A conducting sphere has a net charge of –6. 4 × 10–17 c. What is the approximate number of excess electrons on the sphere?.

The statements which are true about heterogeneous mixtures are they settle out, they exhibit the tyndall effect and they exhibit brownian motion.

Heterogeneous mixtures are those mixtures in which composition of their constituent partiles are not identical or even, they may vary place to place.

Hence, options (1), (2) & (4) are correct.

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Answer:

A,B,D

Explanation:

i got it right

Answer:

Explanation:

The closest I can come to this is

Li C2H5 which would really be weird, but it comes to nearly 37.11. Everything depends on the periodic table you are using.

C2 = 2 * 12.011 = 24.022

H5 = 5 *   1.008 = 5.040

Li =  1 * 6.94          6.94

Total                    36.002  

Answer:

2 hydrogen atoms

Explanation:

The arrangement and mobility of molecules in a fluid state, controlled by intermolecular interactions, are included in the molecular structure of a liquid.

A liquid is made up of a group of particles, usually molecules, that are constantly moving and display intermolecular forces of attraction. These intermolecular forces, including hydrogen bonds, dipole-dipole interactions, and van der Waals forces, are very important in influencing the behavior and characteristics of the liquid.

Although the molecules in a liquid are closely packed, they are not organized in a predictable way like they are in a solid. Instead, they are sufficiently energetic to move past one another, giving rise to a nature that is fluid and shape-adaptive. This property enables liquids to adopt the shape of the container they are contained in.

A liquid's molecular structure is dynamic and always in motion. Although individual molecules are free to move, intermolecular forces they encounter have an impact on how they behave. Depending on the sort of molecules present and their functional groups, these forces' potency and nature can change.

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The initial temperature of the water and copper is 22.51°C.

Mass of ice m = 14 g

We know, 1g = 0.001 kg

So, m= (14 x 0.001)kg = 0.014kg

Mass of water ml = 300g = (300 x 0.001)kg = 0.3kg

Mass of copper calorimeter m₂ = 200g = (200 × 0.001) kg = 0.21 kg

Specific heat of water s₁ = 4186 \(\frac{J}{kg . C}\)

Specific heat of ice s₂ = 2100 \(\frac{J}{kg.C}\)

Specific heat of copper s₃ = 387 \(\frac{J}{kg.C}\)

Latent heat of fusion of water L = 3.33 x 10⁵ \(\frac{J}{kg}\)

Initial temperature of ice T₁ = - 10°C

Initial temperature of water copper is T₂

Final temperature of the system is T = 18 °C

From equilibrium in heat

Heat gain by ice to become 0°C of ice +0°C of ice become 0 °C of water + 0°C of water become 18°C of water = heat loss by copper and water

 ms₂ (0°-(-10°)) + mL + ms₁ (T -0°) = m₁s₁ (T₂-18°) + m₂s₃ (T2 - 18°)

∴ 0.014 × 2100 × 10 + 0.014 × 3.33 × 10⁵+ 0.014 × 4186 × 18 = 0.3 × 4186 × (T₂- 18 ) + 0.2 × 387 × ( T₂ -18 )

∴ 6010.87 = 1333.2(T₂ - 18)

∴ T₂ - 18 = 6010.87 / 1333.2 = 4.51

∴ T₂ = ( 18 + 4.51 )

∴ T₂ = 22.51° C

So, the initial temperature of the water and copper is 22.51°C.

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Answer:

In terms of heat transfer,radiation is the emission of thermal energy in the form of infrared waves,

Answer:

it's bright where you can see it it's not that bright compared to the sun from Earth it's really not so bright

The pH of the buffer solution after the addition of 0.020 mol of HCl is approximately 7.779.

A buffering agent is a substance that can withstand tiny additions of bases or acids without changing its pH. A weak acid with its conjugate base, and a base that is weak and its conjugate acid, make up the compound.

Small amounts of additional acid or base can be neutralised by the weakened acid or base while significantly altering the acidity of the solution in question. This is due to the fact that the acid that is weak and the base it conjugates with (or a base that is weak and its conjugated acid) exist in the solution in nearly equal proportions and can engage in a reversible process that preserves the pH..

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The ranking of bonds by increasing price volatility (duration) is as follows:

2) 4,2,1,3

This means that option 2 ranks the bonds in the correct order of increasing price volatility.

The duration of a bond measures its sensitivity to changes in interest rates. Generally, bonds with longer durations are more sensitive to interest rate changes and exhibit greater price volatility.

In the given ranking, the bond with the lowest price volatility (shortest duration) is bond 4, followed by bond 2, bond 1, and bond 3. This implies that bond 4 is the least affected by interest rate changes and has the lowest price volatility, while bond 3 is the most sensitive to interest rate changes and has the highest price volatility.

The ranking is based on the understanding that longer-term bonds tend to have higher durations and are more susceptible to price fluctuations due to changes in interest rates, while shorter-term bonds have lower durations and exhibit lower price volatility.

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Answer:

1. The pattern of a tiger's stripes

Explanation:

DNA is the code within a living organism that tells how it will look and how it will behave structurally. The only one of these choices that fits that is 1.

DNA helps in determining pattern of tiger's stripes.As DNA gives qualitative relationship about inherited characteristics and tiger's stripes.  Thus,option A is correct.

It is a polymer made of two polynucleotide chains coiled around together giving DNA a helical structure.  It carries all genetic information  and is responsible for growth ,functioning and reproduction.

Both strand of DNA store same biological information .Information is replicated when the two strands begin to separate.A large part of DNA is non-coding meaning they do not serve as protein sequences.

DNA is organized into chromosomes which are large structures. These chromosomes are duplicated in the process of DNA duplication.The human genome comprises of 3 billion base pairs  of DNA which are arranged to give rise to 46 chromosomes.

Therefore,DNA determines pattern of tiger's stripes.

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Answer:

A, And D

Explanation:

I did this before and i got it right ❤

According to the chemical formula given, Zink + 2MnO2 + H2O Zn(OH)2 + Mn2O3, 220.7 grams of MnO2 are required to produce 126.0 grammes of Zn(OH)2.

The following chemical equation states that 15.0 grams of MnO2 Mn O 2 and 30.0 grams of HCl H C l can be combined to produce 12.26 grams of Cl2 C l 2.

We must first determine the amount of moles of Zn(OH)2:

126.0 g Zn(OH)₂ ÷ 99.43 g/mol Zn(OH)₂ = 1.267 mol Zn(OH)₂

The stoichiometry of the equation states that 2 moles of MnO2 are required to make 1 mole of Zn(OH)2.

As a result, the needed quantity of MnO2 is:

1.267 mol Zn(OH)₂ × 2 mol MnO₂ / 1 mol Zn(OH)₂ = 2.534 mol MnO₂

Using its molar mass, we can finally get the mass of MnO2 required:

2.534 mol MnO₂ × 86.94 g/mol MnO₂ = 220.7 g MnO₂

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The altitude is a crucial component of the 3D view since it enables a better understanding of the terrain. In a pseudo-3D view, an image is displayed with the perception of 3D, although it is not a genuine 3D image.

The view from the pseudo-3D angle, however, allows viewers to understand the mountains, cliffs, and other terrain features in a more realistic way. The image is formed by utilizing an aerial image and enhancing it with a 3D effect. As a result, the image has more depth and detail than a conventional overhead image.The altitude is another crucial component that aids in the display of the terrain features of Zion. The higher the altitude, the more information is provided. For example, the 3D map of Zion taken from a height of 30,000 feet can reveal the geography of the land, the valleys, and the different kinds of vegetation.

The same view, when taken from a higher altitude, such as a satellite, provides a more comprehensive perspective of the land.

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There is, however, a relationship between a planet's distance from the Sun and its period of revolution. Kepler's third law of planetary motion says that the square of the planet's orbital period is proportional to the cube of its semimajor axis.

According to Kepler's third law of planetary motion, a planet's semimajor axis and orbital period are inversely proportional.

Kepler's third law is defined as the cubes of the semi-major axes of the planets' orbits are directly proportional to the squares of the planets' orbital periods. According to Kepler's Third Law, as an orbiting planet's radius increases, so does the time of its orbit around the Sun. A planet's orbits around the sun are accurately described by Kepler's third law in terms of their period and distance.

The cube (third power) of an orbital radius is directly related to the square (second power) of a planet's period (P2 = R3). The period of revolution shortens as the planet's distance from the sun rises.

Thus, according to Kepler's third law of planetary motion, a planet's semimajor axis and orbital period are inversely proportional.

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Answer:

Explanation:

The main difference between these two processes is that fission is the splitting of an atom into two or more smaller ones while fusion is the fusing of two or more smaller atoms into a larger one.

Fission means splitting 1 atom into more atom

Fusion means Combination of 2 atom or more atom.

Answer: You have the values of P1, V1, T1, T2, and V2.  Plug in the numbers and get P2.

Explanation:

Work with the relation

P1V1 / T1 = P2V2 / T2 ⇒

P2 = (P1V1 / T1) (T2 / V2)

Oxygen is an element, symbol O

Magnesium oxide is an ionic compound, formula MgO

An oven mitt protects your hand by providing insulation and increasing the time it takes for heat to transfer to your hand.

When you pick up something hot with an oven mitt, the oven mitt acts as a barrier between your hand and the hot object. It is made of materials with low thermal conductivity, which reduce the transfer of heat. The oven mitt also creates a layer of air between your hand and the hot object, further slowing down the heat transfer process. This insulation and increased time for heat transfer help protect your hand from the high temperatures, reducing the risk of burns or discomfort. Regarding the difference in specific heat capacity, it is not directly related to how an oven mitt protects your hand. Specific heat capacity is the amount of heat energy required to raise the temperature of a substance by a certain amount. While it plays a role in determining the amount of heat absorbed or released by a material, it does not directly impact the protective function of an oven mitt. Overall, the insulation and increased time for heat transfer provided by an oven mitt help to protect your hand from the high temperatures of the hot object, reducing the risk of burns or discomfort.

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After adding sodium bicarbonate (NaHCO₃) to a mixture, you can observe the separation of the layers based on their variations in density and solubility to ascertain which layer is the aqueous layer.

NaHCO₃ is water-soluble, so when it is added to a mixture, it will dissolve in the aqueous layer, if present. The organic layer, on the other hand, typically consists of organic solvents that are immiscible with water.

Here's a general procedure to determine the aqueous layer:

1. After adding NaHCO₃ to the mixture, gently shake or swirl the mixture to allow for thorough mixing.

2. Allow the mixture to sit undisturbed for a short period to allow phase separation to occur. The layers will separate based on their densities, with the denser layer settling at the bottom.

3. Observe the separation of the layers. The layer that appears at the bottom is likely the aqueous layer containing the dissolved NaHCO₃.

4. Carefully transfer the bottom layer (aqueous layer) to a separate container using a suitable separation technique such as pipetting or pouring.

5. The remaining layer, usually on top, is the organic layer, which can be collected separately if needed.

It's important to note that the specific characteristics of the mixture and the solvents used will influence the separation process. Adjustments may be required based on the particular experimental setup and the properties of the compounds involved.

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The answer is D) The solution has a greater buffer capacity for the addition of acid than for base, because [NH3]>[NH4+]. This is because the spilled NH4Cl(s) would have resulted in a lower concentration of NH4+ ions in the solution, which means there would be fewer conjugate acid molecules available to neutralize added base.

The other hand, the concentration of NH3 would remain the same, which means there would be plenty of conjugate base molecules available to neutralize added acid. Therefore, the buffer capacity for the addition of acid would be greater than for the addition of base. To determine the effect of the spill on the buffer capacity, we first need to calculate the concentrations of NH3 and NH4+ in the solution after the spill. 1. Calculate the moles of NH4Cl added to the solution 50 g NH4Cl / 53.49 g/mol = 0.935 moles NH4Cl 2. Calculate the concentration of NH4+
0.935 moles NH4Cl / 1.0 L solution = 0.935 M NH4 3. Calculate the concentration of NH3 Since 1.0 L of 1.0 M NH3 was added, there are initially 1.0 moles of NH3 in the solution. 4. Compare the concentrations of NH3 and NH4+ [NH3] = 1.0 M [NH4+] = 0.935 M Since [NH3] > [NH4+], the solution has a greater buffer capacity for the addition of acid than for base. Therefore, the correct answer is D) The solution has a greater buffer capacity for the addition of acid than for base, because [NH3] > [NH4+].

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Answer:

C.  There would be more places for new species to enter the ecosystem.

Explanation:

The Shipwrecks established artificial reefs that address the problem of a natural reef.

The artificial reefs provide a stable growing area for corals, and habitat for fishes and new organisms along with food sources that is found in natural reefs. This helps to increase the growth of marine life.

Hence, the correct answer is "C.  There would be more places for new species to enter the ecosystem."

An isotope undergoing radioactive decay by emitting radiation that has a -1 charge is most likely an electron, which is commonly known as a beta particle. Beta particles have a negative charge and are emitted by the nucleus during beta decay.

Here, correct option is A.

Beta particles have a small mass compared to other types of particles, such as alpha particles and neutrons, but they do have mass. Therefore, option (b) "no mass" is incorrect.

Beta particles have a moderate penetrating power and can be stopped by a few millimeters of aluminum or a few centimeters of wood or other materials. Therefore, option (d) "high penetrating power" is also incorrect.

Thus, the correct answer to this question is option (a) "some shielding required," which means that some amount of material is required to shield against the beta radiation. Beta particles can penetrate some distance into materials, but they can be stopped by a layer of material of sufficient thickness.

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Answer:

Common pollutants produced by engines that burn fossil fuels are carbon dioxide, nitrogen oxides, sulfur dioxide, volatile organic compounds (VOCs), and particulates. Stoves, incinerators, and open burning produce carbon monoxide and carbon dioxide, as well as particulates.

Explanation:

Answer:the answer is c , location Y

The location at which the marble have maximum kinetic energy is location Y.

Conservation of energy states that total energy of the system doen not change else the one form of energy is converted into another form within the system.

In the given diagram it is mention that potential energy of marble is highest at the location W as potential energy is directly proportional to the height. But when the marble rolls down it attains the kinetic energy and potential energy decreases.

According to the law of conservation at point Y potential energy is minimum, so that kinetic energy becomes maximum at this point.

Hence at location Y marble have maximum kinetic energy.

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Answer

1.0 mol

Explanation

Given:

Volume, V = 5.0 L

Temperature, T = 215 K

Pressure, P = 342 kPa

The gas constant, R = 8.31 L kPa/mol K

What to find:

The number of moles of the gas sample.

Step-step-solution:

The number of moles of the gas can be determine using the ideal gas equation formula:

Put the given values into the formula and calculate for n:

The number of moles of the gas sample is 1.0 mol.

The change is 84.698 J/K

To find the change in entropy (∆S) for an ideal gas undergoing free expansion, you can use the formula:

∆S = n * R * ln(V2/V1)

where n is the number of moles (7.00 moles), R is the universal gas constant (8.314 J/(mol·K)), V1 is the initial volume (25 cm³), and V2 is the final volume (100 cm³).

First, convert the volumes to m³:
V1 = 25 cm³ * (1 m³ / 1,000,000 cm³) = 2.5 x 10^(-5) m³
V2 = 100 cm³ * (1 m³ / 1,000,000 cm³) = 1 x 10^(-4) m³

Now, substitute the values into the formula:
∆S = 7.00 * 8.314 * ln(1 x 10^(-4) m³ / 2.5 x 10^(-5) m³)
∆S = 7.00 * 8.314 * ln(4)
∆S ≈ 84.698 J/K

The change in entropy is approximately 84.698 J/K.

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Answer:

\(\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}\)

Answer:

D: Lithium

Explanation:

Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer tot he nuclei and harder to remove.

Answer:

c.

Explanation: