Is PH3 polar or nonpolar

Answer is D & C

Explanation:

It is not just C or D you need to select TWO options.

Speed and direction, Displacement and time can be used to determine the velocity of an object.

Velocity is the rate of change in the position of the object with respect to time, it is basically speeding the object in a specific direction.

Velocity is a  vector quantity, which shows both magnitude  and direction  where The SI unit is meter per second (ms-1).

the change in  magnitude or the direction of velocity of a body, can lead to acceleration.

The final velocity can be calculated as the simple but few calculations and basic conceptual knowledge are needed.

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An isochron represents the age of a rock, given the composition of minerals. In geochronology, isochron dating is a technique used to determine the age of rocks or geological samples.

Isochron dating relies on analyzing the ratios of isotopes within the minerals present in the rock. Isotopes are variants of an element with different numbers of neutrons in their atomic nuclei. By measuring the isotopic ratios, specifically the parent and daughter isotopes, scientists can calculate the time elapsed since certain geological events, such as the crystallization of the rock or a metamorphic event.

The isochron method involves plotting the isotopic ratios on a graph, typically using a set of minerals from the same rock sample. If the minerals formed at the same time, the data points will fall along a straight line known as an isochron. The slope of the isochron line provides the age of the rock, while the intercept with the y-axis indicates the initial isotopic composition. This technique helps to overcome challenges such as the presence of inherited isotopes or disturbances in the isotopic system, providing a reliable estimate of the rock's age.

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To determine the statistical analysis is a difference between the groups we have to Calculate the number of participants who preferred each soda

Experiment design for studying soda preference A well-designed experiment typically involves identifying a problem, designing a study that will yield data to answer the research question, and collecting and analyzing data.

In this case, you would like to conduct an experiment in class to see if your classmates prefer the taste of regular coke or diet coke. The following is an experiment design for this study.

Step 1: Develop a research question and hypothesis. The research question in this study is “Which soda do my classmates prefer, regular coke or diet coke?”The hypothesis of this study is that more students will prefer regular coke to diet coke.

Step 2: Select a sample of participants. A sample of participants should be chosen for the study. The sample should be large enough to provide sufficient data but small enough to be manageable. In this case, you could select a sample of 50 participants.

Step 3: Divide participants into two groups. Divide the participants randomly into two groups, with each group containing an equal number of participants. One group will be given regular coke, while the other group will be given diet coke.

Step 4: Ask participants to taste their assigned soda. Once the participants are divided into groups, give each participant a cup of the soda they have been assigned to taste. Be sure that each participant does not know which soda they are tasting to avoid any bias.

Step 5: Collect data. After the participants have tasted their assigned soda, ask them which one they preferred. Record their answers and tally the results.

Step 6: Analyze the data. Calculate the number of participants who preferred each soda. Use statistical analysis to determine whether there is a statistically significant difference between the groups.

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Answer:

Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.

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(i) The initial-boundary value problem for the given scenarios are as follows:

a) Scenario a:

PDE: ∂u/∂t = k * ∂²u/∂x²

Initial condition: u(x, 0) = 100 (boiling water temperature)

Boundary conditions: u(0, t) = 10, u(L, t) = 10 (constant temperature at the ends)

b) Scenario b:

PDE: ∂u/∂t = k * ∂²u/∂x²

Initial condition: u(x, 0) = 100 (boiling water temperature)

Boundary conditions: u(0, t) = 0 (temperature at x=0), ∂u/∂x(L, t) = 0 (thermal insulation at x=L)

(iii) The solution for the temperature distribution as time approaches infinity can be found by solving the appropriate steady state equation.

(i) The initial-boundary value problem formulation states the partial differential equation (PDE) governing the temperature distribution in the aluminum bar, along with the initial condition and boundary conditions.

In scenario (a), both ends of the bar are immersed in a medium with a constant temperature of 10 degrees Celsius, while in scenario (b), the end at x=0 is immersed in a medium with temperature 0 degrees Celsius and the end at x=L is insulated.

(ii) As time approaches infinity, the temperature distribution in the bar tends to reach a steady state.

In scenario (a), the temperature throughout the bar will eventually approach a constant value of 10 degrees Celsius, since both ends are immersed in a medium with that temperature.

In scenario (b), the temperature at x=0 will approach 0 degrees Celsius, while the temperature at x=L will remain constant due to thermal insulation.

(iii) To find the solution as time approaches infinity, we need to solve the appropriate steady state equation.

In scenario (a), the steady state equation is ∂²u/∂x² = 0, which implies that the temperature gradient is zero throughout the bar, resulting in a constant temperature of 10 degrees Celsius.

In scenario (b), the steady state equation is ∂²u/∂x² = 0 with the boundary condition u(0) = 0, which implies a linear temperature distribution from 0 degrees Celsius at x=0 to a constant temperature at x=L due to insulation.

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Answer:

A. 7

(assuming the water is neutral)

Answer:

See explanation

Explanation:

Ammonia is a covalent molecule. We should remember that a covalent molecule is formed by the sharing of electrons.

Now hydrogen has only one valence electron while nitrogen has five valence electrons. Two among these five valence electrons is a lone pair of electrons.

Three hydrogen atoms can share one electron each with all of the available valence electrons in nitrogen to form NH3 with the lone pair of electrons still localized on the nitrogen atom.

The correct statement about the buddy system for allocating memory is:

C. With the buddy system, memory segments can be either divided or coalesced to satisfy an allocation request.

The buddy system is a memory allocation technique used in operating systems. It divides memory into fixed-size blocks or segments, typically in powers of two. When a memory allocation request is made, the system looks for a free block of suitable size. If the block is larger than required, it can be divided or split into smaller blocks to satisfy the request. Conversely, if adjacent blocks are free, they can be coalesced or merged to form a larger block for allocation.

A. The buddy system is not specifically designed for quickly allocating pages on demand for user-space applications. It is a general memory allocation strategy used in various contexts.

B. The buddy system may still result in internal fragmentation. Internal fragmentation occurs when allocated memory blocks are slightly larger than the requested size, leaving unused space within the block.

D. The buddy system does not guarantee physically contiguous memory allocation. It can allocate memory from different available blocks, which may or may not be physically contiguous.

Therefore, the only true statement is C. With the buddy system, memory segments can be either divided or coalesced to satisfy an allocation request.

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For the sample of n sludge specimens is selected and the conclusion and the pH of each one is determined.

A) The null hypothesis is rejected. Sufficient evidence is present for the fact that the true average pH is less than 7.0.

B) The null hypothesis is rejected. Sufficient evidence is present for the fact that the true average pH is less than 7.0.

C) The null hypothesis is rejected. Sufficient evidence is present for the fact that the true average pH is less than 7.0.

D) The null hypothesis is rejected. Sufficient evidence is present for the fact that the true average pH is less than 7.0.

E) The null hypothesis is rejected. Sufficient evidence is present for the fact that the true average pH is less than 7.0.

The null hypothesis in inferential statistics is that two possibilities are always equal. It shows that the underlying assumption is that the observed difference is just the result of chance. It is possible to estimate the probability of the null hypothesis is correct using statistical tests.

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Answer:

the last one is the answer

Answer:

Higher temperatures means more energy, and a solid phase means the particles are close together. This results in highly energized particles that bump into the particles close to them, who in turn bump into more particles.

Explanation:

waves move faster at higher temperatures and in a solid phase there is more energy and the particles are farther apart there is less energy and the particles are closer together there is less energy and the particles are farther apart there is more energy and the particles are closer together.

The waves move faster at higher temperatures and in a solid phase because there is more energy and the particles are closer together.

A wave can be described as a medium which transports energy without causing net particle movement. Elastic deformation, pressure change, electric along with magnetic intensity, electric potential, or temperature can all be examples.

The quantitative property that's also transferred to a body or a physical system, recognizable in the work performance as well as in the form of heat and light, is called energy.

Temperature is the measurement of a body's degree of hotness or coolness.

The faster the wave is conveyed, the greater the particle interactions are. In general, sound travels quicker through solids than through liquids, and faster through liquids than through gas. Because warmer particles move at a higher pace, the temperature actually speeds up to sound.

Therefore, the correct answer will be option (d).

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Answer:

The volume of hydrogen gas produced at s.t.p. is 9.419 dm³

Explanation:

The balanced chemical equation for the reaction is given as follows;

Zn + 2HCl → ZnCl₂ + H₂

Therefore, we have;

One mole of Zn reacts with 2 moles of HCl to produce one mole of ZnCl₂ and one mole of H₂

Number of moles of Zn present = 25/65 = 5/13 = 0.385 moles

Therefore, number of moles of H₂ produced = 0.385 moles

The volume of hydrogen gas produced is given by the relation

PV = nRT, we have;

R = 8.3145 J/(mol·K)

V = nRT/P = 0.385 ×8.3145 ×298.15/(101325)= 0.009419 m³ = 9.419 dm³

The volume of hydrogen gas produced at s.t.p. = 9.419 dm³.

Answer:

Yes ionic bonds do dissolve in water

Explanation:

Water is a polar solvent and has two poles one negative and another positive. The two poles of water have strong forces of attraction towards other charged ions, due to this water breaks the ionic bond by hydrogen bond formation. Therefore, ionic bonds dissolve in water.

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544.5 g of sulfuric acid can be produced from 200 g of SO₃ and 100 g of H₂O.

The balanced equation for the reaction between sulfur trioxide (SO₃) and water (H₂O) to produce sulfuric acid (H₂SO₄) is:

SO₃ + H₂O → H₂SO₄

To determine how many grams of sulfuric acid can be produced from 200 g of SO₃ and 100 g of H₂O, we need to use stoichiometry.

First, we need to find the limiting reactant, which is the reactant that will be completely consumed first, thereby limiting the amount of product that can be formed. We can determine the limiting reactant by calculating the number of moles of each reactant and comparing them based on their stoichiometric coefficients in the balanced equation.

Moles of SO₃ = 200 g / 80.06 g/mol = 2.499 mol

Moles of H₂O = 100 g / 18.02 g/mol = 5.548 mol

Based on the balanced equation, the stoichiometric ratio of SO₃ to H₂O is 1:1. Therefore, H₂O is the limiting reactant since we have more moles of H₂O than SO₃.

The amount of sulfuric acid that can be produced is limited by the amount of H₂O, which is 5.548 moles. According to the balanced equation, each mole of H₂O reacts with one mole of SO₃ to produce one mole of H₂SO₄. Therefore, the number of moles of H₂SO₄ that can be produced is also 5.548 moles.

The molar mass of H₂SO₄ is 98.08 g/mol. Therefore, the mass of H₂SO₄ that can be produced from 5.548 moles of H₂SO₄ is:

Mass of H₂SO₄ = 5.548 mol × 98.08 g/mol

= 544.5 g

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Answer:

EtOH stands for ethyl alcohol, which is the type of alcohol found in alcoholic beverages such as beer, wine, and spirits. It is a central nervous system depressant that can cause a range of effects, from mild relaxation to severe impairment of cognitive and motor functions. EtOH is often used in the medical and research fields as a short notation for Ethanol.

EtOH is the chemical label or acronym for ethyl alcohol (ethanol). EtOH refers to the kind of alcohol that can be found in alcoholic beverages like wine, beer, and spirits.

It is a depressant of the central nervous system that can have a variety of effects, ranging from mild relaxation to severe cognitive and motor impairment. In the medical and research industries, EtOH is frequently used as a short notation for ethanol.

It is used in the production of other chemicals, as a solvent, and in alcoholic beverages. Ethanol is a colorless, somewhat toxic substance. Solutions of ethanol and water that contain more than 50% ethanol are extremely flammable. The most well-known use of ethanol is as alcohol in alcoholic beverages.

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Answer:

6

Explanation:

In the Lewis structure drawn, we can see that there is a total of 3 bonds formed (2 bonds between N and one O and another bond between N and the other O)  2 electrons should participate to form each bond. So the total number of electrons forming covalent bonds is 6.

The root-mean-square speed Vrms for diatomic oxygen at 500°C is approximately 1281 m/s. To find the Vrms of diatomic oxygen at 500°C, we need to use the formula:

Therefore, the root-mean-square speed Vrms for diatomic oxygen at 500°C is approximately 1281 m/s.
Main answer: The root-mean-square (Vrms) speed for diatomic oxygen at 500° C is approximately 711.8 m/s.To calculate the root-mean-square speed for diatomic oxygen at 500° C, we'll use the following steps: Determine the molar mass ratio of diatomic oxygen to diatomic hydrogen.

We know that the molar mass of diatomic oxygen is 16 times that of diatomic hydrogen. Determine the temperature ratio. Convert the temperatures from Celsius to Kelvin. 50°C = 50 + 273.15 = 323.15 K, and 500°C = 500 + 273.15 = 773.15 K. Calculate the temperature ratio as (773.15 K) / (323.15 K) = 2.391. Calculate the Vrms for diatomic oxygen using the ratio of molar masses and temperature. Vrms_oxygen = Vrms_hydrogen * sqrt(M_hydrogen / M_oxygen) * sqrt(T_oxygen / T_hydrogen)

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Answer:

my sources say that there is a lot of empty space between then

Explanation:

their forces to attract each other is not strong

kinetic energy is always high in gasses

Answer: An insulator would be made out of material unable to conduct electricity due to lack of fluid movement for electrons, such as rubber. Rubber properties not only prevents them from freely moving, but also helps electrons stay tightly bound to each other.

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Answer:

See explanation.

Explanation:

1. There are 8 electrons. Elements that end with 2p orbitals are in the 2nd period (aka row) of the periodic table. Elements that have 4 electrons in 2p are in the 16th group (aka column) (column 16 may also be referred to as 6A) of the periodic table. So looking at row 2, column 16, we can see that the first diagram is of O, Oxygen.

2. 8 electrons. This is the same diagram as the one above.

3. 13 electrons. Elements ending with 3p are in period 3. Elements with 1 valence electron in a p orbital are in group 13 (aka group 3A).

4. 7 electrons. We already know 2p is period 2. 3 valence electrons in a p orbital means that it is in group 15/group 5A.

I did not write the answers for #3 and 4 but they can be easily found on a periodic table with the info I gave.

The elements given the above orbital diagrams are as follows:

Oxygen

Oxygen

Aluminum

Nitrogen

In first case,

There are total 8 electron and the electronic configuration is 1s2 2s2 2p4. The element which end up with 2p configuration belongs to 2nd period. It have four electron in their outermost shell so, it belongs to 16th group, So the element is Oxygen.

In the same way we will find the elements for rest of the cases.

Thus, we reach to the conclusion that the elements given the above orbital diagrams are as follows:

Oxygen

Oxygen

Aluminum

Nitrogen

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From the coefficients of the equation, we see that for every 4 moles of aluminum consumed, 3 moles of oxygen are consumed.

So, the answer is (12/4)(3) = 9 moles.

Answer:

algae

Explanation:

fish and herons arent herbivores

Herbivores are typically tagged as animals that feeds directly on the plants in a food chain.

In the given food chain, Fish is the herbivore

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Answer:

Independent variable- nature of irrigation water

Dependent variable- height of the plants

Explanation:

In every study, there must be an independent and a dependent variable. The dependent variable changes its value as the value of the independent variable changes.

When the nature of irrigation water is manipulated, the height of the plant changes accordingly. This implies that the nature of irrigation water (microwaved or tap water) is the independent variable while the height of the plant (the response) is the dependent variable.

We need to find the mass of 1.6x10^20 molecules of carbon monoxide

First, we must find the number of mol in the 1.6x10^20 molecules

For this, we need to use the avogadro's number ( 6.02*10^23 )

Then, we must calculate the molar mass of carbon monoxide

M(CO) = 12 g/mol + 16 g/mol = 28 g/mol

Finally, we must multiply the number of mol by the molar mass to find the mass

ANSWER:

0.007