in which aqueous system is caf2 least soluble? group of answer choices 0.8 m kf 0.5 m hf 0.2 m hf 1.0 m hno3 h2o

Answer:

it's volume also decrease

47.1 ml of acetone has a mass of 37.2 g when the density is 0.7899 g/ml.

As stated in the question,

the density of acetone = 0.7899 g/ml

as we know, the mass of a substance per unit of volume is its density which means 0.7899 g ( mass) is present in 1 ml (volume). Hence, by the unitary method:

0.7899 g -> 1ml

1g-> 1/0.7899 ml

37.2 g -> 37.2/0.7899 ml = 47.1 ml

47.1 ml of acetone has a mass of 37.2 g.

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Answer:

increases

Explanation:

it turns out that an object increases as the square of it's speed.

Answer:

Explanation:

In all physical processes taking place in closed systems, the amount of change in kinetic energy is equal to the amount of change in potential energy. If the kinetic energy increases, the potential energy decreases, and vice-versa. this equation reveals that the kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four. so therfore stays the same as the object so it would speed up as well.

Answer:

Crystals Grow and Grow

A crystal is an inorganic (not alive, not from something alive) homogeneous solid (meaning a solid with the same properties at all points) with a three-dimensional, repeated ordering of atoms or molecules

Dalton postulated that, atoms of the same element are identical in all aspects. However, atoms of same element can vary in mass and they for isotopes having slight variations in properties. Hence, it amends the Daltons postulate described in option d.

Dalton's atomic theory states that matter is made of indivisible particles called atoms. Atoms are of same elements are identical in all aspects and atoms of different element combines to form compounds.

However an atom is made of subatomic particles namely, electrons, protons and neutrons. This amends the indivisibility of atom by Dalton's theory,

Similarly an element can form atoms of varying mass. They are called isotopes of the element. Isotopes shows slight variation in properties as well. This amends the postulate of Dalton, that atoms of same element are identical.

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Volume (liters) of aqueous 0.325 M nitric acid is 0.132 L

Reaction

2HNO₃ + Ba(OH)₂ → Ba(NO₃)₂ + 2H₂O

mass of Ba(OH)₂ = 3.68 g

mol Ba(OH)₂(MW=171,34 g/mol) :

\(\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{3.68}{171,34 g/mol}\\\\mol=0.0215\)

From the equation, mol ratio of HNO₃ : Ba(OH)₂ = 2 : 1, so mol HNO₃:

\(\tt mol~HNO_3=\dfrac{2}{1}\times 0.0215=0.043\)

Molarity of HNO₃ = 0.325, then the volume of HNO₃ :

\(\tt V=\dfrac{n(mol)}{M(molarity)}\\\\V=\dfrac{0.043}{0.325}\\\\V=0.132~L\)

Answer: I’m pretty sure your answer is B

Explanation:

Answer:

The answers is B

Explanation:

I did that question before !!

Answer:

The answer is: Because solids are the most sense.

Option (b) is the correct answer.

Explanation:

The distance between molecules in solids r very small.Because they are so close, they can collide very quickly, i.e. it takes less time for a molecule of the solid to 'bump' into its neighbor. Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids.It is true that sound travels faster in solids. This is because in solid substances, molecules are much closer to each other due to which transfer of energy is much faster.

On the other hand, molecules in a liquid and gas are farther apart from each other due to which there will be less transfer of energy. As a result, sound does not travel quickly through liquids and gases.

Thus, we can conclude that sound travels most quickly through solids because the molecules in solids are very close together.

Answer:

yea, what they said.

Explanation:

Answer:

Explanation:

we know that density=mass/volume

mass=240.90 g

volume=200.00 ml

now

density=240.90 g/200.00

density=1.2045 g/ml

another way

1 dm^3 =1000 ml

200.00 ml =200.00/1000

200.00 ml=0.2 dm^3

now density=240.90 g/0.2 dm^3

density=1204.5 g/dm^3

The compound that will undergo Friedel-Crafts alkylation most rapidly with (CH3)3CCl, AlCl3 is acetophenone.

Friedel-Crafts alkylation is a reaction in which an alkyl group is added to an aromatic ring using a Lewis acid catalyst such as AlCl3. In this case, the alkylating agent is (CH3)3CCl, also known as tert-butyl chloride. Among the given options, acetophenone is the most reactive towards Friedel-Crafts alkylation due to its electron-withdrawing carbonyl group.

The carbonyl group in acetophenone activates the aromatic ring towards electrophilic aromatic substitution reactions, such as Friedel-Crafts alkylation. The presence of the electron-withdrawing carbonyl group enhances the electrophilicity of the ring, making it more susceptible to attack by the tert-butyl carbocation formed in the presence of AlCl3. Therefore, acetophenone will undergo Friedel-Crafts alkylation most rapidly compared to the other compounds given.

Among the given compounds, acetophenone will undergo Friedel-Crafts alkylation most rapidly with (CH3)3CCl, AlCl3 due to the presence of the electron-withdrawing carbonyl group, which activates the aromatic ring towards electrophilic aromatic substitution reactions.

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When a molecule loses an electron in a chemical reaction, it has been oxidized. Oxidation involves the loss of electrons, an increase in oxidation state, or a decrease in the number of bonds to hydrogen. This process is often associated with the molecule's reaction with an oxidizing agent or the molecule acting as a reducing agent itself.

In a chemical reaction, when a molecule loses an electron, it undergoes oxidation. Oxidation is characterized by the loss of electrons from an atom or molecule, resulting in an increase in its oxidation state. This can be observed by a decrease in the number of bonds to hydrogen or an increase in the number of bonds to more electronegative atoms.

The process of losing an electron often occurs when a molecule reacts with an oxidizing agent. The oxidizing agent accepts the electron from the molecule, causing the molecule to be oxidized. Alternatively, a molecule can act as a reducing agent, donating electrons to another molecule or atom and undergoing oxidation itself.

In summary, when a molecule loses an electron in a chemical reaction, it has been oxidized.

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When a molecule loses an electron in a chemical reaction, the molecule has been oxidized.

When a molecule loses an electron, it undergoes oxidation, which is the process of losing electrons or an increase in its oxidation state. This electron loss can occur during various chemical reactions, such as oxidation-reduction (redox) reactions.

Oxidation involves the transfer of electrons from one species to another. The molecule that donates the electron is called the reducing agent, as it causes the reduction (gain of electrons) of another species.

The molecule that accepts the electron is called the oxidizing agent, as it causes the oxidation (loss of electrons) of the other species.

This transfer of electrons is crucial in many biological and chemical processes, including energy production and electron transport chains.

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Answer:

Gamma ray

Hope this helps!!!!!!!!

Answer: They're called Periods

periods of the periodic table

Any one of the 7 chemical elements that compose Group 18 (VIIIa) of a periodic table is referred to as a noble gas. The noble gases generally inflammable, tasteless, colorless, and odorless.

Due to their full valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found at the far right of a periodic table, were formerly known as the "inert gases."

Properties of the noble gas:

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The natural movement of molecules along their chemical gradient.

A molecule is the smallest unit of a chemical compound and is made up of two or more atoms connected by chemical bonds. It has the chemical properties of the compound. The atoms that make up molecules might be of the same kind, as in the case of molecular oxygen (O2), or they can be of different types, as in the case of water (H2O), which is composed of hydrogen and oxygen atoms.

The tendency of molecules is to spontaneously shift from a region of higher concentration to a region of lower concentration along their chemical gradient. Due to the random mobility of individual molecules and their propensity to spread themselves uniformly in space, a concept known as diffusion governs this movement. Natural processes such as diffusion take place in both living and non-living systems, and they are essential to many biological activities like respiration, osmosis, and the transportation of nutrients and wastes.

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The specific heat of the aluminum : c = 0.9 J/g  °C

Given

25 g Aluminum

Temperature from 18°C to 175 °C

Heat = 3.533 J

Required

The specific heat of the aluminum

Solution

Heat can be formulated :

Q = m . c . Δt

Input the value :

c = Q / m . Δt

c = 3,533 / 25 x (175 - 18)

c = 3533/3925

c = 0.9 J/g  °C

The temperature at which the pressure will be equal to 1.75 atm, given that the tank has an initial pressure of 101325 Pa is 257.25 degrees celsius

First, we shall list out the given parameters from the question. This is shown below:

The final temperature can be obtain as follow:

P₁ / T₁ = P₂ / T₂

1 / 303 = 1.75 / T₂

Cross multiply

1 × T₂ = 303 × 1.75

T₂ = 530.25 K

Subtract 273 to obtain answer in degree celsius

T₂ = 530.25 – 273 K

T₂ = 257.25 degrees celsius

Thus, the temperature required is 257.25 degrees celsius

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Answer:

KCl is an Ionic compound

Explanation:

Answer:

color is there right answer for this question please make me a brainliest and follow me please please please please

I can give you some general information about acid deposition and its effects Acid deposition refers to the deposition of acidic substances from the atmosphere onto the Earth's surface, including land, water bodies.

and buildings. This can happen through precipitation such as rain, snow, and fog, as well as dry deposition through the deposition of acidic gases and particles. The effects of acid deposition can include damage to forests, crops, and other vegetation, as well as damage to buildings and infrastructure. It can also lead to acidification of lakes and streams, which can harm aquatic life.

Acid deposition refers to the process where acidic particles or gases are deposited on Earth's surface through rain, snow, fog, or dry particles. This occurs when sulfur dioxide (SO2) and nitrogen oxides (NOx) are released into the atmosphere, primarily from burning fossil fuels. They react with water, oxygen, and other chemicals to form acidic compounds that fall to the ground.

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2 C2H6 + 7 O2 → 6 H2O + 4 CO2 If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

5.20 moles of ethane × 4 moles of carbon dioxide / 2 mole of ethane

= 5.20 × 4 / 2

= 10.4 moles

Thus, If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.

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The concentration of the dye in the stock solution can be calculated using the formula:

Concentration (in mol/L) = Mass of solute (in g) / Molar mass of solute (in g/mol) / Volume of solution (in L)

First, we need to convert the mass of the dye from milligrams to grams:

13.03 mg = 0.01303 g

Next, we can substitute the values into the formula:

Concentration = 0.01303 g / 280.3 g/mol / 0.5 L

Simplifying this expression gives:

Concentration = 0.0000927 mol/L

Therefore, the concentration of the dye in the stock solution is 0.0000927 mol/L.

To explain this further, a stock solution is a concentrated solution that can be diluted to make a solution of a lower concentration. In this case, we are given the mass of the solute (dye) and the volume of the solution (500.0 ml). We are also given the molar mass of the dye, which is the mass of one mole of the dye. This value is used to convert the mass of the dye from grams to moles.

The concentration of the dye in the stock solution is expressed in terms of moles of dye per liter of solution. The concentration is calculated by dividing the mass of the dye by its molar mass, and then dividing by the volume of the solution. This gives us the number of moles of dye per liter of solution.

In summary, the concentration of the dye in the stock solution is 0.0000927 mol/L, which means that there are 0.0000927 moles of dye in each liter of solution.

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Answer:

White color

Explanation:

This compound when heated losses its water of crystallization and become anhydrous copper sulphate

Scientist are able to see smaller cells due to the large scale of magnification of new microscopes.

The term cell refers to the simplest or the smallest unit of an organism. All organisms are composed of cells and cells come from cells. This implies that cells come from the replication of cells in the body.

Now, there are several kinds of microscopes that are in existence such as;

The scale of microscopes continue to improve as technology improves. Thus we have larger magnification and scientist are able to see smaller cells due to the large scale of magnification of new microscopes.

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To calculate the concentration of the iron sample by using a spectrophotometric method, it is necessary to dilute the sample. The volume to which the sample should be diluted is a crucial question in achieving the most accurate result.

The process involves diluting the sample, and the concentration must be calculated to determine the precise result of the dilution. This question can be answered by calculating the uncertainty and identifying the value of the uncertainty. The value with the lowest uncertainty will be the best value to choose. The volume with the lowest uncertainty will be the ideal volume to dilute the 5 ml aliquot of the iron sample to achieve a result with the minimum level of uncertainty.
To determine the optimal volume for dilution, the uncertainty should be calculated.
This can be done by using the equation for propagation of uncertainty, which states that the uncertainty of the result is equal to the square root of the sum of the squares of the uncertainties of the individual components. When calculating the uncertainty of the diluted sample, the uncertainty of the initial sample and the uncertainty of the diluent must be considered. The uncertainty of the initial sample can be calculated using the calibration curve. As the expected iron content is 40-60%, the concentration of the sample is expected to be 8-12 ppm. The uncertainty of the calibration curve is given by the standard deviation of the calibration standards.
The diluent has a negligible uncertainty. The uncertainty of the diluted sample will be lower if a larger volume is used for dilution because the relative contribution of the uncertainty of the initial sample will decrease. However, the uncertainty of the measurement will increase if the sample is diluted too much because the concentration of the analyte will be too low to be detected accurately. A 100 mL volume is a good choice because it balances the need for sufficient dilution to reduce the uncertainty of the initial sample with the need for sufficient concentration to allow for accurate detection of the analyte.

The volume of the sample that should be diluted is 5 ml. The minimum level of uncertainty is obtained at a dilution of 100 ml. When the volume of the diluent is greater than 100 ml, the uncertainty of the measurement increases, and when the volume of the diluent is less than 100 ml, the uncertainty of the measurement also increases. Thus, a 100 ml volume of diluent is the ideal volume to minimize the uncertainty in the analysis of iron.

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The number of mole of HCl required to neutralize all 0.05 mole of Ca(OH)₂ is 0.1 mole

Ca(OH)₂ + 2HCl —> CaCl₂ + 2H₂O

From the balanced equation above,

1 mole of Ca(OH)₂ required 2 moles of HCl

From the balanced equation above,

1 mole of Ca(OH)₂ required 2 moles of HCl

Therefore,

0.05 mole of Ca(OH)₂ will require = 0.05 × 2 = 0.1 mole of HCl

Thus, 0.1 mole of HCl is needed for the reaction

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