Two elements in the same period have the same number of _____ _____ in their electron clouds.

Answer:

A search warrant is a document that is signed by the district attorney, and authorizes the search of a building for the purpose of collecting evidence at a crime scene.

In this question, we need to find which molecules are considered to be nonpolar, let's analyze each one of the options:

Butanoic Acid is considered to be similar to oil, therefore is slightily soluble in water but more soluble in nonpolar substances, therefore can be considered nonpolar

Carbohydrates are considered polar, being able to dissolve in water, this is due to the OH functional group in the molecules

Muscles, this is not easy to answer, since muscles are composed of many compounds, therefore this one in specific I can't say if it's one or another

Proteins can have a strong nonpolar side chain, making it similar to oil in water, nonpolar

Cell membranes, another case in which the answer is not clear, since a regular cell membrane has both polar and nonpolar parts

Answer:

magnesium has a higher ionization energy because its radius is smaller. calcium has a higher ionization energy because it outermost sub-energy level is full. they have the same ionization energy because they have the same number of valence electrons.

Explanation:

hope this helps

Answer:

Sodium and chlorine ions come together to form sodium chloride or NaCl. The sodium atom in this compound loses an electron to become Na+, while the chlorine atom gains an electron to become Cl-. Together, they form a neutral compound because the ions balance each other out.

Explanation:

Answer:

\(V=162L\)

Explanation:

Hello,

In this case, we can compute the required volume by using the ideal gas equation as shown below:

\(PV=nRT\)

Thus, solving for the volume and considering absolute temperature (in Kelvins), we obtain:

\(V=\frac{nRT}{P}= \frac{4.70mol*0.082\frac{atm*L}{mol*K}*(21+273)K}{0.700atm} \\\\V=162L\)

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Answer:

Before we can sketch the Lewis structures of molecules, we must first understand the octet rule. The octet rule asserts that when atoms combine to create compounds, electrons are gained, lost, or shared among them, resulting in a stable electron configuration defined by eight valence electrons as a result. These rules are used in conjunction with the main-group components of the second period.

Explanation:

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Answer:

the mass of FeSO4.7H2O  in  the 2.810 g sample was 1.5402 g

Explanation:

From the given information:

Two  moles of FeSO4.7H2O = one mole of  Fe2O3

Let recall that:

number of moles of  Fe2O3 = mass of  Fe2O3 / molar mass of  Fe2O3

Given that :

mass of Fe2O3 = 0.443 g

number of moles of  Fe2O3 = 0.443 g/ 159.69 g/mol

number of moles of  Fe2O3 = 0.00277 mol

Thus;

number of moles of FeSO4.7H2O = 2 ×  Fe2O3

number of moles of FeSO4.7H2O = 2 × 0.00277 mol

number of moles of FeSO4.7H2O = 0.00554 mol

However from the usual stoichiometry formula; the mass of a substance = number of moles  × molar mass

Now; the mass of FeSO4.7H2O = number of moles × molar mass

the mass of FeSO4.7H2O = 0.00554 mol × 278.01 g/mol

the mass of FeSO4.7H2O = 1.5402 g

Therefore; the mass of FeSO4.7H2O  in  the 2.810 g sample was 1.5402 g

Answer:

N₂ + 3H₂ → 2NH3

4Fe + 2Cl₂ → 4FeCl

Explanation:

This equations are now balanced

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Answer:

Constant temperature variations

Explanation:

With temperature constantly heating many molecules within many forms of matter tend to move around. Take air for instance and density. When air is hot the molecules are moving very quickly because they are being what is known as energized (I don't know the scientific word I apologize.) However, when air is cold it tends to get harder to breath and that is because the air is more dense, since the molecules are atoms are much more compacted.

To further detail the process of cooling and heating up matter, water when it is cooled it tends to become ice; a solid based structure. Therefore, making it more dense or more compacted together. However, once heated the molecules begin to spread apart, in which the density lessens and the molecules become a liquid state or a gas state (depending on the amount of heat applied in terms of kelvin.)

Answer:

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Explanation:

The physical change would be the sugar dissolving in water because no reaction is occurring.

sugar dissolving in warm water is an example of physical change.

physical change is doesn't alter the composition or the identity of the substance .

That's mean when you dissolves sugar in water, after a while the object will be the same which mean that the component doesn't change

Taking into account the reaction stoichiometry, 1 mole of H₂ can be produced by reacting 2 moles of HCI.

In first place, the balanced reaction is:

Mg + 2 HCl  → MgCl₂ + H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

By reaction stoichiometry 2 moles of HCl form 1 mole of H₂.

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The final concentration of I ions in the resulting solution is approximately 0.0311 M, expressed with three significant figures.

To determine the final concentration of I ions in the resulting solution, we need to consider the stoichiometry and volumes of the solutions being mixed.Given:

Volume of NH4l solution = 129.13 mL

Concentration of NH4l solution = 112.9 mM = 0.1129 M (converting from millimolar to molar)

Volume of Mgl2 solution = 105.31 mL

Concentration of Mgl2 solution = 0.87 M

First, we need to determine the moles of NH4l and Mgl2 in their respective solutions:

Moles of NH4l = Volume of NH4l solution * Concentration of NH4l solution

Moles of NH4l = 0.12913 L * 0.1129 M = 0.01459 moles NH4l

Moles of Mgl2 = Volume of Mgl2 solution * Concentration of Mgl2 solution

Moles of Mgl2 = 0.10531 L * 0.87 M = 0.09157 moles Mgl2

Next, we determine the limiting reagent, which is the reactant that is completely consumed and determines the maximum amount of product formed. In this case, the limiting reagent is NH4l because it has fewer moles than Mgl2.

The balanced chemical equation for the reaction between NH4l and Mgl2 is:

2 NH4l + Mgl2 → 2 NH4+ + MgI2

From the balanced equation, we can see that for every 2 moles of NH4l, we get 1 mole of MgI2.

Since the moles of NH4l is the limiting reagent, it will be completely consumed, and the moles of MgI2 formed will be half of the moles of NH4l.

Moles of MgI2 = 0.01459 moles NH4l * (1 mole MgI2 / 2 moles NH4l) = 0.007295 moles MgI2

Finally, we calculate the final concentration of I ions in the resulting solution:

Volume of resulting solution = Volume of NH4l solution + Volume of Mgl2 solution

Volume of resulting solution = 0.12913 L + 0.10531 L = 0.23444 L

Final concentration of I ions = Moles of MgI2 / Volume of resulting solution

Final concentration of I ions = 0.007295 moles / 0.23444 L = 0.0311 M

Therefore, the final concentration of I ions in the resulting solution is approximately 0.0311 M, expressed with three significant figures.

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Answer:430 mg/L = 0.43g/L 

Explanation:

The partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg (calculated by subtracting the partial pressure of water, 17.0 mm Hg, from the total atmospheric pressure, 750.0 mm Hg).

When a gas is collected over water, the presence of water vapor affects the total pressure observed. In this case, the total atmospheric pressure is given as 750.0 mm Hg, and the partial pressure of water vapor at 19.5°C is 17.0 mm Hg.

To determine the partial pressure of hydrogen, we need to subtract the partial pressure of water vapor from the total atmospheric pressure. Partial pressure refers to the pressure exerted by an individual gas component in a mixture. In this scenario, the collected gas is primarily hydrogen, with water vapor being the other component.

By subtracting the partial pressure of water vapor (17.0 mm Hg) from the total atmospheric pressure (750.0 mm Hg), we can find the partial pressure of hydrogen:

Partial pressure of hydrogen = Total atmospheric pressure - Partial pressure of water vapor

Partial pressure of hydrogen = 750.0 mm Hg - 17.0 mm Hg

Partial pressure of hydrogen = 733.0 mm Hg

Therefore, the partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg.

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molar mass of empirical formula = (20 x 12.01 g/mol) + (24 x 1.01 g/mol) + (1 x 14.01 g/mol) = 324.44 g/mol ratio = 324.44 g/mol / 324 g/mol = 1.001. The molecular formula of quinine is C20H24N.

The active component of cinchona extracts, which have been used for this purpose since before 1633, is utilized as an antimalarial medication. Quinine has been utilized in conventional cold remedies for its use as a mild antipyretic and analgesic.

Plasmodium falciparum malaria is treated with quinine. Malaria is brought on by the parasite Plasmodium falciparum, which enters the body through the red blood cells. Quinine functions by either eliminating the parasite or halting its growth.

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Answer:

1.674 x 10^-23 grams

Explanation:

Hydrogen-1 is called Protium

wikipedia

atomic mass of Protium is 1.00794 amu

sciencedirectcom

atomic mass of 10 Protiums is 10.0794 amu

10.0794 amu in grams is

1.6737236x10^-23 grams

Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.

To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:

Molarity (M) = moles of solute / volume of solution (in liters)

First, let's convert the volume of the solution from milliliters (mL) to liters (L):

5000 mL = 5000/1000 = 5 L

Now, we can rearrange the formula to solve for moles of solute:

moles of solute = Molarity (M) x volume of solution (L)

moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol

Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:

mass of solute = moles of solute x molar mass of solute

mass of glucose = 1.075 mol x 180.16 g/mol

mass of glucose = 194.0 g (rounded to three significant figures)

Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.

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exactly 22.0 grams

because freezing is a physical change not a chemicl change..so nothing is taken away or added

ANSWER;

exactly 22.0 grams

because freezing is a physical change not a chemicl change..so nothing is taken away or added

Toluene does not undergo reaction with bromine water due to aromatic stabilization.

The term addition reaction refers to a type of reaction in which atoms or groups are added across the double bond. This type of reaction is common to alkenes and alkynes. By this reaction, unsaturated compounds are reduced to their saturated monologues.

We know that due to aromatic stabilization, compounds that contain the aromatic sextet do not undergo addition reaction such as the addition of bromine. Rather, what occurs in such systems is a substitution reaction under appropriate conditions.

It then follows that toluene does not undergo reaction with bromine water due to aromatic stabilization.

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The body of scientific knowledge is based on different Observations (Option C).

Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.

In conclusion, the body of scientific knowledge is based on different Observations (Option C).

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1) Diesel has a higher viscosity than petrol.

2) Petrol is more flammable than diesel.

3) The formula will be C₁₀H₂₂.

4) The equation is; 2C8H18+25O2→16CO2+18H2O.

Depending on the precise composition and temperature, the viscosity of gasoline and diesel can change. In general, diesel is more viscous than gasoline. Higher viscosity fluids are thicker and flow more slowly than lower viscosity fluids because viscosity relates to the resistance of a fluid to flow.

Diesel is less flammable than gasoline. The lowest temperature at which gasoline can evaporate and turn into an ignitable combination in air is known as its flash point, and it is lower for gasoline. Compared to diesel fuel, petrol vapors are much more flammable and can ignite at lower temperatures.

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As a rough estimate, there may be several tens of possible resonance structures for tetraphenylmethane, depending on how you count them. However, it is not possible to give a precise number without a more detailed analysis of the molecule and its resonance structures.

Tetraphenylmethane is a molecule that consists of four phenyl groups bonded to a central carbon atom. Phenyl groups are aromatic ring systems that consist of six carbon atoms bonded in a ring, with one hydrogen atom bonded to each carbon atom.

In general, aromatic molecules can have multiple resonance structures, which are different ways of representing the bonding and electron distribution in the molecule using Lewis structures.

Therefore, There are several possible resonance structures for tetraphenylmethane, but the exact number will depend on how you count the different structures. For example, you could consider the resonance structures that differ in the position of the double bonds within the molecule, or you could consider the resonance structures that differ in the distribution of lone pairs of electrons on the central carbon atom.

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Answer:

i) The size of X ion is greater than that of X atom even though both contain the same number of protons because the ion has fewer electrons compared to the atom. When an atom forms an anion (negative ion), it gains electrons, which causes increased electron-electron repulsion. This repulsion causes the electron cloud to expand, and as a result, the ion becomes larger than the neutral atom.

In the case of element X, when it forms an ion with a -3 charge, it will gain 3 more electrons, increasing the total number of electrons to 18. This will cause the size of the X ion to be larger than the neutral X atom.

ii) To determine the compound of X in the -3 oxidation state, we first need to determine the element's identity. We know that X has 15 electrons in total (2 in the K shell, 8 in the L shell, and 5 in the M shell). Therefore, X has an atomic number of 15, which corresponds to phosphorus (P).

Since phosphorus is in the -3 oxidation state, it gains 3 electrons and becomes P^3-. To form a compound, we need a cation that can balance the negative charge. A common example is aluminum (Al), which has a +3 charge (Al^3+). When phosphorus and aluminum combine, they form the compound aluminum phosphide with the formula AlP.

Answer:

See explanation and image attached

Explanation:

The mechanism of this reaction is shown in the image attached. The image was obtained from HomeworkLib.

The first step in the reaction is protonation and loss of -OH2. A carbocation is now created which undergoes a 1,2 hydride shift. This yields a tertiary carbocation which is more stable.

A racemic mixture of two products, major and minor are now obtained as shown.

Answer:

The pH at 25°C of 0.33M solution is 5.36.

Explanation:

Let us calculate -:

\(NaC_6H_5CO_2$\rightarrow$ salt of weak acid + sodium benzoate\)

pH of salt of weak acid and sodium benzoate is given by-

pH =\(7+\frac{1}{2}pk_a+\frac{1}{2}log (concentration of salt)\)  

concentration of salt = 0.33M

\(pK_a=4.2\)

\(pH = 7 +\frac{4.2}{2} +\frac{1}{2}log (0.33)\)

\(pH=7 +\frac{4.2}{2} + \frac{(-0.4815)}{2}\)

 pH   = 5.36

Hence , the answer is 5.36

Answer:

3.125%

Explanation:

After 1 half life it remains 50%

After 2 half lines it remains 25%

After 3 half lines it remains 12.5 %

After 4th half life it remains 6.25%

After 5th half life it remains 3.125%

Answer:

We know that there are 6.022 * 10²³ atoms in 1 mole of any element

So, that means that there are 6.022 * 10²³ atoms in 1 mole of Li (Lithium)

Atoms in 3.7 Moles:

atoms in one mole = 6.022 * 10²³

atoms in 3.7 moles = 6.022 * 10²³ * 3.7

atoms in 3.7 moles = 22.28 * 10²³

atoms in 3.7 moles = 2.228 * 10²⁴

Answer:

2.5M

Explanation:

Molarity is the measure of the molar concentration of a solution. It is calculated using the formula below:

Molarity = n/V

Where;

n = number of moles (mol)

V = volume (L)

According to the information about Calcium chloride (CaCl2) provided in this question;

n = 0.5moles

M = 0.20M

Molarity = 0.5/0.2

Molarity = 2.5M