If the solubility of potassium nitrate (KNO3) is 320 g/dm3, how much potassium nitrate can be dissolved in 16 cm3 of water?

A. 0.05 grams
B. 304 grams
C. 5.12 grams
D. 20 grams

Final answer:

The molecular orbital theory of bonding involves the combination of atomic orbitals to form molecular orbitals that can extend over multiple atoms, leading to the formation of stabilized and destabilized regions in a molecule depending on the phase of orbital combinations. So the correct option is A.

Explanation:

The molecular orbital theory of bonding is best described by option A: A theory of bonding based on the mixing of atomic orbitals of similar shapes and energies to form molecular orbitals that extend over two or more atoms. This theory utilizes quantum mechanics to describe how electrons are distributed in a molecule, leading to the formation of bonding and antibonding molecular orbitals. Bonding molecular orbitals, which are in-phase combinations of atomic wave functions, stabilize a molecule, while antibonding molecular orbitals, resulting from out-of-phase combinations, make a molecule less stable. Molecular orbitals can incorporate atomic 's' and 'p' wave functions to form σ and π orbitals, respectively. A molecular orbital can hold up to two electrons with opposite spins, analogous to atomic orbitals in isolated atoms.

Answer:

3.5 moles Fe

Explanation:

From the equation, Reaction of 2 moles of Fe₂O₃ with  1 mole of C produces 1 mole of Fe. When excess Fe₂O₃ is used, the only liming factor is C.

The ratio of amount of C used to the amount of Fe produced is 1:1

Therefore, if 3.5 moles of C are used,  3.5 moles of Fe are also produced.

Answer:

number 2 is correct

Explanation:

Among the options you provided, the correct answer for the cause of tornadoes is option 1: cool, dry air meeting warm, moist air.

Tornadoes typically form in severe thunderstorms where there is a significant clash between different air masses. The interaction of cool, dry air and warm, moist air sets up the conditions necessary for tornado development. This collision can create instability in the atmosphere, leading to the formation of a rotating column of air that extends from the base of a thunderstorm cloud to the ground.

Among the options you provided, the correct answer for the cause of tornadoes is option 1: cool, dry air meeting warm, moist air.

The correct option is 1.

Learn more about tornado

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Answer:

[tex]\boxed{\text{Mg + 2Cl $\longrightarrow$ MgCl$_{2}$}}[/tex]

Explanation:

Convert the word equation to a chemical equation.

one atom magnesium + two atoms Cl form magnesium chloride

                Mg               +          2Cl           ⟶             MgCl₂

Answer:

Option E is correct.

Explanation:

An atom of magnesium and two atoms of chloride react and yield the compound of magnesium chloride

Mg + 2Cl -> MgCl₂

Therefore, the correct option is the option E.

Option A shows the decomposition of MgCl₂ to two Mg atom and 1 Cl atom. The reaction is unbalanced. The question has asked for the formation of MgCl₂. Option A is incorrect.  

Similarly, option C shows the decomposition of MgCl₂, however, the reaction is balanced. Option C is incorrect.

Option B is incorrect as there are 2 Cl atoms on the reactant side but no Mg atom.  

Option D is incorrect as there only 1 Mg atom on the reactant side but no Cl atoms.  

Answer:

[tex]\boxed{\text{3A + 2D $\longrightarrow$ 2C + F}}[/tex]

Explanation:

Add the two elementary reactions, cancelling species that occur on each side of the equation

3A             ⟶ B + C

    B + 2D ⟶        C + F

3A    + 2D ⟶     2C + F

The overall reaction is [tex]\boxed{\textbf{3A + 2D $\longrightarrow$ 2C + F}}[/tex]

The overall mechanism of the given reactions is 3A + 2D → 2C + F.

The overall reaction is determined by adding the elementary reactions together and then cancelling out any species that appear on both sides of the reaction. Here, the two elementary steps given are: 3A→B+C and B+2D→C+F. Adding these two reactions gives: 3A + B + 2D → B + C + C + F. Cancel out the 'B' on both sides to get the overall reaction: 3A + 2D → C + C + F, simplified as 3A + 2D → 2C + F.

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Answer:

Option B is correct

Explanation:

The ideal gas formula can be used to find the Pressure of Nitrogen gas.

[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]

Here P is pressure, V is volume and T is temperature.

In the given question:

P₁ = 1.7 kPa

T₁ = -10°C Changing to Kelvin:  273.15 -10°C = 263.15 K

V₁ = 7.5 m^3

V₂ = 3.8 m^3

T₂ = 200 K

P₂ =?

Putting values in the formula

[tex]\frac{1.7 *7.5 }{263.15}=\frac{P_{2*3.8}}{200}\\\frac{12.75}{263.15}=\frac{P_{2}*3.8}{200} \\0.048 = \frac{P_{2}*3.8}{200}\\=> P_{2} = \frac{0.04845*200}{3.8}\\P_{2} = 2.55 \,\,kPa\\[/tex]

So, Option B is correct.

Answer:

B.) 2.55 kPa

Explanation:

I got it correct on founders edtell

Answer:

A

Explanation:

According to Coulomb's Law, like charges repel each other, whereas unlike charges attract each other. This applies to all charged particles.

When NaCl dissociates into its ions in water, we observe the following ions in the system:

Na+ (positive)

Cl - (negative)

H+ (positive)

OH- (negative)

The only correct option is A where the negatively charged oxygen atoms are attracted to the positively charged sodium atoms.

In option B the charge of the oxygen atom is incorrectly mentioned as positive. In option C, the charge of hydrogen atoms is incorrectly mentioned as negative, and in option D the charges of the atoms are correct, but the pairing is incorrect as like charges repel each other.

Answer:

D. Positively charged hydrogen atoms are attracted to positively charged sodium atoms.

Explanation:

Founder Education

An ethical vacuum is when technology has created something for which we do not have an ethical framework yet. That is option C.

An ethical vacuum can be defined as the development of a structure by technology which lacks ethical framework backup.

Before a new innovation is approved in the society, it needs to be given an ethical backup to be fully assimilated into the society at large.

Therefore, an ethical vacuum is can be defined as when technology has created something for which we do not have an ethical framework yet.

Learn more about ethics here:

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Answer:

B.) The drug gets carried through a stationary phase by a mobile phase and the retention time identifies the drug.

Explanation:

Chromatography is used in purifying complex mixtures of organic compounds. It uses the adsorption tendencies of compounds to seperate and identify them.

Chromatography is made up of two phases in contact, the stationary phase or non-mobile phase and the mobile phase. The movement of the mobile phase over the stationary phase causes the separation of a mixture into its constituents.

The stationary phase is made up of silica-gel or alumina in a solvent (an adsorbent) and the mobile phase or carrier is the organic solvent which is the drug.

Thin-layer chromatography is based on the separation of compounds as they move at different rates through a stationary phase under the influence of a mobile phase, due to their interactions with the stationary material.

The basis of thin-layer chromatography (TLC) is the separation of compounds based on their differing rates of movement through a stationary phase, typically a slurry of solid beads of silica or a solid surface of these compounds, under the influence of a mobile phase. The substances are first dissolved in the mobile phase, and as the mobile phase moves through the stationary phase, the components of the mixture interact with the stationary phase to various extents. These interactions can result in different retention times, which are the times that solutes remain in the chromatography system before eluting. As a result, components with different chemical properties can be separated and identified.

TLC is characterized by its use of a stationary phase and a mobile phase, and relies on the physical and chemical interactions between the solute and these phases for separation. Compounds with different affinities for the stationary and mobile phases travel at different speeds, resulting in their separation.

Answer:

Explanation:

The solution involves the law of conservation of energy and the equation for heat, Q:

Due to technichal problems with the editor, I attach the complete explanation in a pdf document.

Please, click on the image of the file to open it and see the full explanation.

To find the final equilibrium temperature of the copper and water, we can use the principle of conservation of energy. The heat gained by the water will be equal to the heat lost by the copper. We can use the equation: mass of copper × specific heat capacity of copper × (final temperature - initial temperature of copper) = mass of water × specific heat capacity of water × (final temperature - initial temperature of water). Solving this equation will give us the final equilibrium temperature of the copper and water.

To find the final equilibrium temperature of the copper and water, we can use the principle of conservation of energy. The heat gained by the water will be equal to the heat lost by the copper. We can use the equation:

mass of copper × specific heat capacity of copper × (final temperature - initial temperature of copper) = mass of water × specific heat capacity of water × (final temperature - initial temperature of water)

Plugging in the given values:

0.250 kg × 0.385 kJ/kg°C × (final temperature - 100°C) = 0.370 kg × 4.18 kJ/kg°C × (final temperature - 30°C)

Solving this equation will give us the final equilibrium temperature of the copper and water.

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Answer:

Choice a. The compound name is alphabetized incorrectly.

The correct IUPAC name of this compound should be:

4-ethyl-2,2-dimethylheptane.

Explanation:

Draw the carbon backbone structure for "2,2-dimethyl-4-ethylheptane":

[tex]\begin{array}{ccccccccccccc}& &\text{C}\\& & |\\\text{C}&-&\text{C}&-&\text{C}&-&\text{C}&-&\text{C}&-&\text{C}&-&\text{C}\\&&|&&&&|\\&&\text{C}&&&&\text{C}\\&&&&&&|\\&&&&&&\text{C} \end{array}[/tex].

The seven-carbon backbone is indeed the longest chain in this compound.

[tex]\begin{array}{ccccccccccccc}& &\text{C}\\& & |\\\text{C}^1&-&\text{C}^2&-&\text{C}^3&-&\text{C}^4&-&\text{C}^5&-&\text{C}^6&-&\text{C}^7\\&&|&&&&|\\&&\text{C}&&&&\text{C}\\&&&&&&|\\&&&&&&\text{C} \end{array}[/tex].

Numbering from the end with the two methyl groups indeed minimizes the number on each group. However, the alphabetical order of the groups is not correct. There are two kinds of substitute groups in this compound:

The name for them will be

Ignore the multiplier prefixes (di-, tri-, etc.) while alphabetizing.

The ethyl group shall be placed before the two methyl groups. The name of the compound shall be:

4-ethyl-2,2-dimethylheptane.

Answer:

It's a.

Explanation:

The substituents are not in alphabetical order.  The ethyl substituent should come before the dimethyl ( Note the prefix  'di' is ignored).

The correct name is 4-ethyl-2,2-dimethylheptane.

Answer:

Explanation:

1) Chemical equation (unbalanced)

2) Balanced chemical equation:

3) Mole ratio:

4) Volume ratio:

Since the reaction is carried out at constant pressure and temperature, the volume ratios are equal to the mole ratios. Then:

Hence, 1.00 liter of CO gas produces 1.00 liter of CO₂

3) Mass of carbon dioxide:

a) Use ideal gas equation to convert 1.00 liter CO₂ produced to moles:

b) Convert moles to mass in grams

Answer:

1.00L

1.96G

0.500mol

0.750mol

16.8L

Explanation:

Answer:

The ratio of half-lives for a reaction with starting concentrations of 0.05M and 0.01M, t1/2 (0.05M) / t1/2 (0.01M) = 1, if a reaction is known to be first order.

Explanation:

the half-life of the reaction is constant and does not depend on the value of the initial concentration.

half-life (t1/2) = 0.693/k,

where, k is the rate constant of the reaction.

So, half;life of first-order reaction is constant whatever the initial concentration.

So the ratio of t1/2 (0.05M) / t1/2 (0.01M) = 1

Hey there!

I can't be sure my answers are the exact words, but it should be something along the lines of...

The amount of water on Earth is constant, but the form and location of the water changes as it moves through the water cycle.

This means that Earth has always had the same amount of water within in, along with it being the same water the whole time. No new water was introduced to our planet. Some of our water is liquid, some is solid, and some is gas. Some is deep in the soil and some is high up in the atmosphere. Some is in rain and some is in snow.

I hope this helps!

Answer:

Mix 50 mL of the 68% solution with 40 mL of the 77% solution to make 90 mL of the 72% solution.

Explanation:

Let the volume required of the 68% solution be [tex]x[/tex] mL. The volume of the 68% solution and the 77% solution shall add up to 90 mL. Thus the volume required of the 77% solution shall be [tex](90- x)[/tex] mL.

The amount of solute in the 72% solution will be:

[tex]90\times 72\% = 64.8[/tex].

The [tex]x[/tex] mL of the 68% solution will contribute:

[tex]68\% \cdot x = 0.68\;x[/tex].

The [tex](90- x)[/tex] mL of the 77% solution will contribute:

[tex]77\% \cdot x = 0.77\;(90 - x) = 69.3 - 0.77\;x[/tex].

The two values shall add up to [tex]64.8[/tex]. That is:

[tex]0.68\;x + 69.3 - 0.77\;x = 64.8[/tex].

[tex]-0.09\;x = -4.5[/tex].

[tex]\displaystyle x = \frac{4.5}{0.09} = 50[/tex].

In other words, there need to be

Answer:

2.35.

Explanation:

∵ pH = - log[H⁺].

[H⁺] = 4.5 x 10⁻³ M.

∴ pH = - log(4.5 x 10⁻³ M) = 2.346 ≅ 2.35.

Answer:

[tex]\boxed{\text{2.02 g F}}[/tex]

Explanation:

You get 2.56 g of F with 1.66 g of Mg.

[tex]\text{Mass of F} = \text{ 1.31 g Mg} \times \dfrac{\text{2.56 g F}} {\text{1.66 g Mg}} = \boxed{\textbf{2.02 g F}}[/tex]

Answer: The mass of fluorine produced in sample 2 will be 2.02 grams

Explanation:

The chemical formula of magnesium fluoride is [tex]MgF_2[/tex]

We are given:

Mass of magnesium in sample 1 = 1.66 grams

Mass of fluorine in sample 1 = 2.56 grams

Mass of magnesium in sample 2 = 1.31 grams

Applying unitary method:

When 1.66 grams of magnesium is produced, the mass of fluorine produced is 2.56 grams

So, when 1.31 grams of magnesium will be produce, the mass of fluorine produced will be = [tex]\frac{2.56}{1.66}\times 1.31=2.02g[/tex]

Hence, the mass of fluorine produced in sample 2 will be 2.02 grams

Answer:

27.055 (°C)

Explanation:

the final temperature of the water and the aluminium has the same value: the aluminium block lost the heat, the water 'takes' the heat.

All the details are in the attached picture, the answer is marked with green.

2 C2H6(g) + 10O2 >4 CO2(g) + 6 H20

whixh equals

C4 H12 +O20 > C4O8(g) + H12O12

C4=C4

H12=H12

O20=O20

balanced

Final answer:

To balance the combustion of ethane, the final balanced equation with integer coefficients is 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O.

Explanation:

The combustion of ethane (C₂H₆) with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O) can be balanced by following these steps:

The balanced chemical equation for the combustion of ethane with integer coefficients is: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O.

Answer:

Explanation:

All atoms of a same element have equal number of protons (atomic number) but may differ in the number of neutrons.

The atoms that differ in the number of neutrons are named isotopes.

For example: carbon-12 and carbon-13 are diferent isotopes of the same element, carbon. They have the same number of protons (6, which is the atomic number of carbon). On the other hand, while carbon-12 has 6 neutrons, carbon-13  has 7 neutrons.

As per the other choices: