What might the student have done that caused this
error? List all possible causes.

According to the given figure, The Unknown is Frequency. Rest everything given in the options can be calculated from the given informations.

The number of times that a periodic function repeats the same sequence of values during a unit variation of the independent variable.

Formula to calculate wavelength :

λ = v/f

In the question, velocity is given . But Frequency is not given.

Hence, The unknown is Frequency. Rest everything given in the options can be calculated from the given informations.

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Answer:

b

Explanation:

because hahamaskdjdjskskskskkssksksks

The molecules in a sample of solid so2 are attracted to each other by a combination of London forces and dipole-dipole interactions.

Other names for London dispersion forces include dispersion forces, London forces, fluctuation induced dipole bonds, instantaneous dipole-induced dipole forces, and weakly van der Waals forces. Since the electrons are often arranged symmetrically with regard to the nucleus, they serve as a form of electrically symmetric force between atoms and molecules.

Dipole-dipole interactions, which result from the close association of induced or permanent dipoles, are weak interactions. Van der Waals interactions are the name given to these forces taken as a whole. These interactions are widespread in proteins and range widely in strength.

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Answer:

The answer is option A

Colorful feathers

Hope this helps you

Answer:

Earth Science?

Explanation:

its not marine science or life so its physical or earth

Answer:

156.07 lb/cu ft

Explanation:

Answer:

Explanation:

Since electrons are particles that are in constant movement in a wave-like motion, is impossible to know exactly their position and velocity at all times. That's why instead of defining an orbit for them we define an atomic orbital, which is a location in space where the probability of finding an electron is high (therefore, is an electron dense zone). Since this zone has not defined limits (the wave function characterizing the orbital extend from the nucleus to infinity), the further we go from the nucleus the less dense this "cloud" is.

There is about a 90 percent probability of finding the electron  within a sphere of radius 100 pm surrounding the nucleus.  Thus, we can represent the 1 s orbital by drawing a boundary surface diagram that  encloses about 90 percent of the total electron density in an orbital, and the shape of this orbital is a sphere.

The boundary surface diagrams of p orbitals, for example, will have the shape of two lobes on opposite sides of the nucleus, that means that within this two lobes we have a 90 percent probability of finding the electron, and so on.

The statement that is true among the options provided is: "An electron may fall back to the ground state in a single step or in multiple steps."

Higher energy levels are attained by excited electrons in atoms. The extra energy is finally released as light when they reach their ground state, though. The electron may return to its ground state in a single step, emitting a photon with a certain wavelength, or it may do so in several phases, releasing photons with various wavelengths.

The following additional options' statements are untrue:

Without having to leave the heat of the flame, excited electrons can return to the ground state. The flame's heat is what initially excite the electrons, yet the atom can still return to its ground state while it is still in the flame.

The claim that only one electron can be excited at a time is untrue since several electrons can be excited simultaneously.

In a flame test, each element emits a variety of recognizable light wavelengths. The energy differences between the excited states and the ground state of various electrons in the atom are reflected in the specific wavelengths that are emitted.

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Answer:

A. a decrease in pressure

Explanation:

(a) The balanced net ionic equation for the given reaction is 2 NH4+ (aq) + 2 OH- (aq) ⇌ 2 H2O(l) + 2 NH3(aq).

(b) Acid: NH4+ (aq)

(c) Base: OH- (aq)

(d) Conjugate base: NH3(aq)

(e) Conjugate acid: H2O(l)

(a) Balanced net ionic equation (include the states of each component):

2 NH4+ (aq) + 2 OH- (aq) ⇌ 2 H2O(l) + 2 NH3(aq)

(b) In the above equation, NH4+ acts as an acid as it donates a proton (H+) to OH-, which is the base.

The resulting product is H2O, which is neutral.

(c) OH- acts as a base in the given reaction as it accepts a proton (H+) from NH4+, which is the acid.

(d) The conjugate base in the given reaction is NH3, which is formed when NH4+ loses a proton (H+).

(e) The conjugate acid in the given reaction is H2O.

In this balanced net ionic equation, the acid (NH4+) reacts with the base (OH-) to form water (H2O) and the conjugate base (NH3). The conjugate acid is H2O, which is formed during the reaction. This equation represents the acid-base reaction between ammonium chloride and barium hydroxide, where ammonium (NH4+) and hydroxide (OH-) are the reactive species, and ammonia (NH3) and water (H2O) are the products.

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if 3.45 grams of magnesium are burned, 1.725 grams of magnesium oxide are produced. The chemical equation for the reaction of magnesium with oxygen is 2MgO.

Magnesium is a chemical element that is highly reactive, meaning that it easily reacts with other substances. When magnesium is burned in the presence of oxygen, it reacts with the oxygen to form magnesium oxide,

The chemical equation for the reaction of magnesium with oxygen is:

2Mg + O2 -> 2MgO

This equation tells us that for every 2 grams of magnesium that react with oxygen, 2 grams of magnesium oxide are produced. Therefore, if 3.45 grams of magnesium are burned, the number of grams of magnesium oxide produced can be calculated as:

3.45 grams Mg / 2 grams Mg/1 gram MgO = 1.725 grams MgO

Therefore, if 3.45 grams of magnesium are burned, 1.725 grams of magnesium oxide are produced.

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The process of the converting the gas in to the liquid on on cooling is called as the condensation.

The condensation is the process of the transformation by which the gaseous substance will changed in to the liquid form on the cooling. The one of the example of the condensation is the Conversion of the water vapor present in the air into the water droplets. When the water vapor that is present in the air comes in the contact with the cold surface and then  it condenses to form the water droplets.

Thus condensation is the process of the conversion of the gas in to the liquid.

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Answer:

Both are caused by heating and both are physical and chemicals.

Explanation:

The similarity between the two changes that have common things are

A. Both are caused by heating.

C. Both conserves mass.

D. Both are chemical changes.

The term “physical change” refers to a change in an object's appearance. When there is a change in the surroundings of the object, such as a rise in temperature or pressure, a physical change takes place.

When candles are burned, the wax melts, but as soon as the temperature drops, the wax hardens and solidifies once more.

Here, chemical changes happen because these changes can not be undone again. When a substance changes their appearance, they always have the same mass.

Thus, the correct options are A. Both are caused by heating, C. Both conserve mass, and D. Both are chemical changes.

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Answer:

mol is a measurement of large amounts so big

Answer:

10.58km

The formula needed to calculate the amount of wire used is expressed as:

W is the weight of wire used to wind a magnet

wg is the weight of wire per km

Given the following parameters:

Substitute the given parameters into the formula to have:

Hence the length of wire used is 10.58km

All these terms describe a mind map detailed graphic , colorful , unordered and creative

The terms that describes a mind map are detailed , as lots of detailing is done using connection symbols

Graphic , they are graphical representation of an information

Colourful , They are colourful as to make it more visually interesting .

Unordered , They information might not be in sequence and so can be called unordered also

Creative , Yes it is creative as it brings out the artist inside you and you think more ideas to make it look more beautiful and understandable .

So All these terms describe a mind map detailed graphic , colorful , unordered and creative.

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The amount of heat that must be withdrawn from the unit per mole of feed is 312.58 kJ.

To calculate the amount of heat that must be withdrawn, we need to determine the enthalpy change for each component in the process. The enthalpy change can be calculated using the heat capacities and temperature differences.

First, we need to calculate the enthalpy change for the combustion of the synthesis gas. The reaction can be represented as:

CO + 0.5O₂ + 1.5N₂ + 2H₂ → CO₂ + 1.5N₂ + H₂O

The enthalpy change for this reaction can be calculated using the heat of formation values for the compounds involved. In this case, we assume the heat of formation values are constant and independent of temperature.

Next, we calculate the enthalpy change for the combustion of the excess air. The reaction can be represented as:

1.2O₂ + 3.6N₂ → 3.6N₂

Again, we use the heat of formation values to calculate the enthalpy change.

Finally, we subtract the enthalpy change for the combustion of the excess air from the enthalpy change for the combustion of the synthesis gas to determine the net enthalpy change for the process.

The enthalpy change for the synthesis gas combustion is 1969.68 kJ/mol, and the enthalpy change for the excess air combustion is -1776.76 kJ/mol.

Therefore, the net enthalpy change per mole of feed is 1969.68 kJ/mol - 1776.76 kJ/mol = 192.92 kJ/mol.

Since 40% excess air is used, the net enthalpy change per mole of feed is multiplied by 0.4 to account for the excess air: 0.4 * 192.92 kJ/mol = 77.17 kJ/mol.

The amount of heat that must be withdrawn from the unit per mole of feed is 77.17 kJ/mol, or approximately 312.58 kJ when rounded to two decimal places.

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Enthalpy of the reaction is 238.88 kJ/ mol.

What is the enthalpy of the reaction?

The change in enthalpy that takes place during a chemical reaction at constant pressure is known as the Heat of Reaction (also known as the Enthalpy of Reaction). It is a helpful thermodynamic unit of measurement for determining how much energy per mole is emitted or created during a reaction.

Given mass of sodium = 0.538 g

The reaction is,

Na(s)+HCl(aq)→NaCl(aq)+12H2+Δ(heat)

number of moles of sodium = given mass / molar mass

number of moles of sodium = 0.538 g / 22.99 g/mol

number of moles of sodium = 0.0234 mol

enthalpy of the reaction ΔH∘rxn = 5590J/ 0.0234 mol

enthalpy of the reaction ΔH∘rxn  = 238.88 kJ/ mol

Hence, enthalpy of the reaction is 238.88 kJ/ mol

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Answer:

The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.

Answer:

22.5%

Explanation

% composition = Molar mass of S

------------------------ x 100

Molar mass of Na2SO4

= 32.065

------------ x 100

142

=0.225 x 100

= 22.5%

Answer:

The specific heat of iron is 0.449 J/g°C.

Explanation:

First, let's see the formula of specific heat:

Now, we have to replace the given data in the formula, where q = 8980 J, m = 200 g and ΔT = Final temperature - Initial temperature = 120 °C - 20 °C = 100 °C:

The specific heat of iron is 0.449 J/g°C.

The volume occupied by 0.50 mole of the gas at a temperature of 35 °C and at 1 atm is 12.6 L (3rd option)

We can obtain the volume of the gas by using the ideal gas equation as shown below:

PV = nRT

1 × V = 0.50 × 0.0821 × 308

V = 12.6 L

Thus, from the above calculation, it is evident that the volume of gas is 12.6 L (3rd option)

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According to the label the true statement about the following substance is option c. It does not pose a health risk

Specially designed labels with particularly specialised adhesive qualities are called "lab labels." In the pharmaceutical or medical industry, as well as in laboratories, they are used for labelling. For the labelling of tubes, test tubes, blood bags, and other types of vessels, special laboratory labels are created.

Labels on chemicals

The identify of the hazardous chemical(s) in the container (for example, chemical name) and the dangers present must both be listed on this label. This warning about hazards can be distributed in a variety of ways. Employers want to choose a solution that will function in each place.

The following label indicates that the chemical does not pose a health risk.

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The binding energy of an atom of 80Kr is 7.88 MeV per nucleon.

The mass of an atom of 80Kr is 79.916379 amu. The mass of a proton is 1.007825 amu and the mass of a neutron is 1.008665 amu. The total number of protons and neutrons in an atom of 80Kr is 80, so the total mass of the protons and neutrons is 80 * (1.007825 amu + 1.008665 amu) = 81.67222 amu.

The difference between the mass of the atom and the mass of the protons and neutrons is called the mass defect. The mass defect for an atom of 80Kr is 79.916379 amu - 81.67222 amu = -1.755841 amu.

The binding energy of an atom is the energy required to break the atom into its constituent parts. The binding energy per nucleon is the binding energy divided by the number of nucleons in the atom.

The binding energy per nucleon for an atom of 80Kr is (-1.755841 amu) * (931.494 MeV/amu) / 80 = 7.88 MeV/nucleon.

The binding energy per nucleon of an atom is a measure of the stability of the atom. The higher the binding energy per nucleon, the more stable the atom. The binding energy per nucleon of 80Kr is relatively high, which means that 80Kr is a relatively stable atom.

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wassup baby tryna add me on snap

Explanation:

like fr add me on snap

Answer:

Explanation:

The concentration of Ca(OH)2 in the solution is approximately 1.33 x 10^(-6) M.

To find the concentration of Ca(OH)2 in a solution with a pH of 8.57, we need to use the concept of pOH, which is the negative logarithm of the hydroxide ion concentration ([OH-]). The pOH can be calculated by subtracting the pH from 14, which gives us 14 - 8.57 = 5.43.

Since Ca(OH)2 produces two OH- ions for every molecule of Ca(OH)2 that dissolves, the concentration of OH- ions will be twice the concentration of Ca(OH)2. Thus, we have [OH-] = 2x, where x represents the concentration of Ca(OH)2.

Taking the antilogarithm of the pOH, we find that [OH-] = 10^(-pOH) = 10^(-5.43).

Since [OH-] = 2x, we can write 2x = 10^(-5.43) and solve for x.

x = (10^(-5.43))/2 ≈ 1.33 x 10^(-6) M

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The percentage yield of the given chemical reaction is equal to 91.84 %.

The yield of reaction can be described as a measure of the amount of the product produced with respect to the amount of the reactant consumed, formed product in a chemical reaction, usually expressed as a percentage.

The percent yield can be described as a comparison between the actual yield and the theoretical yield based on the equation.

Given the theoretical yield of the reaction, = 28.1 g

The actual yield of the reaction = 25.9 g

The % yield of the reaction can be determined as:

Percent yield = (25.9/28.2) ×100

Percent yield = 91.84 %

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