What do you think air would
look like if you could zoom in and see its
structure and composition

In the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.

In the balanced chemical compound C₂H₆O, we can deduce the following;

1 mole of C₂H₆O contains 6 moles of hydrogen

0.2 mole of C₂H₆O = ?

= 0.2 x 6 moles = 1.2 moles of hydrogen

Thus, in the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.

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Answer:

9.990-357

Explanation:

aru not arh is 9.990-357

If number of bonds is three (3) then bond angle is 120° and structure is trigonal and if number of bonds is four( 4) then bond angle will be 109° 28' and structure is tetrahedral.

The angle between two bonds in a complex molecule or between two orbitals that include bonding electron pairs encircling the core atom is the bond angle. It is calculated and represented in degrees using a spectroscopic method.

When a single electron pair there at central atom begins to resist the bound pair of electrons, the bond angle decreases and the bonds are slightly shifted inward. When there is a increase in back bonding, the bond angle increases.

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The mass of the percent of the 10 g solute in the 105 g solvent is 8.69 %.

The mass of the solute = 10 g

The mass of the solvent = 105 g

The mass of the solution = 10 g + 105 g

The mass of the solution = 115 g

The mass of the percent is expressed as :

The mass of percent = ( mass of solute / mass of solution ) × 100 %

The mass of solute = 10 g

The mass of solution = 115 g

The mass of percent = ( 10 / 115 ) × 100 %

The mass of percent = 8.69 %

Thus, the mass of percent is 8.69 % and the mass of solute is 10 and the mass of the solution is 115 g.

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Taking into account the reaction stoichiometry, 2.95 grams of MgO from 1.78 g of Mg and 2.36 g of O₂.

In first place, the balanced reaction is:

2 Mg + O₂  → 2 MgO

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 32 grams of O₂ reacts with 48.62 grams of Mg, 2.36 grams of O₂ reacts with how much mass of Mg?

mass of Mg= (2.36 grams of O₂× 48.62 grams of Mg)÷ 32 grams of O₂

mass of Mg= 3.586 grams

But 3.586 grams of Mg are not available, 1.78 grams are available. Since you have less mass than you need to react with 2.36 grams of O₂, Mg will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 48.62 grams of Mg form 80.62 grams of MgO, 1.78 grams of Mg form how much mass of MgO?

mass of MgO= (1.78 grams of Mg× 80.62 grams of MgO)÷ 48.62 grams of Mg

mass of MgO= 2.95 grams

Finally, 2.95 grams of MgO can be produced.

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Answer:

because the fossils are beutifule

Explanation:

because the fossils are rare in the world

Answer:

our bodies will dehydrate causing us to die a dreadfully excruciating painful death

Answer:

\(T_{sol}=-15.9\°C\)

Explanation:

Hello,

In this case, we can analyze the colligative property of solutions - freezing point depression - for the formed solution when ethylene glycol mixes with water. Thus, since water freezes at 0 °C, we can compute the freezing point of the solution as shown below:

\(T_{sol}=T_{water}-i*m*Kf\)

Whereas the van't Hoff factor for this solute is 1 as it is nonionizing and the molality is:

\(m=\frac{mol_{solute}}{kg\ of\ water}=\frac{45.0g*\frac{1mol}{62g} }{85.0g*\frac{1kg}{1000g} } =8.54m\)

Thus, we obtain:

\(T_{sol}=0\°C+(-8.54m*1.86\frac{\°C}{m} )\\\\T_{sol}=-15.9\°C\)

Best regards.

The freezing point of a solution prepared from 45.0 g ethylene glycol and 85.0 g of water is -15.9 °C.

Freezing point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.

We will use the definition of molality.

b = mass of solute / molar mass of solute × kg of solvent

b = 45.0 g / 62.07 g/mol × 0.0850 kg = 8.53 m

We will use the following expression, where Kf is the cryoscopic constant of water.

ΔT = Kf × b = 1.86 °C/m × 8.53 m = 15.9 °C

The freezing point of pure water is 0°C.

T = 0°C - 15.9 °C = -15.9 °C

The freezing point of a solution prepared from 45.0 g ethylene glycol and 85.0 g of water is -15.9 °C.

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By the concept of calculating moles ,it can br concluded that the no. of atoms of phosphorus in 8.80mol of copper(II) phosphate is=1.06\(x10^{25}\)

A mole is defined as amount of substance containing as many as elementary entities that are there in atoms of exactly 12 g of carbon-12.Therefore we can say,1 mole of copper(II) phosphate, Cu3(PO4)2, contains three moles of copper(II) cations and two moles of phosphate anions.

Again 1mole of phosphate anions contains one mole of phosphorus and four moles of oxygen.Considering all these informations we can conclude that:1 mole of copper(II) phosphate contains 2 moles of Phosphorus

Accordingle the sample contains=(8.80\(x\)2) moles of Phosphorus

                                    =(17.6\(x\)Avogadro's constant) atoms of  Phosphorus

                                    =(17.6\(x\)6.022\(x\)\(10^{23}\)) atoms of  Phosphorus

                                    =1.06\(x10^{25}\) [approx] no. of Phosphorus atoms

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In 8.80 moles of copper(II) phosphate, there are approximately 1.06 x 10²⁵ atoms of phosphorus.

The number of atoms of phosphorus in a given amount of a compound can be calculated using the concept of mole in chemistry. Copper(II) phosphate is Cu3(PO4)2, containing 2 moles of phosphorus (P) for every 1 mole of the compound. Avogadro's number (6.022 x 10²³) gives the number of atoms in one mole.

So, if there are 8.80 moles of copper(II) phosphate, there would be 2 × 8.80 moles of phosphorus. Multiplying this by Avogadro's number gives the total number of phosphorus atoms.

Therefore, the number of phosphorus atoms is 2 × 8.80 × 6.022 x 10²³ = 1.06 x 10²⁵ atoms of phosphorus.

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Answer:

Na and Cl option d.

Explanation:

Ionic bond commonly occurs between a metal and non metal on combining to produce a compound.

In that case, the most appropriate choice would be to go with

option d - Na and Cl.

They combine to form common salt or NaCl.

Na ( sodium) is a metal while Cl (chlorine) is a non metal.

The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.

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Answer:

3,5-dichlorohex-1-ene

Explanation:

The compound is; H2C=CH-C(Cl)H-CH2-C(Cl)H-CH3. We can rightly call this compound by the name, 3,5-dichlorohex-1-ene.

We arrived at this name by first counting the longest parent carbon chain, that gives hexane. The compound has a double bond at the 1-position. Also, there are two substituent chlorine atoms at positions 3 and 5 in the structure, hence the name given.

Answer:

This question is incomplete

Explanation:

This question is incomplete but there are two parts to this question that can generally be answered without the missing parts.

(1) If a CO₂ molecule starts out surrounded by other CO₂ molecules, does this influence how quickly it will reach the other side of the leaf?

What controls how quickly a CO₂ molecule/molecules enter into the leaf to the other parts of a leaf is the stomata on the leaf. Stomata are tiny openings on a plant leaf that allows for gaseous exchange (the release of oxygen and the absorption of CO₂) in the leaf.

(2)  Collisions influence how molecules move, but do molecules only collide with other molecules of the same substance? NO

One of the kinetic theory of gases states that gases collide with one another and against the walls of the container. It should however be noted that, gas molecules of a particular substance can collide with gas molecules of other substances, so far they are within the same container.

Answer:

You eat a hamburger and breathe in oxygen.

Oxygen goes immediately from your lungs to blood vessels to cells.

Food molecules in the hamburger are broken down into glucose in the digestive system.

Explanation:

The density : 1.96 g/L

Ideal gas Law

Pv=nRT

where  

P = pressure, atm , N/m²  

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m², v= m³)  

T = temperature, Kelvin  

so for density,

MW CO₂ = 44 g/mol

\(\tt \rho=\dfrac{P\times MW}{RT}\\\\\rho=\dfrac{1\times 44}{0.082\times 273}\\\\\rho=1.96~g/L\)

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns.

During El Niño years, Christchurch may experience cooler air temperatures due to several factors associated with the El Niño phenomenon.

El Niño is characterized by the abnormal warming of the surface waters in the eastern tropical Pacific Ocean, which has global climatic implications. While El Niño is primarily associated with changes in oceanic conditions, its effects can extend to atmospheric patterns, leading to altered weather patterns and temperature variations.

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns. El Niño can disrupt the normal global atmospheric circulation, resulting in changes in the positioning and intensity of weather systems.

This can lead to the advection of cooler air masses from the south or southeast towards Christchurch, resulting in cooler temperatures.

Another factor is the influence of El Niño on regional rainfall patterns. El Niño often leads to drier conditions in the South Island of New Zealand, including Christchurch.

Reduced cloud cover and less moisture in the air can contribute to cooler temperatures as there is less insulation from the sun's radiation and less evaporative cooling. Additionally, the absence of significant rainfall can result in less moisture in the soil, leading to cooler conditions as less energy is used for evaporation.

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Answer:

AG rxn=+394.4 kJ

Explanation:

2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams. Density is the mass of a specific material per unit volume.

Density is the mass of a specific material per unit volume. Density is defined as d = M/V, in which d represents density, M is weight, as well as V is volume. Density is generally expressed in grams every cubic centimetre. Water, for example, has a density of 1 gram per square centimeter, but Earth has a density of 5.51 kilograms per cubic centimetre.

Density is sometimes measured in kilos per cubic centimeter (in metre-kilogram-second or SI units). The density of air, for example, is 1.2 kilos per cubic metre. 

density = mass / volume

            =53/ 20

            =2.65g/ml

Therefore, 2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams.

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1. No. 108 g of Ag has a lower number of atoms than 80 g of Ca.

2. The gram of \(SO_3\) in 3 moles of the compound would be 240 g.

3. 1.20 x \(10^{24\) atoms

4. The grams of hydrogen in 3.6 x \(10^{24\) molecules of \(NH_3\) would be 18 grams.

According to Avogadro, 1 mole of a substance contains 6.022 x \(10^{23\) molecules or atoms.

Recall that: mole = mass/molar mass

1. 108 g of Ag would be equivalent to: 108/108 = 1 mol.

80 g of Ca would be equivalent to: 80/40 = 2 mol

Since 1 mol is equivalent to 6.022 x \(10^{23\) molecules or atoms, it means 80 g of Ca has twice as atoms as 108 g of Ag.

2. 3 mol sample of \(SO_3\) would be equivalent to: 3 x 80 = 240 g

3. 124 g of \(Na_2O\) would be equivalent to: 124/62 = 2 mol

Number of atoms = 2 x 6.022 x \(10^{23\)

                              = 1.20 x \(10^{24\) atoms

4. 3.6 x \(10^{24\) molecules of \(NH_3\) would be equivalent to:

  3.6 x \(10^{24\)/6.022 x \(10^{23\) = 6 mol of \(NH_3\)

\(NH_3 --- > 3H^+ + N^{3-\)

From the above equation, 1 mole of \(NH_3\) produces 3 moles of hydrogen.  Thus,  6 moles of  \(NH_3\) would be equivalent to 18 moles of hydrogen.

18 moles of hydrogen = 18 x 1

                                    = 18 g

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Answer:

Explanation:

This is an acid-base reaction (neutralization): CaCO3 is a base, HCl is an acid.

Given chemical equation: CaCO3 + HCl → CaCl2 + H2O + CO2

Balanced chemical equation: CaCO3 + 2HCl → CaCl2 + H2O + CO2

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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Answer:

\(m_{CO2}=8.33gCO2\)

Explanation:

Hello.

In this case, since the chemical reaction is:

\(C_7H_5N_3O_6(s)+\frac{21}{4} O2(g)\rightarrow 7CO_2(g)+\frac{3}{2} N_2(g)+\frac{5}{2} H_2O(l)\)

Thus, since we have the initial moles of TNT:

\(n_{TNT}=25.7g*\frac{1mol}{227.13g} =0.113mol\)

And the initial moles of oxygen given the ideal gas equation:

\(n_{O_2}=\frac{6.93atm*0.5L}{0.082\frac{atm*L}{mol*K}*298K}=0.142molO_2\)

Given the 1:7 mole ratio between TNT and carbon dioxide and the 21/4:7 mole ratio between oxygen and carbon dioxide, we compute the yielded moles by each reactant:

\(n_{CO_2}^{by\ TNT}=0.113molTNT*\frac{7molCO_2}{1molTNT}=0.791molCO_2\\\\ n_{CO_2}^{by\ O_2}=0.142molO_2*\frac{7molCO_2}{21/4molO_2}=0.189molCO_2\)

Thus, since oxygen yields less moles of carbon dioxide than TNT, we infer it is the limiting reactant, therefore, the produced mass of carbon dioxide is:

\(m_{CO2}=0.189molCO2*\frac{44.01gCO2}{1molCO2}\\\\m_{CO2}=8.33gCO2\)

Best regards!

Answer:

Calcium atom:
20 protons, 20 electrons
Calcium 2+ ion:
It is a calcium atom but with 2 fewer electrons, so
20 protons,  18 electrons
Oxygen atom:
8 protons and 8 electrons
Oxygen 2- ion:
It is an oxygen atom but with 2 more electrons, so
8 protons, 10 electrons
Calcium oxide:
Add protons and electrons of of Ca with O to get:
20 + 8 protons = 28 protons, 20 + 8 electrons: 28 electrons.
Alternatively, add protons and electrons of Ca{2+} and O{2-} to get the same result.

The correct number of protons and electrons of the given ions are as follows:

The number of protons and electrons in an atom or ion determines the overall charge of the ion or atom.

In a neutral atom, the number of protons and electrons are equal, hence, the overall charge of the atom is 0. However, in a charged atom (ion), the difference between the proton and electron number is the base.

It is important to note that the number of protons is the atomic number of an atom, hence, does not change. However, the number of electrons changes depending on whether electrons are gained or lost.

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Answer:

atoms

Explanation:

.......................................

At its heart, chemical reactions are the breaking and making of bonds, and the shuffling around of atoms.

Chemical reactions are defined as a procedure that takes place when multiple molecules combine to create a new product. Reactants are substances that interact to make new substances, whereas products are those substances that result from the interaction. Nearly all of the materials you come into contact with on a daily basis are the product of chemical transformations, however nuclear processes can also create new matter.

Bond disassociation is the breaking of a bond. Bond formation is the same as bond making. The hydrolysis is a type of chemical process in which the connection between two molecules is severed while water is added. Two molecules are produced when a bond is broken. Water molecules have hydrogen ions connected to one molecule and hydroxyl ions bound to another.

Thus, at its heart, chemical reactions are the breaking and making of bonds, and the shuffling around of atoms.

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Answer:

The answer to the question is 78

Answer:

78

Explanation:

In rounding off to two, we consider the third digit. if it is more than five we ad one to the second digit otherwise we truncate.

in the case of 77.616, we add one to the second digit and truncate the rest.

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the  pH of a 0.01 M acetic acid.

Any hydrogen that comprises a material capable of giving a proton (a hydrogen ion) to another chemical is defined as acid. A base is indeed a molecule or ion that can receive a hydronium ion from just an acid.

1)Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. The pH value of stronger acid is lower.

2)CH\(_3\)COOH + H\(_2\)O  ⇄ CH\(_3\)COO⁻+  H\(_3\)O⁺

 0.01             0               0

 -x              +x                +x

 0.01-x           +x        +x

Ka=[ CH\(_3\)COO⁻][H\(_3\)O⁺]/[CH\(_3\)COOH]

1.8×10⁻⁵ = [x][x ]/[  0.01-x ]

x=1.34×10⁻³

pH = -log[H⁺]

     =  -log[1.34×10⁻³]

     =2.88

Therefore, because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the   pH of a 0.01 M acetic acid.

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