Which of the following is a mechanical wave?
a
An X-ray taking photos of your bones with X-rays
b Ocean waves crashing on the shore
CUV rays giving you a sunburn
d A microwave oven heating food with microwaves
e
Radios picking up radio waves

Answer:

510g

Explanation:

45mL..

1mL

_____ = 510g

11.3g

Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

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The 15 mL of 0.100 M KOH has been added, NO2- (aq) is present at a higher concentration in the solution than HNO2.

In order to determine whether HNO2 or NO2- is present at a higher concentration after 15 mL of 0.100 M KOH has been added, we need to consider the reaction that is taking place during the titration.

HNO2 is a weak acid that can react with KOH in a neutralization reaction:

HNO2 + KOH → KNO2 + H2O

As KOH is added to the HNO2 solution, the concentration of HNO2 decreases and the concentration of NO2- increases. At the point where 15 mL of 0.100 M KOH has been added, some HNO2 will have reacted with the KOH to form KNO2, but there will still be some HNO2 remaining in the solution.

To determine which species is present at a higher concentration, we need to compare the concentrations of HNO2 and NO2- in the solution after 15 mL of KOH has been added. The concentration of NO2- will be higher than the concentration of HNO2, since the HNO2 has reacted with the KOH and been converted to NO2-.

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Answer:

32 degrees Fahrenheit

Answer:

32f or 0c

Explanation:

32 ferenhiet or 0 celsius

Answer:

thx for giving points and in reaturn i won't answer qustion because i don't know the answer thx for th points agian

Explanation:

Answer: Cotton

Explanation: Yes

In the context of atomic orbital (AO) wavefunctions, the terms "radial node" and "nodal plane" refer to different aspects of the wavefunction's behavior.

A radial node is a region in the AO wavefunction where the probability of finding an electron is zero along the radial direction. In other words, it represents a spherical shell where the electron is unlikely to be found. The number of radial nodes is determined by the principal quantum number (n) of the orbital. For example, the 2s orbital has one radial node, while the 2p orbital has no radial nodes.

On the other hand, a nodal plane is a flat plane within the AO wavefunction where the probability of finding an electron is zero along a particular direction. It represents a surface that divides the orbital into two regions of opposite phases. The number of nodal planes is determined by the angular quantum numbers (l and m) of the orbital. For example, the 2s orbital has no nodal planes, while the 2p orbital has one nodal plane (the xz or yz plane).

Radial nodes arise from the radial part of the wavefunction because they depend on the distance from the nucleus. The radial part determines the distribution of the electron density as a function of distance, and the nodes correspond to regions where the density drops to zero.

On the other hand, nodal planes arise from the angular part of the wavefunction because they depend on the orientation and shape of the orbital. The angular part describes the angular distribution of the electron density around the nucleus, and the nodal planes correspond to regions where the phase of the wavefunction changes sign.

In summary, radial nodes are related to the distance from the nucleus and arise from the radial part of the wavefunction, while nodal planes are related to the orientation and shape of the orbital and arise from the angular part of the wavefunction. The 2s orbital has one radial node and no nodal planes, while the 2p orbital has no radial nodes and one nodal plane.

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630°C of temperature must be attained by the gases.

Gay-law Lussac's which was found in 1808 and published in 1809, is the term used to describe Joseph-Louis Gay-law Lussac's of combining volumes of gases. It can also describe the relationship between a gas's volume and absolute temperature under constant pressure. Simple whole numbers can be used to indicate the volume ratio of the reactant gases to the gaseous products.

This is an illustration of Gay-Law Lussac's since the volume is constant but the pressure and temperature are changing:

\(P1/T1=P2/T2\)

The formula above may be rearranged to yield

T2=T1*P2/P1

Your data include:

P1=206. 843 kPa

T1=(27+273.15)K=300.15K

P2= 620. 528 kPa

T2=?

T 2 = 300.15 K* 620. 528 kPa/ 206. 843 kPa= 900.45K = 627.3 °C

Near to 627.3 °C the temerature is 630 °C

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The temperature distribution in a plane wall with constant heat input qo at x = 0 and temperature T at x = L is given by T(x) = [(T - qo) / L]x + qo.

To derive the temperature distribution in a plane wall with constant heat input, we can use the one-dimensional steady-state heat conduction equation. Let's go through the derivation step by step:

Step 1: Set up the problem

Consider a plane wall with a constant heat input qo at x = 0 and a temperature T at x = L. We want to find the temperature distribution within the wall.

Step 2: Write the heat conduction equation

The one-dimensional steady-state heat conduction equation is given by:

d²T/dx² = 0

Step 3: Integrate the equation

Integrating the above equation with respect to x twice gives:

dT/dx = A

where A is a constant of integration.

Integrating once more, we get:

T(x) = Ax + B

where B is another constant of integration.

Step 4: Apply boundary conditions

Using the boundary conditions, T(0) = qo and T(L) = T, we can determine the values of A and B.

At x = 0: T(0) = A(0) + B = qo

Thus, B = qo.

At x = L: T(L) = AL + qo = T

Solving for A, we get A = (T - qo) / L.

Step 5: Final temperature distribution

Substituting the values of A and B back into the temperature equation, we obtain the temperature distribution in the plane wall:

T(x) = [(T - qo) / L]x + qo

This equation represents the temperature distribution within the wall, where the temperature gradually increases from qo at x = 0 to T at x = L.

Note: This derivation assumes steady-state conditions, one-dimensional heat conduction, and a constant heat input qo.

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Answer:

Explanation:

this is the answer hope it helps!(:

The chemical formula of pentanitrogen heptachloride is N₅Cl₇ as it has 5 nitrogen atoms and 7 chlorine atoms.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:

63%

Explanation:

About 63% of this electricity generation was from fossil fuels—coal, natural gas, petroleum, and other gases. About 20% was from nuclear energy, and about 18% was from renewable energy sources.

Hope this helped you!

Answer:

\(71.7\%.\)

\(Coal, \: crude \: oil, \: and \: natural \: \\ gas \: are \: all \: considered \: fossil \: fuels \\ coal \: 48.5 \\ natural \: gas \: 21.6 \\ petroleum \: 1.6

\)

\(the \: sum \: of \: the \: three \:: \\ (48.5+ 21.6+ 1.6) = 71.7.\)

Note that the items are matched accordingly:

The items listed appear to be related to welding, specifically oxyacetylene welding, which uses a mixture of oxygen and acetylene gas to create a flame hot enough to melt and join metal.

The tank contains the gases, and the oxyacetylene outfit refers to the equipment used to control and mix the gases.

The neutral flame is used for welding, while the goggles protect the welder's eyes. Teflon is a material used to coat welding surfaces, and compression is involved in the welding process.

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The replacement of a hydrogen atom in CH\(_{4}\) by a chlorine atom causes an increase in boiling point because chlorine is more electronegative than hydrogen, resulting in a stronger dipole-dipole attraction between molecules.

When a hydrogen atom in CH\(_{4}\) is replaced by a chlorine atom, the resulting molecule becomes CH\(_{3}\)Cl. Chlorine is more electronegative than hydrogen, meaning it has a higher affinity for electrons. This causes the chlorine atom to pull the shared electrons closer to itself, creating a partial negative charge. The hydrogen atom in CH\(_{4}\), on the other hand, is less electronegative, resulting in a partial positive charge.

The difference in electronegativity between chlorine and hydrogen leads to a stronger dipole-dipole attraction between CH\(_{3}\)Cl molecules compared to CH\(_{4}\) molecules. This increased intermolecular force requires more energy to break the attractive forces and convert the substance from a liquid to a gas, resulting in a higher boiling point.

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Answer:

11 moles

Explanation:

1 mole of C12H22O11 molecules produces 12 moles of CO2 molecules and 11 moles of H2O molecules.

Fertilizer from suburban lawns and wastewater from a water treatment plant.

What is fertilizer?

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Answer:

Of the options below, which is an example of a point source of water pollution?

Litter and pet waste are left on a city’s beaches.

Landscapers' fertilizers and pesticides are sprayed on the lawns of a neighborhood.

Acidic runoff from abandoned mines contains lead and mercury that saturate the soil.

A factory’s wastewater pipe opens directly over a nearby river.

CONCEPT

Explanation:

Correct Answer:

A factory’s wastewater pipe opens directly over a nearby river.

Answer:

Chemical change

Explanation:

There are types of changes in nature namely: physical change and chemical change. A physical change is a change that does not alter the chemical composition of the substances involved, hence, no new substances are formed. On the other hand, a chemical change changes the chemical composition of the involved substances to form new substances.

Based on the definition of the types of changes below, the equation depicted in this question is a CHEMICAL CHANGE because it involves a rearrangement of the atoms of each element in the reactants to produce new sets of products with a new chemical formula.

C17H17ON3(s) + 2C4H6O3(l) → C21H21O5N(s) + 2C2H4O2(l)

The complete question requires that we verify the density of both objects.

The density of object 1 is; 8.1g/cm³ while the density of object 2 is; 8.16g/cm³

The density of a substance is given as;

Density = Mass/Volume

Therefore, for Object 1;

Volume = (3.17)³ = 31.86cm³

Density (1) = 257.7/31.86 = 8.1 g/cm³

For Object 2;

Density = 128.9/15.8

Density = 8.16g/cm³

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Answer:

89-91=1 the answer is 1molar mass

Answer:

A person sings into a microphone.

Sound is converted to an electrical signal

The electric signal creates a magnetic code.

A magnetic code is transferred to a medium such as a tape or ...

Using the law of the conservation of mass, the reactions can be shown to obey the law.

We need to know what the law of the conservation of mass says so that we can be able to know how we can be able to apply the law in the proper perspective. We have to know that the law says that total mass of the system would remain constant. The implication of this is that the mass before the reaction would be the same as the mass after the reaction. The mass of the substance must be able to add up in the system that is under study as we have one here.

Mass of the iron = 56 g

Mass of the chlorine = 35.5 g

Balanced reaction equation;

\(2Fe + 3Cl_{2} ---- > 2FeCl_{3}\)

This is the  formation of the iron III chloride

Total mass on the right hand side = 2(56) + 6(35.5) = 325 g

Total mass on the left hand side = 2[56 + 3(35.5)] = 325 g

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Answer:

10 400 N

Explanation:

A drag force is an oppositional or limiting force which must be overcome before an object must move wit a force. The lesser the drag force, the higher the probability that an object would move easily.

From the question give, the resultant force of the was is 600 N and force from the engine - 11 000 N.

Drag force = 11 000 - 600

                 = 10 400 N

The drag force on the car is 10 400 N.

This shows that the car would not move since the drag force (10 400 N) is far greater than the resultant force(600 N).

Answer:

Sulphate ion

Explanation:

Zinc will undergoes oxidation. Zn2+ - - > Zn + 2e-

Copper will undergoes reduction. Cu2+ + 2e- - - > Cu

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

Answer: Physical Properties

Explanation:

The reaction given below can be represented as follows:`

H2PO4– + H2O ⇋ H3O+ + HPO42–

`Base–conjugate acid pair:` H2PO4–` and `HPO42–`

A Brønsted-Lowry acid-base reaction involves the transfer of a proton from one substance to another.

In this reaction, H2PO4– acts as an acid, donating a proton to water.

This produces the conjugate base of H2PO4–, HPO42–, and the conjugate acid of water, H3O+.

A base-conjugate acid pair is defined as two substances that differ only in the presence or absence of a single proton.

In this reaction, the base H2PO4– loses a proton to form its conjugate acid, HPO42–.

Therefore, `H2PO4–` and `HPO42–` is the base–conjugate acid pair.

The term "base-conjugate acid pair" refers to two species with the following characteristics:

They are both conjugates.

They differ by one hydrogen ion.

The dissociation of an acid (HA) results in the formation of a conjugate base (A−) and a hydrogen ion (H+). HA is called an acid, while A− is called a conjugate base.

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In accordance with Beer's Law, the slope of the linear trendline on a plot of absorbance versus concentration is equal to the molar absorptivity coefficient, also known as the extinction coefficient.

This coefficient is a constant that reflects the ability of a substance to absorb light at a particular wavelength.

The greater the molar absorptivity coefficient, the more efficiently the substance absorbs light at that wavelength.

By measuring the absorbance of a solution at different concentrations, we can plot a linear trendline and use its slope to calculate the molar absorptivity coefficient.

This is a crucial parameter in many analytical techniques, such as spectrophotometry, which rely on the relationship between concentration and absorbance to quantify the amount of a substance in a sample.

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The unknown mineral is gold because of the similar properties of gold to that unknown mineral.

The unknown mineral is Gold because it has similar properties to the gold. Gold has density of 19.3 grams per cubic centimeter which is same to this unknown mineral. The hardness and mass of the mineral are also similar to the Gold.

So we can conclude that the unknown mineral is gold because of the similar properties of gold to that unknown mineral.

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Note that aspartic acid is predicted to migrate the furthest down the gel in an isoelectric focusing experiment.

In isoelectric focusing, a pH gradient is established across a gel matrix, and charged molecules such as amino acids move towards their isoelectric point (pI), where they have no net charge and stop migrating.

Amino acids with pI values above the pH of the gel migrate towards the anode, while those with pI values below the pH of the gel migrate towards the cathode.

The pI values of the three amino acids are:

Assuming a pH gradient ranging from 2 to 10, we can predict the relative migration of these amino acids as follows:

Therefore, aspartic acid is predicted to migrate the furthest down the gel in an isoelectric focusing experiment.

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When EROEI (Energy Return on Energy Investment) is equal to 1, it means that the energy gained from a particular source is equivalent to the energy invested in obtaining that energy. In other words, the energy return is equal to the energy input. This indicates a situation where the energy extraction process is barely breaking even, with no net gain or loss in energy.

EROEI is a metric used to assess the efficiency and viability of energy sources. It measures the amount of usable energy obtained from a particular energy source divided by the amount of energy invested to extract or produce that energy. A value of 1 means that the energy gained is just enough to offset the energy invested.

In practical terms, an EROEI of 1 implies that the energy source being evaluated is not very efficient. It suggests that the amount of energy required to extract, process, or produce the energy is nearly equal to the energy obtained. Therefore, there is little to no surplus energy available for other uses or to sustain the energy extraction process itself.

An EROEI of 1 is often associated with energy sources in their early stages of development or exploration, where the technology or extraction methods may not be fully optimized. It could also indicate energy sources with high production costs or low energy density.

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Answer:

Explanation:

Sound energy: Crowd cheering

Chemical energy: Body converts nutrients into energy to run

Mechanical energy: The camera filming the photo

substances as a weak elctrolyte in water: H₂SO₃

Weak electrolytes are those that do not entirely dissociate or ionise in their aqueous solution. These electrolytes have low electrical conductivity and minimal ionisation extension. NH4OH, CH3COOH, etc. are a few examples. (Salts are occasionally referred to as ionic compounds, but particularly strong bases are also ionic compounds.) Weak acids and bases are among the weak electrolytes. Due to the partial dissociation of the solution in the fused or aqueous solution state, Na2CO3 is a weak electrolyte.A weak electrolyte is a solution where a negligible percentage of the dissolved solute is present as ions. A double arrow, signifying an equilibrium between the reactants and products, is used in the equation to depict the ionisation of a weak electrolyte.

Classify each of the following substances as a non electrolyte, weak electrolyte, or strong electrolyte in water:

1. H₂SO₃

2.NaSo4

3.KCl

4.NH4SO4

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