Conductivity level probes can only be used with conductive liquids.

a. True
b. False

Answer:

A hydrogen bond is the electromagnetic attraction created between a partially positively charged hydrogen atom attached to a highly electronegative atom and another nearby electronegative atom. A hydrogen bond is a type of dipole-dipole interaction; it is not a true chemical bond.

Explanation:

The cell notation for the given electrochemical cell can be represented as follows: Pt | Cr2 (aq) || H+ (aq) | Pt . In this notation, the left-hand side represents the anode compartment where Cr2 (aq) is oxidized to Cr3 (aq) at a platinum electrode.

The single vertical line represents the phase boundary between the two half-cells. The right-hand side represents the cathode compartment where H+ (aq) is reduced to H2(g) at a platinum electrode.

It is important to note that the cell notation also includes the standard conditions for concentration and pressure. In this case, the aqueous solutions have a concentration of 1 mol/l and the gases have a pressure of 1 bar. These conditions are usually mentioned to ensure the standardization and comparability of electrochemical cell measurements.

Furthermore, the cell notation also provides information on the direction of the electron flow, which is from the anode to the cathode. The pressure and concentration values can also affect the direction and magnitude of the cell potential and can impact the overall performance of the electrochemical cell.

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example: Acetic acid

example: sodium bicarbonate

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Answer:

c. Excess fertilizers run off into rivers and create a dead zone.

Explanation:

One very clear cut example of how the same chemicals used to help people can harm the environment is shows is through the excess fertilizers that run off into rivers and create a dead zone.

Asparagine is the amino acid most likely to form a hydrogen bond with water (Asn).

The side chain of asparagine has an amide functional group (-CONH-), which can serve as both a hydrogen bond donor and acceptor. As a result, asparagine is more hydrophilic (loves water) than the other amino acids listed because it may interact with water molecules via hydrogen bonding. The amino acids valine (Val), leucine (Leu), and phenylalanine (Phe) are hydrophobic (averse to water) because they lack functional groups on their side chains that can form hydrogen bonds with water. The side chain of the amino acid alanine (Ala) has a methyl functional group (-CH3) that is hydrophobic and does not engage in hydrogen bonding. As a result, asparagine is the amino acid that has the highest likelihood of forming a hydrogen bond with water.

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Answer:

Explanation:

The volume of Hydrogen and Oxygen molecules are not the same but assuming that they are, the ratio in water which is H2O would be

(c) 2:1

Answer:

It is not a legitimate chemical name because the methyl group on carbon 1 increases the length of the carbon chain to seven carbon atoms thus making the parent compound heptane

Explanation:

Chemical compounds are named according to rules in the IUPAC nomenclature.

In naming organic compounds, parts of rules is to find out the parent or root compound. This is determined by finding out the longest carbon chain and then checking if it contains single or multiple bonds.  (that is if it is an alkane- with single bonds, alkene-with double bonds or an alkyne- with triple bonds)

From the question the parent or root name is an alkane containing 6 (Hex-) carbon atoms, while the methyl group is  substituent

(CH₃)-CH₂-CH₂-CH₂-CH₂-CH-CH₃

However the alkyl substituent on carbon 1 increases the the length of the carbon chain to 7 (Hept-) instead of 6. Hence the correct IUPAC nomenclature is heptane and not 1-methylhexane.

Answer:

1

Explanation:

Because it only separated while everything else turned into different materials.

To establish a metal block's specific heat capacity. Verify that the power supply has been switched off.

To establish a metal block's specific heat capacity. Verify that the power supply has been switched off. Insert the immersion heater through the block's top-center hole. To ensure that the thermometer is enclosed by an excellent conducting medium, insert the thermometer through the smaller hole then add a few drops of oil to the hole. To establish a metal block's specific heat capacity. Verify that the power supply has been switched off.

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The given reaction N2 (g) + 3H2 (g) à 2NH3 (g) is an example of combination reaction.

As a result, it is a combination reaction.

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The molecular formula for the substance with a molar mass of 1644.28 g/mol and an empirical formula of Bg₂DGr₃ is Bg₁₀D₅Gr₁₅.

To determine the molecular formula, we need to calculate the molecular weight of the empirical formula, which can be done by adding up the molar masses of the atoms in the empirical formula.

The molar mass of Bg₂DGr₃ is:

(2 x 10.81 g/mol) + (3 x 2.01 g/mol) + (3 x 72.63 g/mol) = 328.50 g/mol

Next, we can divide the given molar mass by the empirical formula mass to get the ratio between the empirical formula and the molecular formula:

1644.28 g/mol ÷ 328.50 g/mol = 5

This tells us that the molecular formula contains 5 times as many atoms as the empirical formula. To find the molecular formula, we simply multiply the subscripts in the empirical formula by 5:

Bg₁₀D₅Gr₁₅

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Answer:

Preparation and Standardization of 0.1 M Ferrous Ammonium...

Dissolve 40 g of ferrous ammonium sulfate in a previously cooled mixture of 40 ml of sulphuric acid and 200 ml of water.

Dilute with sufficient freshly boiled and cooled water to produce 1000 ml.

Standardize the solution in the following manner.

Explanation:

Answer:

A. 21 J

Explanation:

Your temperature change is 10 degrees Celsius, or 10 Kelvin, it makes no difference either way.

Cp = 2.06 J/g•K

Multiply by the temperature change to just get J/g

2.06 J/g•K • 10 K = 20.6 J/g ≈ 21 J/g

21 J is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K) which is heated from 25°C to 15°C. So, the correct option is A.

Heat is defined as the energy that is transferred from one body to another as a result of a difference in temperature, when two bodies at different temperatures are brought together, the energy transferred is that of the hotter body which flows towards the colder body.

In this case, according to the equation for the calculation of the heat during a heating process

\(Q= mC (T_f- T_i)\)

It is possible to calculate mass per gram of ice by dividing both sides by removing m from the equation, we plug in the given specific heat and final and initial temperatures to get:

\(Q= 2.06 \frac{J}{g degree C} [-15 Degree C- (-25 Degree C]\)

\(Q= 20.6\frac{J}{g}\) which is equals to 21° C

21 J is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K) which is heated from 25°C to 15°C.

Therefore, the correct option is A.

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The pH of the solution with [H₃O+] = 1.8 x 10⁻⁵ M is 4.74, therefore this substance is acid.

pH is a measure of the acidity or basicity of a solution and is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in a solution.

A substance is considered acidic if it has a pH value less than 7, which means it has a higher concentration of H+ ions than OH- ions. On the other hand, a substance is considered basic if it has a pH value greater than 7, which means it has a higher concentration of OH- ions than H+ ions. If a substance has a pH value of 7, it is considered neutral, indicating that the concentration of H+ ions and OH- ions are equal.

The pH of the solution with [H₃O+] = 1.8 x 10⁻⁵ M is calculated by taking the negative log of the concentration of H₃O+. Thus:

pH = -log(1.8 x 10⁻⁵) = 4.74. This pH value indicates that the solution is slightly acidic.

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A balloon contains 5.30mL of gas when the temperature is 12°C.13.58°C will the temperature of the container be when the volume increases to 6.00ml if the pressure remains constant.

Gas laws, which link a gas's volume, pressure, and temperature. According to Boyle's law, which bears Robert Boyle's name, a gas's pressure P changes inversely with its volume V at constant temperature, or PV = k, where k is a constant.

Given:

V₁ = 5.30ml

V₂ = 6.00ml

T₁ = 12⁰C

T₂ = ?

Pressure is constant then formula become as follows:

V₁/T₁ = V₂/T₂

V₁ × T₂ = V₂ × T₁

By substituting given values in above equation and we get,

5.30 × T₂ = 6.00 × 12

T₂ = 6.00 × 12 / 5.30

T₂ = 13.58°C

Thus, 13.58°C will the temperature of the container be when the volume increases to 6.00ml.

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Answer: The number of moles of gas which are present in the sample are 1.49 mol.

Explanation:

Given: Volume = 55.3 L

Temperature = \(23.3^{o}C\) = (23.3 + 273) K = 296.3 K

Pressure = 0.658 atm

Formula used is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(PV = nRT\\0.658 atm \times 55.3 L = n \times 0.0821 L atm/mol K \times 296.3 K\\n = \frac{0.658 atm \times 55.3 L}{0.0821 L atm/mol K \times 296.3 K}\\= \frac{36.3874}{24.32623}\\= 1.49 mol\)

Thus, we can conclude that the number of moles of gas which are present in the sample are 1.49 mol.

Answer:

Here is ur answer...

Explanation:

2) Half-filled d orbital increases the stability of the element.

Answer:

C. N₂O₄ → N₂ + 2O₂

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define

N₂O₄ decomposes into N₂ and O₂

Step 2: RxN

Unbalanced RxN:   N₂O₄ → N₂ + O₂

Balanced RxN:   N₂O₄ → N₂ + 2O₂

Answer:

Atom Labeling

Explanation:

Y- neutron

Z-protron

X - electron

W- nucleus

The bond that exists between two oxygen atoms to make the O2 molecule is described as two covalent bonds and two lone pairs of electrons are present on each individual oxygen atom.

A double bond in chemistry is a covalent bond between two atoms that involves four bonding electrons, rather than two as in a single bond.

In the oxygen molecule, O2, the oxygen atoms that make up the molecule are bonded together by sharing two pairs of electrons. Each oxygen atom has 6 valence electrons, if they share two of their valence electrons with each other, they each have 8 valence electrons.

In this way, the so-called octet rule is fulfilled, where atoms gain, lose or share electrons with other atoms to have 8 valence electrons and thus acquire a noble gas configuration.

The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.

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Statement 4th describes the charge of an electron and the charge of a proton.

An electron has a charge of -1, and a proton has a charge of +1. This means that electrons have a negative charge while protons have a positive charge. These charges are equal in magnitude but opposite in sign, meaning that they attract each other. This attraction is what keeps electrons orbiting around the nucleus of an atom which is made up of protons and neutrons.

Statement 1 and 2 are incorrect because both electrons and protons cannot have the same charge. The correct answer is statement 4 which describes the opposite charges of electrons and protons. This difference in charges is what allows for the formation of chemical bonds and the interactions between atoms in a variety of chemical reactions. The understanding of these charges and their interactions is fundamental to the study of chemistry and physics.

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Answer:

because it does not cost much and can be found easily.  due to their low resistance and excellent conductivity.

Explanation:

200 mL of a 12.0% (m/v) NaCl solution is diluted to 600 mL.

Here Initial concentratioon (C₁) = 12%

Final concentration (C2) =?

Initial volume (V₁) = 250 mL

Final volume (V2) = 600 mL

The Formula is

C1 × V1 = C2 × V2

C2 = ( C1 × V1 ) / V2

C2 = (12% × 250ml) / 600 ml

= 5%

Hence, the new concentration is 5% (m/v)

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The given statement ," Greenhouse gases affect the temperature of the earth by blocking sunlight from reaching the earth" is true.

Generally the greenhouse effect is defined as a process that occurs when gases in Earth's atmosphere usually trap the Sun's heat. The process of greenhouse gases makes Earth much warmer than it would be without an atmosphere. Basically greenhouse effect is one of the things that makes our Earth a comfortable place to live.

Generally greenhouse gases are also known as GHGs are gases in the earth's atmosphere that trap heat. Basically, during the day time, the sun shines through the atmosphere, warming the earth's surface. During the night time the earth's surface cools, releasing heat back into the air.

Hence, the given statement is true.

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In the given reaction, the number of oxygen atoms present in the reactants of the reaction 4P+5O₂→P₄O₁₀ is 10.

The number of atoms present in a diatomic molecule is 2 i.e. it is the number of the subscript written in the formula. If we have more than one molecule, then the number of atoms are calculated by doing the multiplication of coefficient and the number of subscript in the formula. Since, 1 molecule of oxygen contains 2 atoms. Therefore, the number of oxygen atom present in 5 molecule of O₂ is

Number of oxygen atom=(5×2)=10

Hence, the number of oxygen atoms present in the equation is 10. Therefore, fourth option is correct.

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Answer:

The mass number (A) of an atom is the total number of protons and neutrons in its nucleus. ... Because electrons have virtually no mass, just about all the mass of an atom is in its protons and neutrons. Therefore, the total number of protons and neutrons in an atom determines its mass in atomic mass units (Table 4.5. 1).

Answer:

gas is composed to particles and has a mass.

The charge on the potassium ion is 1+. So, Option A is the correct answer from the given options.

We must ascertain the charge carried by the potassium ion.

Being a group 1 element, potassium will produce an ion with a positive charge.

Since potassium achieves an extremely stable noble gas electrical structure after losing one electron, this element possesses a steady +1 valency.

As a result, the potassium ion has a 1+ charge. The right response from the available alternatives is thus Option A.

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