Determine the number of atoms of O in 10.0 g of CO2.

Answer:

Answer:

it's A

Hope this helps

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Answer:

The pressure exerted by He on walls of balloon is 2.02 atm.

Explanation:

Given data:

Mass of helium = 25.0 g

Temperature = 22°C

Volume of gas = 75.0 L

Pressure exert by the gas on walls of balloon = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

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

T = temperature in kelvin

Now we will convert the temperature.

22+273 = 295 K

Now we will calculate the number of moles of He.

Number of moles = mass/ molar mass

Number of moles = 25 g/ 4 g/mol

Number of moles = 6.25 mol

Now we will put the values in formula.

P × 75.0 L = 6.25 mol × 0.0821 atm.L/mol.K ×295 K

P × 75.0 L = 151.372 atm.L

P = 151.372 atm.L  / 75.0 L

P = 2.02 atm

The pressure exerted by He on walls of balloon is 2.02 atm.

Answer:

the answer is a . trust me

Answer:

10% is a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4

The share of NAMSEK in year 4 is around $  shares (as given from the above table). Hence the value of one share will be $2.5/share

The share of ODX Group Inc., in year 4 is around $ shares (as given from the above table). Hence the value of one share is $

Therefore a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4 will be  

= 0.1 or 10 %

Answer:

Total cost = 1007.80 (Approx)

Explanation:

Given:

Length of fence = 125 m

Require = 30 nails per meter

40 nails cost = 10.75

Find:

Total cost

Computation:

Total nails require = 125 x 30

Total nails require = 3750

Total cost = 1007.80 (Approx)

Explanation:

A chemical change is the change in liquid substance

Hope it will help you

Answer:

Chromium Nitride

Explanation:

Answer:

Sn, Si, C

Explanation:

The periodic table consists of metals, non-metals and non-metalloids. The classification of the elements is mainly based on the chemical properties which are common among them. Here the correct option is A.

The elements which tend to lose electrons easily and are located on the left side of the periodic table are called metals. They are good conductors of heat and electricity. All metals are malleable, ductile and shows metallic lustre.

The elements which tend to gain electrons and are placed on the right side of the periodic table are called non-metals. Most of them are brittle and are not malleable or ductile. They have low melting and boiling points.

The elements which exhibit the properties of metals and non-metals are called metalloids. These elements are placed diagonally across the periodic table. They form alloys with metals.

Here among the given list of elements, Na, Si and O consists of metal, non-metal and metalloid.

Thus the correct option is A.

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Your question is incomplete, but most probably your full question was

which list of elements consists of a metal, a metalloid, and a nonmetal?

A. Na, Si, O

B. Ge, Si, Cl

C. He, N, F

D. None of the above

Answer:Electrons exhibit interference or diffraction due to scattering objects or apertures around the same size as their de Broglie wavelength. Electrons exhibit a discrete charge. Electrons exhibit a discrete mass. Electrons may tunnel through barriers of nanometer or below thickness

Explanation:

Electrons behave both as matter an waves in accordance with De Broglie principle of wave particle duality hence they possess an associated wavelength and as such undergo diffraction and interference.

Electrons have a known magnitude of mass and charge.

Many studies have also shown that electrons can tunnel through barriers of 1nm thickness or less.

Answer:The answer is D i got this answer because, the oldest layers are at te bottom and the youngest layers are on the top.

hope this answer heps!

Answer:

the energy of photons emitted by electron dropping from an excited energy state

The remaining grams of excess reactants NO is 0.68 g.

To balance the given redox reaction NO+Fe2+—>NO2- +Fe2+ we can follow the half-reaction method. Let's first write the unbalanced reaction:Fe2+ + NO → Fe3+ + NO2-Break down the reaction into two half-reactions:Fe2+ → Fe3+NO → NO2-The balanced half-reactions are:Fe2+ → Fe3+ + e- (multiply by 1)NO + H2O → NO2- + 2 H+ + e- (multiply by 2)The number of electrons lost in the oxidation half-reaction must be equal to the number of electrons gained in the reduction half-reaction. To balance the electrons, we multiply the oxidation half-reaction by 2:2 Fe2+ → 2 Fe3+ + 2 e-Balance the overall reaction by multiplying the reduction half-reaction by 2:2 NO + 2 H2O → 2 NO2- + 4 H+ + 2 e-The final balanced equation is:2 Fe2+ + 2 NO → 2 Fe3+ + 2 NO2-Now, let's calculate the mass of Fe that is optimal and the remaining grams of excess reactant. We are given that 20.0 g of NO are reacted with 31.4 g of Fe2+.The balanced equation shows that 2 moles of Fe2+ react with 2 moles of NO, which means the mole ratio is 1:1. Using the molar mass of Fe2+, we can convert the given mass of Fe2+ into moles:31.4 g Fe2+ x (1 mol Fe2+ / 55.845 g) = 0.561 mol Fe2+According to the balanced equation, 1 mole of Fe2+ reacts with 1 mole of NO. Therefore, 0.561 mol of NO must react with 0.561 mol of Fe2+. Using the molar mass of NO, we can convert the given mass of NO into moles:20.0 g NO x (1 mol NO / 30.01 g) = 0.666 mol NOWe have more moles of NO than the stoichiometrically required amount, which means NO is the excess reactant. To find the amount of Fe2+ that is optimal, we need to calculate the moles of Fe2+ required to react with 0.666 mol of NO:0.666 mol NO x (1 mol Fe2+ / 1 mol NO) = 0.666 mol Fe2+Therefore, the mass of Fe2+ that is optimal is:0.666 mol Fe2+ x 55.845 g/mol = 37.25 g Fe2+To find the remaining grams of excess NO, we subtract the amount of NO that reacted from the initial amount of NO:20.0 g NO - (0.666 mol NO x 30.01 g/mol) = 0.68 g NO.

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Answer:

388.62

Explanation:

well you convert yards into feet and feet into inches and inches into centimeters

Answer:

C

Explanation:

Noble gas or inert gas

Answer: C: Noble Gas

Hope this helps :)

Answer:

See Explanation

Explanation:

Given

(a) to (d)

Required

Determine whether the given parameters can calculate the required parameter

To calculate either Density, Mass or Volume, we have

[tex]Density = \frac{Mass}{Volume}[/tex]

[tex]Mass = Density * Volume[/tex]

[tex]Volume = \frac{Mass}{Density}[/tex]

(a) 432 g of table salt occupies 20.0 cm^3 of space

Here, we have:

[tex]Mass = 432g[/tex]

[tex]Volume = 20.0cm^3[/tex]

The above can be used to calculate Density as follows;

[tex]Density = \frac{Mass}{Volume}[/tex]

[tex]Density = \frac{432g}{20.0cm^3}[/tex]

[tex]Density = 21.6g/cm^3[/tex]

(b) 5.00 g of balsa wood, density of balsa wood : 0.16 g/cm^3

Here, we have:

[tex]Mass = 5.00g[/tex]

[tex]Density = 0.16g/cm^3[/tex]

This can be used to solve for Volume as follows:

[tex]Volume = \frac{Mass}{Density}[/tex]

[tex]Volume = \frac{5.00g}{0.16g/cm^3}[/tex]

[tex]Volume = 31.25cm^3[/tex]

(c) 32 cm^3 sample of gold density of 19.3 g/cm^3

Here, we have:

[tex]Volume = 32cm^3[/tex]

[tex]Density = 19.3g/cm^3[/tex]

This can be used to calculate Mass as follows:

[tex]Mass = Density * Volume[/tex]

[tex]Mass = 32cm^3 * 19.3g/cm^3[/tex]

[tex]Mass = 617.6g[/tex]

(d) 150 g of iron, density of Iron = 79.0 g/cm^3

Here, we have

[tex]Mass = 150g[/tex]

[tex]Density = 79.0g/cm^3[/tex]

This can be used to calculate volume as follows:

[tex]Volume = \frac{Mass}{Density}[/tex]

[tex]Volume = \frac{150g}{79.0g/cm^3}[/tex]

[tex]Volume = 1.90 cm^3[/tex] Approximated

Answer:

8.86 grams per cubic centimeter

Density: 8.86 grams per cubic centimeter

Explanation:

Answer:

d.miscible

Explanation:

If two liquids are completely miscible, no interfacial tension exists between them.

Interfacial tension is the force of attraction between between the molecules of a fluid that are in contact. This tension forms thick skin at the interface.

In miscible liquids, in which one liquid completely dissolves in another, there is no interfacial tension.

Interfacial tension does not allow miscibility of fluids as the tension between the interface is too great.

So, if two liquids are miscible, there is no interfacial tension between them.

Answer:

Al

Explanation:

Aluminum, the 13th element on the Periodic Table, is a Post-Transition metal.

Complete question is;

In the movie, "Raiders of the Lost Ark", Indiana Jones takes a gold idol from a cave. The statue is resting on a table which is rigged with a weight sensor. The weight sensor can detect when the weight is removed and will set off a series of unfortunate accidents. To prevent this from happening, Indiana replaces the gold idol with a bag of sand. The volume of the gold idol is approximately 1.0 L. The density of gold is 19.3 g/mL and the density of sand is 2.3 g/mL.

A) Assuming the idol is pure gold, what volume would the bag of sand have to be in order to weigh exactly the same as the idol and not set off the boo by-traps?

B) Let’s assume that Indiana is successful in removing the idol and returning with it to his laboratory. He decides to determine if it is really pure gold. He weighs the idol and measures the volume by a water displacement method. The results are: mass = 16.5 kg and volume of water displaced = 954 mL. Is the idol made of pure gold? Explain your answer based on the experimental results.

Answer:

A) Volume of sand = 8.391 L

B) The idol is not made of pure Gold.

Explanation:

A) We are given:

volume of the gold idol = 1 L = 1000 mL

Density of gold = 19.3 g/mL

Density of sand = 2.3 g/mL

So; mass of gold is gotten from the equation;

Density = mass/volume

Mass = density × volume

Mass of gold = 19.3 × 1000 = 19300 g

Now, we want to find what volume would the bag of sand have to be in order to weigh exactly the same as the idol.

Thus, volume of sand = 19300g/23 g/mL = 8391 mL or 8.391 L

B) We are now told the gold idol has;

mass = 16.5 kg = 16500 g

volume of water displaced = 954 mL.

Thus;

Density = 16500/954 = 17.3 g/mL

Now this value of 17.3 g/mL is lesser than that of pure gold given as 19.3 g/mL, it implies that the idol is not made of pure gold.

Determine the mass of the gold statue using its volume and density.

[tex]\to density = \frac{mass}{volume} \\ or \\ \to mass = density \times volume[/tex]

Converting the statue's volume from L to mL so that the volume unit and density unit correspond.

Calculating the mass of the statue:

[tex]\to 19.3\ \frac{g}{mL} \times 1000\ mL = 19,300\ g\\\\[/tex]

The weight of the sand must be the same as the weight of the statue, which is [tex]19,300\ g\\\\[/tex]

Calculate the volume of sand required using the mass and density of the sand.

[tex]\to density = \frac{mass}{volume} \\ or \\ \to mass = density \times volume[/tex]

Calculating the volume of required sand:

[tex]\to \frac{19,300\ g}{23 \ \frac{g}{mL}} = 8391\ mL \ or\ 8.391\ L[/tex]

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Answer:

a. electrophilic aromatic substitution

b. nucleophilic aromatic substitution

c. nucleophilic aromatic substitution

d. electrophilic aromatic substitution

e. nucleophilic aromatic substitution

f. electrophilic aromatic substitution

Explanation:

Electrophilic aromatic substitution is a type of chemical reaction where a hydrogen atom or a functional group that is attached to the aromatic ring is replaced by an electrophile. Electrophilic aromatic substitutions can be classified into five classes: 1-Halogenation: is the replacement of one or more hydrogen (H) atoms in an organic compound by a halogen such as, for example, bromine (bromination), chlorine (chlorination), etc; 2- Nitration: the replacement of H with a nitrate group (NO2); 3-Sulfonation: the replacement of H with a bisulfite (SO3H); 4-Friedel-CraftsAlkylation: the replacement of H with an alkyl group (R), and 5-Friedel-Crafts Acylation: the replacement of H with an acyl group (RCO). For example, the Benzene undergoes electrophilic substitution to produce a wide range of chemical compounds (chlorobenzene, nitrobenzene, benzene sulfonic acid, etc).

A nucleophilic aromatic substitution is a type of chemical reaction where an electron-rich nucleophile displaces a leaving group (for example, a halide on the aromatic ring). There are six types of nucleophilic substitution mechanisms: 1-the SNAr (addition-elimination) mechanism, whose name is due to the Hughes-Ingold symbol ''SN' and a unimolecular mechanism; 2-the SN1 reaction that produces diazonium salts 3-the benzyne mechanism that produce highly reactive species (including benzyne) derived from the aromatic ring by the replacement of two substituents; 4-the free radical SRN1 mechanism where a substituent on the aromatic ring is displaced by a nucleophile with the formation of intermediary free radical species; 5-the ANRORC (Addition of the Nucleophile, Ring Opening, and Ring Closure) mechanism, involved in reactions of metal amide nucleophiles and substituted pyrimidines; and 6-the Vicarious nucleophilic substitution, where a nucleophile displaces an H atom on the aromatic ring but without leaving groups (such as, for example, halogen substituents).

Answer:

Compound.

Explanation:

NaCl, or sodium chloride, is an ionic compound that is formed from the element Sodium (Na) and Chlorine (Cl). It is commonly known as salt.

Answer:

Explanation:

its geocentric, retrograde, faster

Answer:

A & B

Explanation:

Noble Gases are the least reactive as they have a full valence shell (and are stable)

Answer:

The answer to your question is B

Thermodynamics is the study of science that deals with the relation and movement of heat, work, temperature, and energy. Thus, option B is correct.

Thermodynamics is the science that deals with the relation and the flow of heat and energy concerning entropy and enthalpy of matter. According to the laws of thermodynamics, the energy or the heat of the substances or the system cannot be formed through new reactions nor they can be destroyed.

The second law states about the spontaneous and non-spontaneous reactions and their relation to entropy and enthalpy of the reaction. In the third law, for a pure substance, the entropy reaches zero with the temperature also approaching zero.

Therefore, thermodynamics deals with the flow of heat and energy.

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Given parameters:

Number of atoms of Mn = 3.22 x 10²²atoms

Mass of the bone = 1kg

Unknown:

Mass of Mn = ?

To solve this problem:

Road map

The number of moles is the amount of a substance that contains the Avogadro's number of particles 6.02 x 10²³

Molecular mass is the mass in grams of one mole of the substance.

Number of particles are elementary particles such as atoms, molecules, formula units, ions, electrons, protons, neutrons e.t.c

     Number of moles  = [tex]\frac{number of particles}{6.02 x 10^{23} }[/tex]

    Mass  = number of moles x molecular mass

Input parameters,

  number of particles = Number of moles of Mn = [tex]\frac{number of particles}{6.02 x 10^{23} }[/tex]

                       Number of moles of Mn = [tex]\frac{3.22 x 10^{20} }{6.02 x 10^{23} }[/tex]   = 0.53 x [tex]10^{-3}[/tex]moles

To find the unknown mass, we need to know the molecular mass of Mn. This value is found on the periodic table and it is 55g/mol

   So, mass of Mn  = number of moles of Mn x molecular mass of Mn

                               = [tex]0.53 x 10^{-3}[/tex] x  55

                                = 0.029g

Mass of Mn contain in 1kg of bone is 0.029g

The mass (g) that should be found in 1 kg of bone is 0.029g.

Here we understand the relationship between a number of moles, mass, molecular mass, and a number of particles. Now Solve for the number of moles by using the number of atoms given. And, Using the number of moles we determine the mass of the unknown. Finally, understand the relationship between the number of moles, mass, molecular mass, and a number of particles.

The number of moles should be the amount of a substance that comprise of the Avogadro's number of particles 6.02 x 10²³. Molecular mass represent the mass in grams of one mole of the substance. And, the number of particles should be  elementary particles like atoms, molecules, formula units,etc.

We know that

   Mass  = number of moles x molecular mass

So,

The number of moles should be [tex]= 3.22x10^{23} \div 6.02x10^{23}[/tex]

= [tex]0.53 \times 10^{-3}[/tex] moles

Now

Mass of mn should be

= number of moles of Mn x molecular mass of Mn

= [tex]0.53 \times 10^{-3} \times 55[/tex]

=  0.029g.

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Pls find my answer bellow

Answer:

heterogeneous mixture

Explanation:

because pizza has different phases I think

The type of mixture that pizza can be classified is Heterogeneous mixture

Therefore, heterogeneous mixture can be regarded as one having more than a substance.

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