Classify each by whether they are, or tend to form, cations or anions.

positively charged
Metals
Have more electrons than protons
Group 1A (group 1)
Group 7A (group 17)
Nonmetals
K+
Br-

A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.

Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.

Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.

Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.

Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.

The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.

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Its option e

Why?

\(\\ \sf\longmapsto 0.000354\times 10^4\)

It can be written as

\(\\ \sf\longmapsto \dfrac{354}{10000}\times 10^4\)

\(\\ \sf\longmapsto \dfrac{354}{10^4}\times 10^4\)

\(\\ \sf\longmapsto 354\)

Hence its wrongly written

d is also wrong

\(\\ \sf\longmapsto 75.3\times 10^2\)

\(\\ \sf\longmapsto \dfrac{753}{10}\times 100\)

\(\\ \sf\longmapsto 7530\)

It is false that when two water molecules are near each other, a hydrogen bond will form between the more positive and the more negative atoms.

A water particle is composed of two hydrogen atoms and one oxygen atom.

When there are two water particles close a bond is formed between the hydrogen atom of one particle and the oxygen atom of a neighbor water particle, which means there is a hydrogen-oxygen bond rather than a hydrogen-hydrogen bond.

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It is True that when two water molecules are near each other, a hydrogen bond will form between the more positive hydrogen atom of one molecule and the more negative oxygen atom of the neighboring molecule.

A water molecule is made up of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, forms a bond with hydrogen atoms. It also carries two pairs of unshared electrons. All of the electron pairs (shared and unshared) repel each other.

Hydrogen bond will form between the more positive and the more negative atoms of neighboring water molecules when two water molecules are near each other. This is due to the polar nature of water molecules, which have a slightly positive charge on the hydrogen atoms and a slightly negative charge on the oxygen atoms. These hydrogen bonds give water many of its unique properties, such as its high surface tension and high heat of vaporization.

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The differences in the distribution of solar energy on Earth's surface is due to Earth’s curved shape and tilt on its axis do not allow the sun’s rays to fall evenly on its surface.

The correct option is D.

Solar energy refers to the energy produced by the Sun.

Solar energy is in the form of heat energy, light energy, and ultraviolet radiation.

The shape of the affects the amount of solar energy that reaches any region of the earth. The earth is spherical in shape. Hence, there is an uneven distribution of solar energy from the sun o the Earth. also, the tilt of the earth affects the amount of solar energy that reaches any region of the earth.

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Answer:

Explanation:

Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. ... A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons.

To find moles when given the molar mass, you can use the concept of molar mass as a conversion factor.Molar mass represents the mass of one mole of a substance, expressed in grams per mole (g/mol).

To calculate moles, divide the given mass of the substance by its molar mass. The equation is:

moles = mass / molar mass

For example, if you have 56 grams of carbon dioxide (CO2) and want to find the number of moles, you need to know the molar mass of CO2, which is approximately 44 g/mol. Using the equation above:

moles = 56 g / 44 g/mol

moles ≈ 1.27 mol

Therefore, there are approximately 1.27 moles of carbon dioxide in 56 grams.

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The first image shows cleavage, same as the second. The third image shows fracture

1. Image 1:

2. Image 2

Image 3:

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Answer:

HCl + AgNO3 ------ AgCl + HNO3

Explanation:

HCl is an acid called hydrochloric acid, while AgNO3 is a base called Silver Nitrate.

Hope it helps.

The result of the computation when you follow the steps is 1.699.

A logarithm is a mathematical function that represents the exponent or power to which a specific base must be raised to obtain a given number. In simpler terms, it answers the question: "To what power must we raise a base number to obtain a certain value?"

What you should do is that on your calculator, you could press the logarithm key and then put in the value that has been shown and then the result would be displayed on your calculator.

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The true statements are;

The reaction is endothermic

Heat is a reactant

ΔHrxn is 89 kJ/mol

Enthalpy is a thermodynamic property that represents the total energy of a system, including both its internal energy (the energy of its constituent particles) and the energy it has due to its temperature and pressure. It is commonly used in energy analysis and heat transfer calculations and is expressed in units of joules (J) or calories (cal).

We know that the enthalpy of the reaction can obtained from;

Enthalpy of the products - Enthalpy of the reactants

ΔH reaction = 2(-391.4) - 2(-435.9)

(-782.8) - (-871.8)

= 89 kJ/mol

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B. Cao(s) (Calcium oxide)

The balanced equation would be:

Ca(s) + O2(g) --> Cao(s)

It is the product of Calcium oxide.

The product of the reaction between sodium and chlorine is sodium chloride (NaCl). When sodium (Na) and chlorine (Cl) react, they form an ionic bond, with the sodium atom losing one electron to the chlorine atom. This forms a positively charged sodium ion (Na+) and a negatively charged chloride ion (Cl-), which are held together by electrostatic attraction to form the compound sodium chloride. It is a white crystalline solid and is commonly known as table salt.

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At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

hey there!

atomic mass cobalt = 58.9332 amu

therefore:

1 mol Co ------------ 58.9332 g

moles ------------ 50 g

moles = 50 x 1 / 58.9332

moles  = 50 / 58.9332

 = 0.8484 moles of Co

Hope this helps!

0.8484 moles are in 50 grams of cobalt.

A mole is defined as 6.02214076 × \(10^{23}\) of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Atomic mass cobalt = 58.9332 amu

Therefore:

1 mol Co ------------ 58.9332 g

moles ------------ 50 g

moles = 50 x 1 ÷ 58.9332

moles  = 50 ÷ 58.9332

= 0.8484 moles of Co

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Answer:

D

Explanation:

Transfer of electrons from Na to Cl

Na has configuration of 2,8,1 it will lose one electron to Cl with configuration of 2,7 inorder for both to attain an octet configuration

Answer:

\(\boxed {\boxed {\sf About \ 270 \ grams \ of \ Na_2 S}}\)

Explanation:

To convert from moles to grams, the molar mass must be used.

1. Find Molar Mass

The compound is sodium sulfide: Na₂S

First, find the molar masses of the individual elements in the compound: sodium (Na) and sulfur (S).

There are 2 atoms of sodium, denoted by the subscript after Na. Multiply the molar mass of sodium by 2 and add sulfur's molar mass.

This number tells us the grams of sodium sulfide in 1 mole.

2. Calculate Grams

Use the number as a ratio.

\(\frac{78.0495386 \ g \ Na_2S}{1 \ mol \ Na_2S}\)

Multiply by the given number of moles, 3.46.

\(3.46 \ mol \ Na_2S *\frac{78.0495386 \ g \ Na_2S}{1 \ mol \ Na_2S}\)

The moles of sodium sulfide will cancel.

\(3.46 *\frac{78.0495386 \ g \ Na_2S}{1 }\)

\(3.46 *{78.0495386 \ g \ Na_2S}\)

\(270.051404 \ g \ Na_2 S\)

3. Round

The original measurement of grams, 3.46, has 3 significant figures. We must round our answer to 3 sig figs.

For the answer we calculated, that is the ones place.

The 0 in the tenth place tells us to leave the 0 in the ones place.

\(\approx 270 \ g \ Na_2 S\)

There are about 270 grams of sodium sulfide in 3.46 moles.

Answer:

Mass = 269.8 g

Explanation:

Given data:

Number of moles of Na₂S = 3.46 mol

Mass of Na₂S = ?

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of Na₂S = 78.0 g/mol

Mass = 3.46 mol × 78.0 g/mol

Mass = 269.8 g

Esterification is the process that turned salicylic acid and acetic acid into acetylsalicylic acid.

Thus,  The process of creating esters from carboxylic acids is known as esterification. When a carbon is linked to two oxygen atoms, an ester results from one of the oxygens being double-bonded to the carbon while the other oxygen is linked to another carbon.

The letter "R" stands for a carbon chain in the following generic formula for an ester.

Esterification occurs when a carboxylic acid reacts with an alcohol. This reaction can only occur in the presence of an acid catalyst and heat. It takes a lot of energy to remove the -OH from the carboxylic acid, so a catalyst and heat are needed to produce the necessary energy.

Thus, Esterification is the process that turned salicylic acid and acetic acid into acetylsalicylic acid.

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The partial pressure of nitrogen on Venus is approximately 321.914 kPa.

To find the partial pressure of nitrogen on Venus, we need to calculate the partial pressure using the mole fraction of nitrogen and the total atmospheric pressure. First, we convert the total atmospheric pressure from psi to kilopascals (kPa) since the mole fraction is given in terms of kPa.

1 psi = 6.89476 kPa

Therefore, the total atmospheric pressure on Venus is:

1334 psi × 6.89476 kPa/psi = 9197.53 kPa

Next, we can calculate the partial pressure of nitrogen using the mole fraction. The mole fraction of nitrogen is given as 0.035, which means that nitrogen makes up 3.5% of the total moles of gas in the atmosphere.

The partial pressure of nitrogen is given by:

Partial pressure of nitrogen = Mole fraction of nitrogen × Total atmospheric pressure

Partial pressure of nitrogen = 0.035 × 9197.53 kPa

Partial pressure of nitrogen = 321.914 kPa

Therefore, the partial pressure of nitrogen on Venus is approximately 321.914 kPa.

It's important to note that the given atmospheric composition of Venus's atmosphere and the total atmospheric pressure are approximate values and can vary depending on specific conditions and measurements.

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The primary difficulties in creating a low-cost, portable water purification system include assuring efficient pollution removal, compact design, durability etc.

In order to create a low-cost, portable water purification system, engineers must overcome several main obstacles and challenges, including: ensuring the removal of contaminants effectively; designing a compact and lightweight system; guaranteeing durability and reliability in harsh environments; providing an affordable, sustainable power source; and addressing cultural and social factors that may affect user acceptance and adoption.

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Answer:

uR making us work hard for this and yet all u give is 5 points

First he is not locking properly up

Answer: 0.983 moles of carbon dioxide are present

Explanation:

To determine the number of moles of carbon dioxide (CO₂) present when there are 11.8 x 10²³ atoms of oxygen, we need to consider the molecular formula of carbon dioxide.

The molecular formula of carbon dioxide (CO₂) indicates that there is one carbon atom and two oxygen atoms in each molecule of carbon dioxide.

Given that there are 11.8 x 10²³ atoms of oxygen, we can divide this number by 2 to determine the number of carbon dioxide molecules present, since each molecule of carbon dioxide contains two oxygen atoms.

Number of carbon dioxide molecules = \(\frac{11.8 X 10^2^3 atoms of oxygen }{2}\)

Next, we can use Avogadro's number, which states that there are approximately 6.022 x 10²³molecules per mole, to convert the number of carbon dioxide molecules to moles.

Number of moles of carbon dioxide = (11.8 x 10²³ atoms of oxygen / 2) / (6.022 x 10^23 molecules per mole)

Evaluating this expression, we get:

Number of moles of carbon dioxide = 0.983 moles

The given question is incomplete. The complete question is:

A chemist prepares a solution of mercury(I) chloride \(Hg_2Cl_2\) by weighing out 0.537 mg of mercury(I) chloride into a 400. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in g/dL of the chemist's mercury(I) chloride solution. Round your answer to 3 significant digits

Answer: The concentration in g/dL of the chemist's mercury(I) chloride solution is \(1.34\times 10^{-4}\)

Explanation:

Concentration of a solution is defined as how many grams of solute in=s dissolved in a particular amount of solvent.

Given :  mass of mercury (I) chloride = 0.537 mg = \(5.37\times 10^{-4}g\)      \((1mg=0.001g)\)

Volume of solution = 400 ml = 4 dL     (1ml=0.01dL)

Thus concentration of mercury (I) chloride in g/dL is = \(\frac{5.37\times 10^{-4}g}{4dL}=1.34\times 10^{-4}g/dL\)

The concentration in g/dL of the chemist's mercury(I) chloride solution is \(1.34\times 10^{-4}\)

Answer:

baking soda - sodium hydrogen carbonate

bleach (liquid) - sodium hypochlorite

bleach (solid)- sodium hypochlorite

borax- sodium tetraborate decahydrate

brimstone- magnesium sulfate heptahydrate (sulfur)

cream of tartar- potassium hydrogen tartrate

Epsom salt- magnesium sulfate

Freon- Dichlorodifluoromethane

galena- gray lead sulfide

grain alcohol- ethanol

graphite- carbon silicon family

gypsum- calcium sulfate

hypo- sodium thiosulfate

laughing gas- nitrous oxide

lime- calcium hydroxide

limestone- calcium hydroxide

lye- sodium hydroxide

(i'll finish the rest later)

Explanation:

The statement correct about about the pure substance is option 3. It cannot be physically broken down into different types of molecules.

Pure substance are substance with a definite proportion of its constituent atoms or molecules which cannot be physically separated and does not contain any impurities.

For example,  water, fruit pulp, gaseous elements, metals, salt crystals etc. They contains only one type of molecules and are not mixtures of different type of molecules.

Therefore, pure substances cannot be physically broken down into different types of atoms. Hence, option 3  is correct.

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