Noah and Nina are 15 m apart in a closed room. Noah says the same sentence twice. The first time, Nina does not hear the sound, but she does hear the sentence the second time.

What best describes the difference between the second sound wave and the first?

Answer:

ok

Explanation:

do you still need the answer sorry

The percent composition of salicylic acid is C7H6O3, or 60.87%C, 4.4%H, and 34.75%O

Answer:

All the items in the mixture will not be picked up by the magnet and therefore, all of them would be left behind

Explanation:

Ferromagnetic materials are materials that can become magnetized and are also readily attracted to a magnet or by a magnetic field. Examples of ferromagnetic materials includes, iron, cobalt, and nickel, and their alloys

Ferromagnetic materials are mainly metals while all materials exhibit some form of magnetism including diamagnetism and paramagnetism, but these are not the type of magnetism seen in everyday life

Therefore, since neither of the tomato sauce mixture, the sugar or the carrots are not ferromagnetic materials none of them will be picked up by the magnet.

The cart's gravitational potential energy is 1236.6 J. The nucleus of radioactive substances is unstable due to an imbalance between the number of protons and neutrons.

This imbalance makes the nucleus unstable and causes it to decay.5.6. Alpha particles consist of the largest particles. Alpha particles contain two protons and two neutrons and have a relatively large mass. Because of their large size and positive charge, alpha particles can't penetrate far into matter, and they're easily stopped by a sheet of paper or a few centimeters of air.5.7. Gamma rays are not affected by an electric field.

This is because they have no charge and no mass. Gamma rays are a type of electromagnetic radiation with a high frequency and short wavelength that can penetrate a variety of materials.6.1. Spring balance measures force by using Hooke's law, while a balance scale measures mass by comparing two weights. Examples of pushing forces: The engine of a car applies a force to move the car forward, and a person pushing a trolley.

Examples of pulling forces: A horse pulling a cart, and a person pulling a cart.6.2. When the gradient is a straight line, a force-extension graph indicates that the spring is elastic.6.4. In order to determine the resultant force, we must first calculate the net force by adding the forces acting in the same direction and subtracting those acting in the opposite direction. In this case, the resultant force is (5 - 8 - 11 + 4 + 6) N = -4 N. This negative sign indicates that the resultant force is acting in the opposite direction to the initial forces.6.5.

To calculate the resultant force, we must first add the forces acting in the same direction and subtract those acting in the opposite direction. In this case, the resultant force is (-5 + 7 + 66 - 58 - 12) N = -2 N. This negative sign indicates that the resultant force is acting in the opposite direction to the initial forces.6.6. The gravitational potential energy of a cart at the top of a 300 m hill can be calculated using the formula:

GPE = mghwhere m is the mass of the cart, g is the acceleration due to gravity, and h is the height of the hill.

GPE = 0.420 kg × 9.8 m/s² × 300 m

= 1236.6 J

Therefore, the cart's gravitational potential energy is 1236.6 J.

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Answer:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Explanation:

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Answer:

volume

Explanation:

the mass is the same on earth as it is on the surface of the moon. The weight is determined by the force of gravity. The density is the thickness. But the volume is not a factor.

There is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off

Soil erosion is influenced by various factors, including slope steepness, rainfall intensity, soil characteristics, vegetation cover, and land management practices. As slope steepness increases, the potential for soil erosion generally increases due to the gravitational force acting on the eroded materials. However, there is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off. The relationship between slope steepness and soil erosion is generally non-linear. At low slope angles, soil erosion tends to be minimal as the gravitational force is relatively weak. As the slope angle increases, soil erosion typically increases exponentially due to the increased force of gravity. Eventually, as the slope steepness continues to increase, soil erosion may reach a point of maximum potential where the erodibility of the soil and other factors become limiting factors. Beyond this point, the rate of soil erosion may start to taper off, but it does not completely stop. Instead, it may stabilize or decrease slightly compared to the maximum erosion potential observed at steeper slopes.

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Answer:

C3H6O + 4O2 → 3CO2 + 3H2O or 11

Explanation:

Answer:

11

Explanation:

It is used in the design of engines, where changes in pressure and temperature are used to convert thermal energy into mechanical work. It is also used in meteorology to predict weather patterns and in the study of the Earth's atmosphere.

Pressure and temperature are two fundamental physical quantities that are closely related in many physical processes. Understanding the relationship between these two quantities is essential in many scientific and engineering fields. This relationship can be described by the ideal gas law, which states that the pressure of an ideal gas is directly proportional to its temperature when the volume and number of particles are constant. In other words, when the temperature of a gas increases, its pressure increases, and vice versa. This can be explained by the kinetic theory of gases, which assumes that gases are made up of a large number of small particles that are in constant motion. The speed of these particles is proportional to the temperature of the gas. As the temperature of the gas increases, the particles move faster and collide more frequently with the walls of the container, resulting in an increase in pressure. Similarly, when the temperature of the gas decreases, the particles move slower and collide less frequently with the walls of the container, resulting in a decrease in pressure. This relationship between pressure and temperature is essential in many scientific and engineering applications.

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The structure in the figure where an electron transport chain is located is the inner mitochondrial membrane.

The main function of the processes that occur in the inner mitochondrial membrane, specifically in the electron transport chain, is to generate ATP through oxidative phosphorylation.

The electron transport chain is a series of protein complexes embedded in the inner mitochondrial membrane. It plays a crucial role in the final stage of cellular respiration, which is the process by which cells extract energy from nutrients.

During oxidative phosphorylation, electrons are transferred through the electron transport chain from energy-rich molecules such as NADH and FADH2.

As electrons pass through the protein complexes, their energy is gradually released, and protons (H+) are pumped across the inner mitochondrial membrane from the mitochondrial matrix to the intermembrane space. This creates an electrochemical gradient.

The main function of this electron transport and proton pumping is to establish a proton motive force.

The gradient created by the electron transport chain drives the ATP synthase enzyme, located in the inner mitochondrial membrane, to produce ATP from ADP and inorganic phosphate. This process is known as chemiosmosis.

Overall, the electron transport chain in the inner mitochondrial membrane plays a crucial role in generating ATP, the energy currency of the cell, by utilizing the energy stored in the electrons derived from the breakdown of nutrients.

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Answer:

Divide by the molar mass to get moles

Explanation:

Answer:

41.25g

Explanation:

Given parameters:

Half-life of Technetium - 104  = 18minutes

Mass = 165g

Unknown:

Mass of sample remaining after 36minutes = ?

Solution:

The half-life of a radioactive element is the time taken for half of the element to decay;

Now;

                Start           First half life              Second half-life

Time          0                      18min                        36min

 Mass       165g                 82.5g                        41.25g

"Hypotonic solution," refers to a solution with the highest water concentration due to its lower solute concentration compared to the other options, leading to water influx into cells.

A hypotonic solution would be most likely to have the highest water concentration. In a hypotonic solution, the solute concentration is lower than that inside the cell or compared to another solution. As a result, water tends to move into the cell or the solution to equalize the concentration.

When a cell is placed in a hypotonic solution, water molecules will move into the cell through the process of osmosis. This influx of water increases the water concentration inside the cell, leading to cell swelling or even bursting in extreme cases.

Compared to hypertonic and isotonic solutions, a hypotonic solution has a lower solute concentration, allowing for a higher concentration of water molecules. This results in a higher water concentration in the solution. It's important to note that the concept of tonicity is related to the relative solute concentrations between two solutions and their effect on cell osmosis. In this case, a hypotonic solution is characterized by a higher water concentration compared to the other options.

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The cathodic protection of Cu(s) can be provided if it is connected galvanically to Zn.

The metal with the more reduction potential will act as the anode and undergo oxidation, while the metal with the more positive standard reduction potential will act as the cathode and undergo reduction.

As Cu has a greater reduction potential than Zn, it has a greater capacity to reduce than that of Zn. So by galvanically connecting to zn, we can say that the cathodic protection of Cu can be obtained.

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Answer:

19.5%

Explanation:

the air required for human breathing is 19.5 percent.

Answer:

1 grams NH3 is equal to 0.058718113128665 mole. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between grams NH3 and mole.

Explanation:

Answer:

A - ±0.1

B - ±0.01

C- ±0.001

Explanation:

you can see how each number is rounded to each decimal place.

Answer:

Only the valence shell are shown in the Lewis electron dot structures because, the chemical reactivity of an atom of an element is determined by the valence electrons of the atom and not by all the electrons of the atom including the inner electrons.

Explanation:

Lewis electron dot structures are structures that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.

In the Lewis symbol for an atom, the chemical symbol of the element is written, and the valence electrons of the atom are represented as dots surrounding it. Only the electrons in the valence shell are shown using the Lewis electron dot structures.

Lewis structures for molecules show each atom and its position in the structure of the molecule using its chemical symbol. Dots or lines are drawn between atoms to show the electrons that are involved in the chemical bonding between the atoms in the molecule. Valence electrons in each atom that are not involved in bonding known as lone pairs, are represented as pairs of dots, and are placed next to each atom bearing the electron.

Electrons that are not in the valence level are not shown in the Lewis electron dot structures . This is because, the chemical reactivity of an atom of an element is determined by the valence electrons of the atom and not all the electrons of the atom including the inner electrons.

The correct answer is cerium 141,911amu.

A unit atomic mass is defined as one-twelfth of the mass of a single carbon-12 atom. The atomic mass of an element is the atomic mass. Average atomic mass is the weighted average of the atomic masses of all isotopes of that element.

To answer this question, a formula is written to calculate the average atomic mass of cerium. (135.90714 amu × 0.0019 )+ ( 137.90599 amu × 0.0025 )+ ( 139.90543 amu * 0.8843 )+(Ce−142 × 0.1113)

= 140.116

Solving the equation for Ce-142 gives an atomic weight of 141.911 amu.

The correct answer is 141,911 amu. 

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Answer:

860 J / mol

Explanation:

Enthalpy = Energy / no. of moles

no. of moles = mass / molar mass

Take the atomic mass of H = 1.0,

molar mass of H2 = 1.0 x 2

= 2.0

no. of moles of H2 = 9.00/2

= 4.5 mol

Hence,

Enthalpy = 3870 / 4.5

=860 J / mol

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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Answer:

MgCl₂ + H₂ ---> 2 HCl + Mg

Explanation:

Since you have not given any products, I am going to assume that this is a single-displacement reaction. In these types of reactions, an element is being swapped for another in a compound. The unbalanced equation would look like this:

MgCl₂ + H₂ ---> HCl + Mg

Mg does not have a subscript of 2 because it can exist by itself. As you can see, the reaction is not balanced. On the left side, there is 1 Mg, 2 Cl, and 3 H. On the right side, there is only 1 of each. The balanced equation would look like this:

MgCl₂ + H₂ ---> 2 HCl + Mg

Now, there is 1 Mg, 2 Cl, and 2 H on both sides.

Answer: A

Explanation:

Table salts and table sugars are pure substances. The correct option is c.

Pure substances are those substances that are made up of only one kind of atoms. They have definite mass and chemical composition. Some examples of pure substances are salt, sugar, baking soda, etc.

All chemical elements are pure substances. Table salt is an ionic compound that is made up of two elements, sodium, and chloride.  It comes under pure substance as it do not contain any impurities.

Table sugar is a compound that is made up of three elements, carbon, hydrogen, and oxygen. It is a pure substance because it has fixed a chemical composition and no impurities are present in it.  They are crystals.

Thus, the correct option is c. pure substances.

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The relationship between pressure, volume, and temperature of a gas is described by the ideal gas law equation PV = nRT. When the pressure of a gas is tripled while keeping the temperature constant, the volume of the gas will reduce to one-third of its original volume.

According to the ideal gas law equation PV = nRT, an increase in pressure will result in a decrease in volume if the temperature (T) remains constant. In this case, when the pressure is tripled (P becomes three times the original value), the volume (V) must change to compensate and maintain the equation's balance.

Since the temperature is constant, the change in pressure directly affects the volume. When the pressure is tripled, the volume must reduce to one-third of its original value to satisfy the equation. This relationship demonstrates that volume and pressure are inversely proportional when the temperature is held constant.

To illustrate this concept, consider a balloon. If the pressure inside the balloon increases (by blowing air into it), the volume of the balloon decreases as a result. Similarly, if the pressure is decreased (by releasing air from the balloon), the volume increases.

Based on the ideal gas law, when the pressure of a gas is tripled while keeping the temperature constant, the volume of the gas will decrease to one-third of its original volume. This relationship between pressure, volume, and temperature is important to understand when dealing with gases. It also explains why rubber rafts can burst if left in the sun on a hot day due to thermal expansion, where the increased heat causes the air inside the raft to expand, leading to an increase in pressure. Therefore, it is recommended to keep inflatable items in the shade or covered to prevent excessive pressure buildup.

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Answer:

Yes, the bonds of ammonia (NH3) are polar covalent. In a polar covalent bond, the electrons are not shared equally between the atoms involved in the bond, resulting in a partial positive and partial negative charge on the atoms. In the case of ammonia, the nitrogen atom is more electronegative than the hydrogen atoms, so it attracts the shared electrons more strongly towards itself. This creates a partial negative charge on the nitrogen atom and a partial positive charge on each hydrogen atom. This overall uneven distribution of electron density in the molecule makes ammonia polar.

For I₂ under the harmonic oscillator approximation at 300 K, the ratio of molecules in the first excited state (n=1) to the ground state (n=0) can be calculated using the Boltzmann distribution equation. The vibrational energy levels are assumed to be equally spaced, and the proportion of molecules in the first excited state compared to the ground state can be determined.

Additionally, the temperature at which the population in the first excited state is half of that in the ground state can be found by setting up an equation based on the Boltzmann distribution.

The ratio of molecules in the first excited state to the ground state for I₂ at 300 K using the harmonic oscillator approximation, we can use the Boltzmann distribution equation. The energy levels of a harmonic oscillator are given by E = (n + 1/2)hν, where n is the vibrational quantum number, h is Planck's constant, and ν is the vibrational frequency.

a) Ratio of molecules in the first excited state to the ground state:

Since the energy levels are equally spaced, the energy difference between adjacent levels is ΔE = hν. Using the formula ΔE = √(k/μ), where k is the force constant and μ is the reduced mass, we can calculate the vibrational frequency (ν) for I₂.

μ = m1 * m2 / (m1 + m2)  (reduced mass equation)

Plugging in the mass of iodine (I) as 126.9 amu and applying the reduced mass equation, we can find μ.

Once we have ν, we can calculate the energy difference (ΔE) and determine the ratio of molecules in the first excited state (n=1) to the ground state (n=0) using the Boltzmann distribution equation.

b) Temperature at which the population in the first excited state is half of that in the ground state:

To find this temperature, we can set up an equation where the ratio of molecules in the first excited state (n=1) to the ground state (n=0) is 1:2. We can solve for the temperature (T) using the Boltzmann distribution equation.

With the given force constant (k=170 N/m) and the calculated vibrational frequency (ν), we can determine the temperature at which the population in the first excited state will be half of that in the ground state.

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The silver coating on the spoon is produced. When electrolyzing a spoon made from iron with silver, the anode, cathode, and electrolyte that can be used are as follows:

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Answer

D

When your stomach receives food, it contracts and produces acids and enzymes that break down food. When your stomach has broken down food, it passes it to your small intestine.