On the basis of their positions in the periodic table, select the atom with the larger atomic radius in each of the following pairs:
(a) Na,Cs
(b) Be,Ba
(c)N,Sb
(D)F,Br
(e) Ne,Xe

It is important to allow the level of the solvent to drop to the level of the silica before adding the mixture in column chromatography because it ensures that the silica is saturated with the solvent up to the level of the silica, providing a uniform starting point for the mixture to move through the stationary phase.

It is important to allow the level of the solvent to drop to the level of the silica before adding the mixture in column chromatography because this ensures that the silica is saturated with the solvent up to the level of the silica.

Column chromatography is a purification technique used to separate components of a mixture.

It relies on differences in the interactions between the sample mixture's components and the stationary phase.

The stationary phase is usually solid support such as silica gel or alumina packed into a glass or plastic column.

The solvent is a liquid that is used to dissolve a solute, resulting in a solution.

In chromatography, the solvent is the mobile phase.

It moves through the stationary phase, carrying the components of the sample mixture with it.

The choice of solvent in column chromatography depends on the properties of the sample mixture's components.

When the level of the solvent is allowed to drop to the level of the silica before adding the mixture, it ensures that the silica is saturated with the solvent up to the level of the silica.

This is important because it creates a uniform starting point for the mixture to move through the stationary phase.

If the mixture is added before the solvent level has dropped, the solvent front may not be level with the silica, which can result in uneven movement of the components of the mixture through the stationary phase.

This can lead to poor separation of the components and reduce the effectiveness of the purification technique.

In conclusion, it is important to allow the level of the solvent to drop to the level of the silica before adding the mixture in column chromatography because it ensures that the silica is saturated with the solvent up to the level of the silica, providing a uniform starting point for the mixture to move through the stationary phase.

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The total mass of the products is 853.8 g.

We know that we have to apply the principles of stoichiometry so as to be able to obtain the mass of the mass of the products and then the total mass of the products that is obtained in the reaction.

We have that in the question; 496. 5 grams of lead II nitrate reacts with potassium bromide is such a way that the lead II nitrate would be completely consumed in the reaction. This means that the lead II nitrate is the limiting reactant in the reaction.

Number of moles of the lead II nitrate = 496. 5 grams /331 g/mol

= 1.5 moles

If 1 mole of  lead II nitrate produces 1 mole of lead II bromide

Mass of lead II bromide produced = 1.5 moles * 367 g/mol

= 550.5 g

If 1 mole of lead II nitrate produces 2 moles of potassium nitrate

1.5 moles of lead II nitrate produces  1.5 * 2 /1

= 3 moles of  potassium nitrate

Mass of  potassium nitrate = 3  moles * 101.1

= 303.3 g

Total mass produced = 550.5 g + 303.3 g

= 853.8 g

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The range of the of the oxidation number of the first transition series is +2 to +6.

Transition elements or transition metals are elements or metals that have partially filled d orbitals.

The first main transition series begins with either;

Thus, the range of the of the oxidation number of the first transition series is +2 to +6.

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Answer:

I would tell him to open the tent in order to breathe frsh air.

Explanation:

Even if propane is not ignited, the buildup of the gas can be deadly due to inhalation. Breathing the gas can cause hypoxia, which is a form of oxygen deprivation that can lead to death. Hence you shouldnt use propane indoors.

Answer:

I think the answer is assume

Answer: The empirical formula of the compound becomes \(TiCl_5\)

Explanation:

The empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound.

Given values:

Mass of Ti = 0.72 g

Mass of Cl = 2.85 g

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

To formulate the empirical formula, we need to follow some steps:

Molar mass of Ti = 47.9 g/mol

Molar mass of Cl = 35.6 g/mol

Putting values in equation 1, we get:

\(\text{Moles of Ti}=\frac{0.72g}{47.9g/mol}=0.015 mol\)

\(\text{Moles of Cl}=\frac{2.85g}{35.6g/mol}=0.080 mol\)

Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.015 moles

\(\text{Mole fraction of Ti}=\frac{0.015}{0.015}=1\)

\(\text{Mole fraction of Cl}=\frac{0.080}{0.015}=5.33\approx 5\)

The ratio of Ti : Cl = 1 : 5

Hence, the empirical formula of the compound becomes \(Ti_1Cl_5=TiCl_5\)

The correct diagram is W.

A diagram is often a -dimensional display that communicates the use of visual relationships. it is a simplified and dependent visual representation of ideas, ideas, buildings, family members, statistical records, anatomy, etc. it can be used for all elements of human activities to give an explanation for or illustrate a topic. example Diagrams are graphics that show a photo, or photographs, accompanied with the aid of either note, labels, or a legend, which will explain principles or techniques. Describe gadgets or locations.

Display how matters paintings, circulate or change. assist provide extra perception into the issue displayed. A diagram is a drawing that suggests the distinctive parts of something and the way they work collectively. three-Line diagram is part of the detailed design document. Used for manipulating designing circuit diagrams, managing circuits, segment sequencing, differential relay placing, and metering transformer connection. A records chart is a sort of diagram or graph, that organizes and represents a set of numerical or qualitative information.

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The answer is option A: Work. Work is not a state function.

State functions are properties that depend only on the current state of a system and are independent of the path taken to reach that state. In other words, they are determined by the initial and final states of the system and not by the process or pathway between them.

Entropy (option B), enthalpy (option C), and internal energy (option D) are all examples of state functions. Entropy is a measure of the system's disorder or randomness, enthalpy is the total heat content of a system, and internal energy is the sum of the system's kinetic and potential energy.

On the other hand, work (option A) is not a state function because it depends on the pathway or process by which the system undergoes a change. Work is the energy transferred to or from a system due to a force acting on it. The amount of work done on or by the system can vary depending on the specific process or conditions involved.

Therefore, among the given options, work is the only one that is not a state function.

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Answer:

Option C, KCl

Explanation:

It is the KCl that gives a lilac flame during the flame test.

The color given by different salt during the flame test are as follows -

a) KCl - Lilac

b) NaCl - yellow

c) MgCl - Orange-red

d) LiCl - red (crimson)

Hence, option C is correct

Answer:

a. .125 mol b. 7.25g

Explanation:

a. To get the moles multiply the volume by the molarity.

.5L*.25M=.125mol NaCl

b. The molar mass is provided so multiply the moles by the molar mass to get the amount of grams of nacl.

.125mol*58molar mass=7.25g nacl to make the solution

1. The empirical formula of the compound is C₅H₅O

2. The molecular formula of the compound is C₁₀H₁₀O₂

We'll begin by calculating the mass of C, H and O in the compound. This can be obtained as follow:

Mass of CO₂ = 212 mg

Molar mass of CO₂ = 44 g/mol

Molar mass of C = 12 g/mol

Mass of C = 12/44 × 212

Mass of H₂O = 43.4 mg

Molar mass of H₂O  = 18 g/mol

Molar mass of H₂ = 1 × 2 = 2 g/mol

Mass of H = 2/18 × 43.4

Mass of C = 57.82 mg

Mass of H = 4.82 mg

Mass of compound = 78.1 mg

Mass of O = (Mass of compound ) – (mass of C + mass of H)

Mass of O = 78.1 – (57.82 + 4.82)

1. Determination of the empirical formula of the compound.

Mass of C = 57.82 mg

Mass of H = 4.82 mg

Mass of O = 15.46 mg

Divide by their molar mass

C = 57.82 / 12 = 4.818

H = 4.82 / 1 = 4.82

O = 15.46 / 16 = 0.966

Divide by the smallest

C = 4.818 / 0.966 = 5

H = 4.82 / 0.966 = 5

O = 0.966 / 0.966 = 1

Therefore, the empirical formula of the compound is C₅H₅O

2. Determination of the molecular formula of the compound.

Molar mass of compound = 162 g/mol.

Empirical formula = C₅H₅O

Molecular formula = empirical formula × n = molar mass

[C₅H₅O]n = 162

[(12×5) + (5×1) + 16]n = 162

[60 + 5 + 16]n = 162

81n = 162

Divide both side by 81

n = 162 / 81

Molecular formula = [C₅H₅O]n

Molecular formula = [C₅H₅O]₂

Thus, the molecular formula of the compound is C₁₀H₁₀O₂

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When all the free energy from the metabolism of glucose, C6H12O6(s)+6O2(g)→6CO2(g)+6H2O(l) goes into the conversion of ADP to ATP, 30.5 moles of ATP can be produced for each mole of glucose.

ATP (Adenosine triphosphate) is an organic chemical compound that provides energy to drive many metabolic processes in living cells by transferring its phosphate group to other molecules. It is found in all types of life, including bacteria, plants, animals, and humans, and it is the main energy currency of the cell.

In the presence of oxygen, a cell's metabolism can produce up to 38 ATP molecules per glucose molecule through oxidative phosphorylation, which includes ATP synthesis in the electron transport chain.

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Answer:

it's the first one liquid because the atoms are close together with no regular arrangement vibrant but generally do not move from place to place

gas particles are normally all over the place and if you put them in a sealed container the particles will jump around and be all of the container

solid particles with set all together and not move and it will not try to mold to the shape of the container

liquid particles move around and try to shape to the container

The number of moles of reactants and products can be used to obtain the mass of products formed. The results obtained are as follows;

The question says that HCl was in excess. It means that after the reaction, we will have unreacted HCl(aq) and  ZnCl2(aq) in the remaining solution.

Hence;

Mass of ZnCl2(aq) formed = 36.309g - 35.123g  = 1.186g

Number of moles ZnCl2(aq) formed = \(\frac{mass of ZnCl2(aq) formed}{molar mass of ZnCl2}\)

\(\frac{1.186g}{136.286 g/mol}\) = 0.0087 moles

From the reaction equation;

\(Zn (s) + 2HCl(aq) - > H2(g) + ZnCl2 (aq)\)

To obtain the amount of Zn reacted

1 mole of Zn yields 1 mole of ZnCl2

x moles of Zn yields 0.0087 moles of ZnCl2

x = 0.0087 moles of Zn

a) 1 mole of Zn yields 1 mole of H2

0.0087 moles of Zn yields 0.0087 moles of H2

Mass of H2 = 0.0087 moles of H2 * 2 g/mol = 0.0174 grams

b)

Mass of Zn reacted =  0.0087 moles of Zn * 65.38 grams/mole = 0.5688 grams

c)

Percentage of Zn in the alloy = 0.5688 grams/1.203g * 100 = 47.3 %

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Answer:

Explanation:

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

From the question

volume of liquid = 15 mL

density = 2.5 g/mL

We have

mass = 15 × 2.5

We have the final answer as

Hope this helps you

Answer:

A. Single replacement

Explanation:

Na replaces Mg as the cation

The evidence that indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier: Whole logs mixed in with the rocks, Clay-sized particles and An abundance of snow and ice

The following evidence indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier:

Whole logs mixed in with the rocks: The presence of whole logs mixed in with the rocks suggests a rapid and powerful flow, characteristic of a lahar, rather than the slow movement associated with glaciers.

Clay-sized particles: The presence of clay-sized particles is often associated with lahars, as they can be easily transported by the flowing volcanic material.

An abundance of snow and ice: The presence of snow and ice is indicative of a recent event, as glaciers tend to accumulate and retain snow and ice over time. In the case of a lahar, the presence of snow and ice suggests a more recent deposition.

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In 10 minutes, one collects 100 times as much light with a 10-meter diameter telescope as with a 1-meter diameter telescope.

The amount of light collected by a telescope is directly proportional to the area of its aperture.
Let A1 and A2 be the apertures of the 1-meter diameter telescope and the 10-meter diameter telescope, respectively.
The area of the 1-meter diameter telescope is: A1 = (π/4) × (1m)² = 0.785 m²
The area of the 10-meter diameter telescope is: A2 = (π/4) × (10m)² = 78.54 m²
Thus, the ratio of the areas is A2/A1 = 78.54 m² / 0.785 m² = 100.
The ratio of the amount of light collected by the 10-meter diameter telescope to that collected by the 1-meter diameter telescope is therefore 100. In 10 minutes, the 10-meter diameter telescope collects 100 times as much light as the 1-meter diameter telescope.

In summary, in 10 minutes, one collects 100 times as much light with a 10-meter diameter telescope as with a 1-meter diameter telescope.

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Answer:

Explanation:

0.25 M

The molarity of a solution will be 4.27M .

Molarity (M), often known as molar concentration, is the concentration of a solution expressed in moles of solute per liter of solution.

Solution can be considered as a mixture of more than one component. It may be homogeneous solution as well as heterogeneous solution.

Gram to mole conversion:

\(=\;2.75\;g.\;\frac{1\;mol}{58.44g} \\=\;0.0470 \;mol\)

Molarity of the solution can be calculated by using the following formula:

It is calculated that, moles of solute = 0.0470 mol, volume of the solution = 1100 mL.

Now, put the value of given data in molarity formula:

\(Molarity=\frac{Moles\;of\;the\;solute}{Volume \;of\; the\; solution} \\=\frac{0.0470\;mol}{1100 \;mL} \\=\;4.27\;mol/mL\\=\;4.27\; M\)

Therefore,  the molarity of a solution will be 4.27M.

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An exothermic reaction is the chemical reaction which releases heat to the surroundings. Among the options you provided, the example of an exothermic reaction is ammonium nitrate dissolving in water. Option A is correct.

This reaction is exothermic because the dissolution process releases heat to the surroundings, as well as the temperature of the solution will increases.

The other examples you provided, such as the dissolving of concentrated hydrochloric acid, ammonium chloride, and sugar in water, are all exothermic processes as well, but they are not chemical reactions, as no new substances are formed. They are simply physical changes, where the substances dissolve in the solvent.

Hence, A. Ammonium nitrate dissolving in water is the correct option.

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--The given question is incorrect, the correct question is

"Which example is an exothermic reaction? A) ammonium nitrate dissolving in water B) concentrated hydrochloric acid dissolving in water C) sugar dissolving in water D) ammonium chloride dissolving in water."--

Answer:

Nonmetals have more valence electrons and increase their stability by gaining electrons to become anions.

Answer: Because they are on the father side of the periodic table

Explanation: Electronegativity increases as you move from left to right on the periodic table

Answer:

atomic mass

Explanation:

A British chemist named John Newlands  organized the elements known at that time into a system of  periodicity based on an order of increasing atomic masses.

In his table, it was found that every eight elements had similar properties. He called this observation the law of octaves.

Currently, the periodicity of elements is based on increasing atomic numbers and this is generally called the modern periodic law.

Answer:

Difference : group 1 elements are known as alkali metals, group 7 elements are known as transition metals

Similarities : Both group 1 and 7 elements become more reactive as u go down and up respectively

To prepare 240 mL of two-thirds strength hydrogen peroxide solution for a wound irrigation using normal saline as the diluent, you need to mix 160 mL of full-strength hydrogen peroxide with 80 mL of normal saline.

This creates a total volume of 240 mL, with two-thirds of it being hydrogen peroxide and one-third being normal saline.

When using a hydrogen peroxide solution for wound irrigation, it is important to ensure that the concentration of the solution is appropriate for the type of wound being treated. Generally, hydrogen peroxide solutions of 2-3% concentration are used for wound irrigation. Higher concentrations can cause tissue damage and skin irritation.

Additionally, it is important to ensure that the diluent used is appropriate for the type of wound being treated. For example, normal saline is most commonly used for wound irrigation, but other diluents such as sterile water may be used for different types of wounds.

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Answer:

\(3.5\) pill need to taken for completing dosage of \(875\) mg

Explanation:

Total dosage of medicine to be taken in a day

\(= 2 * 875 \\= 1750\)mg

Total weight of one pill \(= 250\) mg

Number of pills required is equal to total dosage of medicine divided by the weight of one pill.

Hence,

Number of pills

\(= \frac{875}{250} \\= \frac{175}{50} \\= \frac{35}{10} \\= 3.5\)

Answer: An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. ... Color, temperature, and solubility are examples of intensive properties.

Explanation:

An intensive property of iron is density while an extensive property of iron is mass.

WHAT ARE INTENSIVE AND EXTENSIVE PROPERTIES?

Regarding iron as an element, one intensive property it posseses is density while one extensive property is its mass.

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