if a compounds of calcium oxide has a mass of 5.45 g what would be the number of moles for this mass? (round to the fourth decimal place)

She test this idea in the Flowing Water Model through integrated water flow model

Flowing water model is the computer programmed for simulating water flow through the integrated land surface water and groundwater flow systems and hydroelectric energy is power made by the moving water and water always flow downhills because of gravity and she She test this idea in the Flowing Water Model through integrated water flow model

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The Bohr model is a representation of the electronic configuration of the atom. According to this model, each energy level can hold a certain number of electrons. In the first energy there can only be 2 electrons, in the second and the following energy levels there can be a maximum of 8 electrons.

Sodium, Na which has 11 electrons in total so in the first level it will have two electrons, in the second level it will have 8 electrons and in the third level it will have the missing electron.

In the model proposed by the student, the electrons are represented in blue. The model proposed by the student is incorrect.

We see that in the second energy level he drew 9 electrons, this is incorrect since from the second energy level there can only be 8 electrons, the remaining electron must be located in the third energy level.

Answer:

A given mass of liquid has a fixed volume at room temperature.

Explanation:

260grams

The formula for calculating the moles of NaOH is expressed as

Determine the required mass of NaOH

Hence the grams of sodium hydroxide (NaOH) you need to make 6.5 L of 1.0M solution is 260grams

Total number of electron-pair domains (electron clouds) around the central atom in the sulfurtetrafluoride molecule is five. which includes 4 bond pair 1 loan pair.

An atom's electron domain is the number of lone pairs or chemical bond locations that surround it. It represents the number of locations expected to contain electrons. By knowing the electron domain of each atom in a molecule, you can predict its geometry.

“The electron geometry describes the spatial arrangement of a molecule’s bonds and lone pairs. VSEPR theory can be used to calculate electron geometry.”

The term electron geometry is the name of the electron pair/groups/domains on the central atom, whether they are bonding electrons or non-bonding electrons. Electron pairs are electrons that exist in pairs or bonds, as lone pairs or as a single unpaired electron. Because electrons are always in motion and their paths cannot be precisely defined, the electron arrangement in a molecule is described in terms of an electron density distribution.

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Melting point, density, color,  are measurable physical properties.

A physical property is a characteristic that may be observed or quantified without changing the composition. Density is another illustration of a physical characteristic. Your coin is still composed of the same material as it was before it was dropped into the fountain, despite the fact that it may be a little moist. Additional examples of physical attributes are color, mass, smell, boiling point, volume, and temperature.

Some physical qualities, such density and color, may be detected without changing the physical state of the item being studied. Only when matter undergoes a physical transition can other physical properties, like the melting point of iron or the freezing point of water, be seen.

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Explanation:

To find the isotope that is expected to be radioactive we have to compare the given isotopes with the ones that we find the in the periodic table.

(A) Ti:

Isotope ----> atomic mass = 48 atomic number = 22

Periodic table ---> average atomic mass = 47.9 atomic number = 22

(B) Sr:

Isotope ----> atomic mass = 88 atomic number = 38

Periodic table ---> average atomic mass = 87.6 atomic number = 38

(C) Os:

Isotope ----> atomic mass = 192 atomic number = 76

Periodic table ---> average atomic mass = 190.2 atomic number = 76

(D) Pu:

Isotope ----> atomic mass = 244 atomic number = 94

Periodic table ---> average atomic mass = 244 atomic number = 94

If we take a look at them we will see that the only one that is different is osmium. The atomic mass of the isotope is 192 amu, that means that this isotope has 2 more neutrons than the average atom of the element. So we can expect that it could be radioactive.

Answer: C. Os

When a candle is lit, a combustion reaction takes place that releases heat, this heat causes the temperature of the candle to increase and the state of the candle to be liquid. Molecules move due to heat.

When the candle blown out, the temperature begins to decrease and the liquid wax begins to solidify because the molecules move slower and slower. Therefore, the spaces of the obtained can be filled in the following way:

When the candle was blown out the wax solidifies because the molecules have low energy and moved slower.

Answer:

Hydrogen is a Cation, the only cation that has no electrons.

¿Is hydrogen Anion or Cation

A Hydrogen, it is well known that it is a Cation, since it is a positively charged particle.

A Hydrogen is a chemical element, which is the lightest that exists, its atom is made up of a proton and an electron and it is stable in the form of a diatomic molecule (H2).

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Answer:

Joules/sec and watts.

Explanation:

1 Joule/sec is a rate of energy expending every second.  It is equal to a watt, the English term.

Answer:

Fe

Iron – Ferrum (Fe)

Iron's Latin name, 'ferrum', gives it its symbol Fe; it simply means 'iron' or 'sword', and is possibly of Semitic origin.

Liquids have characteristics that fall somewhere in between those of solids and gases, yet they resemble solids more. Intermolecular forces, as opposed to intramolecular forces, such as the covalent bonds that bind atoms in molecules and polyatomic ions, keep molecules in a liquid or solid together. In comparison to covalent bonds, intermolecular forces are often significantly weaker. For instance, in 1 mol of water, the intramolecular forces must be overcome in order to break both O-H bonds, while the intermolecular forces must be overcome in order to turn 1 mol of liquid water into water vapor at 100 °C, which needs just around 41 kJ. (Despite this figure appearing to be modest, the intermolecular forces in liquid water are some of the highest intermolecular forces ever measured.

Copper(II) sulfate.

Before we name the given compound, we need to know what chemical compounds are. Chemical compounds are chemical substances composed of molecules formed from atoms of an element and held together by a chemical bond.

Given the chemical compound CuSO4, this compound contains copper, sulfur, and oxygen element.

The molecular compound CuSO4 is named with the first element first and then the second element by using the stem of the element name plus the suffix -ate

The compound name for CuSo4 will therefore be Copper(II) sulfate. The roman numeral of (II) comes from the sum of the oxidation state of the element.

Note that the oxygen atoms have a -2 oxidation number, and sulfur has a +6, oxidation number to have (4 * -2) + 6 = -2. This makes copper have an oxidation number of +2.

The reaction of silver nitrate with copper is a substitution reaction. We have copper in its free state, Cu, and we have silver nitrate which has the formula AgNO3. The copper replaces the silver obtaining the following reaction:

The products obtained are copper nitrate and silver.

The word equation will be:

Answer

Calcium - 40 is the most stable and most likely to be found occurring naturally

Explanation

Nuclear stability means that the nucleus of the element is stable enough to not decay with the passing of time, this decay is known as radioactivity. When it comes to Calcium, we have many isotopes of this element, but only a few have such a long half-life that we can consider them to be stable, and Calcium - 40 is the most stable and common of them.

Answer: 2.1M

Explanation:

   Hence, the molarity of a solution of ethanol in water is 2.1M.

Answer:

B: ionization energy

Explanation:

Answer:

question 1:

answered previously

question 2:

a= 50% chance tall daughter

b= 50% chance short daughter

question 3:

a= 75% chance of not having cystic fibrosis

b= 25% chance of having cystic fibrosis

question 3:

Explanation:

question 2:

the question specified on the offspring being female so when stating the gametes we must include the XX chromosomes for the female and XY chromosome for the male.

let us denote that:

T = tall gene

t = short gene

Father 》 Mother

parental phenotype: Short 》 tall

parental genotype: XtYt 》 XTXt

parental gametes: (Xt) (Yt) 》 (XT) (Xt)

random fertilization:

Xt Yt

XT XTXt XTYt

Xt XtXt XtYt

F1 generation sex: Male 》Female

F1 chromosomes: XY 》 XX

F1 gen phenotype: Tall 》 Tall

F1 gen genotype: Tt, tt 》 Tt, tt

ratio: 2 : 2 or 1 : 1

percentage gender: 50% 》 50%

percentage tall: 50% 》 50%

question 3:

denoting:

N = normal (dominant)

c= cystic fibrosis (recessive)

parental phenotype: Normal 》Normal

parental genotype: Nc 》 Nc

random fertilization:

N c

N NN Nc

c Nc cc

F1 gen phenotype: Normal 》 Cystic fibrosis

F1 gen genotype: NN, Nc, Nc 》 cc

ratio: 3 : 1

percentage: 75% 》 25%

(if you have anymore questions on the topic let me know)

Answer:

You can find p-block elements on the periodic table in groups 13 to 18, you can find the s-block on the periodic table in group 1, Group 3 through Group 12 are d-block elements, and The f-block elements, found in the two rows at the bottom of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.

Explanation:

Hope this helps!

The equation below shows hydrogen reacting with oxygen to produce water 2H₂ + O₂ → 2H₂O If 16 mole of oxygen were reacted with excess hydrogen gas, then 32 mole of water would be produced

Mole is the amount of substance of a system which contains as many elementary entities

Here given data is

Hydrogen reacting with oxygen to produce water and the reaction is

2H₂ + O₂ → 2H₂O

16 mol of oxygen were reacted with excess hydrogen gas

Then we have to calculate moles of water would be produced = ?

Moles of oxygen = 16 moles

From the balanced equation

1 mole oxygen react to give 2 moles of water

16 moles oxygen react to give 2×16 = 32 moles

Therefore 32 moles of water would be produced in the reaction

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d. 32 mol in case you dont want to read that

Answer: D

Explanation:

The formula NaO,CaO represents one ionic compound and one covalent compound.

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1.7 grams are there in 0.10 moles of OH ions.

The mole is a unit of measurement or the starting point for determining the concentration of a chemical in a sample. Avogadro's constant, or 1 mole, is a quantity that is equal to 6.022 × 10²³ particles. Any species, such as atoms, molecules, electrons, protons, neutrons, etc., can make up.

Number of moles = Mass/ Molecular mass

Given, number of moles = 0.10

Molecular mass of OH = 17 g/mol

∴ Mass = Number of moles × Molecular mass

  Mass = 0.10 × 17

  Mass = 1.7 grams

Therefore, 1.7 grams are there in 0.10 moles of OH ions.

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In these given options, flooding is most likely to reduced human population.

Therefore, the infrastructure in our environment and the ecosystem itself may be harmed by severe flooding. They can first demolish houses and render them inhabitable. Additionally, they can clear farms of sand, which makes it harder to cultivate crops. In addition to the aforementioned, flooding taints clean water, resulting in illnesses.

Limiting variables prevent populations from growing either through increased death rates or emigration, decreased birthrates or immigration, or a combination of these factors.

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Answer:

Explanation:

Here, we want to get the chemical formula for the compound

From what we have, the compound contains hydrogen and carbon only

We also were given that the molar mass is 28.06 amu

Now,we beed to get the individual atomic mass of carbon and hydrogen

From records, carbon has an AMU of 12.01

The AMU of hydrogen is 1.00794

Looking at the total value, we can see that the max possible number of atoms of carbon present is 2

Now, we need to know the number of hydrogen atoms

Let us call this n

Mathematically, we know that the AMU of the compound is the sum of the AMU of the individual atoms

Hence, we have it that:

Finally, we want to write the molecular formula of the compound

The molecular formula is written with carbon first, followed by its number of atoms as subscript, then hydrogen , with its number of atoms as subscript

We have this written as:

Answer:

Beta radiation

Explanation:

we know the three types of nuclear radiation:

okay so first look at the mass number of both the product and reactant, we notice that the mass number for both remains 35.

immediately we can cross of the possibility of it being alpha radiation because an alpha particle is similar to that of helium nucleus, hence if it was alpha, the mass number of Cl would be 4 less.

now look at the atomic number, we notice that moving from S to Cl it increased by 1 which can only mean it was beta radiation.

Beta radiation is when a neutron inside to nucleus turns into a proton and an electron, the electron is ejected from the nucleus hence it's a high speed electron.

neutron --> proton + electron

the reason the mass number is the same is because a neutron and proton has a mass of 1 whilst the electron is too small to cause much change.

the reason for nuclear decay is mainly because the elements want to achieve more stability.

Answer: a

Explanation:

Answer: A. The population is growing rapidly