Which one is correct

Answer:

LiHCO3 its PH >7

Explanation:

the real ph for it is 11.3 so it makes it more than 7

and if you know it is a conjugate base coming from the weak acid H2CO3 so LiHCO3 is a base

Answer:

3.38  Tablespoons

10.14 Teaspoons

0.21 U.S. Cups

0.18 Imperial Cups

0.20 Metric Cups

50.00 Milliliters

Explanation:

Answer:

Percentage by mass of oxygen = 76.20% (Approx)

Explanation:

Given:

HNO3

H=1, N=14, O=16]

Find:

Percentage by mass of oxygen

Computation:

HNO3

Total mass = 1 + 14 + 3(16)

Total mass = 63

Mass of oxygen = (3)(16) = 48

Percentage by mass of oxygen = [48/63]100

Percentage by mass of oxygen = 76.20% (Approx)

Answer:

true

no explanation

Answer:.

Explanation:

The molar concentration of ethanol in the wine is 2.82 M.

To determine the molar concentration of ethanol in wine, we need to convert the mass percentage of ethanol to molar concentration.

Given:

Mass percentage of ethanol = 14% (by mass)

Density of wine = 0.93 g/cm^3

First, we need to calculate the mass of ethanol in the wine. Assuming we have 100 grams of wine, the mass of ethanol is:

Mass of ethanol = 14% of 100 g = 14 g

Next, we need to convert the mass of ethanol to moles. The molar mass of ethanol (C2H5OH) is approximately 46.07 g/mol.

Moles of ethanol = Mass of ethanol / Molar mass of ethanol

Moles of ethanol = 14 g / 46.07 g/mol

Moles of ethanol ≈ 0.3032 mol

Finally, we need to calculate the molar concentration of ethanol in terms of moles per liter (Molarity). Since we know the density of the wine, we can use it to convert from volume (L) to mass (g).

Volume of wine = Mass of wine / Density of wine

Volume of wine = 100 g / 0.93 g/cm^3

Volume of wine ≈ 107.53 cm^3 ≈ 0.10753 L

Molar concentration of ethanol = Moles of ethanol / Volume of wine

Molar concentration of ethanol = 0.3032 mol / 0.10753 L

Molar concentration of ethanol ≈ 2.82 M

Therefore, the molar concentration of ethanol in the wine is approximately 2.82 M.

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When sodium chloride is added to 100 grams of water in a styrofoam cup and the temperature decreases from 25°C to 24°C while stirring with a thermometer, the thermodynamics of dissolving NaCl in water can be said to be endothermic.

Explanation: Thermodynamics is the science that studies the connection between heat, work, and energy. A study of energy transformation in various processes, including chemical reactions, phase transitions, and changes in temperature and pressure, is included in thermodynamics.

When sodium chloride is dissolved in water, an endothermic reaction occurs, meaning that the surroundings absorb heat. Heat is absorbed by the surroundings during an endothermic reaction, resulting in a decrease in temperature in the reaction vessel.

When NaCl is dissolved in water, the same thing happens. Heat is absorbed from the surroundings to dissolve the salt, resulting in a decrease in temperature. As a result, the thermodynamics of dissolving NaCl in water is endothermic.

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Answer:

by the looks of it the answer you have is correct

Explanation:

Answer:

The answer B

.

Explanation:

Answer:

90.71 KJ

Explanation:

From the reaction equation, lead is the cathode while copper was the anode.

Hence;

E°anode = +0.34V

E°cathode = -0.13 V

E°cell =E°cathode - E°anode

E°cell = -0.13 V - 0.34V

E°cell = -0.47 V

But;

ΔG° = -nFE°cell

n= number of electrons transferred = 2

F = Faraday's constant = 96500 C

E°cell = -0.47 V

ΔG° = -(2 * 96500 * (-0.47))

ΔG° = 90,710 J or 90.71 KJ

The standard Gibbs free energy for the reaction

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq) is 89.3 kJ/mol.

Let's consider the following redox reaction.

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq)

We can identify both half-reactions.

Reduction (Cathode): Pb²⁺(aq) + 2 e⁻ → Pb(s)    E°red = -0.126 V

Oxidation (Anode): Cu(s) → Cu²⁺(aq) + 2 e⁻       E°red = +0.337 V

We can calculate the standard potential of the cell (E°cell) using the following expression.

E°cell = E°red,cathode - E°red,anode = -0.126 V - 0.337 V = -0.463 V

The standard Gibbs free energy (ΔG°) is a way to measure the spontaneity of a reaction. We can calculate it using the following expression.

ΔG° = − n × F × E°cell =

ΔG° = − 2 mol × (96,485 J/V.mol) × (-0.463 V) × (1 kJ/1000 J) = 89.3 kJ/mol

where,

Since ΔG° > 0, the reaction is not spontaneous.

The standard Gibbs free energy for the reaction

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq) is 89.3 kJ/mol.

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The temperature at which the volume of the gas would be 0.550 L is approximately 465.56 K.

Based on the available answer choices, the closest option is A. 464 K.

To determine the temperature at which the volume of a gas would be 0.550 L, we can use the combined gas law, which relates the initial and final volumes and temperatures of a gas sample. The combined gas law formula is as follows:

(P₁V₁)/(T₁) = (P₂V₂)/(T₂)

Where:

P₁ and P₂ are the initial and final pressures of the gas (assumed constant),

V₁ and V₂ are the initial and final volumes of the gas,

T₁ and T₂ are the initial and final temperatures of the gas.

Using the given values:

V₁ = 0.312 L

V₂ = 0.550 L

T₁ = -10.0 oC

First, let's convert the initial temperature from Celsius to Kelvin:

T₁ = -10.0 + 273.15 = 263.15 K

Now, we can rearrange the combined gas law formula to solve for T₂:

T₂ = (P₂V₂ * T₁) / (P₁V₁)

Since we don't have any information about the pressures of the gas, we can assume they remain constant, which means P₁ = P₂. Therefore, the equation simplifies to:

T₂ = (V₂ * T₁) / V₁

Plugging in the given values:

T₂ = (0.550 * 263.15) / 0.312 ≈ 465.56 K

Therefore, the temperature at which the volume of the gas would be 0.550 L is approximately 465.56 K.

Based on the available answer choices, the closest option is A. 464 K.

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The correct options are:

What is a second resonance structure?

A second resonance structure refers to an alternative depiction of a molecule or an ion that can be drawn to represent the electron distribution when there are multiple possible ways to arrange the electrons within the molecule. These resonance structures typically involve the movement of pi bonds, lone pairs of electrons, or formal charges within the molecule while maintaining the overall connectivity of the atoms.

Based on the options provided, the following structures can have a second resonance structure:

1.A positively charged atom with an empty p orbital is located attached to an atom with a lone pair and a multiple bond.

2.A lone pair or a positive charge is located on a carbon atom.

3.A lone pair is located on an atom directly attached to (adjacent to) a multiple bond.

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The strong acid and strong base has high rate constant of dissociation. The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, no, acid would not remain acid  if the positions of electrons and protons were swapped.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. Temperature affect the pH. At room temperature pH scale is between 0 to 14. 7 is the pH of neutral solution. No, acid would not remain acid  if the positions of electrons and protons were swapped.

Therefore, no, acid would not remain acid  if the positions of electrons and protons were swapped.

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A construction worker spilled a bag of powdered chemical, covering both of his arms . he complains of intense pain ,then in that case , the patient who was exposed to a powdered chemical , it is important to brush the chemical from the skin first ,then irrigate the site with copious ( abundant ,extensive in quantity ) amount of water .

Due to the cleaning of chemical from the hand , it minimize the risk to the hand by removing the extra amount of chemical from the surface and helps in rapid cure .

chemical exposure to the skin can cause temporary or permanent health damage .temporary skin damage may occur from exposure to chemicals. for example ,many workers may experience dry ,red ,cracked skin from contact with water ,soaps ,gasoline and certain types of solvents .

Permanent skin damage may occurs if the skin is exposed to a chemical that is known to have a severe impact . exposure to certain chemicals can results permanent loss of skin color .permanent damage may occurs to certain organs also like exposure to certain solvents may results in the permanent loss of skin color .

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The crash where the cone experience a stronger force is option D because: Crash 1: the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

The ball is drawn back to Earth by gravitational force. The ball returns to Earth as a result of friction. The ball is forced back toward Earth by magnetic force.

A puck's velocity changes when a player makes contact with it when it is still. He causes the puck to speed up, in other terms. The hockey stick's force, which causes the acceleration, is responsible. The velocity grows as long as this force is in motion.

Therefore, the force applied to an object must be larger than what is required for a progressive slowing down if the object must be slowed down quickly. For instance, a bicycle's brakes will slow or stop it more quickly the more force is given to it.

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See full question below

After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone.

Use the information from the diagram to answer.

In which crash did the cone experience a stronger force? How do you know?

answer choices

There was no force on the cone. In both crashes, only the hockey puck experienced a force.

The diagram doesn’t tell you anything about the force on the cone. It only gives information about the force on the pucks.

It was the same force in both crashes; the hockey puck changed speed by the same amount in each crash, so the force on the cone was the same each time.

Crash 1; the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

Answer:

2.coefficient how many molecules of Aluminum hydroxide there are

There is 1.0 mole of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution.

To determine the number of moles of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution, we need to use the equation:

moles = concentration (M) × volume (L)

Since 1 liter is equal to 1000 milliliters, we divide 500.0 mL by 1000 to get 0.5 L.

Next, we substitute the values into the equation:

moles = 2.0 M × 0.5 L

The concentration of 2.0 M indicates that there are 2.0 moles of KNO₃ in 1 liter of the solution. Therefore, multiplying the concentration (2.0 M) by the volume (0.5 L) gives us the number of moles of KNO₃:

moles = 2.0 M × 0.5 L = 1.0 mol

Hence, there is 1.0 mole of KNO3 in 500.0 mL of a 2.0 M KNO₃ solution.

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Answer:

no. of moles = measured mass of substance/ molar mass of the constituted elements

Explanation:

No. of moles of 2.0g NaCl= 2/(23+35.5) = 0.034mol

Copper sulphate (CuSO4) has a molar mass of 159.6 g/mol.

What uses does copper have?

Due to its ductility and excellent conductivity, copper is mostly used in electrical generators, home and auto wiring, as well as the wires in electronics like radios, TVs, computers, lighting, and motors.

A metal or a nonmetal, is copper?

Just on Periodic Table of Elements, copper is the 29th element. It is regarded as a moderately, nonferrous, malleable metals with countless uses in the fields of electrical and electronics, plumbing, construction projects & architecture, business, transportation, & consumer and health items.

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Explanation:

When we consider the Standard Temperature and Pressure (STP), where the pressure is equal to 1 atm and the temperature is 273 K (0ºC), we have that the volume occupied by 1 mol of any gas will always be 22.4 L. This value corresponds to the molar volume of the gases.

22.4 L is equal to 22400 mL.

Answer: 22400 ml

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{7.15 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 11.87707641...\)

We have the final answer as

Hope this helps you

The expression 78.3 kJ in the thermochemical equation represents the amount of heat energy released or absorbed during the reaction.

The expression 78.3 kJ in the thermochemical equation signifies the amount of heat energy released or absorbed during the reaction. In this case, the positive value of 78.3 kJ indicates that the reaction is exothermic, meaning that heat energy is released as a product of the reaction.

This means that the reaction releases 78.3 kJ of heat energy for every mole of product formed, and this energy can be measured experimentally using calorimetry techniques. The units of energy, in this case, are kilojoules (kJ), which is a standard unit of energy in the International System of Units (SI).

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--The complete question is, Here is a generic thermochemical equation involving reactants a and b and products c and d,  a + 2b ----> 2c + d; 78.3 kJ. What does the expression 78.3 kJ signify?--

Answer:

Explanation:

A ) Solar Radiation

B ) Evaporation

C ) Transpiration

D ) Condensation

E ) Precipitation

F ) Run Off

G ) Infiltration

H ) Groundwater .

[Fe(CN)₆]⁴⁻ ion has one unpaired electron with d₆ electronic configuration.

We must take into account the electronic structure of the Fe3+ ion, which has five 3d electrons and no 4s electrons, in order to calculate the number of unpaired electrons in the [Fe(CN)₆]⁴⁻ ion. CN- ligands donate two electrons to form a coordinate covalent bond with Fe³⁺ when they coordinate with the metal ion. Each CN- ligand consequently takes up one of the six coordination sites surrounding Fe³⁺.

The [Fe(CN)₆]⁴⁻ ion has a d₆ electronic configuration, meaning that electrons occupy each of its six d orbitals. When degenerate orbitals are available, electrons first occupy them alone before pairing up, according to Hund's rule. As a result, given that there are six electrons in the d orbitals, we can anticipate that at least one of them will be unoccupied, leading to one unpaired electron.

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Balanced net ionic equation for a neutralization reaction that results in the formation of sodium fluoride is Na+ + F- → NaF

A neutralization reaction is a chemical reaction that occurs when an acid and a base react to form a salt and water. This type of reaction is exothermic, meaning that it releases energy in the form of heat. During a neutralization reaction, hydrogen ions from the acid are neutralized by the hydroxide ions from the base. The byproduct of this reaction is a salt and water. The salt produced depends on the acid and base used in the reaction, and the pH of the solution is neutralized to 7.0.

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Answer:

1.26666.....

Explanation:

Density is = to mass/volume

Answer: 19/15 in decimal form 1.267

Explanation:

when solving for density you divide mass by volume, when solving vor volume divide density and mass, finding mass multiply density and volume

The chemist is likely planning a solid-phase oligosaccharide synthesis experiment.

Solid-phase oligosaccharide synthesis involves the stepwise assembly of carbohydrate chains on a solid support using blocking groups and activating groups. The blocking groups protect specific functional groups to ensure selective reactions, while the activating groups enhance the reactivity of certain functional groups during the synthesis process. This method allows for the controlled and sequential addition of monosaccharide units to build up complex oligosaccharide structures. The resulting oligosaccharides can then be analyzed using various techniques such as nuclear magnetic resonance (NMR) analysis, liquid chromatography mass spectrometry/mass spectrometry (LC-MS/MS) analysis, or other analytical methods to characterize their structure and properties.

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Answer:

No. Two atoms of the same chemical element are typically not identical. Since the states of the electrons in an atom are what determine the nature of the chemical bonding that the atom experiences, two atoms of the same element can react differently if they are in different states.

Answer: No

Explanation: Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.