radioactive isotope technetium-99m has a half-life of 6 hours. what fraction of a sample of technetium-99m remains after 24 hours? group of answer choices

The total grams of Fe2O3 are 49.2 g Fe2O3.

What is gramme?

The gramme is a unit of mass in the International System of Units (SI) that is equal to one thousandth of a kilogramme. It was originally known as the gramme.

The inorganic substance with the formula Fe2O3 is known as iron(III) oxide or ferric oxide. It is one of the three primary oxides of iron, the other two being the rare iron(II) oxide (FeO) and the naturally occurring iron(II,III) oxide (Fe3O4) found in the mineral magnetite. The primary iron source for the steel industry is Fe2O3, which is the mineral hematite. Acids easily penetrate Fe2O3. Rust is frequently referred to as Iron(III) oxide, and to some extent this term is helpful because of the similarities in composition and a number of its features; nevertheless, in chemistry, rust is a poorly defined substance that is defined as Hydrous ferric oxide.

? g Fe2O3 = 14.8 g O ×1 mol O/15.9994 g O×1 mol Fe2O3/3 mol O×159.69 g Fe2O3/1 mol Fe2O3

                 = 49.2 g Fe2O3

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The equations describing these laws are special cases of the ideal gas law, PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (universal) gas constant.

By rearranging the ideal gas law, P=n(RTV)=nconst, it can be demonstrated that the pressure of a sample of gas is directly proportional to the number of moles of gas present when volume and temperature are maintained constant. The common measurement of pressure is the pascal (Pa). The kilopascal is the most practical measure for measuring commonplace gas pressures since a pascal is a relatively tiny unit of pressure (kPa). There are 1000 pascals in a kilopascal. The atmosphere is yet another widely used pressure measurement unit (atm).

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There are eighteen electrons in the outermost shell of the Ge4+ ion in its ground state.

The electronic configuration shows that the last shell of germanium has four electrons and the d orbital has a total of ten electrons, but the ionic state of the element changes depending on the bond formation.

The germanium atom donates two electrons in the 4p orbital and two electrons in the 4s orbital to convert the germanium ion (Ge4+).

Ge – 4e– → Ge4+

The electronic configuration of the germanium ion (Ge4+) is:

1s2 2s2 2p6 3s2 3p6 3d10.

The electron configuration shows that the Ge4+ ion has three shells and the last shell has 18 electrons.

In other words, there are eighteen valence electrons in the germanium Ge4+ ion.

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True. Antioxidants are frequently added to foods that contain fat as preservatives to prevent or postpone the development of rancidity brought on by oxidation.

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The structure of a molecule like CH 2O (AX 3), whose double bond repels single bonds more potently than single bonds repel each other, is given below. As a result, the geometry is not perfect.

A molecule shape's actual bond angles can differ for a variety of reasons. The size of the participating atoms, the presence of lone pairs, numerous bonds, and big groups bound to the core atom

Since a lone pair of electrons requires more space than a bonding pair does, the molecular geometry is altered to provide the lone pair with more room, which leads to narrower bond angles than in the ideal geometry.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, the pressure of a tire at 25°C if the pressure is 1.5 atm when the temperature is 15°C is 1.55 atm.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.

Mathematically the relation between Pressure, temperature and volume can be given as

PV=nRT

Rearranging the equation we get

P₁÷T₁=P₂÷T₂

where,

P = pressure

T =temperature

R = Gas constant = 0.0821 L.atm/K.mol

Substituting all the given values, we get

P₁÷T₁=P₂÷T₂

1.5 ÷288=P₂÷298K

P₂=1.55 atm

Therefore, the pressure of a tire at 25°C if the pressure is 1.5 atm when the temperature is 15°C is 1.55 atm.

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If we compare the size of chlorine and phosphorous, along the period, size of the atom decreases.

So, size of chlorine is smaller thank the phosphorous.

Due to the smaller molecule size of chlorine with comparatively weaker van der Waals attractions, and so chlorine will have a lower melting and boiling point than phosphorus.

Whereas, Phosphorous has 4 atoms of phosphorous making it bigger in size than the molecule chlorine.

It has more number of electrons, hence stronger will be the  Van Der Waal's forces of attraction, so a higher melting point.

As higher energy will be needed to overcome these intermolecular forces.

Vander Waal forces of attraction  is the attraction of intermolecular forces between molecules.

There are two kinds of Van der Waals forces:

Weak London dispersion forces and

Stronger dipole-dipole forces.

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Answer: high temperatures

Explanation:

It varies.

The change in ph when 9.00 ml of 0.100 m HCl(aq) is added to 100.0 ml of a buffer solution that is 0.100 m in NH₃(aq) and 0.100 m in NH₄Cl(aq) is 0.0784

the change in pH can be calculate as follows

Calculate initial pH

Kb = 1.8*10⁻⁵

pKb = - log (Kb)

= - log(1.8*10⁻⁵)

= 4.745

pOH = pKb + log {[conjugate acid]/[base]}

= 4.745+ log {0.1/0.1}

= 4.745

PH = 14 - pOH

= 14 - 4.7447

= 9.2553

Calculate pH after adding HCl

mol of HCl added = 0.1M *9.0 mL = 0.9 mmol

NH₃ will react with H⁺ to form NH₄⁺

Before Reaction:

mol of NH₃ = 0.1 M *100.0 mL

mol of NH₃ = 10 mmol

mol of  NH₄⁺ = 0.1 M *100.0 mL

mol of NH₄+ = 10 mmol

after reaction,

mol of NH₃ = mol present initially - mol added

mmol of NH₃ = (10 - 0.9) mmol

mol of NH₃ = 9.1 mmol

mol of NH₄+ = mol present initially + mol added

mol of NH₄+ = (10 + 0.9) mmol

mol of NH₄+ = 10.9 mmol

since volume is both in numerator and denominator, we can use mol instead of concentration

Kb = 1.8*10⁻⁵

pKb = - log (Kb)

= - log(1.8*10⁻⁵)

= 4.745

After the reaction, the following equation holds true:

mol of NH₃ = mol present initially - mol added

mol of NH₃ = (10 - 0.9)

mol of NH₃ = 9.1 mmol

mol of NH₄+ = mol present initially + mol added

mol of NH₄+= (10 + 0.9)

Since volume appears in both the numerator and denominator of the equation, we can use mol in place of concentration:

mmol of NH₄⁺ = 10.9 mmol

Kb = 1.8*10⁻⁵ pKb = -log(Kb) = -log(1.8*10⁻⁵) = 4.745

pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [10.9/9.1] = 4.823

pH = 14 - pOH = 14 - 4.8231 = 9.1769

The reaction between NH₄+ and OH⁻ will produce NH₃ when mol of NaOH supplied is 0.1M *9.0 mL = 0.9 mmol.

NH₃ = 0.1 M * 100.0 mL mol of NH₃ = 10 mmol NH₄+ = 0.1 M * 100.0 mL mol of NH₄⁺ = 10 mmol

After reaction, the equation is:

Mol of NH₃ = Mol originally present + Mol of NH₃ added = (10 + 0.9).

mol of NH₃ = 10.9 mmol

mol of NH₄⁺ = mol initially present - mol added

mol of NH₄⁺ = (10 - 0.9)

Since volume is in both the numerator and the denominator

mol of NH₄⁺ = 9.1 mmol,

we can substitute mol for concentration.

Kb = 1.8*10⁻⁵

pKb = -log(Kb) = -log(1.8*10⁻⁵) = 4.745

Make use of:

pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [9.1/10.9] = 4.666

occupy:

pH = 14 - pOH = 14 - 4.6663 = 9.3337

pH = final pH - initial pH

= 9.3337 - 9.2553

= 0.0784

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The balanced chemical equation:

2VO + 3fe2O₃ → V2O₅ + 6FeO

What is balanced chemical reaction?

A chemical equation is said to be balanced if the same amount of atoms of each type are involved in the reaction on both the reactant and product sides. A chemical equation that is in balance will have an equal amount of mass and change.

On the left and right sides of the reaction arrow in a balanced equation, the same number of each type of atom is present. The products go on the right side of the arrow when writing a balanced equation, and the reactants go on the left.

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In 1 ounce of soda, there are 1.17 sugar grams. if 14 grams of sugar are present in a 12-ounce a can soda

A bunch of items are divided into equal portions using the division method. Multiplications are the exact opposite of divisions. For instance, dividing by two (20) means dividing it into two (10-piece) equal groups. The inverse of multiplication is division. When you multiply three groups of four to produce twelve, you get four in each group when you split twelve into three equal groups.

In light of this, a 12-ounce a can Coke has 14 sugar grams.

Considering that, a 12-ounce soda can has 14 sugar grams. So, 1 ounce of soda has 14/12 = 1.17 grams of soda.

As a result, 1.17 sugar grams are present in 1 ounce of soda.

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According to the electromagnetic spectrum and the E= hcυ , the frequency of light is 3.77×10²⁶ s[tex]^-1[/tex] and wavelength of light is 26.5×10[tex]^-[/tex][tex]^28[/tex] m.

The electromagnetic spectrum consists of electromagnetic radiation  which consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In  the given problem, frequency of light is calculated as, υ=E/hc which is υ=75.1/6.626×10[tex]^-[/tex]³⁴×3×10⁸=3.77×10²⁶ per second and as wavelength is reciprocal of frequency that is λ=1/υ=1/3.77×10²⁶=26.5×10[tex]^-28[/tex] m.

Thus the frequency and wavelength of light is 3.77×10²⁶ per second and 26.5×10[tex]^-28[/tex] m respectively.

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Covalent bonds are made by sharing of electrons to complete the octet or doublet of the atom to attain stability.

Covalent bond refers to the mutual sharing of one or more pairs of electrons between two atoms.

These electrons simultaneously attract the atomic nuclei of the two atoms participating in the covalent bond.

A covalent bond is formed only when the electronegativity difference of two atoms is too small so that an electron transfer to form ions will not occur.

Number of bonds for a neutral atom = (Number of electrons in the complete valence shell i.e. 2 or 8 electrons) - (Number of valence electrons of the atom)

for example:

Number of bonds for a neutral carbon = (Number of electrons in the complete valence shell i.e. 2 or 8 electrons) - (Number of valence electrons of the carbon)

which means,

Number of bonds for carbon atom = 8 - 4

Number of bonds for carbon atom = 4

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The spectrum produced by a 1-gram sample of element z would have the same spectral lines at the same wavelengths as the spectrum produced by a 2-gram sample of element z because the position of the spectral lines does not depend on the amount of mass. but of the type of atom or molecule that produces them.

They are dark or bright lines in a uniform and continuous spectrum, the result of an excess or deficiency of photons in a narrow range of frequencies, compared to other nearby frequencies.

Due to the intrinsic property that each atom has to emit a single spectral line, these lines have been very useful to identify the chemical composition of any medium that allows light to pass through it.

The spectral lines also depend on the physical conditions of the gas, hence they are used to determine the physical characteristics and chemical composition of stars and other celestial bodies, for which there is no other method of analysis.

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There are two unpaired electrons present in the ground state of the atoms in group 4A(14) in the periodic table.

Electronic configuration explains the arrangement of the electrons in each subshell and each orbital of an atom. The general electronic configuration of group 4A elements is written as ns2np2. The total number of valence electrons in group 4A elements is four. Two electrons are present in s-orbital which is paired and two electrons are present in p-orbital which is unpaired. Therefore, the number of unpaired electrons present in the ground state of the atoms in Group 4A(14) is two. The electrons cannot be in the same orbital because of Hund's Rule which states that in a set of degenerate orbitals.

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In the periodic table, we notice that elements move up or down a column, they are grouped together into groupings with comparable chemical properties.

The periodic table is reflected in the patterns and trends in its rows and columns. Elements are grouped together into groups that have similar chemical characteristics as they move up or down a column. The atoms trend smaller or larger in size, and their reactivities fluctuate left to right within a row.

Beyond periods and groups, the periodic table divides elements into four groups called blocks: the s block, the p block, the d block, and the f block. These groups provide more information about the arrangement of the electrons, who their likely neighbors are in the table, and which electrons are their valence electrons.

So, Elements are grouped together into groups with similar chemical properties as they progress up or down a column.

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Calcium chloride is widely used to melt the ice on the sidewalks because it has a lower freezing point.

The mixture of calcium chloride and water is used to melt the ice on the roads in countries with extremely cold climates. Eutectic mixture is the name given to the calcium chloride (CaCl₂) and water combination.

Compared to sodium chloride, this combination has a much lower freezing point which makes it less preferable.

Although sodium chloride (NaCl) has a far greater freezing point than calcium chloride, it is still an excellent alternative for melting ice.

Because it makes cleaning the roadways simpler, calcium chloride is always preferable to sodium chloride.

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A precipitate will form when 20.0 ml of 0.10 m ba(no3)2(aq) and 50.0 ml of 0.10 m na2co3 (aq) are mixed together.

What is a precipitate?

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For the plant, it can be too hot or too cold. Water is not required by the plant. Carbon dioxide is not necessary for the plant. In order to photosynthesize their food, plants first utilize CO2, but they also use oxygen.

What is photosynthesis?

The plant can produce its own sugar and has access to sunlight. The plant can produce its own sugar and has access to sunlight. But the plant is starting to wither. The process by which plants convert carbon dioxide, water, and sunshine into oxygen and sugar-based energy is known as photosynthesis. Once they have carbon dioxide and water, they can use solar energy to create food. Another gas called oxygen is a byproduct of the production of plant nourishment. The leaves emit this oxygen into the atmosphere.

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The potential energy of water is decreased when water molecules when they freeze and become solid ice.

Because molecules have energy, they move constantly. Water molecules move more quickly and are essentially in continuous interaction with one another when they are in a liquid state instead of to a solid state.

The potential energy of the liquid decreases as it cools, which causes the molecules to start moving more slowly. The molecules of water bind together at a temperature of about 0°C to produce ice.

Intermolecular hydrogen bonds keep water molecules together, make it a liquid.

Hence, When water molecules freeze and turn into solid ice, their potential energy decreases.

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When compared to H+/H, a positive result for Cu2+/Cu implies that the reduction occurs more quickly. It is a stronger oxidising agent as a result.

It also implies that Cu is unable to convert acidic H+ ions to H2 using this process. A species' propensity to gain electrons and become reduced is known as its reduction potential. It is expressed in volts or millivolts. Greater reduction potential is indicated by larger positive reduction potential readings. High enthalpy of atomization and low enthalpy of hydration characterise copper. Because the considerable energy required to convert Cu(s) to Cu(aq)2+ is not offset by hydration enthalpy, the value of E(Cu2+/Cu) is unusually positive. Cu2+ has a typical reduction potential of +0.34 For instance, Cu2+ possesses a positive charge and has lost two electrons. oxidise to bring about the loss of electrons in an atom or group of atoms during a chemical process.

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Here is the classification of each compound:

Acid is a substance that, in an aqueous solution, is ionized and gives  H⁺ ions when dissociates. Strong acids are substances that are completely ionized in solution, while weak acids are only partially ionized.

Base is a substance that, in an aqueous solution, is ionized and gives OH⁻ ions when dissociates. Strong bases are completely ionized, while weak bases are only partially ionized.

Since weak acids and weak bases don't go 100% to completion, their reactions are reversible reactions (written using ⇄ symbols instead of the usual arrow).

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Answer:

The closer the transition state to the product, the more stable it is. It is because this transition state is closest to the final form of the product, which is usually stable

Answer:

Explanation: The best-supported theory of our universe's origin centers on an event known as the big bang. This theory was born of the observation that other galaxies are moving away from our own at great speed in all directions as if they had all been propelled by an ancient explosive force.

Answer:

Answer: 93.54%Explanation: Divide the mass of the zinc by the total mass of the penny. 2.9/3.1=0.9354To get to a percent, multiply by 100.

Explanation:

93.54% of zinc in the penny when a penny has a total mass of 3.1 grams and zinc makes up 2.9 g of the penny.

What is mass?

Mass is simply the measure of the amount of matter in a body.

Divide the mass of the zinc by the total mass of the penny.

=0.9354

To get to a percent, multiply by 100.

0.9354 x 100 = 93.54

Thus, the mass of the zinc in the penny is 93.54%.

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Chlorine is a non-polar bond. An example of a non-polar bond is the bond in chlorine.

Chlorine contains two chlorine atoms. The electrons are shared equally because the electronegativity difference between the two atoms is zero.

When two atoms share electrons evenly, a type of chemical bond known as a non-polar covalent link is created. The number of electrons shared by the neighboring atoms in an atom will therefore be equal. Because of the largest minor difference in electronegativity, the covalent bond is also referred to as nonpolar.

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The concentration of the sodium hydroxide solution after titration is 0.816M.

Calculate the concentration of the base by using the equation for neutralization reaction.

n₁M₁V₁ = n₂M₂V₂

Where,

n₁, M₁ and V₁ are the are the n-factor, molarity and volume of acid (H₃PO₄).

n₂, M₂ and V₂ are the n-factor, molarity and volume of base (NaOH).

Given,

n₁ = 3

M₁ = 0.220 M

V₁ = 24 mL

n₂ = 1

M₂ = ?

V₂ = 19.4 mL

Substituting the values we get,

n₁M₁V₁ = n₂M₂V₂

⇒ 3 × 0.22 × 24 = 1 × M₂ × 19.4

⇒ M₂ = (3 × 0.22 × 24) / 19.4

⇒ M₂ = 0.816 mL

Hence, the value of the concentration of the base is 0.816 mL.

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