Q:What is the main difference between an element and a compound? A mixture and a pure substance?

Gold is found in various ionic compounds, but one of the most well-known and commercially significant compounds is gold chloride, also known as auric chloride or gold(III) chloride.

The chemical formula for gold chloride is AuCl₃. Gold chloride is an ionic compound composed of gold cations (Au³⁺) and chloride anions (Cl-). It is a yellow-orange solid that is highly soluble in water. Gold chloride can be formed by reacting the gold metal with chlorine gas or by dissolving the gold metal in aqua regia, which is a mixture of concentrated nitric acid and hydrochloric acid.

Gold chloride has several uses and applications. It is commonly used in the field of nanotechnology for the synthesis of gold nanoparticles. These nanoparticles have unique optical, electronic, and catalytic properties, making them valuable in various fields such as medicine, electronics, and materials science.

In addition to gold chloride, gold can also form other ionic compounds with different anions, such as gold bromide (AuBr), gold iodide (AuI), gold sulfide (Au2S), and gold cyanide (AuCN). These compounds have their own unique properties and applications.

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Answer:

b i took the test:)

Explanation:

1.5 atm pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm.

Nitrogen gas has a density of 0.07807 lbs/cubic foot (0.0012506 grams/cubic centimeter) at 32 degrees Fahrenheit and one atmosphere of pressure. At one atmosphere of pressure, nitrogen gas boils at 320.4 degrees Fahrenheit.

Dinitrogen, a colorless and odorless diatomic gas with the formula N2, is created when two of the element's atoms combine at standard temperature and pressure. Around 78% of the atmosphere on Earth is made up of dinitrogen. Diatomic molecules of nitrogen are found and have unusually low melting temperatures (210 °C) and boiling points (196 °C).

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Answer:

The correct formula is...

Nal

Answer:

idrk im sorry and iknow this didnt help bt im sorry

Explanation:

Answer:

D

Explanation:

Among the given compounds, KF and NH\(_3\) act as weak bases in water.

Weak bases are substances that partially ionize in water and have a low affinity for accepting protons (\(H^+\)). Here's a list of the given compounds, and I'll explain which ones are weak bases:

1. KF - Weak base; it forms \(F^-\), which can accept a proton to form HF.
2. Ba(OH)\(_2\) - Not a weak base; it's a strong base due to the presence of the OH- ion.
3. NaCH\(_3\)COO - Not a weak base; it's a salt derived from a weak acid ( CH\(_3\)COOH) and a strong base (NaOH), so it's neutral in the water.
4. HI - Not a weak base; it's a strong acid.
5. CH\(_3\)COOH - Not a weak base; it's a weak acid.
6. NH\(_4\)Cl - Not a weak base; it's a salt derived from a weak base (NH\(_3\)) and a strong acid (HCl), so it's acidic in water.
7. NH\(_3\) - Weak base; it can accept a proton to form \(NH_4^+\).

So, among the given compounds, KF and NH\(_3\) act as weak bases in water.

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To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

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Answer:

The amount of isopropyl alcohol contained in 150 ml of the solution is 117.15 grams

Explanation:

The density of a substance is the mass per unit volume, therefore, we have;

The density of the isopropyl alcohol = 0.785 g/ml at 25°C

The  density = mass/volume

Mass = Density × Volume

The mass of the 150 ml of isopropyl alcohol is therefore;

Mass = 0.785 g/ml × 150 ml = 117.15 g

The amount in grams contained in 150 ml of sample = 117.15 g.

t = 57 min., Therefore, we can say that it takes 57 minutes for cyclopropane's partial pressure to drop from 1 atm to 0.125 atm at 500°C.

Propene (CH3CH=CH2) is produced by the isomerization of cyclopropane, which is a first-order process. A sample of cyclopropane converts to propene in 79 minutes at 760 K.

The reaction is a first-order reaction because it is an isomerization reaction, and its rate constant is expressed in terms of minutes. The sum of the powers or exponents that the concentration terms are raised in the rate law expression can be used to define the order of a reaction.

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The third law of thermodynamics states that a perfect crystalline structure of a pure solid substance has zero entropy at a temperature of 0 K.

Entropy is a measure of disorder or randomness in a system, and as temperature decreases, the molecules in a solid slow down, becoming more ordered and less random. The third law implies that achieving absolute zero is impossible as it would require an infinite amount of time and energy to completely remove all disorder.

Additionally, the third law provides a reference point for measuring entropy and allows scientists to determine the entropy of a substance at any given temperature.

This law has many practical applications, including in the design of materials for use in extreme environments, such as high-temperature superconductors and spacecraft heat shields.

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Answer:

Some thing that is very little and every thing made by

Answer:

Atoms are the basic unit of a chemical element. Atoms are what make up every thing, living and non living alike.

Explanation:

Hope this helps you!

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

0.845mol NaCl

Explanation:

NaCl has a molar mass of 58.44g/mol.

49.3g/58.44g/mol = 0.845mol

Answer:

0.844

Explanation:

if you divide 49.3 by 58.44 it gives you 0.84360027 which you then round up to 0.844. I know my answer is correct cause I just took the test

Answer:

Molar mass and Mass

Explanation:

The relationship between mass and number of moles is given as;

Number of moles = Mass / Molar mass

Mass = 1.6 g

Molar mass of HCl = ( 1 + 35.5 ) = 36.5 g/mol

Number of moles = 1.6 g / 36.5 g/mol

Number of moles = 0.0438 mol

The new volume of the nitrogen gas is 88 ml. The correct answer is not listed in the options given, so it is possible that there is a typo in the question or answer choices.

To solve this problem, we can use the ideal gas law equation, PV = nRT. We know the initial pressure (P1 = 2.0 atm), initial temperature (T1 = 45 degrees c = 318 K), and initial volume (V1 = 25 ml) of the nitrogen gas. We can assume the number of moles of nitrogen gas (n) and the gas constant (R) are constant.
First, we need to convert the initial temperature to Kelvin:
T1 = 45 + 273 = 318 K
Next, we can use the ideal gas law to solve for the number of moles of nitrogen gas:
n = (P1V1) / (RT1)
We can then use the same equation to solve for the final volume (V2) at the new conditions:
V2 = (nRT2) / P2
We know the final pressure (P2 = 1.5 atm) and the final temperature (T2 = -10 degrees c = 263 K).
Plugging in the values:
n = (2.0 atm * 25 ml) / (0.0821 L*atm/mol*K * 318 K) = 0.001988 mol
V2 = (0.001988 mol * 0.0821 L*atm/mol*K * 263 K) / 1.5 atm = 0.088 L = 88 ml
Therefore, the new volume of the nitrogen gas is 88 ml. The correct answer is not listed in the options given, so it is possible that there is a typo in the question or answer choices.

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The separation scheme for the isolation of caffeine from the ground tablets include the steps: Grinding, Extraction, Filtration, Evaporation, Purification, Recrystallization and Drying.

Here is a detailed separation scheme for the isolation of caffeine from ground tablets. Here is a step-by-step procedure:

Grinding: Grind the tablets containing caffeine to a fine powder to increase the surface area for extraction.

Extraction: Perform multiple extractions using a suitable solvent, such as ethyl acetate or dichloromethane. Add the solvent to the powdered tablets and mix thoroughly. Allow the mixture to stand for some time to allow the solvent to dissolve the caffeine.

Filtration: Filter the mixture to separate the solid residue (containing excipients and impurities) from the solvent extract (containing caffeine).

Evaporation: Evaporate the solvent from the filtrate using a rotary evaporator or by allowing it to evaporate naturally. This will leave behind a crude caffeine residue.

Purification: Dissolve the crude caffeine residue in a minimal amount of a suitable solvent, such as hot water or ethanol. Filter the solution if necessary to remove any remaining insoluble impurities.

Recrystallization: Slowly cool the filtered solution to induce crystallization of pure caffeine. Collect the formed crystals by filtration and wash them with a small amount of ice-cold solvent to remove any impurities.

Drying: Allow the purified caffeine crystals to air dry or use a desiccator to remove any remaining moisture.

The resulting product should be relatively pure caffeine. Please note that this is a simplified outline, and specific details may vary depending on the specific extraction and purification techniques used.

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The gas that has a solubility of 26 g per 100 g of water at 56°C is ammonia (NH3).

Ammonia is a colorless gas with a pungent odor and is commonly used in fertilizer production, refrigeration, and as a cleaning agent. It dissolves in water to form ammonium hydroxide, and its solubility increases with increasing temperature. At 56°C, the solubility of ammonia in water is 26 g per 100 g of water.

Ammonia (NH3) is a versatile compound that has many uses in industry, agriculture, and households. Some of its common uses include:

Fertilizer production: Ammonia is used to produce nitrogen-based fertilizers,

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Sugar alcohols are most often used in which of the following products: baked confections and chewing gum.Sugar alcohols are widely used in food products like baked confections, chewing gum, and candies.

The primary function of sugar alcohols is to sweeten foods and provide fewer calories than sugar. In addition, they are used in the making of sugar-free or low-sugar products, and some are naturally found in fruits and vegetables.

The following are some examples of sugar alcohols:

Xylitol,

Sorbitol,

Maltitol,

Erythritol,

Isomalt

Baked confections and chewing gum are the products where sugar alcohols are most often used. Sugar alcohols provide sweetness to these products without causing tooth decay or raising blood sugar levels. Therefore, it is a safe and healthy alternative to sugar.

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Answer:       freezing

Explanation:

when the atoms or molecules in a solid or liquid are moving slower and closer together, it is called brrrrrrrrr freezinf

a) Solute weight in grams: (25*7.5)/100 = 1.875 gm.

b) Because the weight of a solution is equal to the sum of the weights of the solute and solvent,

Solution weight is 100 grams.

Solvent weight in grams: 100 - 1.875 = 98.125 gm.

Given that water has a density of 1 g/ml, the formula to determine how much solute to add to a solution in weight percent is as follows: grams of solute = (wt% solution) x (ml of water) (100 - wt% solution). The ratio of a solute—a material that dissolves—to a solvent—a substance that does not dissolve—determines the concentration of a solution in chemistry. C = m/V, where C is the concentration, m is the mass of the solute dissolved, and V is the overall volume of the solution, is the accepted formula.

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Answer: Option c

Explanation:

In order to achieve the stable electron configuration, the selenium atom obtains two electrons and adopts the Krypton configuration.

The sulfur family, which also comprises selenium, includes tellurium and polonium. Six electrons make up the outermost shell of this family. Particularly for selenium, the electron configuration is 2-8-18-6. Due to the fact that selenium has six electrons in its outermost shell, it can have a variety of valence values. In order to produce its most stable ion, a selenium atom (Se) would gain two electrons.

Since selenium is a member of the oxygen family, often known as group 16, it contains six valence electrons. It searches for two additional electrons to have a whole outer shell of eight electrons.

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SO2, NO2- and CO2 all have resonance structures among all the other species that were mentioned in the question.

The question is incomplete, the complete question is;

Which if any, of the substances had resonance structures? How many resonance structures did each substance have?

CCl4  ,H2O, CO2  ,H2O  ,CH4  ,C2H4  ,CH2O  ,CH3OH  ,CH3NH2  ,NF3  ,[NH4]+ ,[NO2]-  ,SO2 , OF2  ,H2S  ,SF6 , ICl5

Resonance is an idea introduced by Linus Pauling to explain the bonding in compounds where a single Lewis structure can not fully account for the bonding in the molecule. In such compounds, no single Lewis structure satisfactorily explains all the properties of the molecule.

Among the options listed, the following molecules exhibit resonance;

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The density of liquid 1 is greater than the density of liquid 2. Because the liquids do not mix and liquid 1 rests on top of liquid 2 in the U-tube, the denser liquid will be at the bottom and the less dense liquid will be at the top. This is due to the principle of buoyancy, which states that an object will float or sink in a fluid depending on its density relative to the fluid.

I believe the density p1 is greater than the density p2.

Since the liquid is at equilibrium in the open U-tube, the pressure at which the liquids meet should be the same. That is at the position where they are in contact, the pressure that liquid 1 exerts at that point is the same as the pressure exerted by liquid 2 at the point.

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Answer:24

Explanation:axtizent

The correct answer is C. A television

Explanation:

Plasma is a particular state of matter that differs from liquid, solid, and gas because plasma is a gas but contains mainly particles that have lost their electrons or ions. This makes plasma have properties other states do not have. Additionally, plasma is now widely used in technologies, including televisions, this is because plasma is used in thousands of small containers to create the images in a Tv. This leads to high quality and precise images. Therefore, the commercial technology that commonly uses plasmas is a television.  

Answer:

c

Explanation:

edge

\(4.05 * 10 ^{4}\)

To find the pressure in kPa we use the conversion

1 atm = 101.3 kPa

If 1 atm = 101.3 kPa

400 atm = 400 × 101.3 = 40520 kPa

Expressing it in standard form we have the final answer as

4.05 × 10⁴ kPa

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units such as the centimeter of water, millimetre of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

P = F / A

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