What is an element?​

Answer: Atomic Nucleus!

Explanation: All atoms have a dense central core called the atomic nucleus. Forming the nucleus are two kinds of particles: protons, which have a positive electrical charge, and neutrons, which have no charge.

(Yes, it was from google.)

Answer:

angular momentum

Explanation:

Answer:

The new volume is 5.0L

Explanation:

Given:

Initial pressure (P₁) = 1.4 atm

Initial volume (V₁) = 2.3 L

Final pressure (P₂) = 0.65 atm

We'll use Boyle's Law:

P₁V₁ = P₂V₂

Substituting the given values:

(1.4 atm)(2.3 L) = (0.65 atm)(V₂)

Now, let's solve for V₂:

V₂ = (1.4 atm * 2.3 L) / 0.65 atm

Calculating this expression step-by-step:

V₂ = (3.22 atm·L) / 0.65 atm

V₂ ≈ 4.953 L

Rounded to one decimal place, the new volume is approximately 5.0 L.

For an ideal gas, the internal energy depends only on its temperature. As the process is isobaric, there is no change in the internal energy. ΔU = 0.

We know that for an isobaric process (pressure is constant), the work done by the gas is given by:

W = PΔV

where W is the work, P is the constant pressure, and ΔV is the change in volume.

For an ideal gas, the internal energy depends only on its temperature. As the process is isobaric, there is no change in the internal energy.

Therefore, ΔU = 0.

Answer:ΔU = 0

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Answer:

The three main cycles of an ecosystem are the water cycle, the carbon cycle and the nitrogen cycle. These three cycles working in balance are responsible for carrying away waste materials and replenishing the ecosystem with the nutrients necessary to sustain life.

Explanation:

cycles such as the water cycle keep the earth hydrated by feeding rain to trees, plants, etc.

Answer: Gold Wire

Explanation:

Out of all of these options only gold wire is an element, elements are pure and cannot be broken down by any chemical means

hope it helped, good luck :)

Answer:

I believe Gases A and D

Explanation:

The lines in both gases match up with the lines in the unknown mixture.

Answer:

Fa (rt) and Nitrogen

Explanation:

Answer:

Mass= volume x density

Explanation:

Multiply the density by the volume.

Answer:

314mL OR 0.314L

Explanation:

this requires the dilution formula M1V1 = M2V2 where

M1 = initial concentration

V1 = initial volume

M2 = final concentration

V2 = final volume

In this case, we are solving for V1 where M1 = 5.65M, V1 = 250.0 mL, and M2 = 4.50M

Plugged into the equation we get:

(5.65M)(250.0mL) = (4.50M)V2

divide both sides by 4.50M and it becomes (M cancel)

V2 = 314mL

The correct reactant ratio for the reaction 2Fe + 3Cl2 → 2FeCl3 is 2 moles of iron (Fe) for every 3 moles of chlorine (Cl2).

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Answer:

I think it is stoichiometry

In the bicarbonate buffering system, carbon dioxide and water join to form carbonic acid, which dissociates into hydrogen and bicarbonate.

Bicarbonate is an excellent buffering system because this compound can bind free hydrogen ions (H+) and thus the system avoids sudden changes in the pH of a solution.

In conclusion, in the bicarbonate buffering system, carbon dioxide and water join to form carbonic acid, which dissociates into hydrogen and bicarbonate.

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Answer:

its the first one speed of light

Answer:

speed of light

Explanation:

ed21

Based on the results obtained in the table, the solute is a solid because it has an increase in the amount dissolved as temperature increases.

The correct option is B.

The average kinetic energy of the solute molecules increases along with the solution's temperature. As a result, the molecules have a lower ability to bind together and dissolve more easily. Therefore, when the temperature rises, solid states become more soluble.

However, for solutes that are gas, an increase in temperature decreases the solubility of the gas, and the gas comes out of the solution.

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A pure substance that cannot be broken down into simpler substances is water.

A pure substance is a substance made up of one type of atom or molecule that cannot be broken down into simpler substances. This means that the substance has a fixed chemical composition that does not vary from sample to sample. Examples of pure substances include water, carbon dioxide, and salt.

The pure substance that cannot be broken down into simpler substances is called an element. An element is a substance that is made up of only one type of atom. Examples of elements include hydrogen, oxygen, and iron. Each element has a unique set of chemical and physical properties that distinguish it from other elements.

Elements are organized into the periodic table based on their atomic structure and properties. Elements can combine to form compounds, which are made up of two or more different elements chemically bonded together. Compounds can be broken down into their constituent elements by chemical means, but elements cannot be broken down into simpler substances.

Therefore, elements are considered pure substances that cannot be broken down any further.

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Hence, the probability that the mean cholesterol level of the sample will be greater than 217 is 0.034. Answer: 0.034.According to the given statement, we have the following data.

mean (μ) = 205 mg/dLstandard deviation

(σ) = 35 mg/dLsample size

(n) = 46(a) Probability that the mean cholesterol level of the sample will be no more than 205.To find this, we will use the z-score formula.z

= (x - μ) / (σ/√n)Here,

x = 205

μ = 205

σ =

35n

= 46Plugging in these values, we get,

z = (205 - 205) / (35/√46)

z = 0Hence, the probability that the mean cholesterol level of the sample will be no more than 205 is 0.5. Answer: 0.5

(b) Probability that the mean cholesterol level of the sample will be between 200 and 210:

To find this, we need to standardize the values and use the z-table.P(z < (210 - 205) / (35/√46)) - P(z < (200 - 205) / (35/√46))P(z < 1.65) - P(z < -1.65) = 0.4495 - 0.0505

= 0.3990Hence, the probability that the mean cholesterol level of the sample will be between 200 and 210 is 0.3990. Answer: 0.3990

(c) Probability that the mean cholesterol level of the sample will be less than 195: To find this, we need to standardize the values and use the z-table.P(z < (195 - 205) / (35/√46))P(z < -2.91) = 0.002Hence, the probability that the mean cholesterol level of the sample will be less than 195 is 0.002. Answer: 0.002

(d) Probability that the mean cholesterol level of the sample will be greater than 217: To find this, we need to standardize the values and use the z-table.P(z > (217 - 205) / (35/√46))P(z > 1.82) = 0.034 Answer: 0.034.

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Answer:  Mg(s) +  H2SO4(aq)  + H2(g)

Explanation:

Magnesium sulfate:

Magnesium sulfate is a chemical compound, a salt with the formula .

Magnesium reacts with dilute Sulphur acid to form Magnesium sulfate and Hydrogen gas.

  Mg(s) +  H2SO4(aq)  + H2(g)

This reaction is a single displacement reaction and also exothermic.

Therefore, the balanced chemical equation for the reaction of magnesium solid with sulfuric acid to form hydrogen gas and magnesium sulfate is  

  Mg(s) +  H2SO4(aq)  + H2(g)

.

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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In this experiment, the boiling water in the beaker is used to heat the gas (air) in the flask to a high temperature of approximately 100°C. However, if the student continued heating the flask after all the water in the beaker has boiled away, the temperature of the gas inside the flask will continue to rise.

In this experiment, boiling water is used to heat the gas (air) in the flask to approximately 100°C. When all the water in the beaker has boiled away and the student continues heating, the temperature of the gas in the flask will likely increase beyond 100°C. This is because the heat source will no longer be transferring energy to the water and will instead directly heat the gas in the flask, causing the temperature to rise. This deviation from the intended experimental conditions may lead to inaccurate results or potentially damage the flask or other equipment. This can lead to an increase in pressure within the flask, which could cause it to rupture or explode. It is important to always monitor the heating process and never exceed the recommended temperature or pressure limits to ensure safe and accurate results. In conclusion, the continued heating of the gas in the flask after the boiling water has evaporated can cause dangerous consequences.

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Answer:

159.7 g/mol

Explanation:

The molar mass of Fe2O3 is 159.7 g/mol.

The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.

Gay Lussac's law states that at constant pressure, the volume of gas is directly proportional to the change in temperature. i.e. V ∝ T. From scenario 1 the change in temperature from 300 K to 600 K shows a 100% increase in temperature which corresponds with the expansion and size doubling of the volume of gas.

Hence we can conclude that The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.

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In obtaining the rate of reaction for the reaction of sodium metal and water;

a) -0.005 g/s

b) 0.000217 mol/s

c) 0.00025 g/s

d) 0.0001084  mol/s

The term rate of reaction has to do with the rate at which the reactants are changed to become products or the rate at which the products are seen to appear.

a)  The average rate of decrease of the sodium in g/s is;

Mass of sodium/ time taken

= -(0.075 g / 15  s) = -0.005 g/s

b) The average rate of decrease of the sodium in mol/s;

Number of moles of sodium = 0.075 g/23 g/mol = 0.00326 moles

Given that;

Number of moles/ time taken

= 0.00326 moles/15 s

= 0.000217 mol/s

Given that the reaction equation is;

\(2Na(s) + 2H_{2} O(l) ---- > 2NaOH(aq) + H_{2}(g)\)

c) The average rate of production of hydrogen in g/s = 1/2 * 0.005 g/s

= 0.00025 g/s

d) The average rate of production of hydrogen in mol/s;

1/2 * 0.000217 mol/s

= 0.0001084  mol/s

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Answer:

a

Explanation:

Answer:

nickel 48.1063%

Phosphorus 16.9245%

Oxygen 34.9692%

The percent composition of each element like nitrogen, oxygen and phosphorous in Ni₃(PO₄)₂ are 48.03%, 34.97% and 16.93% respectively.

Percent composition of any element present in any compound will be calculated as:
% comosition = (Mass of element / Mass of compound)×100%

Mass of Ni₃(PO₄)₂ compound = 366.02 g/mol

Molar mass of 3 Nitrogen atoms = 3×58.6 = 175.8 g/mol

Moar mass of 2 Phosphorous atoms = 2×31 = 62 g/mol

Moar mass of 8 Oxygen atoms = 8×16 = 128 g/mol

% comosition of Nitrogen = (175.8/366.02)×100% = 48.03%

% comosition of Oxygen = (128/366.02)×100% = 34.97%

% comosition of Phosphorous = (62/366.02)×100% = 16.93%

Hence % composition of nitrogen, oxygen and phosphorous is 48.03%, 34.97% and 16.93% respectively.

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Answer:

C.

Explanation:

The situation that best describes the effect of a limiting reactant is that when there is not enough A reactant to react with whole B.

The limiting reactant, also known as the limiting reagent, is the reactant that is used first during a chemical reaction, hence restricting the amount of product that can be produced. The limiting reactant can be identified in a variety of methods ,but they all require employing mole ratios from the balanced chemical equation.

The theoretical yield is the maximum quantity of product possible given the limiting reactant. The quantity of product actually procured, or actual yield, is usually always less than the theoretical yield. The percentage yield used to describe the actual yield indicates what portion of the theoretical yield was attained.

In the equation there is only one situation which describes the effect of limiting reagent when there is not enough of A to react with whole B.

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Answer:

.6 M

Explanation:

.45 moles / .750 liters = .6 M

The molarity of 7,756.4 milliliter solution containing 474.2 grams of sugar solution is approximately 0.339 M.

To calculate the molarity of a solution, you need to know the amount of solute (in moles) and the volume of the solution (in liters). In this case, the solute is sugar (\(C_6H_{12}O_6\)), and its mass is given as 474.2 grams.
First, convert the mass of sugar to moles using its molar mass. The molar mass of \(C_6H_{12}O_6\) is approximately 180.16 g/mol:
(6 carbon atoms * 12.01 g/mol) + (12 hydrogen atoms * 1.01 g/mol) + (6 oxygen atoms * 16.00 g/mol) = 180.16 g/mol
Now, convert the mass of sugar to moles:
474.2 g / 180.16 g/mol = 2.63 moles
Next, convert the volume of the solution from milliliters to liters:
7,756.4 mL * (1 L / 1,000 mL) = 7.7564 L
Finally, calculate the molarity of the solution using the moles of solute and the volume of the solution:
Molarity = moles of solute / volume of solution
Molarity = 2.63 moles / 7.7564 L
Molarity ≈ 0.339 M

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The molarity of the 7,756.4 milliliter solution containing 474.2 grams of sugar (C6H12O6) is 0.339 M.

To find the molarity of a solution, we need to use the formula:

Molarity (M) = moles of solute/liters of solution

First, we need to convert the given volume of the solution from milliliters to liters:

7,756.4 milliliters = 7.7564 liters

Next, we need to calculate the moles of sugar (C6H12O6) in the solution. We can use the formula:
moles = mass / molar mass

The molar mass of sugar (C6H12O6) is 180.16 g/mol (the sum of the atomic masses of all the atoms in one sugar molecule). Therefore, the moles of sugar in the solution are:
moles = 474.2 g / 180.16 g/mol
moles = 2.63 mol

Now we can plug in the values we have calculated into the formula for molarity:

Molarity (M) = moles of solute/liters of solution
Molarity (M) = 2.63 mol / 7.7564 L
Molarity (M) = 0.339 M

Therefore, the molarity of the 7,756.4 milliliter solution containing 474.2 grams of sugar (C6H12O6) is 0.339 M.

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