Which of the following statements correctly describe the effect of molecular polarity on the behavior of a molecular compound?

a. The physical properties of a molecular compound are directly related to molecular polarity.
b. A polar compound will experience stronger intermolecular forces than a non polar compound.

Answer:

ffff

Explanation:

gram of NO=5

2NO = 2N+O2

2×2.50=x

x=5

The mass of nitrogen monoxide  produced from 2.5 grams of oxygen is 1.875 grams

4NH₃ + 50₂ → 4NO + 6H₂0

The limiting reagent is 0₂ because the least moles of this are used in the reaction.

Therefore, it will determine the amount of product formed.

From the chemical reaction above

10(16) g of 0₂ gives (4×14 + 4×16) g of NO

2.50 g of 0₂ will give ? of NO

cross multiply

mass of NO formed = 2.50 × 120 / 160

mass of NO formed = 300 / 160

mass of NO formed = 1.875 grams

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The mass of 0.8 cm³ of steel is 6.24 g.

mass = volume x density

Given that the density of steel is 7.8 g/cm³ and the volume of steel is 0.8 cm³, we can substitute these values into the formula and calculate the mass as follows:

mass = 0.8 cm³ x 7.8 g/cm³

mass = 6.24 g

Density is defined as the mass of a substance per unit volume. It is a physical property that can be used to identify and characterize different substances. The density of a substance is determined by dividing its mass by its volume. The unit of measurement for density is typically grams per milliliter (g/mL) or grams per cubic centimeter (g/cm³).

Density is an important property in many applications of chemistry, including material science, engineering, and environmental science. It can be used to determine the purity of a substance, to calculate the mass of a given volume of a substance, and to compare the properties of different materials. The density of a substance is affected by various factors such as temperature and pressure. For example, as the temperature of a substance increases, its density may decrease. Similarly, as the pressure on a substance increases, its density may also increase.

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Answer:

the principal energy level of an electron refers to the shell or orbital in which the electron is located relative to the atoms nucleus. the first element in a period of the periodic table introduces a new principal energy level.

Explanation:

the electrons surrounding an atom are located in region around the nucleus called "energy level".

The type of radiation is emitted when polonium-212 forms astatine-212 is alpha radiations.

When any unstable radioactive nuclei will emits any particle in the form of radiation to gain stability then the process is known as radioactive decay.

Polonium-212 is a unstable radioactive substance which will produces a daughter nuclei called astatine-212 through the radioactive decay, in which they emit the alpha particle in the form of radiations.

Hence the type of emitted radiation is alpha.

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Answer:

beta

Explanation:

i took the test this is the answer 100%

To prepare 0.250 M solution, the 0.0667 mol of KCl should be diluted up to 266.8mL

From the question,

We are to determine to what volume the KCl should be diluted, in order to prepare 0.250 M solution

From the formula,

Numer of  moles = Concentration × Volume

Then, we can write that

\(Volume= \frac{Number\ of\ moles}{Concentration }\)

From the given information,

Number of moles = 0.0667 mole

Concentration = 0.250 M

Then,

\(Volume = \frac{0.0667}{0.250}\)

Volume = 0.2668 L

Volume = 266.8 mL

Hence, to prepare 0.250 M solution, the 0.0667 mol of KCl should be diluted up to 266.8mL

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Answer:

The correct option is;

Cylinder A contains a gas that has a temperature closest to absolute zero

Explanation:

From the kinetic theory of gases, the average speed of a gaseous molecule is found from the following equation;

\(v_{rms} = \sqrt{\frac{3\cdot R \cdot T}{MW} }\)

Where:

\(v_{rms}\) = rms speed which is the square root of the average of the velocities of the gas molecules squared which is used in place of the average of the gas molecules as the sum of the velocities of all the gas molecules in the cylinder is zero

R = Universal gas constant = 8.3145 J/(mol·K)

MW = Molecular weight of the gas

Hence where we have;

\(v_{rmsA}\) = Average velocity of gas A = 0.0000001 m/s

\(v_{rmsB}\) = Average velocity of gas B = 0.3 m/s

Since, R and MW are constant for the gas in cylinder A constant, therefore, as \(v_{rmsA}\) ≈ 0 m/s, the temperature, \(T_A\), of gas A is closest to absolute zero.

Answer:

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.

Explanation:

Answer:

D

Explanation:

When an atom loses an electron the number of electrons exceeds the number of protons. This means that the negative charge induced by the electrons exceeds the positive charge induced by the protons.

The reaction that take place when active metals react with acids are:

Active metals are those metals which are very reactive and are found high above hydrogen in the activity series of metals.

The reactivity of metals is determined by the ability of the meta to give up electrons to form positive ions called cations.

Therefore, active metals are those metals that readily give up their electrons to form cations.

The active metals are found in the group 1A and 2A and 3A of the periodic table.

The active metals include; sodium, potassium, calcium, aluminum, magnesium, zinc etc.

The active metals react with dilute acids to displace hydrogen, resulting in the evolution of hydrogen gas.

Considering the given equations, the reactions of the active metals are:

Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)

Zn (s) + 2 HCl (aq) → ZnCl₂ (aq) + H₂ (g)

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Answer: Im not sure but I think it is false.

Explanation:

The automobile gasoline tank will hold 59.05 pounds of gasoline.

Given that the volume of the gasoline tank of the automobile is 19.0 gal. and the density of the gasoline is 0.737 g/mL. So, we need to calculate the number of pounds of gasoline the tank can hold.The relationship between volume and density is as follows;Density= Mass/ VolumeRearranging the equation gives; Mass= Density × VolumeSubstitute the given values in the above equation;Mass = 0.737 g/mL × 19.0 gal × 3.78541 L/galWe know that; 1 L = 1 dm³Thus,Mass = 0.737 g/mL × 19.0 gal × 3.78541 dm³/LMass = 53.70 kgThe given mass is in kg and we need to convert it into pounds;1 kg = 2.20462 poundsThus,Mass = 53.70 kg × 2.20462 pounds/kgMass = 118.4 pounds therefore, the automobile gasoline tank will hold 59.05 pounds of gasoline.

Given that the volume of the gasoline tank of the automobile is 19.0 gal. and the density of the gasoline is 0.737 g/mL. So, we need to calculate the number of pounds of gasoline the tank can hold.The relationship between volume and density is as follows;Density= Mass/ VolumeThe above equation can be rearranged as; Mass= Density × Volume Substitute the given values in the above equation;Mass = 0.737 g/mL × 19.0 gal × 3.78541 L/galMass = 53.70 kgThe given mass is in kg and we need to convert it into pounds;1 kg = 2.20462 poundsThus,Mass = 53.70 kg × 2.20462 pounds/kgMass = 118.4 pounds therefore, the automobile gasoline tank will hold 59.05 pounds of gasoline.

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Answer:

For most of its active life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. At the end of a star's lifetime, its core becomes a stellar remnant : a white dwarf , a neutron star , or, if it is sufficiently massive, a black hole .

Explanation:

Answer:

its nuclear fusion

Explanation:

The boiling point of the unknown liquid is 60°C or 333.15 K. The boiling point of a liquid is the temperature at which it changes state from a liquid to a gas.

In order to convert Fahrenheit to Celsius, we subtract 32 from the Fahrenheit temperature and multiply the result by 5/9.

The measurement of cold or heat with a thermometer is called temperature.

These units can be used to measure temperature:

The basic unit of thermodynamic temperature in the international system of units (S.I. unit) is the kelvin (K), which is equal to 1/273 the temperature of the triple point of water.

The metric unit of temperature, which derives from the International System of Units, is degrees Celsius.
To convert 138 °F to Celsius, we subtract 32 and then multiply by 5/9:
(138 - 32) x 5/9 = 60°C
To convert Celsius to Kelvin, we add 273.15 to the Celsius temperature:
60 + 273.15 = 333.15 K
The boiling point of the unknown liquid is 60°C or 333.15 K.

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Ka=5.3*10^(−11) By definition, Ka will be equal to Ka= [H3O+]*[A-]/[HA]Now use the pH of the solution to determine the equilibrium concentration of hydronium

We shall first ascertain the pKa of the solution before calculating the Ka. The pH of the solution and the pKa of the solution are equal at the equivalence point. As a result, we can quickly calculate the value of Ka using a titration curve and the equation Ka = - log pKa.

The ionisation constant (Ka) of formic acid can be calculated by the following formula;-

Ka = {[H+] * [HCOO-]} / [HCOOH]

Therefore you would need to know the value of each of the three concentration values on the right-hand side of the equation.

The equation for the dissociation of formic acid is;-

HCOOH ⇌ H+ + HCOO-

From this equation it can be seen that, at any degree of ionisation, the moles of H+ ions produced is equivalent to the moles of HCOO- ions. Therefore we can say that;-

[H+] = [HCOO-]

So, the equation for Ka in this case becomes;-

Ka = {[H+] * [H+]} / [HCOOH]

Ka = [H+]^2 / [HCOOH]

So, we have simplified our Ka formula down to two values, the H+ ion concentration [H+], and the concentration of undissociated formic acid [HCOOH]. To calculate the Ka for formic acid, we therefore need to either measure, or be given these values.

For example, if we started with a solution of formic acid which was 0.1M, we could measure its pH. Since pH = -log[H+], we could then calculate the H+ ion concentration and solve the Ka equation.

As it turns out the pH of a 0.1M formic acid solution is 2.38. Therefore, for this formic acid solution;-

-log([H+]) = 2.38

log([H+]) = -2.38

[H+] =10^(-2.38)

[H+] = 0.0042 M

Also, since formic is a relatively weak acid we can use the original solution concentration. i.e. [HCOOH] = 0.1M

Now we can solve the Ka equation we simplified above;-

Ka = [H+]^2 / [HCOOH]

Ka = (0.0042 )^2 / 0.1

Ka = 1.764 * 10^-4

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Characteristics of ionic compounds are

1. They develop crystals.

2. Both their melting and boiling points are very high.

3. They are fragile and hard.

4. Compared to molecular molecules, they have higher fusion and vapourization enthalpies. When dissolved in water, they act as an electrical conductor.

5. Ionic solids are excellent insulators because they do not conduct electricity.

An ionic compound in chemistry is a chemical complex made up of ions kept together by electrostatic forces known as ionic bonding. Although the molecule is mostly neutral, it contains positively charged ions known as cations and negatively charged ions known as anions.

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If terrestrial processes are responsible for the remaining Carbon for the net balance of the Carbon cycle, then the terrestrial surface is likely a net sink of 1.8 Gt of Carbon.

To determine this, we can calculate the net balance of Carbon in the terrestrial and ocean processes and then compare it to the increase in the atmosphere.

Terrestrial processes:-
Photosynthesis: +120 Gt
Decomposition: -60 Gt
Respiration: -60 Gt

Ocean processes:-
Uptake: +92 Gt
Release: -91 Gt

Anthropogenic sources:
Fossil fuel use and land use change: -6 Gt

Atmospheric increase: -3.2 Gt

The net balance of terrestrial processes: 120 - 60 - 60 = 0 Gt
The net balance of ocean processes: 92 - 91 = 1 Gt
The net balance of anthropogenic sources: -6 Gt

Now, we can add up the net balances and compare it to the atmospheric increase:-
0 + 1 - 6 = -5 Gt

Since the atmosphere is increasing by 3.2 Gt, there is a difference of 3.2 - (-5) = 8.2 Gt. The terrestrial processes are responsible for the remaining 8.2 - 1 = 7.2 Gt. However, we know the net balance of terrestrial processes is 0 Gt.

Therefore, the terrestrial surface must be a net sink of 1.8 Gt of Carbon (7.2 - 5.4 = 1.8 Gt) to achieve the net balance of the Carbon cycle.

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The reaction performed with the elephant toothpaste demonstration is known as a decomposition reaction.

The process of breaking down a chemical compound into smaller molecules, atoms, or ions is known as a decomposition reaction. It is also known as analysis or disintegration. A reaction in which a single substance is broken down into two or more simpler substances is known as a decomposition reaction. The elephant toothpaste demonstration is a simple chemical reaction in which hydrogen peroxide breaks down into oxygen gas and water in a matter of seconds.

The formula for hydrogen peroxide is H₂O₂. It is a pale blue liquid that contains hydrogen, oxygen, and water. When you add yeast, soap, and food coloring, the reaction is more exciting. The yeast acts as a catalyst, breaking down hydrogen peroxide into water and oxygen gas. The oxygen gas created causes the soap to foam up, creating the "elephant toothpaste" effect. The chemical reaction that takes place during the elephant toothpaste demonstration can be written as follows:

2H₂O₂(liquid) → 2H₂O (liquid) + O₂ (gas)

This reaction is an example of a decomposition reaction.

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The enthalpy of solution in this hypothetical case is -44.4 kJ/mol of solute.

To calculate the enthalpy of solution in kilojoules per mole of solute, we need to consider the enthalpy changes involved in the process. These include the separation of solute, the separation of solvent, and the formation of solute-solvent interactions.

Enthalpy of solution = (Enthalpy separation of solute) + (Enthalpy separation of solvent) + (Enthalpy formation of solute-solvent interactions)

Enthalpy of solution = (16.5 kJ/mol) + (24.8 kJ/mol) + (-85.7 kJ/mol)

Enthalpy of solution = -44.4 kJ/mol

This negative value suggests that the overall process of dissolving the solute in the solvent is thermodynamically favorable and releases energy. The enthalpy change of -44.4 kJ/mol indicates that the dissolution process is accompanied by a net release of 44.4 kJ of energy per mole of solute dissolved.

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The statement which is true about the subatomic particles within an atom is as follows:

Thus, the correct option is B.

Subatomic particles may be defined as those particles that significantly compose an atom. Such particles are generally smaller than atoms. In other words, it can be said that the subatomic particles are united together to form any atom.

Protons are positively charged subatomic particles that are found in the nucleus of an atom. Electrons are negatively charged subatomic particles that are significantly revolving around the nucleus of an atom.

Neutrons do not have any charge, they are neutral and are found in the nucleus of an atom along with protons.

Therefore, the correct option for this question is B.

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The balanced chemical equation between strong base and weak acid is represented as follows:

NaOH(aq)+ CH3COOH(aq)-----> CH3COONa(aq) + H2O(l)

When an acid reacts with a base, a salt is formed along with the formation of water, and this reaction is termed as neutralization reaction.

When a weak acid and a strong base are mixed, they react according to the following net-ionic equation: HA(aq) + OH⁻(aq) → A⁻(aq) + H₂O(l).

The balanced chemical equation between strong base and weak acid is represented as follows:

NaOH(aq)+ CH3COOH(aq)-----> CH3COONa(aq) + H2O(l)

Here, sodium hydroxide (NaOH) is a strong base and acetic acid (CH3COOH) is a weak acid.

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The mass in grams is 341 g.

A liquid's density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is dense if you weigh two liquids with similar volumes or amounts. A substance that is less dense than water will float if it is gently introduced to the water's surface.

The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimeter.

The density of the liquid (δ) = 1.24 g/ cm⁻³

The volume is given (V) = 275 mL

Therefore, the mass (m) = δ × V  ⇒ 1.24 g/cm⁻³ × 275 mL

→ 341 g.

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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Answer:

Percent yield = 47.6 %

Explanation:

Given data:

Mass of K₂CrO₄ react = 25.0 g

Mass of PbCrO₄ produced = 20 g

Percent yield of PbCrO₄ = ?

Solution:

Chemical equation:

K₂CrO₄ + Pb(NO₃)₂   →    PbCrO₄ + 2KNO₃

Number of moles of K₂CrO₄:

Number of moles = mass/molar mass

Number of moles = 25.0 g/ 194.19 g/mol

Number of moles = 0.13 mol

Now we will compare the moles of K₂CrO₄ and PbCrO₄ .

                       K₂CrO₄       :            PbCrO₄

                            1               :               1

                           0.13           :             0.13

Mass of PbCrO₄: Theoretical yield

Mass = number of moles × molar mass

Mass = 0.13 mol × 323.2 g/mol

Mass = 42.0 g

Percent yield:

Percent yield = ( actual yield / theoretical yield )× 100

Percent yield = (20 g/ 42.0 g ) × 100

Percent yield = 47.6 %

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Answer:

Explanation:

At constant pressure, the heat of reaction is equal to the enthalpy change of the system. Most chemical reactions occur at constant pressure, so enthalpy is more often used to measure heats of reaction than internal energy

For a chemical reaction, the heat of reaction, also known as enthalpy change (∆H), is equal to the difference between the total energy of the products and the total energy of the reactants.

Enthalpy change represents the amount of heat energy exchanged or released during the course of a reaction. The heat of reaction can be positive (endothermic), indicating that the reaction absorbs heat from the surroundings, or negative (exothermic), indicating that the reaction releases heat to the surroundings.

The magnitude of the heat of reaction is a measure of the amount of heat energy involved in the reaction.

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In a voltaic cell, the reaction that occurs at the cathode is the reduction reaction.

A voltaic cell consists of two half-cells, each containing an electrode (cathode or anode) and an electrolyte. In the cell, electrons flow from the anode to the cathode through an external circuit, generating electricity. At the cathode, reduction takes place as the positively charged ions in the electrolyte gain electrons, leading to a decrease in their oxidation state.

A voltaic cell, often called a galvanic cell, is an electrochemical device that produces electricity through uninhibited redox processes, both oxidation and reduction. It is divided into two distinct half-cells. A half-cell is made up of an electrode (a metal strip, M) dissolved in a solution containing Mn+ ions. M can be any metal. A wire from one electrode to the other connects the two half-cells cathode and anode. The half-cells are also connected by a salt bridge.

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