a scale uses the principle of. to measure how much something weighs

Answer:

Hence the correct answer is increase, electronegativity.

Explanation:

Oxoacids have the general formula illustrated, where the number of bonds to the central element E can vary. For the same element E, acid strength will increase as the number of O atoms increases. For the same number of O atoms, acid strength increases as the electronegativity of element E increases.

Answer:

what is this question??

Answer:

59.92 × 10²³ atoms are in 9.95 moles of iron

1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide

1.19 moles are found in 7.20 x 10^23 atoms of platinum

In a substitution reaction, the reactant molecule undergoes a structural change by replacing an existing atom or functional group with a new atom or functional group.

In organic chemistry, a substitution reaction is a type of chemical reaction where an atom or a functional group is replaced by another atom or functional group. It involves the substitution of one or more atoms or groups in a molecule with a different atom or group.

In a substitution reaction, the reactant molecule undergoes a structural change by replacing an existing atom or functional group with a new atom or functional group. This process typically occurs when a nucleophile attacks the substrate molecule, leading to the displacement of a leaving group. The nucleophile donates a pair of electrons to form a new bond, while the leaving group is expelled from the molecule.

An example of a substitution reaction is the reaction between an alkyl halide and a nucleophile. In this case, the halogen atom (leaving group) is substituted by the nucleophile, resulting in the formation of a new compound. One common example is the reaction between methyl bromide (CH₃Br) and hydroxide ion (OH⁻) as the nucleophile:

CH₃Br + OH⁻ → CH₃OH + Br⁻

In this reaction, the hydroxide ion (OH⁻) acts as the nucleophile and replaces the bromine atom in methyl bromide (CH₃Br). The bromine atom is expelled as a bromide ion (Br⁻), and a new compound, methanol (CH₃OH), is formed.

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70°C, 95.6 grams of the unknown solute can dissolve in 141.9 grams of water.

The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility. Variable compounds have very varying solubilities, which is a characteristic of a particular solute-solvent pair.

mass of solute = (mass of water) x (solubility of solute in water)

First, we need to convert the solubility from grams of solute per 100 grams of water to grams of solute per gram of water:

67.3 g/100.0 g = 0.673 g/g

Now we can plug in the values to get:

mass of solute = (141.9 g) x (0.673 g/g) = 95.6 g

Therefore, at 70°C, 95.6 grams of the unknown solute can dissolve in 141.9 grams of water.

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A balance can be used to measure the amount of gas being produced by measuring the change in mass before and after the gas is released.

To measure the amount of gas produced, a closed container or reaction vessel is placed on the balance. The initial mass of the container, including the reactants, is recorded. As the reaction proceeds and gas is produced, the total mass inside the container decreases.

By monitoring the change in mass over time, one can determine the amount of gas being produced. The mass difference is attributed to the mass of the gas generated during the reaction.

It is essential to ensure that the reaction vessel is airtight and that no gas escapes during the process. By using a precise and sensitive balance, even small changes in mass can be accurately measured.

This method is commonly used in experiments where the gas produced is difficult to capture directly or when determining the stoichiometry of a reaction involving gases. The balance provides a direct and quantitative measurement of the gas production by monitoring the change in mass.

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Answer:

a

Explanation:

Answer:

1. documenting, tinkering, testing

Explanation:

Technological design is defined as the process of study, design and development of new technologies.

There are some action in the methodical tests and refinements specific to technological design include documenting, tinkering, testing.

Documenting includes collecting all the information about the design and develop the product, tinkering involves repairing or adjust the issues found in the development, and testing helps to evaluate if the product is ready to work as it is supposed to.

Hence, the correct answer is "1."

Answer:

1- number of neutrons

2-  mass

Explanation:

Answer:

Presence of an Electrolyte

Metal Surface

Oxygen or Other Oxidizing Agent

Difference in Potential

Electrochemical Pathway

Explanation:

Answer:

5 significant figures

Explanation:

I have underlined the significant figures in this number:

3 8 5 . 0 1

Answer:

count each wave crest

Explanation:

hope this helps

Answer:

c

Explanation:

I believe its c but i could be wrong sorry if I am

The compression factor based on the information given is 0.083.

The way to calculate the compression factor goes this:

V(ideal) = RT/P

= (0.0821 × 250)/15

= 1.368

V(real) will be:

= V(ideal)/12

= 1.368/12 = 0.114

The compression factor will be:

= 1.368/(12 × 1.368)

= 0.083

Therefore, the compression factor is 0.083.

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To calculate the pressure of dry hydrogen gas (Pdry) in units of atmospheres, we need to use the ideal gas law equation PV=nRT.

Here, we know the volume of hydrogen gas collected, the temperature, and the pressure. However, the gas collected is not dry as it is over water. Therefore, we need to use the Dalton's Law of Partial Pressure to calculate the pressure of dry hydrogen gas.
Firstly, we need to calculate the vapor pressure of water at 20.8 °C, which is 17.535 torr. Then, we can subtract this from the total pressure (760.3 torr) to get the pressure of hydrogen gas over water (Ptotal - Pvap = 742.765 torr).

Next, we need to calculate the moles of hydrogen gas collected. We can use the formula n = PV/RT, where P is the pressure of hydrogen gas over water, V is the volume of hydrogen gas collected, R is the ideal gas constant, and T is the temperature in Kelvin. After converting the temperature to Kelvin (293.95 K), we can calculate the moles of hydrogen gas to be 0.00413 moles.

Finally, we can use the Dalton's Law of Partial Pressure to calculate the pressure of dry hydrogen gas. The total pressure (Ptotal) is the sum of the pressure of hydrogen gas over water (742.765 torr) and the vapor pressure of water (17.535 torr). Therefore, the pressure of dry hydrogen gas is Pdry = Ptotal - Pvap = 725.23 torr. Converting this to atmospheres, we get Pdry = 0.956 atm.

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a. the volume of the gas particle is much smaller than the distance between the gas particles.

Solution: The energy of a molecule does not change when it collides with a container's walls, according to the kinetic theory of gases. Therefore, the assumption is false With the aid of step-by-step solutions offered by experts, you can dispel your concerns and obtain favorable exam results.

The kinetic-molecular theory of gases postulates that ideal gas molecules are perpetually in motion, have a minimal volume, negligible intermolecular interactions, endure collisions that are perfectly elastic.

Keep in mind that ideal gas models are ineffective at low temperatures and high pressures because the gas expands at these conditions.

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The nuclear binding energy per nucleon is the energy required to break apart a nucleus into its constituent protons and neutrons. As the atomic mass number a increases, the number of protons and neutrons in the nucleus increases, which leads to an increase in the nuclear binding energy per nucleon.

Up to a certain point, this increase is due to the strong nuclear force, which is responsible for holding the protons and neutrons together in the nucleus. However, as the atomic mass number a continues to increase, the repulsive electromagnetic force between the protons becomes stronger than the attractive strong nuclear force.
This causes the nuclear binding energy per nucleon to decrease, as the protons in the nucleus repel each other and require more energy to remain bound together. This decrease continues until approximately 8.8 MeV per nucleon, after which the nuclear binding energy per nucleon begins to increase again.
This increase is due to the increasing number of neutrons in the nucleus, which act to stabilize the nucleus and increase the strength of the strong nuclear force. However, the increase in nuclear binding energy per nucleon is not as great as it was before, as the repulsive electromagnetic force continues to exert its influence.
In summary, the nuclear binding energy per nucleon increases up to 8.8 MeV due to the strong nuclear force, but decreases thereafter due to the repulsive electromagnetic force. The increase that occurs after this point is due to the increasing number of neutrons, which partially offset the repulsive force between the protons.

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The number of atoms of 3.0 moles of the particle is  1.807 x 10²⁴ atoms K.

Avogadro's number, which is approximately 6.02 x 10^23 atoms per mole, is used to convert between the number of moles of a substance and the number of atoms (or molecules) in that substance.

Given that you have 3.0 moles of K (potassium), you can use Avogadro's number to calculate the number of atoms in 3.0 moles of K:

3.0 moles K x 6.02 x 10^23 atoms K/mole = 1.807 x 10²⁴ atoms K

So, the correct answer is 1.807 x 10²⁴ atoms K

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Answer:

Explanation:

its B 1mole

D. methane, butane and propane

Propane and butane are both types of alkane hydrocarbons with relatively low boiling points, which allows them to be easily converted to a liquid form at relatively low pressures. This makes them easy to transport and store. Methane, ethane, and hexane are also alkane hydrocarbons, but they are not typically found in large amounts in LPG.

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At a fixed temperature and pressure, a cylinder contains equal volumes of O2 and an unknown gas. The identity of the unknown gas CO.

The number of moles of a given substance is calculated by dividing the mass by the molar mass.

The number of moles of O₂ = \(\mathbf{=\dfrac{20.0 \ g}{32 \ g/mol}}\)

= 0.625 moles.

Based on the given assumption, at fixed temperature and pressure;

The molar mass of the unknown gas can be estimated as:

\(\mathbf{= \dfrac{mass}{number \ of \ moles}}\)

\(\mathbf{= \dfrac{17.5 \ g}{0.625 \ moles}}\)

= 28 g/mol

Therefore, we can conclude that the unknown gas is CO.

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Answer:

9.26g of chlorine

Explanation:

The exact volume of peroxide is needed to be added because it is helpful in knowing about the concentration of the analyte similarly water also should be added knowing its exact volume as it improves the accuracy of the answer required.

a) It is important to know the exact volume of peroxide to be added to the flask in order to ensure that the correct amount of peroxide is used in the reaction and that the reaction has the desired outcome.

By knowing the exact volume of peroxide, the chemist can also ensure that there is no excess peroxide that could cause a dangerous reaction. Additionally, if the correct amount of peroxide is not used, the reaction may not occur correctly or may yield unwanted products. Knowing the exact volume of peroxide also helps the chemist control the reaction rate and the desired product yields. Finally, using the correct amount of peroxide can help prevent contamination of the reaction mixture.

b) It is necessary to know the exact volume of water to be added to the flask for a number of reasons. First, accurate measurement of volume helps to ensure the accuracy of the results from the experiment. If too much or too little water is added, it can skew the results or cause the experiment to fail.

Second, the volume of water will affect the rate of temperature change. If too little or too much water is added, the temperature change may not be as dramatic as desired, or it may take too long to reach the desired temperature.

Finally, the volume of water will affect the amount of energy required to heat the water up. If too much water is added, it can take a long time and require a lot of energy to heat the water to the desired temperature. Knowing the exact volume of water to be added to the flask is critical to ensure the experiment is successful and the results are accurate.

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Answer:

Synthesis

Explanation:

Nothing else works

The number of moles of chlorine in a 67.2 liter sample at STP (Standard Temperature and Pressure), is approximately 3 moles.

We need to use the ideal gas law and the molar volume of a gas at STP.

STP conditions are defined as a temperature of 273.15 Kelvin (0 degrees Celsius) and a pressure of 1 atmosphere (1 atm).

The molar volume of a gas at STP is approximately 22.4 liters/mol.

Given:

Volume of the sample = 67.2 liters

We can use the formula:

n = V / Vm

where:

n = number of moles

V = volume of the sample

Vm = molar volume at STP (22.4 liters/mol)

Now, let's calculate the number of moles:

n = 67.2 L / 22.4 L/mol

n ≈ 3 moles

Therefore, there are approximately 3 moles of chlorine in a 67.2 liter sample of chlorine at STP.

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Answer:

Warmer air can hold more water vapor than colder air.

Explanation:

Weather can be defined as the atmospheric conditions of a particular area over a short period of time.

The elements of weather include precipitation, wind, temperature, atmospheric pressure, relative humidity, cloud, and wind speed.

Temperature can be defined as a measure of the degree of coldness or hotness of a physical object (body).

On the other hand, humidity refers to the concentration (amount) of water vapor that is present in the air. It is high when there's a lot of water vapor in the air and low when the level of water vapor is small.

The relationship between air temperature and humidity is that warmer air can hold more water vapor than colder air because as the air cools, its molecules move closer together while the molecules move farther apart as the air become hot.

Additionally, at constant humidity, relative humidity is inversely proportional to temperature i.e as the temperature decreases, relative humidity increases.

0.411 M  nacl concentration results when 234 ml of a 0.840 m nacl solution is mixed with 492 ml of a 0.210 m nacl solution?

The final concentration of NaCl will be the total moles of NaCl divided by the total volume in liters.

moles NaCl:  

234 mls x 1 L / 1000 ml x 0.840 mol/L = 0.196 mols NaCl

492mlx x 1 L / 1000 ml x 0.210 mol/L = 0.103mols NaCl

Total moles = 0.196 + 0.103 = 0.299 moles NaCl

Total volume (L) = 0.234 L + 0.492 L = 0.726 L

Final [NaCl] = 0.299 mols / 0.726 L = 0.411 M (3 sig. figs.)

In 250 mL of a 0.5 M NaCl solution, how many moles of sodium chloride are there?

This leads us to the conclusion that there are 0.125 moles and 7.32 grams of sodium chloride, respectively, in 250 mL of a 0.5 M NaCl solution.

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Answer:

Find the length of side x in simplest radical form with a rational denominator.

Answer:

The answer is C

radioactive elements can decay into stable or unstable elements.

Answer:

It will not dissolve in water.

Explanation:

You're welcome

If something is insoluble it means that it will not dissolve in water. Therefore, option B is correct.

Solubility can be defined as the maximum amount of Solute that can dissolve in a known solvent at a particular temperature. By changing the temperature of the solution, we can increase the solubility of a substance. Sparingly soluble solids or liquids can be fully liquified by increasing the temperature.

Solubility depends on the nature of the given solute and the solvent. Substances such as sugar, NaCl, etc dissolve in water while substances such as naphthalene can not dissolve in water.

An insoluble substance can be defined as a substance or solid that will not dissolve in a solvent even after mixing such as sand. For example, Sand, Stones, Oil, Flour, and wax. Examples, of soluble things, are Salt, Sugar, Vinegar, Coffee, and Lemon Juice.

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