Imagine that one night on the news, you saw a report that chemists had discovered a medicine to cure cancer. Would you believe that this report was true? What questions would you want to see answered in the report to help you make your decision? Answer in two to three paragraphs.

The question is incomplete. Here is the complete question.

When 2.10 g of a certain molecular compound X are dissolved in 65.0 g of benzene (C₆H₆), the freezing point of the solution is measured to be 3.5°C. Calculate the molar mass of X. If you need any additional information on benzene, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 2 significant digits.

Answer: MM = 47.30 g/mol.

Explanation: There is a relationship between freezing point depression and molality. With this last one, is possible to calculate molar mass or molar weight of a compound.

Freezing Point Depression occurs when a solute is added to a solvent: the freezing point of the solvent decreases when a non-volatile solute is incremented.

Molality or molal concentration is a quantity of solute dissolved in a certain mass, in kg, of solvent. Its symbol is m and it's defined as

\(m=\frac{moles(solute)}{kg(solvent)}\)

Freezing point depression and molal are related as the following:

\(\Delta T_{f}=K_{f}.m\)

where

\(\Delta T_{f}\) is freezing point depression of solution

\(K_{f}\) is molal freezing point depression constant

m is molality

Now, to determine molar mass, first, find molality of the mixture:

\(\Delta T_{f}=K_{f}.m\)

\(m=\frac{\Delta T_{f}}{K_{f}}\)

For benzene, constant is 5.12°C/molal. Then

\(m=\frac{3.5}{5.12}\)

m = 0.683 molal

Second, knowing the relationship between molal and moles of solute, determine the last one:

\(m=\frac{moles(solute)}{kg(solvent)}\)

\(mol(solute)=m.kg(solvent)\)

mol(solute) = 0.683(0.065)

mol(solute) = 0.044 mol

The definition for Molar mass is the mass in grams of 1 mol of substance:

\(n(moles)=\frac{m(g)}{MM(g/mol)}\)

\(MM=\frac{m}{n}\)

In the mixture, there are 0.044 moles of X, so its molecular mass is

\(MM=\frac{2.1}{0.044}\)

MM = 47.30 g/mol

The molecular compound X has molecular mass of 47.30 g/mol.

Answer:potassium is more reactive than Mg because both lie in the same group and the element potassium has more electropositivity than magnesium

Explanation:

I hope it will help you

Answer: B. Potassium(K)

Explanation:

Answer:

the adjective is the word "famous" because an adjective describes a noun. and ben franklin is the noun here. (or subject.)

Answer:

famous is the adjective, since it is describing Ben Franklin

Hope this helps.

The role played by hydraulic fluid in a hydraulic machine is as a medium for

the transfer of force.

Hydraulic fluid is used primarily in a hydraulic machine for the transfer of

force from one point to another. This makes the system able to perform the

required functions.

Hydraulic fluid also has other functions such as being a coolant and as a

cleaning agent(removal of contaminants) which aren't its major function.

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Answer:

In high altitudes

Explanation:

hope it helps you

The artic tundra biome is found in high altitudes.

Artic tundra biome is the northernmost biome, which covers the land of the arctics with the ice caps.

Climate of this Artic tundra biome is almost cold means the temperature in winter season of this region is about -34 degree celsius and temperature in summer season of this region is about 3 - 12 degree celsius. And it observed generalyy on the northen side.

Hence correct option is (C).

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Answer:

Atomic and ionic size –

As the atomic number increases, the atomic size increases and effective nuclear charge also increases which attracts the outermost shell more effectively. So, as we move left to right means from actinium to lawrencium in the actinide series, there is gradual decrease in the the atomic or ionic radii with increase in atomic number. This steady decrease I atomic size is called actinide contraction. The actinide contraction is analog to the lanthanide contraction.

Cause of Actinide contraction –

The main reason of the actinide contraction is the imperfect shielding of the one 5f-electron by another 5f- electron in the same shell. Due to poor shielding effect of the 5f electrons, effective nuclear charge increases which causes the contraction in atomic size. When one electron is added to the 5f-orbital every time means proton keeps on increasing due to which the nuclear charge increases irregularly which causes the poor shielding effect.

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The rate equation is Rate = k[A]²[B]³, and the reaction has an overall order of 5.

A rate law illustrates how a chemical reaction's rate is influenced by the reactant's concentration. The rate law typically has the formula rate = k[A]n for reactions like aA products, where k is the proportionality constant also known as the rate constant. and The reaction's sequence in relation to A is indicated by n.

Rate = k[A]x[B]y

Rate = k[A]²[B]³

Overall order = 2 + 3 = 5

Therefore, the overall order of the reaction is 5, and the rate equation is Rate = k[A]²[B]³.

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Answer:

1.) 0.619 M

2.) 6.34 L

3.) 12.7 moles

Explanation:

Part 1: To find the molarity, you first need to convert grams to moles using the molar mass.

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

143 grams NaCl               1 mole
-------------------------  x  ------------------------  =  2.45 moles NaCl
                                    58.443 grams

Molarity = moles / volume (L)

Molarity = 2.45 moles / 3.95 L

Molarity = 0.619

Part 2: To find the volume, you need to use the given moles and the previously calculated molarity.

Molarity = moles / volume (L)

0.619 M = 3.93 moles / volume

(0.619 M) x volume = 3.93 moles

volume = 6.34

Part 3: To find the moles, you need to use the given volume and the previously calculated molarity.

Molarity = moles / volume (L)

0.619 M = moles / 20.55 L

12.7 = moles

Answer:

128.4 m

Explanation:

3.604m + 104.29m + 3.1m + 17.41m

Add all the values

= 128.404 m

The significant figure rule for addition is for the sum to have the same number of decimal places as the value with the least number of decimal places. In the addition sentence 3.604m + 104.29m + 3.1m + 17.41m, the value with the least number of decimal places is 3.1, which has 1 decimal place. Therefore, we round our sum so that it also has 1 decimal place.

128.404 m

= 128.4 m

I hope this helps!

The balanced oxidation-reduction equation for the destruction of cyanate ion waste solution from gold-mining operations by treatment with hypochlorite ion in basic solution is:

OCN⁻(aq) + OCl⁻(aq) + 2OH⁻(aq) → CO₂⁻(aq) + N₂(g) + Cl⁻(aq) + H₂O(l)

In this reaction, the cyanate ion (OCN⁻) is oxidized to carbon dioxide (CO₂⁻) and nitrogen gas (N₂), while the hypochlorite ion (OCl⁻) is reduced to chloride ion (Cl⁻). The reaction takes place in basic solution, which provides the hydroxide ions (OH⁻) needed to neutralize the acidic H⁺ ions produced during the oxidation of the cyanate ion.

The reaction is exothermic, releasing heat energy as the products form. This reaction is an effective way to dispose of the cyanate ion waste generated by gold-mining operations, as it converts the hazardous waste into harmless gases and ions.

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Answer: physical

Explanation: water doesn't undergo chemical change when it melts and freezes, because either way frozen or not the molecules are the same. hope i helped ;] BRAINLYEST?????

Answer:

Security

Explanation:

A wireless network consists of good connection with fast speed, convenience, and reliability. Security is a major problem with wireless connection as someone can get your information by joining the same connection as you.

Answer:

Iron is natural. Paper is man-made

Explanation:

Answer:

iron

Explanation:

The energy of combustion for one mole of butane to be approximately 2888.81 kJ/mol.

To calculate the energy of combustion for one mole of butane (C4H10), we need to use the information provided and apply the principle of calorimetry.

First, we need to convert the mass of the butane sample from grams to moles. The molar mass of butane (C4H10) can be calculated as follows:

C: 12.01 g/mol

H: 1.01 g/mol

Molar mass of C4H10 = (12.01 * 4) + (1.01 * 10) = 58.12 g/mol

Next, we calculate the moles of butane in the sample:

moles of butane = mass of butane sample / molar mass of butane

moles of butane = 0.367 g / 58.12 g/mol ≈ 0.00631 mol

Now, we can calculate the heat released by the combustion of the butane sample using the equation:

q = C * ΔT

where q is the heat released, C is the heat capacity of the calorimeter, and ΔT is the change in temperature.

Given that the heat capacity of the bomb calorimeter is 2.36 kJ/°C and the change in temperature is 7.73 °C, we can substitute these values into the equation:

q = (2.36 kJ/°C) * 7.73 °C = 18.2078 kJ

Since the heat released by the combustion of the butane sample is equal to the heat absorbed by the calorimeter, we can equate this value to the energy of combustion for one mole of butane.

Energy of combustion for one mole of butane = q / moles of butane

Energy of combustion for one mole of butane = 18.2078 kJ / 0.00631 mol ≈ 2888.81 kJ/mol

Therefore, the energy of combustion for one mole of butane is approximately 2888.81 kJ/mol.

In conclusion, by applying the principles of calorimetry and using the given data, we have calculated the energy of combustion for one mole of butane to be approximately 2888.81 kJ/mol.

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The activity of the sample containing 1.00 µg of radioactive 223Ra is 5.14 x 10^-5 curies.

We will use the equation

Activity = (number of radioactive nuclei) x (decay constant)

The number of radioactive nuclei can be found using Avogadro's number, which gives the number of atoms in a mole of substance.

For 223Ra, the number of atoms in 1.00 µg (or 1.00 x 10^-6 g) is:

(1.00 x 10^-6 g) / (223 g/mol x 6.022 x 10^23 atoms/mol) = 2.69 x 10^14 atoms

The decay constant is found as:

t1/2 = 11.4 days = 9.84 x 10^5 seconds (since 1 day = 8,6400 seconds)

λ = ln(2) / t1/2 = 7.05 x 10^-9 s^-1

In conclusion, the activity of the sample is:

Activity = (2.69 x 10^14 atoms) x (7.05 x 10^-9 s^-1) = 1.90 x 10^6 Bq

When converted to curries, we have:

Activity = (1.90 x 10^6 Bq) / (3.7 x 10^10 Bq/Ci) = 5.14 x 10^-5 Ci

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The following compounds should be ranked in order of increasing acidity, starting with the least acidic compound at the top: SiH4, H2S, PH3.

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Replacing one gas with another under the same conditions, has no effect on pressure is true for ideal gases but is not always true for real gases.

A theoretical gas known as an ideal gas is made up of several randomly drifting point particles with no interparticle interactions. Because it complies with the ideal gas law, a condensed state equation and can be examined using statistical mechanics, the ideal gas concept is helpful.

Therefore, at room temperature (273 K), nitrogen is an acceptable "ideal gas," although CO2 and H20 may both be condense into liquids at the same temperature by applying pressure.

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The pressure inside the tire is approximately 1.970796 newtons per square centimeter (N/cm²) when measured in those units.

To convert the pressure from pounds per square inch (psi) to newtons per square centimeter (N/cm²), we need to use the conversion factors between these units.

First, let's convert pounds to newtons:

1 pound = 0.45359237 kilograms

1 kilogram = 9.80665 newtons

Next, let's convert square inches to square centimeters:

1 square inch = 6.4516 square centimeters

Now, we can perform the conversion:

1 psi = (0.45359237 kg) × (9.80665 N/kg) / (6.4516 cm²)

≈ 0.070307 N/cm²

Therefore, the pressure inside the tire of 28.0 psi is approximately equal to 28.0 × 0.070307 N/cm², which is approximately 1.970796 N/cm².

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The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called chemical kinetics.

What is Energy?

Energy is a fundamental concept in physics, often defined as the ability to do work. It can take many different forms, including thermal energy, kinetic energy, potential energy, electromagnetic radiation, and chemical energy, among others. Energy can be transferred from one system to another, and it can also be converted from one form to another. The SI unit of energy is the joule (J), although other units such as the calorie and the electronvolt are also used in specific contexts.

The field of chemistry that explains why bromine trifluoride reacts differently than water vapor during a reaction is called reaction kinetics. Reaction kinetics is the study of how fast chemical reactions occur and what factors affect the reaction rate. It takes into account factors such as the nature of the reactants, concentration, temperature, surface area, and the presence of a catalyst or inhibitor.

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Answer:

Explanation:

Ultra-high temp pasteurized milk.

Answer:

chlorine

Explanation:

Answer:chlorine reacts with hydrogen peroxide

Explanation:

Answer: 41.0

Explanation: When you multiply the two numbers you get 41 but you need to have the same amount of significant numbers as the number in the problem with the least significant numbers. I hope this helps

Answer:

metallic bond

because this diagram is electron gas theory which shows metallic bond

The majority of metals are malleable, meaning they can be bent and moulded without breaking.

define moulding ?

architect a shaped outline, especially one used on cornices, etc.

a formed strip of wood, stone, or other material

a moulded item, a decorative recessed or relieved surface, a decorative plane or curved strip for embellishment or finishing

The majority of metals are malleable, meaning they can be bent and moulded without breaking. This is due to the fact that they are made up of layers of ions that can glide over one another when the metal is twisted, hammered, or pushed. Most metals are ductile because the ions slide over one other and may be drawn/pulled into wires, making them excellent for electric cables.

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Answer:

Explanations:

Combustion of an element is the reaction of the element with oxygen gas. The combustion of selenium is as shown below;

The binding energy per nucleon for the ¹⁹F nucleon is equal to 7.786 MeV/nucleon.

Binding energy can be defined as the minimum quantity of energy that is required to remove the particle from the system. Nuclear binding energy can be described as the energy required to dismantle a nucleus of an atom into free neutrons and protons.

The binding energy will be determined from the mass defect. Mass defect is calculated from the difference between the mass observed and the expected combined mass.

Given the mass of the ¹⁹F = 18.9984 a.m.u.

The mass defect for the ¹⁹F can be calculated as:

Δm = \((M _n +M_p) - M_F\)

\(\triangle m =( 9\times 1.0078 + 10 \times 1.0087 )- 18.9984\)

\(\triangle m =0.1588 \;a.m.u.\)

The binding energy for the fluorine can be calculated as:

E = Δmc²

E = 0.1588 × 931.5

E = 147.92 MeV

The binding energy per nucleon of ¹⁹F can be calculated as:

B.E.N. = 147.92/18.9984 = 7.786 MeV per nucleon

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Answer:

This is not chemistry this is physics

The molecular formula for sodium nitrate is NaNO₃, and the molecular formula for potassium acetate is KCH₃COO.

Complete ionic equation:

Na⁺(aq) + NO₃⁻(aq) + K⁺(aq) + CH₃COO⁻(aq) → Na⁺(aq) + CH₃COO⁻(aq) + K⁺(aq) + NO₃⁻(aq)

Net ionic equation:

NO₃⁻(aq) + CH₃COO⁻(aq) → no reaction

The net ionic equation shows that there is no reaction between sodium nitrate and potassium acetate. When these compounds are mixed, they will dissociate into their respective ions in solution, but these ions do not react with each other to form any new compounds or products. Therefore, the net ionic equation is simply the two ions that remain in solution after dissociation.

When sodium nitrate (NaNO₃) and potassium acetate (KCH₃COO) are mixed in water, they dissociate into their respective ions due to the polar nature of water molecules.

The net ionic equation shows only the species that are involved in the actual reaction, which in this case is no reaction. We can see that the NO₃⁻ and CH₃COO⁻ ions are both present on both sides of the equation, meaning that they do not react with each other. Therefore, there is no change in the identity of the species present in solution, and no new compounds are formed.

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Answer:

A. pressure and C. wavelength

Explanation:

All sound is different and many are affected differently but pressure and wavelength of it are the main ones.