Which model most accurately represents the current view of the structure of the atom? Planetary Model Probability Model Planetary model
Probability model

Answer:

it's state changes from solid to liquid

Answer:

boiling point can be used to tell how long something I.e water would take to boil.

boiling point can also tell us the amount if heat needed to be applied for the substance to boil

The only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.

The term chiral center refers to a carbon atom that is attached to four different atoms or groups. This kind of carbon atom is able to rotate the direction of plane polarized light.

We can see from the structure of the molecule that the only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.

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Answer: D) 2.37°C

Explanation:

[tex]4.39x10^5J(\frac{g°C}{4.184J} )(\frac{kg}{1000g})(\frac{1}{44.3kg} )[/tex] [tex]=2.37°C[/tex]

Answer:

Theoretical Yield  =  51.9 grams PI₃

Percentage Yield  =  96.3% PI₃

Explanation:

To find the theoretical and percent yield of PI₃, you need to (1) convert grams I₂ to moles I₂ (via molar mass), then (2) convert moles I₂ to moles PI₃ (via mole-to-mole ratio from reaction coefficients), then (3) convert moles PI₃ to grams PI₃ (via molar mass), and then (4) calculate the percent yield. It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answers should have 3 sig figs to match the sig figs of the given values.

Molar Mass (I₂): 2(126.90 g/mol)

Molar Mass (I₂): 253.8 g/mol

Molar Mass (PI₃): 30.974 g/mol + 3(126.90 g/mol)

Molar Mass (PI₃): 411.674 g/mol

2 P(s) + 3 I₂(s) -----> 2 PI₃(s)

48.0 g I₂            1 mole              2 moles PI₃            411.674 g
---------------  x  -----------------  x  ----------------------  x  ------------------  =  
                         253.8 g               3 moles I₂              1 mole

=  51.9 g PI₃

                                           Actual Yield
Percentage Yield  =  ---------------------------------  x  100%
                                      Theoretical Yield

                                     50.0 g PI₃
Percentage Yield  =  --------------------  x  100%
                                     51.9 g PI₃

Percentage Yield  =  96.3% PI₃

The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the balanced chemical equation

Zn + 2HI → ZnI₂ + H₂

Here Zn is a reducing agent, HI is an oxidizing agent.

Thus from the above conclusion we can say that The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.

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Answer: 0.00152 km

Explanation:

when we convert 32.5 lb/in² to atmosphere, the result obtained is 2.21 atm

14.6959 lb/in² = 1 atm

14.6959 lb/in² = 1 atm

Therefore

32.5 lb/in² = 32.5 / 14.6959

32.5 lb/in² = 2.21 atm

Thus, 32.5 lb/in² is equivalent to 2.21 atm

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Ice cream that contains gelatin will have a thicker consistency than on that does not contain gelatin.

Gelatin is a proteoglycan which is made from boiling tendons.

Gelatin is used as a  thickening agent.

Therefore Ice cream that contains gelatin will have a thicker consistency than on that does not contain gelatin.

In conclusion, gelatin is used to thicken foods.

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The correct answer is A. A student thinks of bouncing balls as representing gas molecules.

When one effectiveness liquefies into another, a resolution is formed. A solution is a homogenous mixture consisting of a solute liquefied into a solvent. The solute is the substance that is being dissolved, while the solvent is the dissolving medium.

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The fact that uranium is a radioactive element is a chemical property. Details about radioactivity can be found below.

Radioactivity is the spontaneous emission of ionizing radiation as a result of a nuclear reaction.

Radioactivity, which is the emission of particles from an unstable nucleus, is a chemical property.

Therefore, it can be said that the fact that uranium is a radioactive element is a chemical property.

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Answer:

0.00152 km

Explanation:

The easiest way to complete the conversion is by (1) converting cm to m and then (2) converting m to km. It is important to arrange the conversions in a way that allows for the cancellation of units.

1,000 m = 1 km

100 cm = 1 m

152 cm             1 m                 1 km
-------------  x  --------------  x  ----------------  =  0.00152 km
                      100 cm          1,000 m

[tex]\large\displaystyle\text{$\begin{gathered}\sf So \to \ \ 152\not{cm}*\frac{1 \ km}{100,000\not{cm}}=0.00152 \ km \end{gathered}$}[/tex]

Answer:Therefore, the measurement of the object in km is: 0.00152 Kilometers.

I hope my answer is useful to you

The Percentage mass of NaCl is 1.78%.

The percent mass concentration of NaCl in the saline solution is determined from the molality of the solution.

The molality of the solution is further obtained from the freezing point depression formula.

The freezing point depression formula is given as follows:

where;

For the solution of NaCl;

ΔT = 0 - (-1.13) = 1.13

Kf = 1.86 °/m

i = 2

m = ΔT/(Kf * i)

m = 1.13/(1.86 * 2)

m = 0.3038 mol/kg

molar mass of NaCl = 58.5 g/mol

Mass of NaCl = 0.3038 * 58.5 = 17.8 g in

Percentage mass of NaCl = (17.8/1000) * 100

Percentage mass of NaCl = 1.78%

In conclusion, the percent mass of NaCl is obtained from the molality of the solution.

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There are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample. Details about number of molecules can be found below.

The number of molecules of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

According to this question, there are 2000g of ZnO in a sample. Zinc oxide has a molar mass of 81.38 g/mol.

no of moles = 2000g ÷ 81.38g/mol

no of moles = 24.57mol

number of molecules = 24.57 × 6.02 × 10²³

number of molecules = 147.95 × 10²³

Therefore, there are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample.

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51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.

To calculate the number of moles use the formula

Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]

                              = [tex]\frac{32.5}{17}[/tex]

                              = 1.9 mol

4NH₃ + 5O₂ → 4NO + 6H₂O

4 mol of NH₃ react with oxygen to given 6 mole of water.

So 1.9 mol of NH₃ produces = [tex]\frac{1.9}{4}\times 6[/tex]

                                              = 2.85 mol of water

Mass of water = Molar Mass of water × Number of moles of water

                        = 18 × 2.85

                        = 51.3 gram

Thus from the above conclusion we can say that 51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.

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Answer:

8 moles SO₂

Explanation:

To find the moles SO₂, you need to multiply the given value by the mole-to-mole ratio. This ratio, between O₂ and SO₂, is made up of the coefficients from the balanced equation.

2 H₂S + 3 O₂ -----> 2 SO₂ + 2 H₂O

12 moles O₂          2 moles SO₂
--------------------  x  ----------------------  =  8 moles SO₂
                               3 moles O₂

1. The most electronegative element is O (a)

2. The element that exhibits Greatest number of oxidation states is N (e)

3. The Smallest ionic radius for its most common ion is found for Mg (d)

1. Electronegativity is tendency of an atom to attract shared pair of electrons. Across a period, it increases from left to right while in a group, it decreases as we move down. The most electronegative elements are found in the top right of the periodic table because of the increase in effective nuclear charges. Hence, O is most electronegative element.

2. Oxidation state is the total number of electrons that an atom can either gain or loss to form a chemical bond. N exhibits a wide range of oxidation states from -3 to +5 because of half filled p orbital which is more stable.

3. Ionic radius is the radius of a monatomic ion in an ionic crystal structure. [tex]Mg^{2+}[/tex] has higher number of protons that will attract the negatively charged valence electrons to a greater extent hence shortening the distance.

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STEP 1: ON TREATING CHLOROETHANE WITH KCN WE GET PROPANE - NITRILE . STEP 2: ON TREATING PROPANE - NITRILE WITH LiAlH4 WE GET PROPANAMINE.

Answer:

particle C is more likely to participate in the reaction than particle B

The formula form of the chemical reactions are given as follows:

A chemical equation is an equation which uses the symbols of elements to show the reaction that occur between substances to form products.

The formula form of the chemical reactions are given as follows:

In conclusion, the chemical reactions are represented by the equations.

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Sodium bicarbonate and acetic acid are not good substitute for sodium azide in airbags since the require more mass and produce less gas.

The chemical equation for the production of nitrogen gas from sodium azide is given below:

1 mole or 66 go of sodium azide produces 3 moles or 67.2 L of nitrogen gas.

The equation for the production of carbon dioxide from sodium bicarbonate and acetic acid is given below:

1 mole, 106 g of Na₂CO₃ and 1 mole, 82 g of CH₃COOH are required to produce 1 mole or 22.4 L of CO₂.

The mass of sodium azide required is less than that of sodium bicarbonate and acetic acid required. Also, sodium azide produces a greater volume of gas. Therefore, sodium bicarbonate and acetic acid are not good substitute for sodium azide in airbags.

In conclusion, sodium azide is a better choice in airbags.

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Opinions are differ from facts as that we cannot change the facts but opinions can be changed as in first example it is given anthracite is better than bituminous coal may be there is another coal which is more better than anthracite. So here opinion is changed.

It is a black or brownish black sedimentary rock. It contains Sulphur, hydrogen, oxygen, carbon etc. It is always preferred as fuel. Coal was formed millions years ago when plant decay in the soil. It is obtained from dead vegetation. It is obtained from dead plants matter decay into peat and then it is converted into the coal by the process of heat.

Solar System is made up of all the planets that revolve around our Sun. Solar System contains eight planets. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Thus from the above conclusion we can say that Opinions are differ from facts as that we cannot change the facts but opinions can be changed as in first example it is given anthracite is better than bituminous coal may be there is another coal which is more better than anthracite. So here opinion is changed.

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Microfauna are measured in all of the above units and is denoted as option D.

These are referred to as microscopic animals which lack mitochondrion and exists in the soil etc. The nematodes  and protozoa are mostly common organisms among them.

Microfauna can be seen with the use of microscope and can be measured in centimeters, millimeters etc based on the size of their body structure.

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The correct option is (d) To express very large or very small number.

What is the Scientific Notation?

Scientific notation is a way to present numbers that are too large or too small to be easily written in decimal form. The three components of  scientific notation are coefficient, base and exponent. The proper format to write a scientific notation is a x 10^b, where a is a number or decimal number and b is the power of 10 to make scientific notation equivalent to original number. When a number between 1 and 10 is multiplied by a power of 10 then the number is expressed in scientific notation. For example,  10000000 can be written as 10⁷, which is the scientific notation and the exponent is positive here. Similarly, for the negative exponent 0.000001 can be can be represented as 10-⁷.                             Hence, the scientific notation is used to express very large or very small numbers.

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Answer:

539 mmHg

Explanation:

Using Boyle's Law,

(588)(924)=(1008)(pressure)

So, the pressure is 539 mmHg.

Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.

A Flame test is used to identify the metal and metalloid ion in the sample. Flame test is a qualitative test. Not every metal ion emit color when it is heated in the gas burner.

The purpose of flame test is used to find the identities of ions in two solutions of unknown composition by comparing the colors they produce.

Thus from the above conclusion we can say that Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.

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This is an exercise in the general or combined gas law.

To start solving this exercise, we must obtain the following data:

We use the following formula:

Where

We clear the general formula for the final pressure.

[tex]\large\displaystyle\text{$\begin{gathered}\sf P_{2}=\frac{P_{1}V_{1}T_{2} }{V_{2}T_{1}} \ \to \ Clear \ formula \end{gathered}$}[/tex]

We solve by substituting our data in the formula:

[tex]\large\displaystyle\text{$\begin{gathered}\sf P_{2}=\frac{(6.54 \ atm)(4.5 \not{l})(367 \not{K}) }{(2.3 \not{l})(306 \not{k})} \end{gathered}$}[/tex]

[tex]\large\displaystyle\text{$\begin{gathered}\sf P_{2}=\frac{10800.81}{ 703.8 } \ atm \end{gathered}$}[/tex]

[tex]\boxed{\large\displaystyle\text{$\begin{gathered}\sf P_{2}=15.346 \ atm \end{gathered}$} }[/tex]

If I raise the temperature to 94°C and decrease the volume to 2.3 liters, the pressure of the gas will be 15,346 atm.

Answer:

15.35 atm

Explanation:

Combined Gas Law

[tex]\sf \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

Temperature must be in kelvins (K).

To convert Celsius to kelvins, add 273.15.

Volume can be in any unit.

Given values:

Rearrange the equation to isolate P₂:

[tex]\sf \implies P_2=\dfrac{P_1V_1T_2}{V_2T_1}[/tex]

Substitute the given values into the equation:

[tex]\sf \implies P_2=\dfrac{6.54 \cdot 4.5 \cdot 367.15}{2.3 \cdot 306.15}[/tex]

[tex]\sf \implies P_2=15.34516967[/tex]

Therefore, the pressure of the gas will be 15.35 atm (2 d.p.).

Butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.

Carboxylic acids are converted to amides by converting them into into an ammonium salt which then produces an amide on heating.

The ammonium salt is prepared by adding ammonium carbonate to an excess of the acid. The ammonium salt is then heated to give the amide

Therefore, butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.

In conclusion, carboxylic acids are converted to amides in two steps.

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The correct option is (a) Availability of fish and furs. An incentive for profit to settle the Mississippi Valley region

Arkansas, Illinois, Iowa, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, Missouri, North Dakota, Tennessee, Wisconsin, and South Dakota are among the 13 states that are either entirely or partially included in the division of Mississippi Valley region

The canoe was the first ferry to travel on the Mississippi River. Long before the white settlers ventured as far west as the Mississippi, it provided the Indians with a means of crossing. It is also one of the most significant commercial waterways in the world and a key fish and bird migration route in North America. Native Americans used the river for transportation and food while they lived along its banks.

Therefore, The correct option is (a) Availability of fish and furs. An incentive for profit to settle the Mississippi Valley region.

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