please help I have no idea tbh

Answer:

C

Explanation:

Neon is a noble gas, which is monoatomic.

The percent yield is 86.3%. The balanced chemical equation for the reaction between methane (CH4) and oxygen (O2) to form carbon dioxide (CO2) and water (H2O) is: CH4 + 2O2 → CO2 + 2H2O

The molar mass of CH4 is 16 g/mol, and 32 g of CH4 corresponds to 32 g / 16 g/mol = 2 moles of CH4.  From the balanced equation, 1 mole of CH4 produces 1 mole of CO2. Therefore, the expected mass of CO2 produced from 2 moles of CH4 is:

1 mole CO2 / 1 mole CH4 × 44 g/mol CO2 × 2 moles CH4 = 88 g

However, the actual mass of CO2 produced is 75.9 g.

The percent yield is calculated as:

(actual yield / theoretical yield) × 100%

In this case, the actual yield is 75.9 g, and the theoretical yield is 88 g. Therefore, the percent yield is:

(75.9 g / 88 g) × 100% = 86.3%

The percent yield is 86.3%.

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Alkanes are saturated hydrocarbons that have single bonds in chains

General formula for alkanes :

\(\tt \large{\bold{C_nH_{2n+2}}\)

Hydrocarbon combustion reactions (specifically alkanes)

\(\large {\box {\bold{C_nH _ (_2_n _ + _ 2_) + \dfrac {3n + 1} {2} O_2 \Rightarrow nCO_2 + (n + 1) H_2O}}}\)

So that the burning of ethane with air (oxygen):

\(\tt C_2H_6+\dfrac{7}{2}O_2\rightarrow 2CO_2+3H_2O\)

2C₂H₆ (g) + 7O₂ (g) ⟶ 4CO₂ (g) + 6H₂O (ℓ)

or we can use mathematical equations to solve equilibrium chemical equations by giving the coefficients for each compound involved in the reaction

C₂H₆ (g) + aO₂ (g) ⟶ bCO₂ (g) + cH₂O (ℓ)

C : left 2, right b ⇒ b=2

H: left 6, right 2c⇒ 2c=6⇒ c= 3

O : left 2a, right 2b+c⇒ 2a=2b+c⇒2a=2.2+3⇒2a=7⇒a=7/2

Answer:

All elements, and compounds, all matter in point of fact, are composed of atoms. In a compound, there are 2 or more different types of atoms present that are chemically bound. In an element, there is only the one type of atom.

Explanation:

Answer:

The extraction is done by electolysis but first the aluminium oxide must be melted so that electricity can pass through it...The use of molten cryolite as a solvent reduces some of the Energy

costs involved in extracting aluminum by allowing the ions in aluminum oxide to move freely at low temperature ..

Answer:

i need help!!!!!!

Explanation:

The nominal volume for highly accurate and precise measuring instruments like the 25 ml pipet, and use the measured value with uncertainty for less precise instruments like the 100 ml graduated cylinder.

To accurately determine the value of the volumes to use in your calculations, you need to consider the accuracy and precision of the measurement devices you are using.

A 25 ml pipet is a volumetric instrument with high accuracy and precision, typically with an uncertainty of ±0.03 ml. This means that the volume delivered by the pipet could vary by up to ±0.03 ml from the nominal volume of 25 ml. Therefore, you would use the nominal volume of 25 ml when making calculations using a 25 ml pipet.

On the other hand, a 100 ml graduated cylinder is a less precise measuring instrument with a higher uncertainty, typically with an uncertainty of ±1 ml. This means that the volume measured using a 100 ml graduated cylinder could vary by up to ±1 ml from the actual volume. Therefore, you would use the measured value from the graduated cylinder, taking into account the uncertainty, when making calculations using a 100 ml graduated cylinder. For example, if you measured a volume of 98 ml using the graduated cylinder, you would use 98 ± 1 ml in your calculations.

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Answer:

yes the answer is c

Explanation:

Answer:

0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Explanation:

The balanced chemical equation for the reaction of hydrogen and nitrogen to form ammonia is:

N2(g) + 3H2(g) → 2NH3(g)

To determine how many moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen, we need to use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the volume of hydrogen gas to moles using the ideal gas law equation:

n = PV/RT

where P is the pressure in atm, V is the volume in liters, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

n = (1.2 atm)(4.0 L)/(0.0821 L·atm/mol·K)(50.0°C + 273) = 0.174 mol H2

Since there is excess nitrogen, all of the hydrogen will react to form ammonia. Using the mole ratio between NH3 and H2 from the balanced chemical equation:

2 mol NH3 / 3 mol H2

we can calculate how many moles of NH3 will be produced:

n(NH3) = (0.174 mol H2) × (2 mol NH3 / 3 mol H2) = 0.116 mol NH3

Therefore, 0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Answer:

Energy is released when bonds are broken, and energy is absorbed when bonds are formed.

Atomic orbitals are the areas to the left and right of the dashed lines. The possible molecular orbitals that they can form are indicated by the dashed lines.

Normally, in diatomic molecular orbitals, the atomic orbitals with the closest energy level can overlap with each other and form molecular orbitals. Therefore, the atomic orbitals generally tend to overlap one by one from the lowest potential energy to the highest potential energy. For example, in a homonuclear diatomic molecule, which means that both atoms are the same element, the same orbitals will overlap together and form molecular orbitals.

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RF value is qual to the distance travelled by solute over the distance travelled by the solvent.

RF value or the retention value is a physical constant that helps to identify the distance travelled by different solutes that are present in the same solution. This method is generally used in chromatographic techniques, to record the progress of any particular reactions occurring.

In Chromatography RF values are the most basic prerequisite of the experiment. The values that we get from the RF values indicates whether the solute prefers the stationary or mobile phase. With these stationary or mobile phases, RF values are used to determine the polarity, relative masses and also relative stability among other things.

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Answer:

It is noticed that after five days, there is elongation of the root cells in the roots of onion in the jam bottle

Explanation:

It is noticed that after five days, there is elongation of the root cells in the roots of onion in the jam bottle. The growth of a plant is due to the availability of the growing and  dividing cells in the meristematic regions of the apical meristems. (stem cells). This site are active site for elongation and differentiation  of the stem tissues. In the apical meristem of the root cells, the cells have the potential to carry out mitosis and cell division repeatedly in order to generate newer cells for extension and development of stems and leaves. With each cell division, one cell remains in the meristem which the other increases in size and differentiate due to different genomic expression to form the meristem regions which eventually becomes the stem structure.

161.84kJ/mol of energy is required to activate the isomerization of methyl isocyanide,

It is given that the isomerization of methyl isocyanide follows first order kinetics. The half-lives t1/2 is 161min at T₁ 199°C and t1/2 is 5min at T₂ 230°C. The rate constant of first order kinetics is given by,

k = 0.693/half-life

On substituting the values we get,

k₁₉₉ = 0.693/161

k₁₉₉ = 4.3 x 10⁻³/min

Similarly,

k₂₃₀ = 0.693/12.5

k₂₃₀ = 0.055/min

To find the activation energy, the following formula is used

ln(k₁/k₂) = Eₐ/R(1/T₂ - 1/T₁)

On substituting the values we get,

ln(4.3 x 10⁻³/0.055) = Eₐ/8.314(1/503 - 1/472)

On solving the values on both sides we get,

Eₐ = 161.84kJ/mol

Therefore, the activation energy required for the isomerization of methyl isocyanide is 161.84kJ/mol

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The segment register that can be used to form the source operand address in the instruction MOV AX, 100[BP][SI] is DS (Data Segment).

Without knowing the base for Y, it is not possible to establish a direct relationship between the three unsigned numbers X=1001001B, Y=120Q, and Z=5EH.

In the instruction MOV AX, 100[BP][SI], the segment register that can be used to form the source operand address is DS (Data Segment). The DS register holds the segment base address, which is added to the effective address to calculate the physical address of the source or destination data.

Regarding the relationship between the three unsigned numbers X=1001001B, Y=120Q, Z=5EH:

X=1001001B: This is a binary number represented in base 2. It has a value of 73 in decimal notation (base 10). The subscript "B" indicates that the number is in binary format.

Y=120Q: This number is represented using an unknown base, denoted by the subscript "Q." Without knowing the base, it's not possible to determine the exact value of Y or establish a relationship with the other numbers.

Z=5EH: This number is represented in hexadecimal notation (base 16). It has a value of 94 in decimal notation (base 10). The subscript "E" indicates that the number is in hexadecimal format.

Without knowing the base for Y, it is not possible to establish a direct relationship between X, Y, and Z.

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Moving hot food in a covered pan to a cooler space, such as a storage room, or submerging it in ice water, is another option. Ice can also be used to hasten the cooling process.

Soups can be chilled by submerging them in cold water. This technique aids in a swift and secure drop in food temperature. To make a slush, put some ice in a big container or sink and add some water. After that, put the plate of food to be chilled into the ice bath. bathing in ice water and stirring the food often.Food is stirred with ice paddles, which are plastic containers that have been frozen after being filled with water.using ice as a component (if water is an ingredient).chiller that jars or tumbles.

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A 138 mL solution of H3(AsO4) is neutralized by 52.0 mL of a 0.30 M Ag(OH) solution. 0.11M  is the concentration of the H3(AsO4).

Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, concentration in moles, numerical concentration, or volume concentration are four different categories of mathematical description.

Any type of chemical mixture can be referred to by the term "concentration," however solvents and solutes in solutions are most usually mentioned. There are different types of molar (quantity) concentration, including normal concentration or osmotic concentration.

Molarity₁×Volume₁=Molarity₂×Volume₂    

0.30 ×52.0=Molarity₂× 138

Molarity₂ = 15.6/ 138

                =0.11M

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The coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.

When each element has the same amount of atoms on both sides of the equation, the equation is said to be balanced. Chemical equations are balanced through the application of coefficients. An element is given a coefficient, which is a number, to complete the number of atoms.

In the subsequent response:

2H2 +O2 = H2O.

We use coefficient 2 to balance the number of hydrogen and oxygen atoms. To balance the following reaction, coefficient 2 should be put in front of H2O: 2H2 +O2 = 2H2O.

A coefficient is an integer that is either multiplied by the variable it is associated with or written alongside the variable. A coefficient is, in other words, the numerical factor of a term that contains both constants and variables. For instance, the coefficient in the expression 2x is 2.

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answer:

millions of animals..

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In the system at equilibrium liquid water-water vapor, if liquid water is added to the system, more liquid water molecules will change to water vapor until a new equilibrium is reached.

If a constraint (such as a change in pressure, temperature, or concentration of a reactant) is applied to a system in equilibrium, the equilibrium will shift so as to tend to counteract the effect of the constraint.

Let's consider the following system at equilibrium.

H₂O(l) + heat ⇄ H₂O(g)

Which statement best describes what will happen if liquid water is added to the system?

In the system at equilibrium liquid water-water vapor, if liquid water is added to the system, more liquid water molecules will change to water vapor until a new equilibrium is reached.

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Answer:

More liquid water molecules will change to water vapor until a new equilibrium is reached. Yes. This will happen to counteract the excess of liquid water.

All of the liquid water molecules that are added will become water vapor. No. Some liquid molecules will change to vapor to attain a new equilibrium.

More water vapor molecules will change to liquid water until a new equilibrium is reached. No. The change will happen in the inverse sense.

All of the liquid water molecules that are added will remain liquid water. No. Some liquid molecules will change to vapor to attain a new equilibrium.

Explanation:

The main difference between compounds and molecules is that all compounds are molecules, but not all molecules are compounds.

Compounds are substances that are composed of two or more different elements chemically bonded together. In other words, they are made up of molecules that consist of atoms from different elements. On the other hand, molecules can refer to any combination of atoms, whether they are from the same element or different elements.

For example, table salt, chemically known as sodium chloride (NaCl), is a compound. It consists of sodium (Na) atoms bonded to chloride (Cl) atoms. Each NaCl molecule is a compound because it is composed of multiple elements (sodium and chlorine) bonded together.

In contrast, an example of a molecule that is not a compound is oxygen (O2). It is a molecule made up of two oxygen atoms bonded together. Since both atoms in O2 are of the same element (oxygen), it is not considered a compound.

To summarize,  (sodium chloride) is a compound because it is  a molecule formed by the chemical bonding of different elements (sodium and chlorine). It cannot be classified as an element because it contains more than one type of atom. Furthermore, sodium chloride is also a molecule because it consists of atoms held together by chemical bonds. So, NaCl can be classified as both a compound and a molecule.

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Answer:

chemical energy is the energy of a chemical substance that is stored in the bonds of chemical compounds and is released when they undergo a chemical reaction and transform into another substance

Answer:

Explanation:

\(\frac{mass}{volume} =density\\mass=volume \times density=25.3 \times 0.75=18.975 ~gm\)

Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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Answer:

As a Symbol

Explanation:

The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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