how much heat energy is required to bring pure liquid water from 0 degrees celsius to liquid water at 50 degrees celsius? the mass of water is 500g

Answer:

pH = 6.20

Explanation:

The pKa of cacodylic acid is 6.

To solve this question we must use Henderson-Hasselbalch equation:

pH = pKa +log [A⁻] / [HA]

Where pKa is the pKa of the weak acid = 6

And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.

The moles of the NaOH added to the solution of the weak acid are = Moles A⁻

And moles HA = Initial moles HA - Moles NaOH added

Initial moles HA:

0.0200L * (0.130mol / L) = 0.00260 moles

Moles NaOH:

0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]

Moles HA =

0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]

pH = 6 +log [0.00160 moles] / [0.00100 moles]

The pH of the resulting solution is 1.6.

Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;

HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)

Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles

Number of moles of HA = 20.0/1000  × 0.130 = 0.0026 moles

We can see that the HA is in excess, Number of moles of excess acid =

0.0026 - 0.0016 = 0.001 moles

Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L

Molarity of excess acid =  0.001 moles/0.004 L = 0.025 M

pH = -log[H^+]

pH = -log[0.025 M]

pH = 1.6

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Answer:

A). half, higher

Explanation:

The Formal charge is elaborated as the 'allocated charge to a molecules' atom' on the basis of the assumption that the electrons present in the chemical bond are equally split among the atoms. It is estimated by 'halving the no. of bonding electrons that encircle the atom.

While Oxidation number is characterized as the 'hypothetical charge of an atom that is present within a molecule.' It is also defined as 'the actual number of lost or gained electrons or the rate at which the electrons are gained or lost by an atom to develop a chemical bond along with the other atom.' It is calculated by allocating or sharing the electrons having the higher electronegativity belonging to a specific bond with the other. Thus, option A is the correct answer.

An isotope is (a) an atom that has more or fewer neutrons than it typically does.

Most elements have more than one naturally occurring isotope, and each isotope has a unique number of neutrons in its nucleus. Isotopes are identified by their atomic number, which represents the number of protons in the nucleus, and their mass number, which represents the sum of protons and neutrons in the nucleus.

The different isotopes of an element have similar chemical properties but may have slightly different physical properties. For example, some isotopes of carbon are radioactive and decay over time, while others are stable and do not decay. Isotopes are important in a variety of scientific fields, including medicine, geology, and archaeology, where they can be used for dating fossils and other materials.

Understanding isotopes is crucial in many areas of science and can provide valuable insights into the natural world.

Therefore, the correct option is (a).

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Answer:

The oxygen we breathe is not in atomic form. It is in its molecular form, which is two oxygen atoms joined together by bonds, and between its two atoms, this molecule has 16 protons, 16 electrons, and most commonly 16 neutrons. Answer 5: An oxygen atom contains eight protons.

Answer:

The sun, like all stars, is able to create energy because it is essentially a massive fusion reaction. Technically known as nuclear fusion, this process releases an incredible amount of energy in the form of light and heat.

Types of energy produced: Stars produce energy from nuclear reactions, primarily the fusion of hydrogen to form helium.

Explanation:

hope this helped :D

The volume of HCl gas required to prepare 11.6 moles/liter of concentrated hydrochloric acid is 26.99 litres.

The volume of hydrochloric acid (HCl) gas required to prepare a certain concentration of hydrochloric acid,calculate the moles of HCl required.

The concentration of hydrochloric acid is given as 11.6 moles/liter.

Therefore, for a given volume of the solution, we can calculate the number of moles of HCl required by multiplying the volume of the solution (V) by 11.6 moles/liter.

Using the Ideal Gas Law, we can calculate the volume of HCl gas (Vg) required to produce the desired concentration of HCl:

Vg = (nRT) / P

Where:

n = number of moles of HCl (calculated above)

R = gas constant (0.0821 L atm/mol K)

T = temperature (25 °C = 298 K)

P = pressure (1 atm)

Therefore, the volume of HCl gas required to prepare 11.6 moles/liter of concentrated hydrochloric acid is:

Vg = (11.6 * 0.0821 * 298) / 1 = 26.99 liters

In conclusion, to prepare a concentrated hydrochloric acid solution of 11.6 moles/liter at 25 °C and 1 atm pressure, you need to dissolve 26.99 liters of HCl gas in water.

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The correct option is option B, camouflage the chameleon from predators.

Chameleons belong to the reptile family of the animal kingdom, they are creatures with their own special abilities i.e. they can change the color of their body to match them with the surrounding.

This ability of theirs is very helpful for them to hunt for prey as they can camouflage in the environment the prey doesn't get the chance to recognize them as their potential threat and thus they get attacked. Chameleons generally hunt small insects like butterflies, ants, etc.

Another and the most important use of this ability is to hide from the potential threats or predators of the wild. It helps them to blend in with their environment and avoid detection by predators. For example, if a chameleon is in a green plant, it can change its skin color to green and become nearly invisible to predators.

This adaptation allows the chameleon to survive in its environment by remaining undetected, which is essential for its survival.

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Answer:

1043

Explanation:

Convert 104.3 Centimeter to Millimeters (cm to mm) with our conversion calculator and conversion tables. To convert 104.3 cm to mm use direct conversion formula below.

104.3 cm = 1043 mm.

Answer:

1043

Explanation:

Multiply 104.3 by 10

The rate constant of the reaction is 0.018 M min-1.

In this given reaction, the reactants H₂(g) and Cl₂(g) combine to form the product HCl(g). The reaction follows zero-order kinetics when carried out using light. Zero-order kinetics means that the rate of the reaction is independent of the concentration of the reactants.

The rate law for a zero-order reaction can be expressed as:

rate = k

Where "rate" represents the rate of the reaction and "k" is the rate constant. In this case, the rate constant is given as 0.018 M min-1.

For zero-order reactions, the rate constant represents the rate of the reaction at a specific temperature. It indicates the amount of product formed per unit time when the concentrations of the reactants are kept constant.

The units of the rate constant, in this case, are M min-1, indicating that the concentration of the reactants is measured in moles per liter (M) and the time is measured in minutes.

The rate constant can vary with temperature, and different reactions may have different rate constants at different temperatures. However, in this question, the specific temperature is not provided, so we cannot determine its value.

Overall, the main answer is that the rate constant of the reaction is 0.018 M min-1, indicating that the reaction proceeds at a fixed rate regardless of the concentrations of the reactants.

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Answer:

The earth is made of chemical

Explanation:

Explanation:

because of the chemical made up with earth

Answer:

Hcl Answer

Explanation:

may be this helpful!

A suitable solvent to use for the mobile phase of a normal phase TLC is a nonpolar solvent, such as hexane or heptane.

In normal phase TLC (Thin-Layer Chromatography), the stationary phase is polar (usually a polar silica gel or alumina) and the mobile phase is nonpolar. The goal is to separate and analyze polar compounds based on their relative affinity to the stationary and mobile phases.

Since the stationary phase is polar, a nonpolar solvent is used as the mobile phase to ensure good separation and elution of the analytes. Nonpolar solvents like hexane or heptane are commonly employed in normal phase TLC as they have low polarity and do not strongly interact with the polar stationary phase. This allows the analytes to migrate and separate effectively based on their polarity.

Using a nonpolar solvent as the mobile phase ensures that the elution order of compounds is determined mainly by their polar interactions with the stationary phase, making it suitable for normal phase TLC.

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The enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) is 571.6 kJ.

The enthalpy of the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) can be calculated by summing the enthalpies of the individual reactions involved. The given information provides the enthalpy change for the decomposition of CaCO3 (s) and the combustion of C (s) to form CO2 (g). By combining these reactions, the enthalpy change for the overall reaction can be determined.

The given reactions are:

CaCO3 (s) -> CaO (s) + CO2 (g) (H = 178.1 kJ)

C (s, graphite) + O2 (g) -> CO2 (g) (H = -393.5 kJ)

To calculate the enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g), we need to subtract the enthalpy change of reaction 2 from the enthalpy change of reaction 1. Since the enthalpy change is an extensive property, we can subtract the enthalpies directly:

ΔH = H(reaction 1) - H(reaction 2)

= 178.1 kJ - (-393.5 kJ)

= 178.1 kJ + 393.5 kJ

= 571.6 kJ

Therefore, the enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) is 571.6 kJ.

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The oxidation number is also known as the oxidation state. It is defined as the number of electrons that an atom has either gained or lost.

Let's find the oxidation number for each atom in NH4Cl. Oxidation number for N atom. Nitrogen is an element of group 15. It has 5 valence electrons. In NH4Cl, nitrogen has a covalent bond with 4 hydrogen atoms. The electronegativity of hydrogen is less than that of nitrogen. It suggests that each hydrogen atom will donate an electron to the nitrogen atom.

Nitrogen, on the other hand, will be given five electrons by hydrogen atoms. So, the oxidation state of nitrogen = number of valence electrons - number of electrons gained = 5-4= +1Oxidation number for H atom Hydrogen atoms in NH4Cl have covalent bonds with nitrogen. Nitrogen will acquire an electron from hydrogen atoms.

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TLC means Thin Layer Chromatography. It is a method that can best be described as "Affinity-Based" used in the separation of compounds that are in a mixture.

Unreacted p-nitrobenzaldehyde is simply an organic aromatic compound that contains a nitro group para-substituted to an aldehyde. in this case, if it is unreacted, that means it is the same as before the chemical reation.

Note that the question is missing key information hence the general answer.

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The statement about an excretory system consisting of Malpighian tubules is false is:

a. Urine cannot be produced with a U/P of greater than 1.

This statement is false because Malpighian tubules are capable of producing urine with a U/P (urine-to-plasma) ratio greater than 1. The U/P ratio refers to the concentration of solutes in the urine relative to the concentration of solutes in the plasma (blood). Malpighian tubules actively transport nitrogenous waste and other solutes from the hemolymph (insect equivalent of blood) into the tubules, which ultimately leads to the production of urine with a higher concentration of waste products compared to the hemolymph.

The correct statements about an excretory system consisting of Malpighian tubules are:

b. Nitrogenous waste collected is deposited into the gut.

c. KCl is the major ion used in the process.

d. Such a system is found in insects.

e. Water and salts can be re-absorbed and returned to the hemolymph.

In this system, nitrogenous waste products, such as uric acid, are collected by the Malpighian tubules and deposited into the gut, where they can be eliminated from the insect's body. Potassium chloride (KCl) is an essential ion involved in the excretory process, as it plays a role in the transport of waste and water reabsorption. Malpighian tubules are a characteristic feature of the excretory system in insects, and they allow for the reabsorption of water and salts from the tubules back into the hemolymph to maintain proper fluid balance.

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The specific heat of the metal is approximately 0.169 J/g·°C.

To determine the specific heat of the metal, we can use the formula:

q = m * c * ΔT

where q is the heat energy absorbed by the metal, m is the mass of the metal, c is the specific heat of the metal, and ΔT is the change in temperature.

In this case, we have a mass of 25.0 g, a temperature change of 6.1 °C, and an energy input of 259 J.

Rearranging the formula, we can solve for c:

c = q / (m * ΔT)

Substituting the given values:

c = 259 J / (25.0 g * 6.1 °C)

c ≈ 0.169 J/g·°C

This value indicates that the metal requires 0.169 Joules of energy to raise the temperature of 1 gram of the metal by 1 degree Celsius. The specific heat value is a characteristic property of the metal and can be used to identify the metal or compare it to known values for different metals.

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Spectral absorption and emission lines are important tools used to determine the composition of a gas. When light passes through a gas, certain wavelengths are absorbed by the gas particles. This results in dark absorption lines in the spectrum.

Each element and molecule has its unique absorption lines, allowing us to identify the composition of the gas based on the presence and position of these lines.
On the other hand, when a gas is excited, it emits light at specific wavelengths, resulting in bright emission lines in the spectrum. Similar to absorption lines, emission lines are also characteristic of specific elements and molecules. By analyzing the positions and intensities of these lines, we can determine the composition of the gas.
Spectral absorption and emission lines provide a fingerprint for each gas, enabling scientists to identify the elements and molecules present. This information is valuable in various fields, such as astronomy, chemistry, and environmental science. By studying these lines, we can gain insights into the chemical makeup of gases, helping us understand their properties and behavior.

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Protons are the subatomic particles which has positive charge.

The protons define the element.

So for example, every element that has 1 proton is hydrogen.

Hydrogen is a gas.

Every element that has 23 protons would be vanadium.

Vanadium is a chemical element with an atomic number 23.

Answer: NaCN and HBr

Explanation:

Answer:Graduated Cylinder

Explanation:

You use the water displacement test to find the volume of irregular shaped objects.

Answer:

Graduated Cylinder

Answer:

Simple distillation for salt and water

Explanation:

Answer:

Dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock

Explanation:

Answer:

I think the answer is 800J

Explanation:

As the kinetic energy goes down, the potential energy goes up

The fugacity in atm for pure ethane at 310 K and 20.4 atm is given by the equation: f = 20.4 exp (-Δg1/RT). The change in chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm is -0.0911RT.

Fugacity is a measure of the escaping tendency of a component in a mixture, which is defined as the pressure that the component would have if it obeyed ideal gas laws. It is used as a correction factor in the calculation of equilibrium constants and thermodynamic properties such as chemical potential. Here we need to determine the fugacity in atm for pure ethane at 310 K and 20.4 atm and the change in the chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm. So, using the formula of fugacity: f = P.exp(Δu/RT) Where P is the pressure of the system, R is the gas constant, T is the temperature of the system, Δu is the change in chemical potential of the system.  Δu = RT ln (f / P)The chemical potential at the initial state can be calculated using the ideal gas equation as: PV = nRT    

=>  P

= nRT/V

=> 20.4 atm

= nRT/V

=> n/V

= 20.4/RT The chemical potential of the system at the initial state is:

Δu1 = RT ln (f/P)

= RT ln (f/20.4) Also, we know that for a pure substance,

Δu = Δg. So,

Δg1 = Δu1 The change in pressure is 24 atm – 20.4 atm

= 3.6 atm At the second state, the pressure is 24 atm.

Using the ideal gas equation, n/V = 24/RT The chemical potential of the system at the second state is: Δu2 = RT ln (f/24) = RT ln (f/24) The change in chemical potential is Δu2 – Δu1 The change in chemical potential is

Δu2 – Δu1 = RT ln (f/24) – RT ln (f/20.4)

= RT ln [(f/24)/(f/20.4)]

= RT ln (20.4/24)

= - 0.0911 RT Therefore, the fugacity in atm for pure ethane at 310 K and 20.4 atm is:

f = P.exp(Δu/RT)

=> f

= 20.4 exp (-Δu1/RT)

=> f

= 20.4 exp (-Δg1/RT) And, the change in the chemical potential between this state and a second state of ethane where the temperature is constant but pressure is 24 atm is -0.0911RT. Therefore, the fugacity in atm for pure ethane at 310 K and 20.4 atm is given by the equation: f = 20.4 exp (-Δg1/RT). The change in chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm is -0.0911RT.

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Answer:

Metallic character (becoming less metal like)

Explanation:

I took the test

Answer:

Explanation:

You can view more details on each measurement unit: molecular weight of Copper(I) Oxide or grams The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Copper(I) Oxide, or 143.0914 grams.