in a set of experiments on a hypothetical one-electron atom, you measure the wavelengths of the photons emitted from transitions ending in the ground level (nn

The volume in which the weather ballon bursts is 640.21L.

The volume of a gas given the temperature and pressure can be calculated using the combined gas law as follows:

PaVa/Ta = PbVb/Tb

Where;

According to this question, a weather balloon is filled with 28.6 L helium at sea level where the pressure is 1.00 atm at 20.0 °C.

1 × 28.6/293 = 0.034 × Vb/223

0.0976109215 × 223 = 0.034Vb

Vb = 21.767 ÷ 0.034

Vb = 640.21L

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Answer:C

Explanation:I took the test

Answer:

It is a south pole because the field lines enter the magnet at this end.

Explanation:

Answer:

before

Explanation:

Answer:

Does evaporation happen before of after condensation?

Explanation:

Condensation, the opposite of evaporation, occurs when saturated air is cooled below the dew point (the temperature to which air must be cooled at a constant pressure for it to become fully saturated with water), such as on the outside of a glass of ice water.

Or

Heat (energy) is necessary for evaporation to occur. Condensation, the opposite of evaporation, occurs when saturated air is cooled below the dew point (the temperature to which air must be cooled at a constant pressure for it to become fully saturated with water), such as on the outside of a glass of ice water.

the density of the proton is 3.2×10−11g/cm3 3.2 × 10 − 11 g / c m 3 . if Calculate the density of a proton, given that the mass of a proton is 1.0073 amu.

Density is the measure of how much “stuff” is in a given amount of space. For example, a block of the heavier element lead (Pb) will be denser than the softer, lighter element gold (Au). A block of Styrofoam is less dense than a brick.

Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass).

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(a) Element C (2,8,8) is unlikely to react with the others.

(b) Elements D (2,8,7) and E (2,8,3) will likely react to form covalent compounds.

(c) Elements A (2,8,2) and B (2,8,6) will likely react to form ionic solids.

(a) It has a complete outer electron shell (valence shell) with eight electrons, fulfilling the octet rule. This stable configuration makes element C less likely to undergo chemical reactions and form compounds.

(b) Covalent compounds involve the sharing of electrons between atoms, typically nonmetals. Both D and E have incomplete outer electron shells and can form covalent bonds by sharing electrons with other elements.

(c) Ionic compounds involve the transfer of electrons from one atom to another, typically between metals and nonmetals. When A and B form ionic solids, they will achieve a stable electron configuration by losing or gaining electrons, respectively.

Element A would lose two electrons to achieve a stable configuration, resulting in a valency of +2. Element B would gain two electrons, resulting in a valency of -2.

The weakest bond among ionic, covalent, and hydrogen bonds is the hydrogen bond. Hydrogen bonds are relatively weaker than ionic and covalent bonds. They occur when a hydrogen atom with a partial positive charge interacts with an electronegative atom, such as oxygen or nitrogen, with a partial negative charge.

Hydrogen bonds are important in various biological and chemical processes, but they are weaker compared to the strong bonds formed in ionic and covalent compounds.

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Answer:

C. C and Pb

Both are in group IV elements.

Answer:

Molecular formula for the gas is: C₄H₁₀

Explanation:

Let's propose the Ideal Gases Law to determine the moles of gas, that contains 0.087 g

At STP → 1 atm and 273.15K

1 atm . 0.0336 L = n . 0.082 . 273.15 K

n = (1 atm . 0.0336 L) / (0.082 . 273.15 K)

n = 1.500 × 10⁻³ moles

Molar mass of gas = 0.087 g / 1.500 × 10⁻³ moles = 58 g/m

Now we propose rules of three:

If 0.580 g of gas has ____ 0.480 g of C _____ 0.100 g of C

58 g of gas (1mol) would have:

(58 g . 0.480) / 0.580 = 48 g of C  

(58 g . 0.100) / 0.580 = 10 g of H

 48 g of C / 12 g/mol = 4 mol

 10 g of H / 1g/mol = 10 moles

The molecular formula of the compound is C4H10.

At STP;

P = 1 atm

T = 273 K

V = 33.6 mL or 0.0336 L

R = 0.082 atmLK-1mol-1

n = ?

Hence;

n = PV/RT

n = 1 atm × 0.0336 L/0.082 atmLK-1mol-1 × 273 K

n = 0.0015 moles

Number of moles = mass/molar mass

Molar mass= Mass/Number of moles

Molar mass = 0.087 g/0.0015 moles

Molar mass = 58 g/mol

Mass of carbon = (58 g × 0.480) / 0.580 = 48 g of C  

Mass of hydrogen = (58 g × 0.100) / 0.580 = 10 g of H

Number of moles of carbon = 48 g of C / 12 g/mol = 4 mol

Number of moles of hydrogen = 10 g of H / 1g/mol = 10 moles

Formula of the compound must then be C4H10.

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Answer: Through photosynthesis carbon dioxide and water is converted to glucose which is more ordered.

Explanation:

Besides that initial consideration there is solar energy being added to the reaction which might be worth noting.

More important to note is that organic molecules/compounds such as glucose are higher in order compared to inorganic molecules/compounds such as water.

Answer:

meander

Explanation:

A meander is the the “winding” shape that a river can take.  It is  is one of a series of regular sinuous curves, bends, loops, turns, or windings in the channel of a river, stream, or other watercourse(wikipedia).

A meander is formed when water in the river erodes the banks just outside its channel. The water then deposits some sediments inside the channel.

Answer:

The correct answer is D., or "meander".

A satellite terminates one revolution of a planet in one hour. At the end of one hour, the satellite has moved 2.0 x 10⁷ meters and is only 10 meters away from its starting point. After one hour, the average velocity of the satellite is 2.7 × 10 ⁻² m/s.

Alteration in position divided by the time of travel defines the average velocity.

Given:

Distance = 2.0 x 10⁷ meters

Time = 1 hour

Average speed is calculated as:

Average speed = distance covered by the object ÷ Time to cover the distance

= 2.0 x 10⁷ ÷ 1

= 2.0 x 10⁷ meters ÷ hour

= 5,555 and 5/9 meters/second.

Now,

The term velocity is defined as the ratio of displacement to the time for the displacement.

Velocity = Displacement / Time

= 10 meters/hour

= 0.002777 meters/second

= 2.7 × 10 ⁻² m/s

Thus, 2.7 × 10 ⁻² m/s is the satellite's average velocity after one hour.

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The strand 1 of hydrocarbons is used to produce plastic, hence option D is correct.

Raw resources like natural gas, oil, or plants that have been processed into ethane and propane are used to make plastics. The subsequent "cracking" procedure uses heat to transform ethane and propane into ethylene and propylene. To produce various polymers, these components are mixed.

Propylene is a substance found in large quantities in petroleum. In order to speed up chemical processes, refiners combine heated propylene with a catalyst to create plastic. Propylene molecules start to cluster together like beads on a thread as a result.

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Answer:

10.66  grams

Explanation:

Answer:

The answer is D

Explanation:

because insecticides are used for insects but pesticides are used to kill off unwanted plants

Answer:

B. herbicides

Explanation:

it kills weeds.

Answer:

\(0.175\; \rm mol \cdot L^{-1}\).

Explanation:

Magnesium chloride and silver nitrate reacts at a \(2:1\) ratio:

\(\rm MgCl_2\, (aq) + 2\, AgNO_3\, (aq) \to Mg(NO_3)_2 \, (aq) + 2\, AgCl\, (s)\).

In reality, the nitrate ion from silver nitrate did not take part in this reaction at all. Consider the ionic equation for this very reaction:

\(\begin{aligned}& \rm Mg^{2+} + 2\, Cl^{-} + 2\, Ag^{+} + 2\, {NO_3}^{-} \\&\to \rm Mg^{2+} + 2\, {NO_3}^{-} + 2\, AgCl\, (s)\end{aligned}\).

The precipitate silver chloride \(\rm AgCl\) is insoluble in water and barely ionizes. Hence, \(\rm AgCl\!\) isn't rewritten as ions.

Net ionic equation:

\(\begin{aligned}& \rm Ag^{+} + Cl^{-} \to AgCl\, (s)\end{aligned}\).

Calculate the initial quantity of nitrate ions in the mixture.

\(\begin{aligned}n(\text{initial}) &= c(\text{initial}) \cdot V(\text{initial}) \\ &= 0.25\; \rm mol \cdot L^{-1} \times 0.150\; \rm L \\ &= 0.0375\; \rm mol \end{aligned}\).

Since nitrate ions \(\rm {NO_3}^{-}\) do not take part in any reaction in this mixture, the quantity of this ion would stay the same.

\(n(\text{final}) = n(\text{initial}) = 0.0375\; \rm mol\).

However, the volume of the new solution is twice that of the original nitrate solution. Hence, the concentration of nitrate ions in the new solution would be \((1/2)\) of the concentration in the original solution.

\(\begin{aligned} c(\text{final}) &= \frac{n(\text{final})}{V(\text{final})} \\ &= \frac{0.0375\; \rm mol}{0.300\; \rm L} = 0.175\; \rm mol \cdot L^{-1}\end{aligned}\).

2ZnS + 3O2 → 2ZnO + 2SO2

Find the limiting reagant :

n ZnS = m ZnS / Mr ZnS

n ZnS = 11.27 / 97

n ZnS = 0.116 mole

n O2 = m O2 / Mr O2

n O2 = 6.97 / 32

n O2 = 0.218 mole

n O2 / coef. O2 > n ZnS / coef. ZnS

So ZnS is the limiting reagant

Calculate the product :

n ZnO = (coef. ZnO / coef. ZnS) • n ZnS

n ZnO = 2/2 . 0.116

n ZnO = 0.116 mole

m ZnO = n ZnO • Mr ZnO

m ZnO = 0.116 • 81

m ZnO = 9.396 gr

Answer:

Metals consist of giant structures of atoms arranged in a regular pattern. The electrons from the outer shells of the metal atoms are delocalised , and are free to move through the whole structure. This sharing of delocalised electrons results in strong metallic bonding .

Explanation:

mark me as brainliest

Answer:

Correct option is

D

1 g of B(s)

Larger is the number of moles, larger is the number of molecules.

As molar mass of B is lowest (=11 g), it will have larger number of moles. Hence, its 1 g will have highest number of molecules and moles.

Answer:d

Explanation:

Answer:

2 Na atoms

1 C atom

3 O atoms

gram formula weight = 105.99 g

hope this helped :)

Explanation:

→ Na

# of Atoms - 2

→ C

# of Atoms - 1

→ O

# of Atoms - 3

→ gram formula weight (g) : 105.99 g

Answer:

element

Explanation:

Answer:

0.0031 moles

Explanation:\(Molarity=\frac{molSolute}{LitreSolution}\\ 0.0125M=\frac{molRNA}{0.25L} \\molRNA=0.0125*0.25=0.0031 mol\)

Answer:

element,compound

Explanation:

im petty sure this is the anwser

Answer: D

Explanation:

Answer:

Double and triple covalent bonds occur when four or six electrons are shared between two atoms, and they are indicated in Lewis structures by drawing two or three lines connecting one atom to another

Explanation:

1.12 M is the dextrose solution's final concentration.

The following formula can be used to determine the concentration of the diluted dextrose solution:

C₁V₁ = C₂V₂

The starting concentration and volume are denoted by C1 and V1, while the final concentration and volume are denoted by C2 and V2.

Given: 2.0 M initial concentration (C1)

14 mL is the initial volume (V1).

25 mL is the final volume (V2).

When the values are substituted into the formula, we get:

C2 = (2.0 M) (14 mL) (25 mL)

To make the calculation easier:

28 = 25C₂

Calculating C2: C2 = 28 / 25 = 1.12 M

As a result, 1.12 M is the dextrose solution's final concentration.

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Answer:

Robert Delaunay's Homage to Blériot (1914) was inspired by the first flight across the English channel.

The grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g. None of the options provided match the calculated value of 466.64 g.

To determine the grams of magnesium hydroxide (Mg(OH)2) needed to yield 8.00 moles of magnesium chlorate (Mg(ClO3)2), we need to consider the balanced chemical equation for the reaction between magnesium hydroxide and chlorine.

The balanced equation is as follows:

2 Mg(OH)2 + 6 Cl2 → 2 Mg(ClO3)2 + 2 H2O

From the balanced equation, we can see that 2 moles of Mg(OH)2 react with 6 moles of Cl2 to produce 2 moles of Mg(ClO3)2.

Therefore, the stoichiometric ratio is 2 moles of Mg(OH)2 : 2 moles of Mg(ClO3)2.

To calculate the grams of Mg(OH)2 needed, we can use the stoichiometric ratio and the given moles of Mg(ClO3)2.

Given:

Moles of Mg(ClO3)2 = 8.00 moles

Using the stoichiometric ratio, we have:

8.00 moles Mg(ClO3)2 × (2 moles Mg(OH)2 / 2 moles Mg(ClO3)2) = 8.00 moles Mg(OH)2

To convert moles to grams, we need to multiply by the molar mass of Mg(OH)2.

The molar mass of Mg(OH)2 = (24.31 g/mol) + (2 * 16.00 g/mol) = 58.33 g/mol

Grams of Mg(OH)2 = 8.00 moles Mg(OH)2 × 58.33 g/mol = 466.64 g

Therefore, the grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g.

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The red line in the diagram below represent

In the given diagram, the red line represents the activation energy. Activation energy is the minimum amount of energy required for a chemical reaction to occur. It represents the energy barrier that must be overcome for the reactants to form products.

The reactants start with a certain amount of potential energy, and the activation energy represents the additional energy needed to reach the transition state where the reaction can proceed.

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Answer:

3.974 x 10¹³ mg

Explanation:

To find the amount in milligrams (mg), you need to multiply the given number by the conversion, 1,000 mg/g. This conversions exists as a ratio which compares the amount of mg per every 1 g. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator).

1,000 mg = 1 g

3.974 x 10¹⁰ g            1,000 mg
-----------------------  x  -------------------  =  3.974 x 10¹³ mg

                                       1 g

Answer:

D

Explanation:

it's D because it goes waxing crescent to waxing gibbous

Answer:

kci represents the formula of salt

KCl exists potassium chloride made of potassium and chloride. They are considered salt because they form K+ and Cl- ions, not OH- or H+ ions.

What is meant by chemical equation?

Chemical equations are symbolic depictions of chemical reactions in which the reactants and products are stated in terms of their corresponding chemical formulae.

Chemical equations, which are expressions that list the names and amounts of the chemicals involved in a process, are used to describe chemical reactions. The initial compound(s)—the reactants—and the final compound(s)—the products—are separated by an arrow in a chemical equation.

Therefore, the correct answer is option b) KCl.

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Credit is an arrangement in which you receive money now and pay it back later with fees and interest.

Credit is a form of money or capital that is lent from a lender (usually a bank or financial institution) to a borrower in exchange for future repayment of the principal sum plus interest. Credit is used by individuals, businesses and governments to finance their activities. Credit is also used to purchase goods and services, such as mortgages, car loans, student loans, and business loans. Credit is an important part of the financial system and plays a crucial role in economic growth. Credit allows individuals and businesses to purchase items without having to save up for them, and it also allows them to spread out their payments over time. Credit can help businesses finance investments in new equipment and expand their operations, creating jobs and stimulating economic growth.

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