a graduated cylinder is filled to the 40.00 ml mark with mineral oil. The masses of the cylinder before and after the addition of mineral oil are 124.966g and 159.446g. In the seperate experiment, a metal ball bearing of mass 18.713g is placed in the cylinder and the cylinder is again filled to the 40.00ml mark with the mineral oil. The combined mass of the ball bearing and mineral oil is 50.952g. calculate the density of the ball bearing

Answer:

The initial temperature of the water is -75.08 K.

Explanation:

Given that,

Mass of water, m = 27 g

Heat absorbed, Q = 1,5000 J

Final temperature of water, T₂ = 57.7 K

The specific heat of water is 4.184 J/​g-K

We know that,

\(Q=mc\Delta T\\\\Q=mc(T_2-T_1)\\\\\dfrac{Q}{mc}=(T_2-T_1)\\\\T_1=T_2-\dfrac{Q}{mc}\)

Put all the values,

\(T_1=57.7-\dfrac{15000}{27\times 4.184 }\\\\=-75.08\ K\)

So, the initial temperature of the water is -75.08 K.

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer: Brainlest Please!

Explanation:

According to the kinetic model of gases, the molecules of a gas are in constant random motion, colliding with each other and with the walls of the container. The pressure of the gas is caused by the force exerted by the molecules as they collide with the walls of the container.

If the volume of the gas is decreased while the temperature is held constant, the molecules will have less space to move around, and their average distance between collisions will decrease. This means that the frequency of collisions with the walls of the container will increase as the volume of the gas is decreased.

To see why this happens, consider that the pressure of a gas is proportional to the number of collisions per unit time and unit area of the container wall. If the volume of the container is reduced, the number of collisions per unit area will increase because there are fewer molecules in a smaller space, and they will collide with the wall more frequently. Thus, the pressure of the gas will increase as the volume is decreased at constant temperature.

Therefore, as the volume of the gas is decreased at constant temperature, the frequency of collisions of the molecules with the walls of the container increases, leading to an increase in pressure.

For a student wishing to contribute to the preservation of coral reefs, oceanography would be the most beneficial topic of study because it is ocean-focused.

An underwater environment known as a coral reef is characterized by corals that construct reefs. Coral polyp colonies are bound together by calcium carbonate to build reefs. Stony corals, whose polyps gather together, make up the majority of coral reefs.

Coral reefs offer chances for recreation, serve as a barrier against erosion and storm damage, and support local economies. They are also a source of fresh medications and food. More than 500 million people rely on reefs for safety, income, and food.

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Answer:

11.9g remains after 48.2 days

Explanation:

All isotope decay follows the equation:

ln [A] = -kt + ln [A]₀

Where [A] is actual amount of the isotope after time t, k is decay constant and [A]₀ the initial amount of the isotope

We can find k from half-life as follows:

k = ln 2 / Half-Life

k = ln2 / 27.7 days

k = 0.025 days⁻¹

t = 48.2 days

[A]  = ?

[A]₀ = 39.7mg

ln [A] = -0.025 days⁻¹*48.2 days + ln [39.7mg]

ln[A] = 2.476

[A] = 11.9g remains after 48.2 days

Answer:

C.

Explanation:

Answer:

The Relationship between Pressure and Volume: Boyle's Law

As the pressure on a gas increases, the volume of the gas decreases because the gas particles are forced closer together. Conversely, as the pressure on a gas decreases, the gas volume increases because the gas particles can now move farther apart

Air escape from a tire when tire valve is opened because the pressure from the weight of the car is forcing the already pressurized air out .

When air is filled in tires, it get into more compact area than the outer atmosphere, therefore particles in tire are close to each other and exert pressure continuously on tire walls to get out of it. Thus, material of the tire need to be pressure resistant as much possible.

After opening the tire valve, air starts leaving with huge sound as strain outside the tire is weaker than that inside the tire. Molecules strike with the same force on larger area and pressure starts diminishing.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Air leaves a tire when the tire valve is opened because

A. the pressure outside the tire is lower than the pressure inside the tire.

B. the pressure outside the tire is greater than the pressure inside the tire.

C. the temperature is higher outside the tire than inside the tire.

D. there are more gas particles outside the tire than inside the tire.

Answer:

1.75 moles

Explanation:

According to CaC₂(s) + 2 H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

2 moles of H20 will produce 1 mole of Ca(OH)2

therefore 3.5 moles of H2O will produce 3.5 x (1/2) = 1.75 moles of Ca(OH)2

Answer: Positive ions or cations

Explanation:

The ions are formed when an atom gains or lose electrons.

The ions are classified into two which are called the cations and anions. The cation is classified as the positive charge formed by the loss of electrons. Example: \(Na^+\) is formed by the loss of one electron by \(Na\)

The anion is classified as the negative charge ion formed by the gain of electrons. Example : \(F^-\) is formed the gain of one electron by \(F\)

Thus when an element loses electrons, it forms positive ions or cations.

Ammonium sulfate fertilizer is more expensive than sodium nitrate fertilizer in most cases.

As a fertilizer, sodium nitrate is more cost-effective than fertilizer that contains ammonium sulfate due to its higher nitrogen content. Because sodium nitrate contains a higher percentage of nitrogen, it meets the plant's need for fertilizer while requiring less fertilizer to be applied.

You can determine the proportion of nitrogen in ammonium sulfate by dividing the molar masses of the two nitrogen atoms by the molar masses of the compound and then multiplying the result by 100. This indicates that every 100 grams of ammonium sulfate contains 21.2 grams of nitrogen.

To determine the generator and power station's percentage efficiency, divide the 3,412 Btu equivalent of a kWh of energy by the heat rate. For instance, at a heat output of 10,500 Btu, the efficiency is 33%.

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Answer:

It depends on the context of the measurement.

2.0 mg is a very small amount of weight, equivalent to 0.002 grams.

0.015 g is also a small amount of weight, equivalent to 15 mg.

2.0 mg multiplied by 0.015 g would yield a result of 0.00003 g or 0.03 mg, which is a very small quantity.

It is possible to measure this quantity, but it may require very precise equipment and measurement techniques depending on the context.

It is important to note that, Mathematically the question doesn't make sense because the units are not compatible and the result would be non-sensical

Answer:

Explanation:

3.0 × 10-^11 kg^2

Answer:

joe.......

Explanation:

mama......

Answer:

m = 200.6 gr

Explanation:

CH2COOH : n = 3.4 mol

Mr = 12 + 2 + 12 + 2×16 + 1 = 59

n= m / Mr => m = n× Mr => m = 3.4×59 => m = 200.6 gr

The centrifuge is an instrument which is mainly used in research and clinical laboratories. All the given equipment are used in laboratories. But Centrifuge is not a common piece of lab equipment. The correct option is B.

The laboratory equipment is mainly used to perform experiments and to take measurements and to collect data. The most common laboratory equipment includes Bunsen burners, burettes, pipette, microscope, calorimeters, etc.

A centrifuge is a system which is used to separate the components of a liquid using centrifugal force. It is not a common laboratory equipment.

Thus the correct option is B.

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Answer:

Polarity is caused by the difference in electronegativity (EN) of a compound. For example, water, H2O, is polar because oxygen's EN is much higher than hydrogens. Therefore, the electrons spend more time around the oxygen and less time around the hydrogen causing a slightly positive pole at the hydrogens and a slightly negative at the oxygen. Most polar molecules are not symmetrical (like water). Non-polar molecules like CH4 (methane) do not have poles.

Hope that helps

Answer:

NA

Explanation:

Answer:

Disrupts communication systems

Composed of charged particles

travels at about 400 km/s

Answer:

BCD

Explanation:

Answer:

Explanation:Because of the delocalised electrons exposed above and below the plane of the rest of the molecule, benzene is obviously going to be highly attractive to electrophiles - species which seek after electron rich areas in other molecules.

Answer:

Benzene has a pi electron system that is electron rich.

Electrophiles are molecules that are attracted to electron rich molecules as they are electron deficient in order to form a more stable complex.

Hence, as benzene is electron rich, electrophiles will be attracted to it.

In the redox reaction involving the permanganate ion in acidic solution, permanganate ion is reduced to manganese (ii) ion while iron (ii) ion is oxidized to iron(iii) ion.

A redox reaction is a reaction in which reduction and oxidation occurs at the same time and to the same extent.

An example of a redox reaction is the reaction involving the permanganate ion and tetraoxosulphate (vi) ion in acidic solution.

The equation of the reaction is given below:

\(MnO_{4}^{ - } (aq) + 5Fe^{2+}(aq) + 8H^{+} \rightarrow Mn^{2+}(aq)+ 5Fe^{3+}(aq) +4H_{2}O(l) \\ \)

Therefore, in the redox reaction involving the permanganate ion in acidic solution, permanganate ion is reduced to manganese (ii) ion while iron (ii) ion is oxidized to iron(iii) ion.

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The frequency of gamma radiation is calculated to be = 1.11 *10^20 Hz.

A gamma radiation is also known as gamma ray. It is a penetrating form of electromagnetic radiation arising from radioactive decay of atomic nuclei. It consists of shortest wavelength electromagnetic waves, even shorter than X-rays.

Gamma rays can pass through the human body completely and as they pass through, they cause ionizations that damage tissue and DNA.

As we know that E= hf

Hence, f= E/h

Given E=  6.96 x 10-14 J

And, Planck's constant, h = 6.626 *10^-34 m² kg/s

f = 6.96 * 10^-14J  +/6.626 *10^-34

f = 1.11 *10^20 Hz

Hence, frequency of gamma radiation = 1.11 *10^20 Hz.

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The equilibrium expression can be written as follows:

K = [CaCO₃] × [H₂]⁴

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

[CaO] × [CH₄] × [H₂O]²

In this equilibrium expression, the square brackets represent the concentrations of the species involved in the reaction, and the coefficients of the balanced equation indicate the stoichiometric coefficients of the corresponding species.

The concentration of a pure solid (CaCO₃ in this case) is not included in the equilibrium expression, as it remains constant throughout the reaction.

The equilibrium constant (K) represents the ratio of the product concentrations to the reactant concentrations at equilibrium, each raised to the power of their respective stoichiometric coefficients. The specific values of these concentrations depend on the initial conditions, and K remains constant as long as the temperature is unchanged.

It is important to note that the equilibrium constant expression is written based on the balanced chemical equation. The stoichiometric coefficients determine the relationship between the concentrations of reactants and products, allowing us to express the equilibrium state quantitatively using the equilibrium expression.

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When temperature increases ΔG of the reaction gets more negative and more spontaneous.

Gibbs free energy is usually denoted as G which combines enthalpy and entropy into a single value. The change in free energy, ΔG, is defined as the sum of the enthalpy plus the product of the temperature and entropy of the system.

ΔG = - RT log Keq

When ammonium chloride dissolves in water its solubility increases with temperature because the dissolution process is endothermic in nature and that's why on increasing temperature the equilibrium shifted towards forward direction to increase the solubility.

ΔG = ΔH - TΔS, Also for exothermic process, ΔH = +ve

The solubility graph of ammonium chloride is given below in the image attached.

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The mass of hydrogen needed to produce 51.0 grams of ammonia is  ≈ 9.07 grams.

To determine the mass of hydrogen required to produce 51.0 grams of ammonia (NH3) using the Haber process, we need to calculate the stoichiometric ratio between hydrogen and ammonia.

From the balanced chemical equation:

3 H₂(g) + N₂(g) → 2 NH₃(g)

We can see that for every 3 moles of hydrogen (H₂), we obtain 2 moles of ammonia (NH₃).

First, we need to convert the given mass of ammonia (51.0 grams) to moles. The molar mass of NH₃ is 17.03 g/mol.

Number of moles of NH₃ = Mass / Molar mass

                     = 51.0 g / 17.03 g/mol

                     ≈ 2.995 moles

Next, using the stoichiometric ratio, we can calculate the moles of hydrogen required.

Moles of H₂ = (Moles of NH₃ × Coefficient of H₂) / Coefficient of NH₃

           = (2.995 moles × 3) / 2

           ≈ 4.493 moles

Finally, we can convert the moles of hydrogen to mass using the molar mass of hydrogen (2.02 g/mol).

Mass of H₂ = Moles × Molar mass

          = 4.493 moles × 2.02 g/mol

          ≈ 9.07 grams

Therefore, approximately 9.07 grams of hydrogen is needed to produce 51.0 grams of ammonia in the Haber process.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass of pencil = 3.5 g

density = 0.875 g/mL

So we have

\(volume = \frac{3.5}{0.875} \\ \)

We have the final answer as

Hope this helps you