by means of sexual reproduction is developed and therefore it is an advantage for the population but the individual may be harmful.

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Answer:

Para resolver este ejercicio debemos crear una relación entre la cantidad que necesita el paciente y la cantidad que tienen la pastilla del almacén. Transformamos 0.024 g, tenemos:

0.024 g = 24 mg

Ahora planteamos la relación, tenemos:

R = 24 mg/8mg

R = 3

Por tanto, se le debe dar al paciente 3 pastillas de 8 miligramos.

Nota: Tener en cuenta la homogeneidad de unidades.

The velocity of the prototype should be (Fr x √(g x (1:30L))).

Prototype is a preliminary version of a product or system that is used to test features, functionality, and design before a final version is released. It is a way to quickly and cheaply test ideas, evaluate feedback, and provide proof-of-concept for a product or system.

The Froude number for the model and prototype is given by the equation, Fr = V/√(gL), where V is the velocity, g is the acceleration due to gravity, and L is the length of the prototype. For the model, V is 1:30 times the velocity of the prototype.
Therefore, the velocity of the prototype, Vp, can be calculated as:
Vp = (Vm x 30)/1

= (Fr x √(gL)) x 30/1

= (Fr x √(g x (1:30L)))
Where Vm is the velocity of the model and L is the length of the prototype.
Therefore, the velocity of the prototype should be (Fr x √(g x (1:30L))).

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Answer:

hi there in this question. We are given the balanced equation for the reaction of water from hydrogen gas and oxygen gas. And the first thing we want to know is the mole ratio for this reaction. So we get the mole ratio from the coefficient in the balanced equation. And if there's not a coefficient written, it's understood that it's a one. So that means our mole ratio here is going to be two moles of hydrogen. Because coefficient is two Reacts with one mole of oxygen because its coefficient is one to produce two moles of the water. And we know it's a two because its coefficient as a two. Alright, so this would be the mole ratios for these, The hydrogen and oxygen react in a 2-1 ratio, producing two moles of the water. Alright, so now we want to sketch what's going to happen here if we start with six hydrogen molecules and the correct number of oxygen molecules. So our hydrogen molecules six of those remember their H two. So that would just be one hydrogen molecule that I just drew there. These are gasses. So they're going to be randomly spaced, moving around. There's three, there's 4. Here's five and six. All right, so, we know these react in a 2-1 ratio. So for every six of these We would only need half as many or three of the 02s. So here's one oxygen molecule. Again, this is a diatonic also. So each molecule is composed of two oxygen atoms. Alright, So we have that reacting with that. And when these combined we are going to get six water molecules and we know that because we started with six hydrogen and looking at our mole ratio for every two hydrogen that we start with, we can make to water. So if we start with six hydrogen We can make six water. So our oxygen molecules, the bonds between them were broken during this reaction and each one bonded 22 hydrogen apps. Because the bonds between the hydrogen molecules, we're also broken and we've rearranged to form six water molecules. Alright, so that would be our finished sketch showing the hydrogen. six molecules of the hydrogen Reacting with three molecules of the oxygen to produce six molecules of water. So these are reacting in that proper ratio of 2-1 22.

Explanation:

i hope this helped :)