please answer all if you can!

Answer:

2Rb(s) + Sr^+(aq) → 2Rb^+ (aq) + Sr(s)

Explanation:

Rubidium has a more negative reduction potential (-2.98 V) compared to strontium (-2.89 V).

Hence, in a redox reaction involving rubidium and strontium, rubidium will be oxidized while strontium is reduced.

The balanced redox reaction equation is obtained from;

Oxidation half equation;

2Rb(s) ---->2Rb^+(aq) + 2e

Reduction half equation;

Sr^2+(aq) + 2e ----> Sr(s)

Overall reaction equation;

2Rb(s) + Sr^+(aq) → 2Rb^+ (aq) + Sr(s)

Answer:

10.4376 g

Explanation:

First we calculate the sum of the weighings:

Then we divide the sum by the number of weighings to calculate the average:

Answer:

e. all the answers above are correct.

Explanation:

A hydronium ion:

a. has the structure H₃O⁺. YES, this is the chemical formula of the hydronium ion.

b. is a hydrated hydrogen ion. YES, it is formed according to the equation:

H⁺ + H₂O ⇒ H₃O⁺

c. is a hydrated proton. YES, since proton is the name given to the hydrogen ion

d. is the usual form of one of the dissociation products of water in solution. YES, according to the following equation:

2 H₂O ⇒ H₃O⁺ + OH⁻

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

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.

Answer:

Explanation:

An electrophilic addition reaction occurs when an electrophile attacks a substrate, with the end result being the inclusion of one or many comparatively straightforward molecules along with multiple bonds.

In the given question, the hydrogen bromide provides the electrophile while the bromide is the nucleophile. The mechanism proceeds with the attack of the electrophile on the carbon, followed by deprotonation. This process is continued with a formation of carbocation and the bromide(nucleophile) finally bonds to the carbocation to form a stable product.

The first diagram showcases the possible various starting molecules for the synthesis while the second diagram illustrates their mechanism.

Answer:

2.39 moles

Explanation:

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

Pressure (P) = 2.34 atm

Volume (V) = 25.6 L

Temperature (T) = 305 K

Number of mole (n) =?

NOTE: Gas constant (R) = 0.0821 atm.L/Kmol

The number of mole of CO₂ can be obtained by using the ideal gas equation as shown below:

PV = nRT

2.34 × 25.6 = n × 0.0821 × 305

59.904 = n × 25.0405

Divide both side by 25.0405

n = 59.904 / 25.0405

n = 2.39 moles

Thus, the number of mole of CO₂ is 2.39 moles.

Answer:

2.39

Explanation:

got it right on a quiz for credit recovery

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.

Answer:

Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they form.

Explanation:

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:

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:

Amine

Explanation:

The functional groups contained in Taxol are :

Ketone , Ester, Amide and Alcohol

while the functional group that is not contained in the Taxol is Amine

Taxol is a very potent anti-cancer chemotherapeutic, and it is also groped into a class called Taxanes and this makes it effective in the treatment of breast and ovarian cancer.

Answer:

2 ion 1+

Explanation:

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.

Explanation:

The answer is halogens

Halogens are reactive non metallic elements that form strongly acidic compounds with Hydrogen to form simple salts

Answer:

Quantum is the correct answer.

Explanation:

PennFoster

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:

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: 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:

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

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:

See explanation

Explanation:

I) from the question;

500 × 10^-3 g dissolves in 100ml

xg dissolves in 1000ml

x = 500 × 10^-3 g × 1000ml/100 ml

x= 5 g/L

Mass concentration = molar concentration × molar mass

Molar concentration = Mass concentration/ molar mass

Molar concentration = 5g/L/419 g/mol

Molar concentration = 0.0119 M

ii) To prepare this solution, measure out 500mg with a weighing balance. Transfer the solid to a standard 100 ml volumetric flask. Make up to the 100ml mark with distilled water.

iii) mass concentration of the solution = 50 g/L

Volume of the solution= 100 ml

Mass of the solid = 50 g/L × 100/1000 L

Mass of solid = 5g

This 5g was taken for 10 days, hence a total of 50 g

Since the normal dose of the drug is 40g for ten days, the patient will suffer from kidney problems because he/she has taken the drug above the recommended dosage.

Answer:

1m = 100cm

3* 1m= 3*100cm = 300cm

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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:

[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]

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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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