Which of the following is a characteristic science?

Answer:

12 moles of F₂

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

N₂ + 3F₂ —> 2NF₃

From the balanced equation above,

3 moles of F₂ reacted to produce 2 moles of NF₃.

Finally, we shall determine the number of mole of F₂ needed to produce 8 moles of NF₃. This can be obtained as illustrated below:

From the balanced equation above,

3 moles of F₂ reacted to produce 2 moles of NF₃.

Therefore, Xmol of F₂ will react to produce 8 moles of NF₃ i.e

Xmol of F₂ = (3 × 8)/2

Xmol of F₂ = 12 moles

Thus, 12 moles of F₂ is needed for the reaction.

Answer:

1. nitric acid: sa

2. perchloric acid: sa

3. hydrofluoric acid: wa

Explanation:

A strong acid (sa) is the one that is completely dissociated into ions in water. Conversely, a weak acid (wa) is not completely dissociated in water.

From the options, the strong acids are:

1. nitric acid (HNO₃). It dissociates completely into ions when is dissolved in water, as follows:

HNO₃ → H⁺ + NO₃⁻

2. perchloric acid (HClO₄). It is completely dissociated in water as follows:

HClO₄ → H⁺ + ClO₄⁻

The weak acid is hydrofluoric acid (HF). In water, only a small proportion is dissociated into ions. The proportion of ions formed is given by the equilibrium constant Ka. The dissociation is written by using double arrows:

HF ⇄ H⁺ + F⁻

Answer:

0.576M and 0.655m

Explanation:

...Dissolves 15.0g of styrene (C₈H₈) in 250.mL of a solvent with a density of 0.88g/mL...

Molarity is defined as moles of solute (Styrene in this case) per liter of solution whereas molality is the moles of solute per kg of solvent. Thus, we need to find the moles of styrene, the volume in liters of the solution and the mass in kg of the solvent as follows:

Moles styrene:

Molar mass C₈H₈:

8C = 12.01g/mol*8 = 96.08g/mol

8H = 1.005g/mol* 8 = 8.04g/mol

96.08g/mol + 8.04g/mol = 104.12g/mol

Moles of 15.0g of styrene are:

15.0g * (1mol / 104.12g) = 0.144 moles of styrene

Liters solution:

250mL * (1L / 1000mL) = 0.250L

kg solvent:

250mL * (0.88g/mL) * (1kg / 1000g) = 0.220kg

Molarity is:

0.144 moles / 0.250L =

Molality is:

0.144 moles / 0.220kg =

Answer:

44x+7y

Explanation:

The number of molecules in one mole of water is 6.02 × 10²³. Therefore, the number of moles of carbon dioxide which contains 9.04 × 10²³ molecules is 1.50.

The number of atoms that constitutes one mole of a substance is called Avogadro number. It is equal to  6.02 × 10²³. Thus, one mole of every elements contains Avogadro number of atoms.

Similarly, one mole of a compound contains  6.02 × 10²³ number of molecules. Thus, one mole of carbon dioxide contains these much molecules.

Given the number of molecules of water = 9.04 × 10²³

Then, no.of moles = number of molecules/ Avogadro number.

no.of moles =9.04× 10²³ /6.022 × 10²³  = 0.68.

Therefore, the number of moles of H₂O that contains 9.04 × 10²³molecules is 1.50

Find more on Avogadro number:

http://brainly.com/question/28834341

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Answer:

water - irrigation

forests - paper

wetlands - trapping sediments

parks - preserving aesthetic value

Explanation:

One important use of water is for the irrigation of farmlands. Irrigation makes it possible for farming activities to continue all year round.

The papers yield pulp which is used to produce paper. This implies that paper is important product obtained from the forest.

The wetlands trap sediments and retain particulates from both onsite and offsite sources(blue earth county).

A park serves to preserve aesthetic value. This is a primary importance of the parks.

Answer:

Because the molecules of the mixture would be compact or bond together at room temperature. In this case, both gases will condense to form water (or ice, if the room temperature is prolonged) and such droplets of water will not cause a balloon to spontaneously explode at room temperature.

Explanation:

A mixture of hydrogen and oxygen will form water. Recall that the chemical formula for water is H₂O, where H represents Hydrogen and O represents Oxygen.

A balloon is a light (not thick) solid substance with a thin membrane when blown or filled with some elements or gases.

Room Temperature means cool or cold temperature. You already know that generally at room temperature, the molecules of any substance will stick together or will become less mobile (less spontaneous).

In this case, hydrogen gas and oxygen gas will go through a process called condensation - to form water - and then through the process called freezing - to form ice.

At room temperature, the gases will first change state (state of matter) from gaseous to liquid and then from liquid to solid.

This is why the balloon will NOT spontaneously explode.

Answer:

2. North pole

Answer:

[tex]1.385\ \text{moles}[/tex]

Explanation:

[tex]m[/tex] = Mass of chlorine gas produced = [tex]98.2\ \text{g}[/tex]

[tex]M[/tex] = Molar mass of chlorine gas [tex]Cl_2[/tex] = [tex]70.9\ \text{g/mol}[/tex]

Number of moles is given by

[tex]n=\dfrac{m}{M}[/tex]

[tex]\Rightarrow n=\dfrac{98.2}{70.9}[/tex]

[tex]\Rightarrow n=1.385\ \text{moles}[/tex]

Number of moles of chlorine gas produced is [tex]1.385\ \text{moles}[/tex].

Answer:

40.5%  is abundance of X-122

Explanation:

we know there are two naturally occurring isotopes of X, X-120  and X-122.

First of all we will set the fraction for both isotopes

X for the isotopes having mass 122

1-x for isotopes having mass 12 0

The average atomic mass of X is 120.81 amu

we will use the following equation,

122x + 120 (1-x) = 120.81

122x + 120 - 120x = 120.81

122x- 120x = 120.81 -120

2x = 0.81

x= 0.81/2

x= 0.405

0.405 × 100 = 40.5%

40.5%  is abundance of X-122 because we solve the fraction x.

now we will calculate the abundance of X-120.

(1-x)

1 - 0.405 = 0.595

0.595  × 100 = 59.5 %

59.5 %  for X-120.

Answer:

Y: tRNA

Z: DNA

Explanation:

This question involves two different nucleic acid molecules that are involved in protein production. Xavier used a chart to highlight the functions these nucleic acids perform during protein synthesis.

- Transfer RNA known as tRNA is a type of RNA molecule found in the ribosomes. It functions to read the mRNA codon and carry corresponding amino acid to the ribosomes for linking with one another. Based on this, "Y" on the chart is a tRNA molecule.

- Deoxyribonucleic acid, also known as DNA, is a molecule found in the NUCLEUS whose function is to store the genetic information in the cell. DNA carries the information needed for the synthesis of protein. Based on this, Z is a DNA molecule.

Answer:

The guy above is right! I got 100 on my test :]

Answer:

[tex]\% rec=80.4\%[/tex]

Explanation:

Hello!

In this case, since the percent recovery for this crystallization operation is computed as shown below:

[tex]\% rec=\frac{m_{recovered}}{m_{initial}} *100\%[/tex]

Thus, by plugging in the initial 8.95 g and the recovered 7.20 g, we obtain:

[tex]\% rec=\frac{7.20g}{8.95g} *100\%\\\\\% rec=80.4\%[/tex]

Best regards!

The total pressure  inside the balloon : 62.1 atm

Given

2 g of H2 gas (MM= 2g/mol)

16 g of Ne gas (MM= 4g/mol)

2 L balloon  at 30'C

Required

The total pressure

Solution

mol H2 :

= mass : MM

= 2 : 2

= 1

mol Ne :

= 16 : 4

= 4

Total mol of gas = 5

T = 30+273 = 303 K

Ideal gas law :

P = nRT/V

P = 5 moles x 0.082 L.atm/mol.K x 303 K / 2 L

P = 62.1 atm

Answer:

C. Mix household cleaners to get a stronger cleaning product

Explanation:

dont ever try that

C. Mix household cleaners to get a stronger product.

This is not safe because mixing chemicals may cause a toxic gas to form. This gas is toxic to people and can cause health issues.

I'm really sorry it took so long the school Wifi cut off while i was writing it lol

Answer: 0.00507 moles

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in ml

1. moles of napthalene = [tex]\frac{3.09\times 0.001\times 100.0}{100}=0.000309moles[/tex]

2. moles of methyl napthalene = [tex]\frac{10.0\times 0.001\times 100.0}{1000}=0.001mole[/tex]

3. moles of dimethyl napthalene = [tex]\frac{23.2\times 0.001\times 100.0}{1000}=0.00232moles[/tex]

4. moles of trimethyl napthalene = [tex]\frac{14.4\times 0.001\times 100.0}{1000}=0.00144moles[/tex]

Thus total moles of all naphthalene compounds combined is (0.000309+0.001+0.00232+0.00144) = 0.00507.

IM NOT SURE IF MY ANSWERS RIGHT SO IM NOT POSITIVE SORRY

Answer:

D. Radiation from the sun

Explanation:

The main source of thermal energy for the earth is Sun. The sun is major source which provide heat energy and light energy to the earth. The sun converts almost 4 million tons of energy into electromagnetic radiations which is a source of thermal energy for Earth's Mantle.

Answer:  B. trigonal planar

Explanation:

Valence Shell Electron Pair Repulsion Theory (VSEPR) is a model to predict the geometry of the atoms making up a molecule where atoms are arranged such that the forces of repulsion are minimum.

If a central atom is bound to three electron domains ,the number of electron pairs is 3, that means the hybridization will be [tex]sp^2[/tex] and the electronic geometry of the molecule will be trigonal planar as the electron pairs will repel each other and attain a position which is most stable.

Example: [tex]BCl_3[/tex] with 3 electron domains has trigonal planar geometry.

Answer: Once nitrogen is converted into compounds like ammonium and nitrate, these can be taken up from soils by plants and then the nitrogen can be used to form macromolecules like proteins and nucleic acids (DNA and RNA).

The answer is proteins

Answer:

Mass = 157.56 g

Explanation:

Given data:

Mass of Xe in gram = ?

Volume = 26.17 L

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Solution:

we will calculate the number of moles first.

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

1 atm ×26.17 L = n×0.0821 atm.L/ mol.K  × 273.15 K

26.17 atm.L = n× 22.43 atm.L/ mol

n = 26.17 atm.L / 22.43 atm.L/ mol

n = 1.2 mol

Mass of Xe:

Mass = number of moles × molar mass

Mass = 1.2 mol × 131.3 g/mol

Mass = 157.56 g

Answer:

The answer to your question is given below

Explanation:

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

Mass of cholesterol (in μg) = 203 μg

Mass of cholesterol (in Kg) =?

The following conversion scale can be used to convert micro grams (μg) to kilogram (kg).

1 μg = 1×10¯⁹ Kg

Therefore,

203 μg = 203 μg × 1×10¯⁹ Kg / 1 μg

203 μg = 2.03×10¯⁷ Kg

Thus, 203 μg is equivalent to 2.03×10¯⁷ Kg

Answer:

Ground water

Explanation:

The ground water reservoir is found underground in cracks and spaces in the soil, sand and rock.

Ground water is a very important portion of the water cycle where water is stored in an aquifer.

Aquifers are porous and permeable formations that stores ground water within them.

In this manner, ground water system is recharged by infiltration of water from the surface. Water percolates and collects inside an aquifer in this manner.

Answer:

Ground Water

Explanation:

Answer: Moseley's experiments in X-ray spectroscopy showed directly from their physics that cobalt and nickel have the different atomic numbers, 27 and 28, and that they are placed in the Periodic Table correctly by Moseley's objective measurements of their atomic numbers.

Explanation:

Answer:

1) Traits

Explanation:

Strength, sickness, Stretchiness, and color are all different because they result in a different body part and there all traits of the body

Answer:

autom is 18.63 g

Explanation:

there

Answer:

A) Gravitational Pull

Explanation:

Objects on Earth are pulled toward the center of Earth. The force of gravity, like all other forces, can cause changes in the speed of objects.

Answer:

c

Explanation:

Answer:

The dihedral angle between the X substituents for the anti conformation is 180°

Explanation:

Note: I think this question is not complete. Still, it can be answered. But for your concept and understanding, I am completing this question and then I will try to solve this question for you.

Other part of this question is about Gauche conformations and angle between the x substituents.

So, I will be drawing and answering both.

Answer to the original question: 180°

So, the dihedral angle between the X substituents for the anti conformation is 180°

Answer to the Gauche Conformation: 60°

Here, in this question we are discussing about the possible different staggered conformations of CH2XCH2X

You can see the angles between the X substitutes in anti conformations and Gauche Conformations for yourself in the attachment below.

Furthermore, this CH2XCH2X has 3 possible different staggered conformations. Out of which, one is anti conformation and other two are Gauche conformations.

Please refer to the attachment to see the conformations. Check the angles between X-X. In anti conformation, angle between X-X is 180° and energy is lower, because of the less interaction between H and X. However, in Gauche conformation, angle between X-X is 60° and energy is higher, because of the more interactions between H and X than anti conformation.