Please help me with question 7. Thank you so much.

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Complete Question:

A calorimeter measures the heat involved in reactions or other processes by measuring the ______ of the materials _____ the process. The calorimeter is _______ to prevent transfer of heat to outside the device.

Answer:

Temperature; surrounding; insulated.

Explanation:

A calorimeter can be defined as a scientific instrument or device designed and developed for measuring the heat involved in reactions or other processes, especially by taking the measurement of the temperature of the materials surrounding the process.

Basically, a calorimeter is insulated using materials with very high level of resistivity so as to prevent heat transfer to the outside of the device (calorimeter). Some of the components that make up a simple calorimeter are thermometer, an interior styrofoam cup, an exterior styrofoam cup, cover, etc.

Additionally, a calorie refers to the amount of heat required to raise the temperature of a gram of water by one degree Celsius (°C).

Answer:

Temperature; surrounding; insulated.

Explanation:

A calorimeter measures the heat involved in reactions or other processes by measuring the Temperature of the materials surrounding the process. The calorimeter is insulated to prevent the transfer of heat outside the device.

Explanation:

A structure in which valence electrons are depicted by dots is called a lewis structure.

For example, atomic number of oxygen is 8 and its electronic distribution is 2, 6.

Hence, the electron dot structure for [tex]O_{3}[/tex] molecule is as depicted in the picture attached.

Explanation:

+2

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Answer:

the amount of a substance that will dissolve in a given amount of solvent.

Explanation:

Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.

For example, sodium chloride (NaCl) when mixed with water dissociates into sodium and chloride ions. Thus, salt (sodium chloride) is said to be soluble because it dissolves completely in water.

Furthermore, a compound that dissolves completely in water to produce an aqueous solution is said to be soluble in water.

In conclusion, solubility is simply the amount of a substance such as salt, that will dissolve in a given amount of solvent. A solvent is any liquid such as water, coffee, tea, etc., that dissolves a liquid, gaseous, or solid solute to produce a solution.

d. It's impossible to predict whether SA or SB will be greater without more information.

The surface area of an object is the sum of the areas of all its surfaces. It is typically measured in square units, such as square inches or square centimeters. The formula for the surface area of an object depends on its shape.

The surface area of a sphere is given by the formula 4πr^2, where r is the radius of the sphere. Since the volume of the spheres formed by Liquid A and Liquid B is the same (45.0 μL), their radii will also be the same. Therefore, the surface area of the spheres formed by Liquid A and Liquid B will also be the same.

However, it's important to note that this assumes that the two liquids have the same density and viscosity. If the densities or viscosities of the liquids are different, that could affect the size and shape of the drops, and thus the surface area.

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It's impossible to predict whether SA or SB will be greater without more information. The correct answer is: d.

The surface area of a sphere is given by the formula [tex]4\pi r^2[/tex], where r is the radius of the sphere. Given that the volume of the drops is the same, their radii will be different depending on the density of the liquids. The density of Liquid A and Liquid B will determine their respective masses for a fixed volume, which in turn will affect their radii when forming spheres.

If the densities of Liquid A and B are significantly different, the sphere with the higher density liquid will have a smaller radius and thus a smaller surface area, while the sphere with the lower density liquid will have a larger radius and a larger surface area. Conversely, if the densities are similar, the radii and surface areas may also be similar. Therefore, without more information about the densities of the liquids, we cannot accurately predict whether SA or SB will be greater. Hence The correct answer is: d.

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Answer:

Both molarity and molality involves number of moles of solute

Explanation:

Molarity is obtained by dividing the number of moles of solute by the volume of solution in liters. Note that a solution is formed when a solute is dissolved in a given volume of solvent.

Molality, of a solution is obtained by dividing the number of moles of a solute by the number of kilogrammes of solvent.

In both cases, the number of moles of solute is involved. Hence, the number of moles of solute present is common to both molarity and molality calculation.

Answer:

IS IT MULTIPLE CHOICE

Explanation:

Answer:

5.37 × 10⁻⁴ mol/L

Explanation:

A chemist makes 660. mL of magnesium fluoride working solution by adding distilled water to 230. mL of a 0.00154 mol/L stock solution of magnesium fluoride in water. Calculate the concentration of the chemist's working solution. Round your answer to 3 significant digits.

Step 1: Given data

Step 2: Calculate the concentration of the final solution

We want to prepare a dilute solution from a concentrated one. We can calculate the concentration of the final solution using the dilution rule.

C₁ × V₁ = C₂ × V₂

C₂ = C₁ × V₁ / V₂

C₂ = 0.00154 mol/L × 230. mL / 660. mL = 5.37 × 10⁻⁴ mol/L

Answer:

Explosive eruptions from Composite or strato volcano

Explanation:

since they have multiple holes of exit, they can get pretty explosive.

Answer:

0.113 M

Explanation:

The reaction that takes place is:

First we convert 0.3967 g of NaHCO₃ into moles, using its molar mass:

As 1 mol of NaHCO₃ reacts with 1 mol of HCl, in 41.77 mL of the HCl solution there were 4.72x10⁻³ moles of HCl.

With the calculated number of moles and the given volume we calculate the concentration of the solution:

Answer:

764mmHg

Boyle's law

Explanation:

Step 1: Given data

Step 2: Calculate the final volume of methane gas

If we assume constant temperature and ideal behavior, we can calculate the final volume of methane gas using Boyle's law.

P₁ × V₁ = P₂ × V₂

P₂ = P₁ × V₁/V₂

P₂ = 700.0 mmHg × 60.0 mL/55.0 mL = 764mmHg

Answer:

1.90 M

Explanation:

Step 1: Given data

Step 2: Calculate the moles corresponding to 181 g of MgCl₂

The molar mass of MgCl₂ is 95.21 g/mol.

181 g × 1 mol/95.21 g = 1.90 mol

Step 3: Calculate the molarity of the solution

Molarity is equal to the moles of solute divided by the liters of solution.

M = 1.90 mol/1.00 L = 1.90 M

Answer:

CaCO₃(s) + 2 H⁺(aq) + 2 Cl⁻(aq) ⇒ Ca²⁺(aq) + 2 Cl⁻(aq) + H₂O(l) + CO₂(g)

Explanation:

Let's consider the molecular equation that occurs when CaCO₃(s) reacts with HCl(aq).

CaCO₃(s) + 2 HCl(aq) ⇒ CaCl₂(aq) + H₂O(l) + CO₂(g)

The complete ionic equation includes all the ions and the compounds that do not dissociate in water.

CaCO₃(s) + 2 H⁺(aq) + 2 Cl⁻(aq) ⇒ Ca²⁺(aq) + 2 Cl⁻(aq) + H₂O(l) + CO₂(g)

Answer:

H2O.....................

Answer:

do not mix, non-polar, polar

Explanation:

In general, when hydrocarbons like oil are added to water, the two liquids do not mix because hydrocarbons are non-polar and water is polar.

As a general rule of solubility, we say "like dissolves like", meaning polar compounds are soluble in polar solvents and non-polar compounds are soluble in non-polar solvents

This is due to the intermolecular forces, which are dispersion forces for non-polar compounds and dipole-dipole interactions for polar compounds.

Answer:

[tex]m=88.02g[/tex]

Explanation:

Hello there!

In this case, for this ideal gas law problem, it turns out necessary for us to remember that one mole of any gas is contained in 22.4 L at STP and therefore, we can use the following ratio to calculate the moles in 44.8 L of CO2:

[tex]\frac{1mol}{22.4L} =\frac{x}{44.8L}\\\\x= \frac{1mol*44.8L}{22.4L}=2mol[/tex]

Finally, since the molar mass of CO2 is 44.01 g/mol, we calculate the mass as follows:

[tex]m=2mol*\frac{44.01g}{1mol}\\\\m=88.02g[/tex]

Regards!

Answer:

See explanation.

Explanation:

Hello there!

In this case, since this problem  is about gas laws, more specifically about the Gay-Lussac's one since the volume is said to be constant, we can use the following equation for its solution for the final pressure, P2:

[tex]\frac{P_2}{T_2} = \frac{P_1}{T_1}[/tex]

[tex]P_2= \frac{P_1T_2}{T_1}\\\\P_2 =\frac{12.0atm*450K}{300K}\\\\P_2= 18.0atm[/tex]

Thus, we fill in the table as follows:

                           Initial        Final

Pressure           12.0 atm     18.0 atm

Volume                4.0 L         4.0 L

Temperature      300K         450K

Regards!

Answer:

Quantum is the correct answer.

Explanation:

PennFoster

Answer:

2 ion 1+

Explanation:

Solution :

  Term                                                                      Best description

Eriochrome Black T                                                          EBT

Starting color, before titration                               Pale purple-pink color

Molecule that has a high affinity for metal ions       Chelating agent

Ethylenediaminetetracetic acid                                    EDTA

Color at the completion of titration                           Blue-gray color    

Answer: In ethyne due to the presence of a triple bond, the electron density is very high so it is more reactive than ethane.

Explanation:

Answer: The %v/v of the given KCl solution is 7.6%.

Explanation:

Given: Volume of solute = [tex]4.6 \times 10^{1} ml[/tex]

Volume of solution = [tex]6.0 \times 10^{-1} g/ml[/tex]

Formula used to calculate %v/v is as follows.

[tex]\frac{volume of solute}{volume of solution} \times 100[/tex]

Substitute the values into above formula as follows.

[tex]\frac{volume of solute}{volume of solution} \times 100\\\frac{4.6 \times 10^{1}}{6.0 \times 10^{-1}} \times 100\\= 7.6[/tex]

Thus. we can conclude that the %v/v of the given KCl solution is 7.6%.

Answer:

3960/min

Explanation:

The rate constant is expressed in seconds (s): 66 s⁻¹ = 66/s

We know that: 1 min = 60 s

Conversion factor = 60 s/1 min

We multiply the rate constant by the conversion factor to obtain the rate constant expressed in units of minutes:

rate constant = 66/s x 60 s/1 min = 3960/min

The rate constant of a first order reaction in units of minutes is equal to 3960 / min.

Rate constant of any chemical reaction given knowledge about the speed and the direction of the reaction.

In the question, given that

Rate constant of a first order reaction = 66 per sec.

We know that in 1 min = 60 seconds are present.

So, we multiply the given value by 60/1 sec/min to convert into minutes units.

Rate constant of a first order reaction = 66 per sec × 60/1 sec per min = 3960 per min.

Hence, 3960 per min is the rate constant in units of minutes.

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Answer:

The difference is due to the ion-pairing effect which effectively reduces the number of solute particles present in the solution.

Explanation:

Colligative properties are those properties that depend on the amount of solute present. Such properties include; boiling point elevation, freezing point depression etc.

Ion pairing causes the Van't Hoff factor to deviate from whole numbers. Ion pairing effect generally reduces the number of solute particles in solution thereby decreasing the experimental value of the Van't Hoff factor (i).

Hence, the reason why Rita determined the Van't Hoff factor as 1.9 and not the theoretical value of 2 is because of on-pairing effect which effectively reduces the number of solute particles present in the solution.

The difference between the theoretical and experimental is A. The difference is due to the ion-pairing effect which effectively reduces the number of solute particles present in the solution.

It should be noted that colligative properties simply means the properties that depend on the amount of solute present.

The ion pairing causes the Van't Hoff factor to deviate from whole numbers. Therefore, they caused the difference between the theoretical and experimental values.

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Answer:

11 protons 10 neutrons 11 electron

13 protons 14 neutrons 13 electrons

Explanation:

Isotopes are atoms of the same element having same atomic number but different mass numbers.

There are more oxygen atoms in the reactants while there are less oxygen atoms in the product.

Both sides of the equation is supposed to be balanced for a balanced equation. If any one of them isn't balanced, the equation remains unbalanced.

The main reason why the reaction above can not be balanced is:

This chemical reaction SO2 + H2O -> H2SO2 is not correctly written.

It must be: SO2 + H2O -> H2SO3

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