Which of these components of the scientific research involves stating a relationship but not proposing an explanation for the relationship?
A. scientific law
B. hypothesis
C. observation
D. theory

The spatial orientation that involves more than one bond angle value is trigonal bipyramidal. This is because the trigonal bipyramidal geometry has five bonding positions, consisting of three equatorial positions and two axial positions.

The bond angles in the equatorial positions are 120°, while the bond angles in the axial positions are 90°. Therefore, in the trigonal bipyramidal geometry, there are two different bond angle values: 120° and 90°.

This orientation is commonly seen in molecules such as PF5, which has a trigonal bipyramidal geometry with the five fluorine atoms bonded to the central phosphorus atom.

Understanding the bond angles in different geometries is essential in predicting the reactivity and properties of molecules in chemistry.

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Most hydrocarbons in the atmosphere in rural areas arise from evaporation of gasoline. The correct answer is option (B).

While automobiles and industrial emissions can contribute to hydrocarbons in the atmosphere, studies have shown that in rural areas, the largest contributor is typically the evaporation of gasoline from fuel storage and use.Evaporation of gasoline is a significant source of hydrocarbon emissions in rural areas. Gasoline contains volatile hydrocarbons that can evaporate into the atmosphere, especially during refueling, storage, and other handling processes. This process releases hydrocarbons such as volatile organic compounds (VOCs) into the air.

Additionally, agricultural activities in rural areas can also contribute to hydrocarbon emissions. Certain agricultural practices, such as the use of certain fertilizers and livestock management, can release hydrocarbons into the atmosphere. This is due to the use of gasoline-powered equipment and vehicles, which can release hydrocarbons into the atmosphere through exhaust as well as evaporation from fuel tanks and spills. Hence option (B) is the correct answer.

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Answer:

6.6 moles of NH3

Explanation:

3.3 mol N2 * (2 mol NH3/ 1 mol N2) = 6.6 mol NH3

Answer:

All of our energy comes from the sun.

Explanation:

The sun sends out huge amounts of energy through its rays every day. Without the sun, life on earth would not exist, since our planet would be totally frozen.

The change that wilL occur is that the the reaction shifts to the right (products) to produce fewer moles of gas.

option C is correct.

The balanced equation is:

\(51.8 kJ + H_2(g) + 12(g) = 2HI(g)\)

From the left, there are 1 mole of H2 gas and 1 mole of I2 gas, which gives a total of 2 moles of gas.

In the right,  there are 2 moles of HI gas.

We can tell that there are more moles of gas on the left side than on the right side by comparing the amount of moles on each side.

According to Le Chatelier's principle, a decrease in volume will favor the side with fewer moles of gas.

In our scenario, the reaction will shift to the right  to produce fewer moles of gas.

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Answer:

there is no change

Explanation:

acellus correct

at the given temperature, HI will decompose into H2 and I2.

Given that the following reaction has an equilibrium constant value of

K = 46 at 783K: H2 (g) + l2 (g) = HI (g).

Initial pressures were given to be 55kPa for both hydrogen and iodine and 78kPa for hydrogen iodide which is at equilibrium. In this problem, Qp is the reaction quotient for pressures at the given instant. Qp has the same expression as Kp, but with initial pressures instead of equilibrium pressures.

Qp = p(HI) / [p(H2) . p(I2)] = 78 / [55 . 55] = 0.0241

K is the equilibrium constant and Q is the reaction quotient.Q is less than K. This implies that the reaction quotient will increase to match the equilibrium constant.

As a result, the reaction will shift forward to produce more HI. Thus, at the given temperature, HI will decompose into H2 and I2.

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Answer:

The solubility mainly depends on the composition of solute and solvent (including their pH and the presence of other dissolved substances) as well as on temperature and pressure.

Explanation:

Answer:

Ionization energy

Explanation:

Ionization energy can be defined as the energy needed to remove an electron from the outermost she'll.

Answer:

Oxygen is negative charge

Explanation:

And The 2 Hydrogens are positive charges

Answer:

you need to know the answer to what

Answer:

Explanation:

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

From the question

volume = 20 mL

density = 2 g/mL

The mass is

mass = 20 × 2

We have the final answer as

Hope this helps you

Answer:

Weight = mass × earth's gravitational acceleration

Explanation:

Follow the following steps to measure the mass and weight of an object:

The emission of an alpha particle always result in transmutation because the number of protons in the atom changes.

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Positive ions grow in magnitude from left to right, while negative ions grow in magnitude from right to left.

Any atom or collection of atoms with one or more positive or negative electrical charges is known as an ion.

The periodic table shows that there are more valence electrons on the right than the left. The maximum amount of ionic charge that an element can hold fluctuates as the number of valence electrons rises.

Second, metals on the periodic table's left side primarily produce positively charged ions. These ions get stronger over time, increasing in size.

The negative charges on the ions that non metals on the right side of the periodic table produce have a diminishing magnitude over time.

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Answer:

The atomic number of Chlorine(Cl) is 17 and the electronic configuration is 2,8,7 with seven electrons in the valence shell.

Hope that helps. x

Answer:

See below

Explanation:

Chlorine has 17 electrons in it's shell.

(See the attached file to get the idea of what subshell would be filled first).

The accommodations:

s = 2 electrons

p = 6 electrons

d = 10 electrons

f = 14 electrons

Now, the electronic configuration of chlorine:

1s²2s²2p⁶3s²3p⁵

(2+2+6+2+5 = 17 electrons)

\(\rule[225]{225}{2}\)

Hope this helped!

Answer:

B and C are the correct answers.

Answer:

they are either donated to or taken by another atom to achieve octet arrangement

Explanation:

for example Na+ and Cl- .. they both have one extra and one less electron .

so they donate and receive one electron to/from each other to achieve the octet arrangement ..

Answer:

I'm pretty sure that it's lithium because it gives up one of their 3 electrons, so li

Answer:

2NaOH + 2Al +2H2O = 2NaAlO2 +3H

Explanation:

Aluminum is an amphoteric element it reacts with both bases and acids to form a salt and hydrogen gas.The reaction is highly exothermic.

Answer to your question is given in the attachment

The basic first aid procedure for any chemical splash includes washing the affected area for at least 20 minutes with water

If a person experiences a chemical splash  the first step in providing first aid is to remove any contaminated clothing and wash the affected area thoroughly with water for at least 20 minutes. This will help to remove as much of the chemical as possible and prevent further chemical absorption through the skin. If the chemical is a strong acid or base, it's recommended to neutralize the chemical by rinsing with a solution of baking soda or vinegar.

It is also important to seek medical attention immediately after washing the affected area. If the chemical has caused damage to the eyes, the person should be transported to a hospital as soon as possible. If the person has inhaled fumes, they should be moved to a location with fresh air and seek medical attention if they have any difficulty breathing.

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Answer:

It would be about 1 g/mL.

Explanation:

With the information provided the volume of the chalk can be said to be about 5mL.

Hence;

Its density = 5g/5mL = 1g/mL.

C8 columns refer to chromatography columns that contain a stationary phase consisting of hydrocarbon chains with eight carbon atoms. c8 columns means none of the given options. The correct answer is (d) None of the above.

C8 columns refer to chromatography columns that contain a stationary phase consisting of hydrocarbon chains with eight carbon atoms. These carbon chains are typically covalently bonded to a solid support material.

The C8 designation represents the length and composition of the hydrocarbon chains in the stationary phase.

These columns are commonly used in chromatography techniques, such as reversed-phase liquid chromatography, where nonpolar compounds are separated based on their interactions with the hydrophobic stationary phase.

The C8 stationary phase provides moderate retention for analytes with different polarities, allowing for effective separation.

The statement about ionic bonding or the presence of a phenyl group is not applicable to C8 columns.

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Answer:

electrical and mechanical engineering

Answer:

electrical engineering

Explanation: i took quiz

The moles of CO2 are in the tank is mathematically given as

n=1.431

Question Parameters:

A 10-liter tank of CO2 is at a pressure of 3.5 atm and a temperature of

25°C.

Generally, the equation for the ideal gas  is mathematically given as

PV=nRT

Therefore

n=PV/RT

n=354.638kpa*10/8.314 J/mol·K *298k

n=1.431

In conclusion,  moles of CO2 is in the tank is

n=1.431

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The largest atom will be the one with the greatest number of protons and neutrons. To know which one of them is, we have to compare molecular masses and the greatest one will be the one of the largest atom.

From the given, iodine is the element with the greatest molecular mass, it means that this is the element with the largest neutral atom.

The answer is iodine.

Out of the given group, 68 individuals engage in all three behaviors of eating between meals, drinking alcoholic beverages, and smoking.

In the provided information, we are given data on three different behaviors: eating between meals, drinking alcoholic beverages, and smoking. The data states that 91 individuals engage in eating between meals and drinking alcoholic beverages, 100 individuals engage in smoking and eating between meals, and a total of 68 individuals participate in all three behaviors.

To understand the relationship between these behaviors, we can use a Venn diagram. Let's consider three overlapping circles representing the three behaviors. The circle representing eating between meals would have a size of 91 since that's the number of individuals engaging in this behavior. Similarly, the circle representing smoking would have a size of 100.

Now, within the intersection of these two circles, we find the number of individuals engaging in both behaviors, which is not explicitly given. However, we are provided with the information that 68 individuals participate in all three behaviors.

From this information, we can deduce that the overlapping region of the Venn diagram, representing individuals who engage in eating between meals, drinking alcoholic beverages, and smoking, has a size of 68. Therefore, we can conclude that out of the given group, 68 individuals participate in all three behaviors.

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0.950 mol (gray) moles of hydrogen gas are produced from the reaction.

What are Moles?

Moles are a unit of measurement in chemistry that represents the amount of a substance. A mole of a substance is equal to 6.022 x 10^23 particles (atoms, molecules, or ions) of that substance. This number is known as Avogadro's Number. The mole is used to measure the amount of a substance in a given sample.

In the reaction of 4.75 moles of zinc with an excess amount of hydrochloric acid, the ratio of moles of hydrogen gas produced is 1:2. This means that for every 1 mole of zinc reacted, 2 moles of hydrogen gas are produced. Therefore, the total amount of hydrogen gas produced in this reaction is 0.950 moles.

Hence, option D is correct.

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