Universe L, recently discovered by an intrepid team of chemists who also happen to have studied interdimensional travel, quantum mechanics works just as it does in our universe, except that there are seven d orbitals instead of the usual number we observe here. Use these facts to write the ground-state electron configurations of the sixth and seventh elements in the first transition series in Universe L.

Answer:

When the molten outer core cools and becomes solid, a very long time in the future, the Earth's magnetic field and atmosphere will disappear.

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the magnetic field will vanish a very lot longer after the liquid outer core solidifies and cools.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. The magnetic field or atmosphere will vanish a very lot longer after the liquid outer core solidifies and cools.

Therefore, the magnetic field or atmosphere will vanish a very lot longer after the liquid outer core solidifies and cools.

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Answer:

negative

Explanation:

18 negative

19 neutral

10 positive

there are are more negative

Answer: 101 moles of oxygen are contained in the tank

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 204.047  atm

V = Volume of gas = 12.0 L

n = number of moles  = ?

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]22.0^0C=(22.0+273)K=295K[/tex]

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{204.047atm\times 12.0L}{0.0821 L atm/K mol\times 295K}=101moles[/tex]

Thus 101 moles of oxygen are contained in the tank

Answer:

B. Electrons

Explanation:

Answer:

pH

Explanation:

We define the pH of a solution as the negative logarithm of hydronium ions concentration in solution.

Thus when we want to define pH mathematically, we write;

pH = - log {H3O^+]

Where;

{H3O^+] means the concentration of hydronium ions in solution.

1.14m x MG is the answer

Answer:

Electrons

Explanation:

Answer:

11460 years

Explanation:

0.693/t1/2 = 2.303/t log (No/N)

t1/2 = half life of the carbon

t = age of the fossil

No= amount of radioactive material originally present

N= amount of radioactive material present at time=t

No= mass of carbon + nitrogen = 5g

0.693/5730 = 2.303/t log (5/1.25)

1.21 ×10^-4 = 1.3866/t

t= 1.3866/1.21 ×10^-4

t= 11460 years

Answer:

0.10L of 1.00M of H₃PO₄ and 0.1613L of 1.00M NaOH

Explanation:

The pKa's of phosphoric acid are:

H₃PO₄/H₂PO₄⁻ = 2.1

H₂PO₄⁻/HPO₄²⁻ = 7.2

HPO₄²⁻/PO₄³⁻ = 12.0

To make a buffer with pH 9.40 we need to convert all H₃PO₄ to H₂PO₄⁻ and an amount of H₂PO₄⁻ to HPO₄²⁻

To have a 50mM solution of phosphoures we need:

2L * (0.050mol / L) = 0.10 moles of H₃PO₄

0.10 mol * (1L / mol) = 0.10L of 1.00M of H3PO4

To convert the H₃PO₄ to H₂PO₄⁻ and to HPO₄²⁻ must be added NaOH, thus:

H₃PO₄ + NaOH → H₂PO₄⁻ + H₂O + Na⁺

H₂PO₄⁻ + NaOH → HPO₄²⁻ + H₂O + Na⁺

Using H-H equation we can find the amount of NaOH added:

pH = pKa + log [A⁻] / [HA] (1)

Where [A-] is conjugate base, HPO₄²⁻ and [HA] is weak acid, H₂PO₄⁻

pH = 7.40

pKa = 7.20

[A-] + [HA] = 0.10moles (2)

Replacing (2) in (1):

7.40 = 7.20 + log 0.10mol - [HA] / [HA]

0.2 = log 0.10mol - [HA] / [HA]

1.5849 = 0.10mol - [HA] / [HA]

1.5849 [HA] = 0.10mol - [HA]

2.5849[HA] = 0.10mol

[HA] = 0.0387 moles = H₂PO₄⁻ moles

That means moles of HPO₄²⁻ are 0.10mol - 0.0387moles = 0.0613 moles

The moles of NaOH needed to convert all H₃PO₄ in H₂PO₄⁻ are 0.10 moles

And moles needed to obtain 0.0613 moles of HPO₄²⁻ are 0.0613 moles

Total moles of NaOH are 0.1613moles * (1L / 1mol) = 0.1613L of 1.00M NaOH

Then, you need to dilute both solutions to 2.00L with distilled water.

The question is incomplete, the complete question is;

Britney found an irregularly shaped metal object on the beach that

has a mass of 232.5 grams. To determine the volume, she partially

filled a cylindrical water bottle and dropped the object in. The

water level in the bottle rose by 1.2 cm. The bottle has a diameter

of 5 cm. Calculate the density of the metal to determine what type

of metal Britney found. Densities, measured in grams per cubic

centimeter, g

cm3

, for some common metals are listed.

• Copper: 8.86 g

cm3

• Bronze: 9.87 g

cm3

• Silver: 10.5 g

cm3

• Gold: 19.3 g

cm3

Select the word that correctly completes the sentence.

Based on the density of the metal, it is most likely that the metal Britney

found is _______________.

\ copper

\ bronze

\ silver

\ gold

Answer:

Bronze: 9.87 g

bronze

Explanation:

We know that the volume of the liquid = the volume of the object

This is because the object will cause the liquid to occupy its own volume of the container.

Now; area of the container = πr^2 = 3.142 * (5/2)^2 = 19.635 cm^2

Volume of the liquid = volume of the sold = 19.635 cm^2 * 1.2 cm= 23.562cm^3

Now given that;

Density = mass/volume = 232.5 g/23.562cm^3 = 9.87 g/cm^3

Answer:

178.35g

Explanation:

Molarity of a solution can be calculated using the formula:

Molarity = number of moles ÷ volume

Based on the information provided in this question, molarity (M) of the solution = 1.50 M, volume = 725 mL = 725/1000 = 0.725L, n = ?

1.50 = n / 0.725

n = 1.50 × 0.725

n = 1.0875mol

Molar mass of Na3PO4

23(3) + 31 + 16(4)

= 69 + 31 + 64

= 164g/mol

Mole = mass ÷ molar mass

1.0875 = mass/164

mass = 178.35g

Answer:

meth

Explanation:

YOu get chemicals and mix them together yes you do

Firework mixture is made up with potassium nitrate and other toxic chemicals. They produce harmful wastes to the atmosphere. If they are contaminated, they make release very dangerous explosives by unwanted reactions.

Explosives are chemicals releasing lot of heat energy to the surrounding upon  decomposition. Nitrogen compounds, hydrogen etc are explosive and they will explode in air or water.

Chemicals have to handled carefully and stored as per the conditions based on their chemical and physical properties. Some of them may easily corrode. Some may rapidly reacts with water or air and some may explode in air.

Explosive chemicals causes atmospheric pollution as well as health risk by releasing hazardous chemicals. If they are contaminated then there may occur some unwanted reaction and it will make the risk intense by producing toxic gases.

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Answer:

They are the same.

Explanation:

Hello!

In this case, according to the Avogadro's number, we take into account that for molecules such as gaseous oxygen (O₂) and nitrogen (N₂), we realize that 1 mole of these contain 6.022x10²³ moles of molecules; as we are given  1 mol each, we notice they both have 6.022x10²³ molecules, therefore, they number of molecules is the same because they have the same number of moles.

Best regards!

Answer:

No sound Is not matter Sound and light are not considered matter and was never matter

Explanation:

Hope this hope helps

Answer:

The protic solvents are (CH3)2CHOH, NH3, and HCONH2

The aprotic solvent are CH3NO2, CH2Cl2, and N(CH3)3

Explanation:

A protic solvent is a solvent that has a hydrogen atom bound to an oxygen (O), a nitrogen (N), or fluoride (F). Generally, any solvent that contains a labile H⁺ is called a protic solvent.

a. (CH3)2CHOH

(CH3)2CHOH is a protic solvent because one of the hydrogens is bound to oxygen (O)

b. CH3NO2

CH3NO2 is an aprotic (i.e not a protic solvent) solvent because all the hydrogens are bound to carbon.

c. CH2Cl2

CH2Cl2 is an aprotic solvent because all the hydrogens are bound to carbon.

d. NH3 is a protic solvent because all the hydrogens are bound to Nitrogen (N)

e. N(CH3)3 is an aprotic solvent because all the hydrogens are bound to carbon

f. HCONH2 is a protic solvent because two of the hydrogens are bound to Nitrogen (N)

Answer:

A. hamper

Explanation:

i did this question before.

Answer:

Improve

Explanation:

They improved Washington's rank so that he could rise to the top.

Answer:

is always exothermic

Explanation:

You see, whether a process is endothermic or exothermic depends on the result of the operation; ΔHreaction= ΔHproducts - ΔHreactants.

If the enthalpy of reactants exceeds that of the products, then the process is exothermic.

We should remember that the energy of isolated atoms is always higher than the energy of the compound formed when the atoms bond together. Hence bond making is an exothermic process.

Energy is used to form bonds and released when they are broken, bond-breaking is considered to be endothermic. Additionally, the creation of bonds is typically an exothermic process. The formation of chemical bonds from separated atoms is exothermic. The correct option is 4.

When bonds are created in the products of exothermic processes, more energy is produced than is required to break the bonds between the reactants. The temperature of the reaction mixture rises as a result of exothermic reactions. Endothermic chemical processes are those that generally absorb (or use) energy.

An attraction between atoms or ions is referred to as a chemical bond. Atoms trade or exchange valence electrons to create bonds.

Thus the correct option is 4.

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Answer:

69.79

Explanation:

According to this question, Gallium element (Ga) has two isotopes namely: 69Ga and 71Ga respectively.

- Isotope 69Ga contains a percent abundance of 60.11 %, the decimal abundance= 0.6011

- Isotope 71Ga contains a percent abundance of 39.89 %, the decimal abundance = 0.3989

Atomic mass of Ga = (mass of isotope 1 × decimal abundance) + (mass of isotope 2 × decimal abundance)

Atomic mass of Ga = (0.6011 × 69) + (0.3989 × 71)

Atomic mass of Ga = 41.4759 + 28.3219

Atomic mass of Ga = 69.797

Atomic mass of Gallium = 69.79

Answer:

801 g

Explanation:

From the question given above, the following data were obtained:

Number of mole of Ba₃(PO₄)₂ = 1.33 moles

Mass of Ba₃(PO₄)₂ =?

Next, we shall determine the molar mass of Ba₃(PO₄)₂. This can be obtained as follow:

Molar mass of Ba₃(PO₄)₂ = (137.3×3) + 2[31 + (4×16)]

= 411.9 + 2[31 + 64]

= 411.9 + 2[95]

= 411.9 + 190

Molar mass of Ba₃(PO₄)₂ = 601.9 g/mol

Finally, we shall determine the mass of Ba₃(PO₄)₂. This can be obtained as follow:

Number of mole of Ba₃(PO₄)₂ = 1.33 moles

Molar mass of Ba₃(PO₄)₂ = 601.9 g/mol

Mass of Ba₃(PO₄)₂ =?

Mole = mass /Molar mass

1.33 = Mass of Ba₃(PO₄)₂ / 601.9

Cross multiply

Mass of Ba₃(PO₄)₂ = 1.33 × 601.9

Mass of Ba₃(PO₄)₂ = 801 g

A is the answer! A chemical reaction always starts with the reactants and ends with a product!

Hope this helps x :)

Explanation:

The reactants are simply the substances present when a reaction begins.

Reactants are as opposed to products. The latter are substances that are present when a reaction is complete.

Reactants generally undergo chemical changes before they can form products. The chemical changes involve the breakage of old and the formation of new bonds among atoms of different elements that make up the reactants.

Reactants also need to summon an energy barrier before products can be formed. the energy barrier is known as activation energy.

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Answer:

Among these statements B is the correct answer.

The question is incomplete, the complete question is shown in the image attached.

Answer:

Cation

Explanation:

In a polar reaction mechanism, a specie must give out electrons and another specie must accept those electrons.

The specie that gives out electrons becomes electron deficient and positively charged so we refer to such a specie as a cation.

Hence, the specie that looses electrons becomes a cation.

The controlled burn cause of wildfires is least likely to lead to catastrophic results. Therefore, option (C) is correct.

A controlled burn is a fire set intentionally for purposes of forest management, prairie restoration, farming, or greenhouse gas. A controlled burn refers to the intentional burning of slash, fuels through burn piles.

Controlled burning can be done during the cooler months to reduce fuel buildup and reduce the likelihood of serious hotter fires. Controlled burning enhances the germination of desirable forest trees, and exposes soil mineral layers which expand seedling vitality.

Controlled burning is also useful in agriculture as it is often referred to as slash and burns. It is one component of shifting cultivation, as a section of field preparation for planting called field burning. This technique is utilized to clear the land of any existing crop residue and kill weeds and weed seeds.

Field burning is less expensive but because it forms smoke and air pollutants, its use is not common in agricultural areas.

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Answer:

This is the idea of spontaneous generation, an obsolete theory that states that living organisms can originate from inanimate objects. Other common examples of spontaneous generation were that dust creates fleas, maggots arise from rotting meat, and bread or wheat left in a dark corner produces mice

Explanation:

hope you like my answer

Answer: Density of methane is 0.92 g/L

Explanation:

The relation between density and molar mass is :

[tex]d=\frac{PM}{RT}[/tex]

where , d = density

P = pressure = 910 torr = 1.20 atm     (760 torr=1atm)

M = molar mass = 16 g/mol ( for methane)

R = gas constant  = [tex]0.0821Latm/Kmol[/tex]

T = temperature = 255 K

Putting the values :

[tex]d=\frac{1.20atm\times 16g/mol}{0.0821Latm/Kmol\times 255K}=0.92g/L[/tex]

Thus density of methane is 0.92 g/L

Answer:

liquid oxygen is highly flammable

Explanation:

near any source of heat. liquid oxygen can explode to flames thus being hazardous