Cross-trained athletes have strong muscles to help them provide enough force to accelerate at high speeds while pushing large weights . After training for two weeks, an athlete gets stronger and can apply more force to the weight. If he can now push the weight 75 meters in 25 seconds, what is his average speed, in meters per second?​

Answer:

Otherwise, positive charge means that the element lost an electron and negative charge means it gained an electron. (3) The atomic mass is equal to the sum of the number of protons and number of neutrons. An atom of the calcium-40 isotope has 20 neutrons in its nucleus.

Answer:

tty to fin out what happend by redoing it

Chordae tendinae, also known as "heart strings," are tendons made of connective tissue that play a crucial role in the functioning of the heart.

Chordae tendinae are specialized tendons found in the heart, specifically in the ventricles. They are composed of connective tissue, primarily collagen fibers, and are responsible for anchoring the heart valves, known as the atrioventricular valves (AV valves), to the ventricular walls. The AV valves include the mitral valve, located between the left atrium and left ventricle, and the tricuspid valve, located between the right atrium and right ventricle.

The chordae tendinae extend from the papillary muscles, which are small, muscular projections in the ventricles, to the valve leaflets. When the heart contracts, the papillary muscles also contract, tightening the chordae tendinae and preventing the valves from being forced back into the atria. This mechanism ensures that blood flows in one direction through the heart, allowing for efficient circulation.

The tissue composition of chordae tendinae provides them with strength and flexibility, allowing them to withstand the forces exerted during the cardiac cycle. Their integrity is crucial for maintaining proper valve function and preventing the backflow of blood.

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These observational techniques and technologies enable astronomers to unravel the complex composition of stars and celestial objects, shedding light on the mysteries of the universe.

1. We know what stars are made of through the use of spectroscopy. Spectroscopy is a scientific technique that analyzes the interaction between light and matter. It allows us to study the unique fingerprint of light emitted or absorbed by different elements.

By using spectroscopy, scientists can examine the spectral lines, which are specific wavelengths of light that are either emitted or absorbed by different elements. These spectral lines provide crucial information about the chemical composition of stars and other celestial objects.

Spectroscopy extends beyond the visible range of our eyes. There are different types of spectroscopy, such as ultraviolet, infrared, and X-ray spectroscopy, which allow us to observe spectral lines that are not visible to us directly. These technologies use specialized detectors and instruments to detect and analyze these wavelengths of light, providing valuable insights into the composition of stars and other objects.

2. Our Sun is primarily composed of hot gases. Through spectroscopy, scientists have identified the specific elements present in the Sun's atmosphere. The prominent spectral lines observed in the Sun's spectrum correspond to elements such as hydrogen, helium, and trace amounts of other elements like oxygen, carbon, and iron.

The spectral lines from the Sun match with known spectral lines of these elements, confirming their presence in the Sun's composition. By studying the intensity and characteristics of these spectral lines, scientists can deduce the abundance and temperature of the different gases in the Sun.

3. Let's consider the Orion Nebula as an example of a deep space object. The composition of the Orion Nebula has been studied using a combination of technologies, including optical spectroscopy and infrared observations.

Optical spectroscopy helps to identify the presence of elements such as hydrogen, helium, oxygen, nitrogen, and other trace elements in the nebula. By analyzing the spectral lines emitted or absorbed by these elements, scientists can determine their abundance and temperature.

Infrared observations, on the other hand, allow scientists to probe the dust particles present in the nebula. By studying the infrared emission from the dust, scientists can gain insights into the chemical composition of the interstellar material and molecules present in the Orion Nebula.

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Answer: It will usually form the anion F- since it is extremely electronegative and a strong oxidizing agent. Fluorine is a Lewis acid in weak acid, which means that it accepts electrons when reacting. Fluorine has many isotopes, but the only stable one found in nature is F-19.

Explanation:

The most common ionic form of fluorine is the fluoride ion (F-). Fluorine, as an element, is highly electronegative, meaning it has a strong tendency to attract electrons towards itself.

In the process of forming an ion, fluorine gains one electron to achieve a stable electron configuration, resulting in the fluoride ion.

For example, when fluorine reacts with sodium (Na), fluorine gains one electron from sodium to form the fluoride ion (F-) while sodium loses one electron to become the sodium cation (Na+). This forms an ionic bond between the two ions, resulting in the compound sodium fluoride (NaF).

The fluoride ion is also commonly found in compounds such as calcium fluoride  and aluminum fluoride . In these compounds, fluorine forms ionic bonds with other elements, resulting in the formation of stable compounds.

Overall, the fluoride ion is the most common ionic form of fluorine due to its high electronegativity and its ability to form stable compounds with other elements.

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Answer:

F

Explanation:

has 7 valence electrons , it really want to hog another electron to reach an octet.

therefore it has a highest electronegativity

Answer:

yes

Explanation:

to identify an atom you need to know either it's atomic number or it's proton number

while the neutron is used to determine it's atomic mass

1.60 grams of Argon gas at STP is equal to 11.2 L.

What is standard temperature and pressure?

Standard temperature and pressure (STP) is a set of conditions that are commonly used as a reference point for measuring the properties of gases and other substances. At STP, the temperature is defined as 0 degrees Celsius (273.15K) and the pressure is defined as 1 atmosphere (101.325 kPa).

The volume of a gas at standard temperature and pressure (STP) can be calculated using the ideal gas law:

PV = nRT

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

At STP, the pressure is 1 atm and the temperature is 0°C (273.15 K)

We can use the equation n = m/M , where n is the number of moles, m is the mass and M is the molar mass.

Given that the mass of Argon is 1.60 grams, we can calculate the number of moles:

n = m/M = 1.60/40 = 0.04 mol

We can substitute the value of n, P, T and R into the ideal gas law to calculate the volume.

V = nRT/P = 0.04 mol * 8.314 J/mol*K * 273.15 K / 1atm = 11.2 L

Therefore, 1.60 grams of Argon gas at STP is equal to 11.2 L.

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A fossil fuel is a natural substance formed from the buried remains of ancient organisms that can be used as a source of energy. Fossil fuels formed over millions of years as heat and pressure from layers of sediment changed the decayed organic remains into materials such as coal and petroleum.

Fossils fuels are usually made of fossilized plant and animal remains from millions of years ago. The creation of fossil fuels—either oil, natural gas, or coal—from these fossils is determined by the type of fossil, the amount of heat, and the amount of pressure which they bore.

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Chemicals can affect our lives in a negative and positive way through damaging our organs and weakening our immune system and easing our daily tasks such as cleaning etc.

A chemical is formed as a product when two or more substances react. They also have a known composition which comprises of different elements with unique properties.

Most chemicals are corrosive are dangerous and can enter and irritate the nose, air passages and lungs. This thereby leads to damaging the organs of the body such as lungs etc.

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NaCl is an example of a neutral salt.

Sodium chloride (NaCl) is a neutral salt because it is composed of both a cation (Na+) and an anion (Cl-) that have equal and opposite charges. The positive charge of the sodium ion (Na+) is exactly balanced by the negative charge of the chloride ion (Cl-), resulting in a neutral compound.

When NaCl dissolves in water, the water molecules surround the ions and separate them from each other. The positively charged sodium ions (Na+) are attracted to the negatively charged oxygen atoms in water molecules, and the negatively charged chloride ions (Cl-) are attracted to the positively charged hydrogen atoms in water molecules. This process is called hydration or solvation.

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The standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

What do you mean by standard reaction entropy?

Standard reaction entropy (ΔS°) is a measure of the disorder or randomness of a chemical reaction at a constant temperature and pressure. It is defined as the change in the entropy of the system when a reaction occurs under standard conditions. The standard state for a substance is its pure form at a pressure of 1 bar and a temperature of 25°C (298 K).

The standard reaction entropy (ΔS°) of a reaction can be calculated using the standard molar entropies (S°) of the reactants and products. The formula to calculate the standard reaction entropy is:

ΔS° = ΣS° (products) - ΣS° (reactants)

To calculate the standard reaction entropy for the reaction: N2(g) + 3 H2(g) → 2 NH3(g)

S° (N2) = 191.8 J/K·mol

S° (H2) = 130.6 J/K·mol

S° (NH3) = 192.5 J/K·mol

ΔS° = [2(S° (NH3)) - (S° (N2) + 3(S° (H2))]

ΔS° = [2(192.5) - (191.8 + 3(130.6))] J/K·mol

ΔS° = -196.3 J/K·mol

Hence, the standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

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Answer:

Explanation:

Mechanical energy is basically "manual energy"; ex: hand held sharpener.

Electrical energy is related to electricity. ex: plug

Chemical energy: ex: chemical reaction

Thermal energy "heat". ex: stove

Sound energy "sound waves" ex: speaker

Answer:

A.Tigers

B.Lions

C.Frogs

G.Dogs

H.Cats

I.Eagles

answer:

is Well-Known Member. For a 35" you should be in the 28-32 range on road.

Explanation:

your welcome make brainlist

A drug that contains equal amounts of the R and S enantiomers is a racemic mixture.

A racemic mixture consists of equal proportions of enantiomers, which are molecules that are mirror images of each other but cannot be superimposed.

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Answer:

You have to imagine it

Explanation:

Choosing location in supply chain is 4) All of the above.

Choosing location in the supply chain is one of the main strategic decisions that organizations have to make, itt depends on various factors such as demand and supply forecasting, aggregate planning, and inventory management. An appropriate location enables the firms to provide quality goods and services at the right time and place. The location strategy should consider several factors such as proximity to suppliers, customers, labor availability, transportation, etc.The location decision is important for the success of a business as it affects the cost of production, customer service, and market responsiveness. When a location is chosen, it affects the transportation and inventory cost.

Therefore, firms should consider the tradeoffs between the inventory carrying cost and the transportation cost when choosing a location. For instance, a firm may decide to locate closer to the customers to reduce the transportation cost but will have to incur higher inventory carrying cost due to the storage facilities. Hence, organizations need to carefully choose the best location in the supply chain that meets the needs of their customers and ensures their long-term success. Hence, the correct option is 4) All of the above.

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To sterilize contaminated items, it is important to use a cleaning solution that is specifically designed for sterilization purposes. There are a few different types of solutions that can be used for sterilization, including bleach, hydrogen peroxide, and rubbing alcohol.

Bleach is a common sterilizing solution that is effective at killing bacteria and viruses. To use bleach, mix one part bleach with nine parts water and use it to wipe down contaminated surfaces. Hydrogen peroxide is another effective sterilizing solution that can be used to clean surfaces and sterilize items. To use hydrogen peroxide, simply spray it onto the surface and let it sit for a few minutes before wiping it away. Rubbing alcohol is also an effective sterilizing solution that can be used to clean surfaces and sterilize items. To use rubbing alcohol, simply apply it to the surface and let it dry. In order to ensure that contaminated items are properly sterilized, it is important to follow the instructions provided with the cleaning solution and to use it as directed.

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Answer:

moles or atoms?

Explanation:

you can't have a molecule of any so there's two different answers that I can give you:

how many moles? 1.5

how many atoms? 9.03x10^23 atoms

At STP 1 mole of an ideal gas occupies 22.4L.

33.6 L x 1 mol/22.4 L = 1.5 moles of Neon

1.5 moles Ne x 6.02x1023 atoms/mole = 9.03x1023 atoms

9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP. At STP 1 mole of an ideal gas occupies 22.4L.

The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.

Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.  

At STP 1 mole of an ideal gas occupies 22.4L.

33.6 L x 1 mol/22.4 L = 1.5 moles of Neon

1.5 moles Ne x 6.02x10²³ atoms/mole = 9.03x10²³ atoms

Therefore, 9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP.

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0.84 milligrams of a 2. 000 mg sample remain after 6. 55 years, according to radioactive decay.

Given data,

\(t\frac{1}{2} of Co-60 = 5.20years\)

amount of sample = 2.000mg initially = 0.002grams

According to radioactive decay,

\(N_{t} = N_{0}e^{-λt}\)

(\(N_{0} - 0.002\) )λ = \(\frac{0.693}{t\frac{1}{2} }\) = \(\frac{0.693}{5.20}\)  = 0.133

According to radioactive decay,

\(N_{t} = N_{0}e^{-λt}\)

\(lnN_{t} = lnN_{0}\) - λt

\(lnN_{t}\) = ln0.002 - (0.133×6.55)

       = -6.21 - 0.87 = -7.08 = 0.00084g = 0.84mg

Therefore, 0.84 milligrams of a 2. 000 mg sample remain after 6. 55 years.

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Answer:

solid liquid gas and plasma

Density is a crucial physical quantity for a variety of materials, including liquids, gases, and solids. The temperature at which density is measured is usually specified because density is temperature-dependent and changes with temperature.

This implies that a small change in temperature will have a substantial effect on density.Let's have a look at the connection between temperature and density:T and ρ are the symbols used to represent temperature and density, respectively. It is common knowledge that substances expand when heated and contract when cooled. In the same vein, as temperature increases, the space between the molecules increases, resulting in a decrease in density. Conversely, if the temperature decreases, the molecules move closer together, and the density increases. When we consider the relationship between temperature and density, we can infer that density is directly proportional to temperature. As a result, when the temperature changes, so does the density, and this fluctuation must be specified. Therefore, specifying the temperature at which density is measured ensures accuracy and consistency in measurements. It also allows us to make appropriate comparisons between density values obtained from various sources. In conclusion, specifying temperature when measuring density ensures consistency and accuracy in results.

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Answer:

1. 42.1% sodium, 18.9% phosphorus and 39% oxygen.

2.94.07 percent oxygen and 5.93 percent hydrogen.

3.72.71 percent oxygen and 27.29 percent carbon.

4.CaSO4•2H2O has an accepted value of 20.9%.

5.40.00 percent C,6.73 precent H, 53.28 precent O.

6. 60.0% carbon and 35.5% Oxygen.

Explanation:

you find it by dividing the molar mass of the element times the number of that element over the molar mass of the compound then times by 100

Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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The bases in 2.6 that would make an E1 reaction occur faster than methoxide are II, III, and IV.

The E1 reaction is a two-step reaction that proceeds through the formation of a carbocation intermediate. The rate of the E1 reaction is dependent on the stability of the carbocation intermediate. The more stable the carbocation intermediate, the faster the E1 reaction will proceed.

The bases in 2.6 are all stronger bases than methoxide. Stronger bases will abstract a proton from the alkyl halide more easily, which will lead to the formation of a more stable carbocation intermediate. Therefore, the E1 reaction will proceed faster with stronger bases.

The bases in 2.6 that would make an E1 reaction occur faster than methoxide are:

II: tert-Butoxide is a stronger base than methoxide.

III: Isopropyloxide is a stronger base than methoxide.

IV: Cyclohexoxide is a stronger base than methoxide.

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Complete question:

When the alkylbromide below is treated with methoxide, the Sn2, Sn1, E2, and E1 reactions compete. OCH Compared to methoxide, which of the above bases in 2.6 would make an E1 reaction occur faster? Select all that apply.

I

II

III

IV

V

all of the above

neither

The number of significant figures in a measurement depends on the level of precision of the experimental procedure. Significant figures refer to the number of digits that are reliable in a measurement. For instance, if a measurement is precise to one decimal place, it means that the measurement is reliable up to the first decimal place.

In the case of the volume of 10 mL being intentionally left ambiguous, it implies that the precision of the experimental procedure is not clear. It could be that the experimental procedure was not precise enough to measure beyond the integer value of 10 mL, or it could be that the experimenters intentionally rounded the value to 10 mL for convenience.

To determine the number of significant figures in a measurement, it is essential to consider the precision of the measuring instrument, the level of uncertainty associated with the measurement, and the experimental procedure used. If the measuring instrument is precise to one decimal place, then the measurement can be reliable up to that decimal place.

In conclusion, the number of significant figures in a measurement is determined by the level of precision of the experimental procedure. It is crucial to take care in measuring the quantity to get accurate results and avoid ambiguity.

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The reaction between CH4(g) + 2O2(g) and CO2(g) + 2H2O(l) results in an enthalpy change of -891 kJ/mol.

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Answer:

The question specified 2 moles of potassium chloride. Clearly, there are 2 moles of chloride ions. How many moles of chloride ions in 95.2 g