Identify the homogeneous mixture among the following:
fog
air
milk and cereal mixture
ice cubes in soda

Answer:

Physical properties such as size, shape, color, density, magnetism or the ability to sink or float can be used to separate the substances in a mixture.. Filtration is when matter is passed through a filter and the larger particles are separated out.

Explanation:

Answer:

1 x 10^-7 or 7

Explanation:

pH=-log(H+)

pH+pOH=14

Answer:

positive ion.

Explanation:

It lost 3 negative charges (the electrons) so the remaining atom would have a positive charge.

Neither the protons nor neutrons are lost or gained in this step, so there are no isotope structures involved.

To find the number of moles represented by a certain number of particles, you can use Avogadro's number and the concept of molar mass.

Avogadro's number (symbolized as N_A) is a fundamental constant that represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 × 10²³ particles/mole.

Molar mass is the mass of one mole of a substance and is expressed in grams/mole. It represents the sum of the atomic masses or molecular masses of the constituent particles in a substance.

To calculate the number of moles, you can follow these steps;

Determine the number of particles you have (atoms, molecules, ions, etc.).

Identify the molar mass of the substance or the average molar mass if it's a mixture.

Divide the number of particles by Avogadro's number to convert them into moles. The formula is:

Moles = Number of Particles / Avogadro's number

Moles = Number of Particles / (6.022 ×10²³ particles/mole)

The result will give you the number of moles represented by the given number of particles.

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--The given question is incorrect, the correct question is

"Explain how you would find the number of moles that are represented by a certain number of representative particles."--

Compound, according to our last session.

the molar concentration of the resulting NaCl solution is 0.804 mol/L.

The molar concentration of the NaCl solution can be calculated using the equation:

C = n/V,

where C is the molar concentration, n is the amount of substance (in moles), and V is the volume of the solution (in liters).

Given that the sample has a mass of 23.5 g and the molar mass of NaCl is 58.44 g/mol, we can calculate the amount of substance (n) in the sample:

n = 23.5 g / 58.44 g/mol = 0.402 mol

The volume of the solution (V) is equal to the volume of the Erlenmeyer flask, which is 0.500 L:

V = 0.500 L

Therefore, the molar concentration of the NaCl solution can be calculated as follows:

C = 0.402 mol / 0.500 L = 0.804 mol/L

Therefore, the molar concentration of the resulting NaCl solution is 0.804 mol/L.

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Answer:

NaOH

Explanation:

NaOH is among the water soluble bases

A brachiopod is the type of fossil found at Station 1. Trilobites are the type of fossil found at Station 2. A gastropod is the type of fossil found at Station 3. A crinoid is the type of fossil found at Station 4. Ammonites are the type of fossil found at Station 5.

As index fossils, brachiopods are used to specify and categorise geologic periods. They are also used to study ecological changes, such as those that occurred 500 million years ago during the Great Ordovician Biodiversification Event.

They have two valves or shells, which are frequently made of the mineral calcite (calcium carbonate). The lophophore, which is a coiled feeding apparatus in brachiopods, is shielded by the valves on it.

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I BELIVE ITS 5 SORRY IF THATS WRONG BUT IM SURE

Answer:

B . Water molecules can collide with other particles more than neon atoms can.

Beryllium (Be) will form an ionic compound with nitrogen with the general formula M\(_3\)N\(_2\). Therefore, the correct option is option D.

Metal refers to any of a class of substances that have excellent electrical and thermal conductivity, malleability, flexibility, or light reflection. Metals account for over 75% of any and all chemical elements currently known.

Aluminum, iron, salt, potassium, and magnesium are the most abundant elements in the Earth's crust. Most metals can be found in ores, while some, such as copper, gold, platinum, even silver, are frequently found in their free state because they do cannot easily react with other elements. Beryllium (Be) will form an ionic compound with nitrogen with the general formula M\(_3\)N\(_2\).

Therefore, the correct option is option D.

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Density =mass/volume

=6/3

=2

The speed of the mass is 12.57m/s

The speed of a mass that is spinning in a horizontal circular path can be determined using the relationship between speed, radius, and period of revolution.

The speed of an object in a circular path is given by the formula:

Speed = 2 * pi * radius / period

In this case, we know that the radius of the path is 0.5 m and the period of revolution is 0.25 s, so we can substitute those values into the formula:

Speed = 2 * pi * 0.5 m / 0.25 s

The speed of the mass would be:

Speed = 4 * pi m/s = 12.57m/s

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The next step in the reaction mechanism is the removal of an acidic hydrogen from the carbon adjacent to the electron-deficient carbon (the carbocation) by the chloride ion. This step is known as deprotonation.

Deprotonation occurs when the chloride ion, which is a nucleophile, attacks the carbocation, which is an electrophile. The chloride ion donates its lone pair of electrons to form a new bond with the carbon, resulting in the transfer of the hydrogen atom from the carbon to the chloride ion. This forms a new molecule in which the chloride ion is now bonded to the carbon, and the hydrogen atom is released as a proton.

This deprotonation step helps stabilize the carbocation intermediate by reducing its positive charge. It also forms a new bond, completing the reaction and resulting in the formation of the final product. Overall, the deprotonation step plays a crucial role in the reaction mechanism by allowing the carbocation to react further with the chloride ion, leading to the formation of the desired product.

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The amount of energy required to melt 64 g of methane at 90 k is 3.784 KJ.

The energy required to melt 64 g of methane (CH4) at 90 K can be calculated using the heat of fusion, which is the amount of heat energy required to change the state of a substance from solid to liquid at a constant temperature.

Heat of fusion, also known as the enthalpy of fusion, is the amount of heat energy required to change the state of a substance from solid to liquid at a constant temperature. It is typically expressed in units of joules per mole (J/mol) or kilojoules per mole (kJ/mol).

Heat of fusion is an important physical property of a substance, as it determines the amount of energy required to melt a solid at a given temperature. It is used in many applications, including thermodynamics, process design, and energy storage.

First, we need to convert the amount of methane from grams to moles:

64 g CH4 / 16 g/mol = 4 mol CH4

Next, we can use the heat of fusion to calculate the energy required to melt the methane:

Heat of fusion = moles * heat of fusion per mole

Heat of fusion = 4 mol * 0.946 KJ/mol = 3.784 KJ

Therefore, the energy required to melt 64 g of methane at 90 K is 3.784 KJ.

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Answer:

J. J. Thomson

Explanation:

This is called the plum pudding model which was proposed by J. J. Thomson.

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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Answer:

The equation for percent composition is (mass of element/molecular mass) x 100.

please mark me as a brainlist

Answer:

Chlamydia, gonorrhoeah, syphilis, and trichomoniasis

Explanation:

Answer:

The four examples of STIS

The camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

To calculate the amount of protein the camel consumed, we need to consider the dry matter basis of the hay. Here's how you can calculate it:

Calculate the dry matter weight of the hay:

Dry Matter Weight = Total Weight of Hay × Dry Matter Percentage

Dry Matter Weight = 18.3 kg × (83.4/100)

Dry Matter Weight = 18.3 kg × 0.834

Dry Matter Weight = 15.2442 kg

Calculate the protein content in the dry matter;

Protein Content = Dry Matter Weight × Protein Percentage

Protein Content = 15.2442 kg × (14.7/100)

Protein Content = 15.2442 kg × 0.147

Protein Content = 2.2414194 kg

Therefore, the camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

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Answer:

D.

Explanation:

The electron cloud has negligible mass. Most mass come from the nucleus.

Answer:

B.

Explanation: Because it's at the bottom of the layer so it gets least sun and solar energy.

I'll choose Company 2 to provide my company with lye

Given

Company 1 : Theoretical yield :12,000 grams, actually  8,476 grams

Company 2 : Theoretical yield :9,000 grams, actually  7892 grams

Company 3 : Theoretical yield :7,000 grams, actually  4885 grams

Required

compare their efficiency and choose the company

Solution

To determine which company to choose, we must calculate how much percent yield each company produces. The greater the yield, the greater the efficiency. The company that has the most efficiency will be selected

% yield can be formulated :

\(\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\)

\(\tt \%yield=\dfrac{8476}{12000}\times 100\%=70.63\%\)

\(\tt \%yield=\dfrac{7892}{9000}\times 100\%=87.69\%\)

\(\tt \%yield=\dfrac{4885}{7000}\times 100\%=69.79\%\)

Company 2 has the most efficiency

Answer:

Every living organism falls into one of two groups: eukaryotes or prokaryotes. Cellular structure determines which group an organism belongs to. In this article, we will explain in detail what prokaryotes and eukaryotes are and outline the differences between the two.  

Explanation:

Answer:

nucleus

Explanation:

Answer: Measure the density

Explanation: pretty sure the density could identify if it is a mixture or a pure substance

Answer:

              1.47 mol/L

Explanation:

Molarity is given as,

                           Molarity = Moles / Vol in L    ------- (1)

Moles of CaCl₂,

                           Moles = Mass / M.Mass

                           Moles = 535 g / 110.98 g/mol

                           Moles = 4.82 mol

Now, putting values in eq. 1.

                           Molarity = 4.82 mol / 3.28 L

                           Molarity = 1.47 mol/L

Answer:

Explanations:

Here,we want to get the new pressure of the gas

To get this, we have to use the gas law that relates volume and pressure

This is the Boyle's law and it can be represented as follows:

Where 1 represents the initial values and 2 represents the final values

We have to convert the volumes to the same scale

We have to convert the liters to ml by multiplying by 1000

We have this as 1.42 * 1000 = 1420 mL

The values are:

Initial

Pressure = 21.31 kPa

Volume = 342.41 mL

Final

Pressure =?

Volume = 1420 mL

We substitute the values as follows:

The percentage yield of the reaction is 60%. To find the percentage yield of the reaction, we need to first calculate the theoretical yield of carbon dioxide (CO2).

CH4 + 2O2 → CO2 + 2H2O From the equation, we see that 1 mole of CH4 reacts with 2 moles of O2 to produce 1 mole of CO2. Therefore, we need to calculate the moles of both CH4 and O2 in the given mixture and determine which reactant is limiting the reaction.

The molar mass of CH4 is 12 + 4(1) = 16 g/mol. Therefore, the number of moles of CH4 present in the mixture is:

15 g / 16 g/mol = 0.9375 mol

The molar mass of O2 is 2(16) = 32 g/mol. Therefore, the number of moles of O2 present in the mixture is:

52.5 g / 32 g/mol = 1.6406 mol

According to the balanced equation, 1 mole of CH4 reacts with 2 moles of O2 to produce 1 mole of CO2. Therefore, the maximum number of moles of CO2 that can be produced from the given amounts of CH4 and O2 is:

0.9375 mol CH4 × (1 mol CO2 / 1 mol CH4) = 0.9375 mol CO2

Since 1.6406 mol O2 is more than enough to react with the 0.9375 mol CH4, O2 is in excess and CH4 is the limiting reactant. Therefore, the theoretical yield of CO2 is:

0.9375 mol CO2 × (44 g/mol CO2) = 41.25 g CO2

Now we can calculate the percentage yield of the reaction:

Percentage yield = (actual yield / theoretical yield) × 100%

The actual yield of CO2 is given as 24.75 g. Therefore, the percentage yield is:

(24.75 g / 41.25 g) × 100% = 60%

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Comparing the calculated value of Ca(OH)2 required with the actual amount of Ca(OH)2 added. Ca(OH)2 added = 0.090 mol/L.∴ Ca(OH)2 added < Ca(OH)2 requires Ca(OH)2 added < Ca(OH)2 required, all of the Ca(OH)2 will be consumed. Therefore, the number of moles of HNO2 will decrease, which makes statement A true. So, statement A is True.

The reaction's balanced equation shows that 2 moles of HNO2 react with 1 mole of Ca(OH)2. This implies that the amount of NO2- in the solution remains the same because the reaction does not include NO2-.Therefore, the number of moles of NO2- will remain the same, which makes statement B false. So, statement B is False.

Using Le Chatelier's principle, we can see that adding Ca(OH)2 to a solution of HNO2 and KNO2 will raise the pH by decreasing the concentration of H+. Hence, the equilibrium concentration of H3O+ will increase. So, statement C is True. Therefore, statement C is True.

The pH of the solution increases as the concentration of OH- increases. Adding Ca(OH)2 to a solution of HNO2 and KNO2 increases the concentration of OH-. Therefore, the pH will increase, making statement D True. Therefore, statement D is True.

The ratio of [HNO2] / [NO2-] will not increase. The number of moles of NO2- remains the same as no NO2- is involved in the reaction with Ca(OH)2. As the number of moles of HNO2 decreases, the ratio [HNO2]/[NO2-] decreases, making statement E false. Therefore, statement E is False.

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Answer:

the red line

Explanation: