ionic compounds are formed from ionic bonds, whereby an electron is transferred from the metal cation to the nonmetal anion. ions form solid lattices of ions. covalent compounds form solids through the attraction of two covalent molecules. since the attraction between two covalent molecules is weak compared to the ionic bonds holding an ionic compound together, ionic compounds tend to have higher melting points. which of the following compounds has the highest boiling point? view available hint(s)for part c ionic compounds are formed from ionic bonds, whereby an electron is transferred from the metal cation to the nonmetal anion. ions form solid lattices of ions. covalent compounds form solids through the attraction of two covalent molecules. since the attraction between two covalent molecules is weak compared to the ionic bonds holding an ionic compound together, ionic compounds tend to have higher melting points. which of the following compounds has the highest boiling point? f2 naf hf clf

The compound octane is a hydrocarbon with the molar mass of 114.26 g/mol. It contains 8 carbon atoms and 18 hydrogens. Hence, the molecular formula is C₈H₁₈.

Hydrocarbons are organic compounds containing carbon -hydrogen bonds. Alkanes are saturated hydrocarbons with the general formula of CₙH₂ₙ₊₂.

Given the molar mass of octane  = 114.26 g/mol

mass of hydrogen = 18.17 g.

atomic mass of H = 1.009 g/mol

then, number of moles of H  = 18.17 /1.009 = 18 moles.

Thus, there are 18 hydrogens.

Now, the mass of carbons = 114.26 -18.17 = 96.6 g

atomic mass of carbon = 12 g/mol

no.of moles of carbon = 96.6/12 = 8 moles

Thus, there are 8 carbons.

Therefore, the molecular formula of octane is C₈H₁₈.

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Answer:

The correct option is (d).

Explanation:

It is given that,

1$ = 1500 pesos

We need to convert 360 pesos into dimes

We can convert 360 pesos to dollars as follows:

\(360\ \text{pesos}=\$\dfrac{1}{1500}\times 360\\\\=$0.24\)

360 pesos is equal to $0.24

Also, 1 dollar = 10 dimes

We can covert 0.24 dollar to dimes as follows :

0.24 dollar = 10 × 0.24 dimes

0.24 dollar = 2.4 dimes

or

360 pesos = 2.4 dimes

The spontaneity of a reaction is determined by the Gibbs free energy change (∆G), which is a measure of the system's ability to do work.

The equation that links ∆G, ∆H, and ∆S is: ∆G = ∆H - T∆S, where T is the temperature in Kelvin and ∆H and ∆S are the enthalpy and entropy changes, respectively. The signs of ∆H and ∆S determine whether the reaction is exothermic or endothermic and whether it is entropy-driven or enthalpy-driven, respectively.

If ∆G is negative, the reaction is spontaneous, meaning it occurs without the input of energy.The given reaction has a ∆H of 23.25 kJ and a ∆S of 161.26 J/mol∙K.

First, we need to convert the units of ∆S from J/mol∙K to kJ/mol∙K by dividing by 1000.∆S = 161.26 J/mol∙K ÷ 1000 = 0.16126 kJ/mol∙K Substitute the values into the equation to determine the spontaneity of the reaction:

∆G = ∆H - T∆S∆G = (23.25 kJ) - (298 K) x (0.16126 kJ/mol∙K)∆G = 23.25 kJ - 48.02 kJ∆G = -24.77 kJ Since ∆G is negative, the reaction is spontaneous.

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Answer:

1935J

Explanation:

Answer:

\(\boxed {\boxed {\sf C. \ 1935 \ J}}\)

Explanation:

The equation for this problem is:

\(q=mc\Delta T\)

where m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The mass is 3 kilograms, but the specific heat capacity includes grams in the units. Convert kilograms to grams. There are 1000 grams in 1 kilogram.

The specific heat capacity for lead is found on the table. It is 0.129 J/g°C.

Let's find the change in temperature. It is raised from 15 °C to 20 °C.

Now we know every value.

Substitute the values into the formula.

\(q= (3000 \ g)( 0.129 \ J/g \textdegree C)(5 \textdegree C)\)

Multiply the first 2 numbers together. The units of grams cancel.

\(q= (387 \ J/ \textdegree C )(5 \textdegree C)\)

Multiply again. This time the units of degrees Celsius cancel.

\(q= 1935 \ J\)

1935 Joules of energy are required and choice C is correct.

Answer:

50.63 cm³

Explanation:

Using Charles law equation as follows:

V1/T1 = V2/T2

Where;

V1 = initial volume (cm³)

V2 = final volume (cm³)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the question, V1 = 45.0 cm³, V2 = ?, T1 = 280 K, T2 = 315 K

Using; V1/T1 = V2/T2

45/280 = V2/315

Cross multiply

45 × 315 = 280 × V2

14175 = 280V2

V2 = 14175 ÷ 280

V2 = 50.625

V2 = 50.63 cm³

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 55.10 cm³

Density = 6.720 g/cm³

The mass is

mass = 55.10 × 6.720 = 370.272

We have the final answer as

Hope this helps you

The increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

Equilibrium is a state where the presence of base and acid is in equal quantity.

Increased pH, leads to more acidity and reduces the number of ions.

Ions are necessary for corals, oysters, mussels, and many other shelled organisms that require building their shells and skeletons.

Thus, increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

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Answer:

i think the first one is gravity and second one is rotation

Explanation:

The positive iodoform test indicates the presence of a methyl ketone or a compound that can undergo oxidation to form a methyl ketone. In the case of C5H8O, two geometric isomers that can give a positive iodoform test are trans-2-pentene-1-ol and cis-3-penten-2-ol. Here are their structures:

Trans-2-pentene-1-ol:

    H

    |

H - C = C - C - C - OH

    |    |

    H    H

Cis-3-penten-2-ol:

    H

    |

H - C = C - C - OH

    |    |

    H    H

Both of these isomers have the empirical formula C5H8O and can undergo oxidation to form a methyl ketone, which will react with iodine and hydroxide ions to produce a yellow precipitate of iodoform.

It's important to note that the structures provided are examples of geometric isomers that fit the given empirical formula and can give a positive iodoform test. The actual arrangement of atoms in space may vary depending on the specific isomer.

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Answer:

 6.022 × 10²³ units of that substance 

Explanation:

Yes, the % recovery will be impacted if you do not wait for the recovered crystals to dry before weighing them. The melting point, however, will not be affected.

When determining the % recovery of a substance, it is important to accurately measure the mass of the recovered product. If the crystals are not allowed to dry completely before weighing, they may still contain traces of moisture, which can add to their mass and lead to an overestimation of the recovery percentage.

Moisture can be absorbed from the surrounding environment, especially if the crystals are hygroscopic (have a tendency to attract and retain moisture).

To obtain an accurate % recovery, it is crucial to ensure that the crystals are completely dry before weighing them. This can be achieved by allowing them to air dry or using techniques such as vacuum drying or desiccation with drying agents.

On the other hand, the melting point of a substance is determined by the temperature at which it changes from a solid to a liquid state. The presence of moisture within the crystals, if not fully dried, may affect the melting point determination due to the vaporization of water at lower temperatures. However, once the crystals are completely dry, their melting point should remain unaffected.

In summary, while the % recovery can be impacted by not waiting for the crystals to dry before weighing, the melting point is not affected as long as the crystals are fully dry during the measurement.

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a. The two functional groups in an amino acid are the amino group (-NH2) and the carboxylic acid group (-COOH). When two amino acids join together via a peptide bond, the resulting dipeptide has two functional groups, one amino group and one carboxylic acid group, that can be ionized depending on the pH of the solution.

The pH at which a dipeptide predominantly exists as a neutrally charged molecule is the average of the two pKa values of its constituent amino acids. In this case, one amino acid has a pKa of 2.34 for the carboxylic acid group and a pKa of 9.60 for the amino group, while the other amino acid has a pKa of 2.20 for the carboxylic acid group and a pKa of 9.13 for the amino group.

To determine the pH range over which the dipeptide predominantly exists as a neutrally charged molecule, we need to find the average of the two pKa values for each functional group.

For the carboxylic acid group:

(pKa1 + pKa2) / 2 = (2.34 + 2.20) / 2 = 2.27

For the amino group:

(pKa1 + pKa2) / 2 = (9.60 + 9.13) / 2 = 9.37

Therefore, the pH range over which the dipeptide predominantly exists as a neutrally charged molecule is around pH 2.27 to pH 9.37.

b. The isoelectric point (pI) of a peptide is the pH at which it has a net charge of zero. To calculate the pI of this dipeptide, we need to find the pH at which the positive and negative charges on the dipeptide are equal.

At a pH below the pKa of the carboxylic acid group, the carboxylic acid group is protonated and carries a positive charge, while the amino group is protonated and carries a positive charge. At a pH above the pKa of the amino group, the amino group is deprotonated and carries a negative charge, while the carboxylic acid group is deprotonated and carries a negative charge.

Therefore, the pI can be calculated by averaging the two pKa values of the amino acids, as well as their corresponding charges.

pI = (pKa1 + pKa2) / 2 = (2.34 + 2.20 + 9.60 + 9.13) / 4 = 5.32

The isoelectric point of this dipeptide is 5.32.

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Answer:

b

Explanation:

The statement that is true about what can occur in a chemical change is b. Elements may combine to form compounds.

A chemical change can be described as the change which do take place when the substance's composition is been altered which could bring about the formation of another substance.

It should be noted that in the chimical change there is uaually a formation of a new product after one or more substance must have reacted together which implies that in this kind of change there is usuall a new substance that will be formed in the process.

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Answer:

A. its reactivity

Explanation:

It's reactivity because copper was exposed to air and if it is reactivity it must be exposed to air

Answer:

A.  reactivity

Explanation:

The  stationary metal sphere can have kinetic energy by: The metal's molecules are moving around.

When you find a substance's temperature, you are measuring the "average kinetic energy of the particles in the substance." Temperature is a measure of the average kinetic energy of the particles (atoms or molecules) that make up a substance.

Kinetic energy is the energy an object possesses due to its motion. It is defined as the energy that a body possesses by virtue of being in motion. The amount of kinetic energy that an object has depends on its mass and its velocity. Mathematically, the kinetic energy of an object can be expressed as KE = (1/2)mv^2, where KE is the kinetic energy, m is the mass of the object, and v is its velocity.

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1.553 atm  is the pressure of the air, in atm , in the lungs when the gas expands to 195.0 mL at a body temperature of 37 ∘C , and the amount of gas remains constant.

V1=95 ml

P1=2.90 atm

T1=282 K

V2=195 ml

T2=310 K

by applying ideal gas equation

P1V1÷T1=P2V2÷T2

P2=P1×V1×T2÷V2×T1

P2= 85405 ÷54990

P2=1.553 atm

The definition of pressure is force/area. For instance, the weight of the snow divided by the area of the roof would represent the pressure from snow on a roof. Gases are often where pressure in chemistry originates from. Vacuum is the term for the lack of pressure. Since "nature abhors a vacuum," humans have believed that vacuums are both impossible and unnatural for hundreds of years. This isn't really the case.

The amount of pressure units is insane! The torr or mmHg is a common unit. Simply put, this refers to the height of a mercury column. The atmospheric pressure is about 760 torr, or mmHg. You may also see mmH2O, which employs the same notion, but in this instance the atmospheric pressure is around 10.3 mH2O since water is less dense than mercury.

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The length of this radio wave is approximately 3.2 meters. So, the correct answer is option (C) 3.2 m.

The speed of light in a vacuum is approximately 3.00 x 10^8 m/s. The relationship between the frequency of a wave (f) and its wavelength (λ) is given by:

c = fλ

where c is the speed of light. Solving for the wavelength, we get:

λ = c/f

Substituting the given values, we get:

λ = (3.00 x 10^8 m/s)/(93.3 x 10^6 Hz)

λ = 3.22 meters

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The correct descriptions of a mole are:

a. Avogadro's number of items

b. 6.022 × \(10^2^3\) items

d. The amount of a substance containing the same number of formula units as there are atoms in 12 g of carbon.

a. Avogadro's number of items:

Avogadro's number is a fundamental constant in chemistry and is defined as the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 × \(10^2^3\) items. Therefore, option a correctly describes a mole as Avogadro's number of items.

b. 6.022 × \(10^2^3\) items:

This is the numerical value of Avogadro's number. As mentioned earlier, it represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. So, option b is another correct description of a mole.

c. Mass multiplied by acceleration:

This description does not accurately describe a mole. The product of mass and acceleration is a measure of force (Newton's second law of motion) and is unrelated to the concept of a mole in chemistry.

d. The amount of a substance containing the same number of formula units as there are atoms in 12 g of carbon:

This is a correct description of a mole. It refers to the concept of the molar mass, where one mole of a substance contains the same number of particles (atoms, molecules, ions, etc.) as there are atoms in 12 grams of carbon-12. This concept allows for the conversion between mass (in grams) and the number of moles.

So, the correct options are a, b, and d.

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Hydrogen bonds are (c) weak chemical bonds that hold separate molecules together.

Not to be confused with a covalent link to a hydrogen atom, hydrogen bonding is a unique form of dipole-dipole attraction that occurs between molecules. It comes about as a result of the attraction between two extremely electronegative atoms, such as N, O, or F, and a hydrogen atom that is covalently bound to one of them.

Although hydrogen bonds individually are weak and easily broken, they are present in very high quantities in water and organic polymers, where they combine to provide a powerful force. The DNA double helix is held together by hydrogen bonds as well.

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Answer:

water vapor (gas) is becoming liquid

Answer:

Explanation:

3× 22+2×32+ 6×16=

66+64+96=236

Answer:

4is the answer

Explanation:

There are approximately 1.5055 ×\(10^{23\) \(Na_2SO_4\)particles present in the solution.

To calculate the mass of anhydrous sodium tetraoxosulphate (VI) (\(Na_2SO_4\)) present in 500 cm3 of 0.5 M solution, we can use the equation:

Mass (g) = Volume (L) × Concentration (M) × Molar mass (g/mol)

First, let's convert the volume from cm3 to L:

500 cm3 = 500/1000 L = 0.5 L

Next, we can substitute the values into the equation:

Mass = 0.5 L × 0.5 mol/L × (2 × 23 g/mol + 32 g/mol + 4 × 16 g/mol)

= 0.5 × 0.5 × (46 + 32 + 64)

= 0.5 × 0.5 × 142

= 35.5 g

Therefore, the mass of anhydrous sodium tetraoxosulphate (VI) present in 500 cm3 of 0.5 M solution is 35.5 g.

For 1b, to calculate the number of \(Na_2SO_4\)particles present in the solution, we can use Avogadro's number (6.022 ×\(10^{23\) particles/mol) and the number of moles of Na2SO4.

The number of moles of Na2SO4 can be calculated using the formula:

Moles = Concentration (M) × Volume (L)

Moles = 0.5 mol/L × 0.5 L

= 0.25 mol

Now we can calculate the number of \(Na_2SO_4\)particles:

Number of particles = Moles × Avogadro's number

= 0.25 mol × 6.022 ×\(10^{23\) particles/mol

= 1.5055 × \(10^{23\) particles

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Answer:

1.8 * 10^24 atoms

Explanation:

n = M(B) / m = 10.8 / 3.60 = 3 mol

N = n * Na = 3 * 6*10^23 = 1.8 * 10^24 atoms

C. The y, or vertical, intercept is the weight of the empty beaker.

When determining the density of a liquid, it is important to use a specific container to hold the liquid. In this case, a 250-ml beaker was used. The method used to determine the density involves weighing 25, 50, 75, 100, and 125 mL of the liquid in the beaker. By plotting the volume of liquid along the horizontal axis and the total mass of beaker plus liquid on the vertical axis, it is possible to analyze the results. Option a is incorrect, as the x-intercept does not represent the weight of the beaker. It is important to note that the beaker's weight should be measured and subtracted from the total mass obtained from the experiment. Option b is also incorrect because the slope of the line is dependent on the identity of the liquid being used.
Option c is correct, as the y-intercept represents the weight of the empty beaker. This value is crucial in determining the total mass of the liquid. Finally, option d is incorrect because the line will not pass through the origin, and option e is also incorrect because the slope of the line will vary depending on the identity of the liquid. In summary, the correct answer is c.

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One of the products of this reaction is solid tin(II) carbonate (SnCO₃).

When aqueous sodium carbonate (Na₂CO₃) reacts with aqueous tin(II) nitrate (Sn(NO₃)₂), a double-replacement reaction takes place. The balanced chemical equation for the reaction is,

Na₂CO₃(aq) + Sn(NO₃)₂(aq) → SnCO₃(s) + 2NaNO₃(aq)

In this reaction, the sodium ion and nitrate ion from the sodium carbonate and tin(II) ion and nitrate ion from the tin(II) nitrate switch places to form solid tin(II) carbonate and aqueous sodium nitrate.

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Answer:

The only relationship is that the larger the mass of an object the more gravitational force it has. So... something that has more mass has more gravity. The mass of 4.2kg of gold when transferred to this new planet is still 4.2kg. However, the WEIGHT (not mass) is now doubled to 8.4kg. Mass is constant it is how much matter something is made up of. Weight depends on the gravitational force. Moreover, I would look at other answers too (I'm not entirely confident of saying that the weight is 8.4kg since I don't have any gravitational equations in front of me it just sounds logical).

Explanation:

Answer: i believe it would be A

Answer:

a and d

Explanation:

Answer:

78.04g of 0.448 moles must be added

Explanation:

Using H-H equation we can find the pH of the buffer:

pH = pKa + log [A⁻] / [HA]

Where pH is the pH of the buffer = 7.2

pKa = 7.1

[A⁻] = [K₂HPO₄]

[HA] = [KH₂PO₄]

Replacing:

7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]

0.1 = log [K₂HPO₄] / [KH₂PO₄]

1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)

And as the  concentration of the buffer is:

1M = [K₂HPO₄] + [KH₂PO₄] (2)

Replacing (2) in (1):

1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]

1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]

2.2589 [KH₂PO₄] = 1M

[KH₂PO₄] = 0.44M

And [K₂HPO₄] = 0.56M

In 800mL = 0.8L:

0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:

0.448 moles * (174.2g / mol) =

Answer:

Explanation:

pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.

In order to find the pH we use the formula;

\( \bold{pH = -log([{H_3O}^{+}])} \)

From the question

\( [{H_3O}^{+}]\) = \( {1.7 \times 10}^{-3} \: M \)

We have

\( pH = -log({1.7 \times 10}^{-3}) \\ = 2.769555 \)

We have the final answer as