Suppose you are working with a NaOH stock solution but you need a solution with a lower concentration for your experiment. Calculate the volume of the 1.475 M stock NaOH solution needed to prepare 250.0 mL of 0.1374 M dilute NaOH solution.

Answer:

1. is Molar (with capital M)

2. is molal (m)

Explanation:

By definition, 1 Molar solutions have 1 mol of solute in 1 L of solution and 1 molal solutions have 1 mol of solute in 1 Kg of solvent

Answer:

the answer is 0.078

Explanation:

edge 2021

Answer:

The next answers are

4.96

Wax

oxygen

Calculated based on the chemical equation:

✔ theoretical yield

Measured directly:  

✔ experimental yield

Determined experimentally:  

✔ experimental yield

Determined using stoichiometry:  

✔ theoretical yield

BOTH

ALL OF THE ABOVE

using accurate measurements

using pure chemicals

performing the reaction under the most ideal conditions

Explanation:

I am not sure but rocky bodies ranging from large to small in size

The correct option is B. CaBr2 + 2Na → 2NaBr + Ca because In option B, the reactants CaBr2 and Na are both metals with similar reactivities.

Exothermic reactions release energy and are defined as producing products with higher stability (lower energy) than the reactants. The exothermic reaction that happens during a fire and releases energy in the form of heat and light is the combustion reaction.

In terms of reactivity, the metals that are listed in the periodic table's lower left corner are the most active. Lithium, sodium, and potassium, for instance, all interact with water.

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Question:

Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants?

A. 2AlBr3 + 3Zn → 3ZnBr2 + 2Al

B. CaBr2 + 2Na → 2NaBr + Ca

C. MgBr2 + H2 → 2HBr + Mg

D. BaBr2 + Ca → CaBr2 + Ba

E. 2LiBr + Ba → BaBr2 + 2Li

Answer:0.305g

Explanation:

mass = 79.9x(2.3 x 10^21) / (6.02 x 10^23)

= 0.305

Answer:

.032 M .

Explanation:

Molecular weight of ammonium nitrate is 80  .

3.2 g = 3.2 / 80 moles

= .04 moles

volume = 100 mL = 0.1 L

Molarity of 100 mL solution = .04 moles / 0.1 L

= 0.4 M solution.

Now 2 mL solution of 0.4 M is diluted to a volume of 25 mL .

Using the formula S₁ V₁ = S₂V₂

0.4 M x 2 mL = S₂ x 25 mL

S₂ = .4 x 2 / 25

= .032 M

Hence required concentration is .032 M .

Answer:

In the early 1900's, Paul Drüde came up with the "sea of electrons" metallic bonding

The expected observations for the chemical reaction involving lead nitrate and potassium iodide are as follows as per theory.

Before the reaction, you'd have two separate solutions:

Lead Nitrate solution: This is typically a clear, colorless solution.

Potassium Iodide solution: This is also usually a clear, colorless solution.

REACTION OBSERVATIONS:

As soon as you combine these two solutions, a chemical response takes place, resulting in the almost instantaneous development of a yellow precipitate. Lead iodide is a substance that cannot be dissolved in water.

FINAL APPEARANCE:

The final mixture would have a yellow precipitate (lead iodide) suspended in the solution.

The reaction leads to the formation of lead iodide, a substance with distinctive properties, suggesting a chemical change. The presence of this novel compound is indicated by the yellow hue of the precipitate.

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Answer: The average atomic mass  of naturally occurring silicon  is 28.08

Explanation:

Mass of isotope Si-28 = 27.9769265327

% abundance of isotope Si-28 = 92.2297% = \(\frac{92.2297}{100}\)

Mass of isotope Si-29 = 28.97649472

% abundance of isotope Si-29 = (4.6932)% = \(\frac{4.6832}{100}\)

Mass of isotope Si-30 = 29.97377022

% abundance of isotope Si-30 = (3.0872)% = \(\frac{3.0872}{100}\)

Formula used for average atomic mass of an element :

\(A=\sum[(27.9769265327\times \frac{92.2297}{100})+(28.97649472\times \frac{4.6832}{100})+(29.97377022\times \frac{3.0872}{100})]\)

\(A=28.08\)

Therefore, the average atomic mass  of naturally occurring silicon  is 28.08

Answer:

All substances can be characterized by their unique sets of physical and chemical properties.

The temperature of the columns is 40 degrees. From the image that has been attached to the answer.

We know that in the case of this set up that we would have to read the set up and the position of the lines and the point where we can see the end  of the thread of the mercury line of the thermometer.

The thermometer can be defined as device that can be used in the measurement of temperature and in this case, we are having the temperature of the set up that is shown in the image that is attached.

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The volume occupied by the 0.75 mole of the gas at 295 K and a pressure of 1.5 atm is 12.11 L

From the question given above, the following data were obtained:

Ideal gas equation is written as shown below:

PV = nRT

When we input the given parameters, the volume occupied is obatined as:

1.5 × V = 0.75 × 0.0821 × 295

Divide both sides by 4.31

V = (0.75 × 0.0821 × 295) / 1.5

V = 12.11 L

Thus, from the above calculation, we can say that the volume occupied by the gas is 12.11 L

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When you transfer energy into a substance, the molecules' kinetic energy increases and the correct option is option A.

Kinetic energy is defined as the energy that is produced by an object due to its motion.

To accelerate an object, we have to apply force. To apply force, we need to do work. When work is done on an object, energy is transferred, and the object moves with a new constant speed. We call the energy that is transferred kinetic energy, and it depends on the mass and speed achieved.

Kinetic energy must always be either zero or a positive value.

Therefore, When you transfer energy into a substance, the molecules' kinetic energy increases and the correct option is option A.

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The value of S2 is S₂ = 2.1 g/L.Approximately 2.1 g of the gas will dissolve in 2 L of water at 0.6 ATM, assuming the temperature remains constant.

To determine the amount of gas that will dissolve in 2 L of water at 0.6 ATM, we can use Henry's law, which states that the solubility of a gas is directly proportional to the partial pressure of the gas above the liquid.

According to Henry's law, the solubility of a gas can be represented as:S₁/P₁ = S₂/P₂,,where S₁ and S₂ are the solubilities of the gas at the respective pressures P₁ and P₂.Given that 7 g of the gas dissolves in 1 L of water at 2.0 ATM, we can consider this as our initial condition, denoted by S₁/P₁.

Now, we need to find the solubility at 0.6 ATM in 2 L of water, denoted by S₂/P₂.Since the temperature remains constant, we can assume that the solubility of the gas does not change. Therefore, we can rewrite the equation as:

S₁/P₁ = S₂/P₂,

Substituting the known values, we have:

(7 g/1 L)/(2.0 ATM) = S₂/(0.6 ATM),

Solving for S₂, we get:

S₂ = (7 g/1 L) * (0.6 ATM)/(2.0 ATM),

S₂ = 2.1 g/L.

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Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

The body of scientific knowledge is based on different Observations (Option C).

Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.

In conclusion, the body of scientific knowledge is based on different Observations (Option C).

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Answer:

An atom contains three basic particles namely protons, neutrons and electrons. The nucleus of the atom contains protons and neutrons where protons are positively charged and neutrons are neutral. The electrons are located at the outermost regions called the electron shell.

Answer:

343g H2SO4

Explanation

1. H2SO4 is the solute

2. Water is the solvent

3. Molarity = moles of solute / liter of solution = n / V

(Note the case of the letters is important in science. N stands for Normal in chemistry a type of concentration, n stands for the number of moles)

Rearrange the formula to find n

n = M x V

Here are the known values,

M = 3.5M

n = x mol

V = 1.00L

Plug it in and solve for n (the number of moles of H2SO4 in the solution)

n = 3.5M x 1.00 L = 3.50 mol of H2SO4

Molecular mass of H2SO4 is 1g/mole H x 2 + 32.1g/mol S + 16g/mol O x 4 = 98.1g/mol H2SO4

mass = number of mole x relative molecular mass

mass = n x 98.1g/mol

mass = 98.1g/mol H2SO4 x 3.50mol H2SO4

= 343g H2SO4 <-answer

The mass of H2SO4 needed to make a 3.50M solution that has a volume of 1.00L is 343grams.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.

However, the number of moles of the substance must first be calculated as follows:

Molarity = no of moles/volume

3.5M = n/1L

n = 3.5moles

molar mass of H2SO4 = 98g/mol

mass of H2SO4 = 98 × 3.5

mass of H2SO4 = 343g

Therefore, the mass of H2SO4 needed to make a 3.50M solution that has a volume of 1.00L is 343grams.

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Taking into account the definition of calorimetry, the heat Q when 22.0 g of water is heated from 40.0°C to 100.0°C is 5,525.52 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

In other words, sensible heat is the calorific energy that, supplied or removed from a body or an object, causes its temperature to change without affecting its molecular structure and therefore its phase.

The expression for sensible heat is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

Q = 4.186 J/gC× 22 g× 60 °C

Solving:

Q= 5,525.52  J

Finally, the heat Q is 5,525.52 J.

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Answer:

The ameliorated retort, pertaining to the presented and contemporaneous interrogate is acknowledged as B.  

Explanation:

To convey such rhetoric, the following is obligated for comprehension:

- To commence, according to Wikipedia, a "Pure Substance" is defined as: "A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds."

- In addition, invariantly according to Wikipedia, a "Chemical Mixture" is defined as: "In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids."

Hence, veracious retorts are subject to commence.

Given peculiar substances,

H20, an optical isomer is in recognition as a pure substance.

Likewise, CO2, an enantiomer is in the congruence of a pure substance.

Hence, methyl anthranilate acquiring a chemical formula of C8H9NO2, acknowledged as grape flavoring, is a mixture.

Invariantly, the diasteromer epimer, procuring a chemical formula configuration of C12H22O11, sucrose, is acknowledged as a mixture.

Hence, ideologically, the retort in the congruence of veracious philosophy is B. "The pure substances are carbon dioxide and water; mixtures are sugar and grape flavoring."

I hope this helps!

The chemical formula of aspartame is C₁₄H₁₈N₂O₅ and it's relative molecular mass is 294.30 g/mol which is calculated as (12×14)+(1×18)+(14×2)+(16×5).

Molecular  mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molecular mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molar mass and formula mass are used as synonym for the molecular mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molecular masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.In case of aspartame it is calculated as,(12×14)+(1×18)+(14×2)+(16×5)=294.30 g/mol.

Thus , relative molecular mass or molecular mass of aspartame is 294.30 g/mol.

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This problem is providing information about the freezing point depression of a solution consisting of benzene and cyclohexane and asks for the boiling point elevation for the same concentration of solute in the aforementioned solution, which turns out to be C. 80.9°C.

When a liquid homogeneous mixture or a solution is prepared by mixing a solute and and a solvent, the properties it has differ from those of the pure substances, which means we can find a freezing point depression, boiling point elevation and a couple more colligative properties, but these two are the subject of matter here.

In this manner, we can start by using the freezing point depression in order to calculate the the molality of the solution, taking into account that freezing point depression constant depends on the solvent (cyclohexane) only:

\(T_f_{solution}-T_f_{solvent}=-m*Kf_{solvent}\\\\0.0\°C-5.5\°C=-m*20.0\°C/m\\\\m=\frac{-5.5\°C}{-20.0\°C/m} =0.275m\)

By the way, in molal units.

Afterwards, we calculate the boiling point of the solution by using the formula of the boiling point elevation, which, again, depends on the boiling point elevation constant of the solvent:

\(T_b_{,\ solution}-T_b_{,\ solute}=m*Kb_{solvent}\\\\T_b_{,\ solution}-80.1\°C=0.275m*2.79\°C/m\\\\T_b_{,\ solution}=80.1\°C+0.275m*2.79\°C/m\\\\T_b_{,\ solution}=80.9\°C\)

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Explanation:

faster and the substance will be a gas.

According to the forces of attraction and principles of phase change the substance molecules will move faster and the substance will be a gas.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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This question is incomplete, the complete question is;

A buffer solution is prepared by placing 5.86 grams of sodium nitrite and 32.6 mL of a 4.90 M nitrous acid solution into a 500.0 mL volumetric flask and diluting to the calibration mark. If 10.97 mL of a 1.63 M solution of potassium hydroxide is added to the buffer, what is the final pH? The Ka for nitrous acid = 4.6 × 10⁻⁴.

Answer:

the final pH is 3.187

Explanation:

Given the data in the question;

Initial moles of HNO2 = 32.6/1000 × 4.90 = 0.15974 mol

Initial moles of NO2- = mass/molar mass = 5.86/68.995 =  0.0849336 mol

Moles of KOH added = 10.97/1000 × 1.63  = 0.0178811 mol

so

HN02 + KOH → NO2- + H2O

moles of HNO2 = 0.15974 - 0.0178811 = 0.1418589 mol

Moles of NO2- = 0.0849336 + 0.0178811  =  0.1028147 mol

Now,

pH = pka + log( [NO2-]/[HNO2])

pH = -log ka + log( moles of NO2- / moles of HNO2 )

we substitute

pH = -log( 4.6 × 10⁻⁴ ) + log( 0.1028147  / 0.1418589  )

pH = -log( 4.6 × 10⁻⁴ ) + log( 0.724767 )

pH =  3.337242 + (-0.1398 )

pH = 3.187

Therefore, the final pH is 3.187

To compare the effect of force on objects with different forces the acceleration must be constant and the air resistance have to be neglected.

Force is an external agent that acts on body to change it from the state of motion or rest. There are various kind of forces like gravitational force, frictional force, nuclear force etc.

In physics force is the product of mass and acceleration of a moving body. Thus F= ma. Hence, force is directly proportional to the mass and acceleration.

As the mass increases force acting on the body increases. Thus the force acting on 4 kg-metal will be higher.But to compare the same force on these three metal blocks, the acceleration must be constant. One more thing that the air resistance have to be neglected.

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Answer:

1) 37100000

2) 330000000

Explanation:

1) 3.7 x 10^7 = 37100000

2) 3.30 x 10^8 = 330000000

(Hope this helps can I pls have brainlist (crown)☺️)

Answer:hydronium

Explanation:

Step 1

Gases are assumed to be ideal. Therefore, it is used:

p x V = n x R x T

p = pressure = 744.8 torr (1 atm = 760 torr) => 744.8 torr x (1 atm/760 torr) = 0.98 atm

T = absolute temperature = 36.01 °C + 273 = 309.01 K

V = volume

R = gas constant = 0.082 atm x L/mol x K

n = number of moles = mass/molar mass = m/M

-----------------------

Step 2

p x V = n x R x T can be written as:

Answer: Molar mass = 170.83 g/mol

732.806 g of CuSO4 is greater than the maximum amount of CuSO4 that can dissolve (355.25 g), 1750 mL of water would not be able to dissolve 4.6 moles of CuSO4. The solution would become saturated, and any excess CuSO4 would likely remain undissolved as a solid precipitate.

To determine if 1750 mL of water can dissolve 4.6 moles of Copper Sulfate (CuSO4), we need to consider the solubility of CuSO4 in water.

The solubility of a compound indicates the maximum amount of that compound that can dissolve in a given amount of solvent at a specific temperature. In this case, we need to compare the solubility of CuSO4 with the amount we want to dissolve.

Assuming the solubility of CuSO4 in water is 203 g/L at a given temperature, we can calculate the maximum amount of CuSO4 that can dissolve in 1750 mL (1.75 L) of water:

Maximum amount of CuSO4 = Solubility of CuSO4 * Volume of water

Maximum amount of CuSO4 = 203 g/L * 1.75 L = 355.25 g

Next, we can convert the moles of CuSO4 to grams using its molar mass of 159.61 g/mol:

Mass of CuSO4 = Moles of CuSO4 * Molar mass of CuSO4

Mass of CuSO4 = 4.6 mol * 159.61 g/mol = 732.806 g

Since 732.806 g of CuSO4 is greater than the maximum amount of CuSO4 that can dissolve (355.25 g), 1750 mL of water would not be able to dissolve 4.6 moles of CuSO4. The solution would become saturated, and any excess CuSO4 would likely remain undissolved as a solid precipitate.

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