NEEEDDDD HELP ASAP PLZ PLZ PLZ PLZ PLZ HELP ME

The concentration of Ca(OH)2 in the solution is approximately 1.33 x 10^(-6) M.

To find the concentration of Ca(OH)2 in a solution with a pH of 8.57, we need to use the concept of pOH, which is the negative logarithm of the hydroxide ion concentration ([OH-]). The pOH can be calculated by subtracting the pH from 14, which gives us 14 - 8.57 = 5.43.

Since Ca(OH)2 produces two OH- ions for every molecule of Ca(OH)2 that dissolves, the concentration of OH- ions will be twice the concentration of Ca(OH)2. Thus, we have [OH-] = 2x, where x represents the concentration of Ca(OH)2.

Taking the antilogarithm of the pOH, we find that [OH-] = 10^(-pOH) = 10^(-5.43).

Since [OH-] = 2x, we can write 2x = 10^(-5.43) and solve for x.

x = (10^(-5.43))/2 ≈ 1.33 x 10^(-6) M

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Answer:

FDA

Explanation:

Answer:

FDA

Explanation: it right ;)

Answer: As one atomic dipole nears another atom it will affect the electron density distribution, so for example if the slightly positive end of the atom is located next to another atom, it will attract the electron(s) in the other atom. A covalent bond happens when atoms share an electron between them. The other kind of bond is called ionic, and it happens when one atom gives an electron to another atom. These bonds are held together with electric forces. Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.

Answer:

there are relatively few atoms but they can make many molecules

Explanation:

A ball held at 3 metres

Explanation:

Because it is in motion.

Answer:

B

Explanation:

To balance the positive charge of a barium ion (Ba+2), 2 chloride ions (Cl-1) are needed.

In order to balance the positive charge of a barium ion (Ba+2), we need to determine the number of chloride ions (Cl-1) required to neutralize the overall charge. Barium ion (Ba+2) has a positive charge of +2, while a chloride ion (Cl-1) has a negative charge of -1. To balance the charges, we can use the following equation:

(Number of Cl-1 ions) x (Charge of Cl-1 ion) = (Charge of Ba+2 ion)

Let's plug in the values and solve for the number of chloride ions:

(Number of Cl-1 ions) x (-1) = +2

To find the number of chloride ions needed, simply divide the charge of the barium ion by the absolute value of the charge of a chloride ion:

Number of Cl-1 ions = (+2) / (|-1|)

Number of Cl-1 ions = 2

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The chemical shift of the proton, given its resonance frequency of 147 Hz downfield from TMS in an NMR operating at 80 MHz, is approximately -999,998.16 ppm.

To calculate the chemical shift in parts per million (ppm) of a proton, given its resonance frequency downfield from TMS (Tetramethylsilane) in an NMR operating at 80 MHz, we can use the following formula:

Chemical Shift (in ppm) = (Resonance Frequency - Reference Frequency) / Reference Frequency

In this case, the resonance frequency is given as 147 Hz downfield from TMS, and the reference frequency is 80 MHz.

First, we need to convert the reference frequency from MHz to Hz:

Reference Frequency = 80 MHz * 10^6 Hz/MHz

Reference Frequency = 80,000,000 Hz

Now we can calculate the chemical shift in ppm:

Chemical Shift = (147 Hz - 80,000,000 Hz) / 80,000,000 Hz

Chemical Shift = -79,999,853 Hz / 80,000,000 Hz

Chemical Shift ≈ -0.99999816

Finally, we can convert the chemical shift to ppm by multiplying by 10^6:

Chemical Shift (in ppm) = -0.99999816 * 10^6

Chemical Shift (in ppm) ≈ -999,998.16 ppm

Therefore, the chemical shift of the proton is approximately -999,998.16 ppm.

The chemical shift of the proton, given its resonance frequency of 147 Hz downfield from TMS in an NMR operating at 80 MHz, is approximately -999,998.16 ppm.

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Answer: Al:Al2O3 = 3: 1

Explanation:

the answer is 1

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:

ye but sdfajkd tryng to play me

Explanation:

Answer:

Vapor is released out of the lemonade because when you place it in a hot it will increase.

Explanation:

The nucleophile  used to react with butyl iodide to form te compound below is :

A Nucleophile is a molecule in a chemical reaction that seeks for a positive center of the reaction ( i.e. nucleus ) and this is because of the presence of a electron pair in the Nucleophile.

Given the compound expressed in the question the chemical reaction that takes place between the nucleophile and butyl iodide is called Nucleophilic substitution reaction.

Hence we can conclude that the nucleophile that could be used to react with butyl iodide is CH₃CH₂O⁻

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Attached below is the complete question

Answer:

Liquid; melting.

Explanation:

So what is being shown is a phase change diagram. Because we start at an atm of 1.5 (staying steady means that it doesn't drop so we always stay at 1.5 atm) and at a temperature of -150, the original state of matter is a solid. Next, we look at what happens when the temperature goes to 300 degrees, yet still maintaining the 1.5 atm. This means that it now turns into a liquid (based on placement on diagram). This means the matter after the temperature change was a liquid. And going from solid to liquid would be called melting.

Here's an example phase diagram so that you can rely on it in the future problems!

The percent yield of Jen's experiment is 100%.

To calculate the percent yield of Jen's experiment, we need to compare the actual yield (the amount of Na2CO3 she collected) to the theoretical yield (the amount of Na2CO3 that should have been produced based on the starting amount of NaHCO3).

The balanced equation for the decomposition of NaHCO3 is:

2 NaHCO3 -> Na2CO3 + H2O + CO2

According to the equation, 2 moles of NaHCO3 should produce 1 mole of Na2CO3. We can use the molar mass of NaHCO3 (84.01 g/mol) and Na2CO3 (105.99 g/mol) to calculate the theoretical yield.

The theoretical yield of Na2CO3 can be calculated as:

Theoretical yield = (mass of NaHCO3) x (1 mol Na2CO3 / 2 mol NaHCO3) x (molar mass of Na2CO3)

Theoretical yield = (2.00 g) x (1 mol Na2CO3 / 2 mol NaHCO3) x (105.99 g/mol Na2CO3)

Theoretical yield = 1.05 g

Since the actual yield is also 1.05 g, the percent yield can be calculated as:

Percent yield = (actual yield / theoretical yield) x 100

Percent yield = (1.05 g / 1.05 g) x 100

Percent yield = 100%

Therefore, the percent yield of Jen's experiment is 100%.

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Answer:

The answer is 1/3 of the population.

You can fill in the table for other elements and their respective isotopes by determining the appropriate number of protons, neutrons, and electrons based on the given isotope mass number and atomic number.

To accurately fill in the table with the correct number of subatomic particles for the elements given the isotope mass number, we need to consider the composition of atoms and their respective subatomic particles. Atoms are composed of protons, neutrons, and electrons.

The number of protons in an atom is equivalent to its atomic number, which uniquely identifies the element. The number of neutrons can be determined by subtracting the atomic number from the isotope mass number. Electrons in a neutral atom are equal to the number of protons.

Let's take an example using the isotope mass number:

Isotope: Carbon-14 (mass number = 14)

Element: Carbon (atomic number = 6)Based on the atomic number and isotope mass number, we can determine the number of subatomic particles as follows:

Protons: 6 (same as the atomic number)

Neutrons: 14 - 6 = 8

Electrons: 6 (same as the number of protons in a neutral atom)

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The molarity and the density of the saturated Brine solution is 6.12M and 1.358Kg/L respectively.

The brine solution is composed of water and NaCl.

The volume of water is 1 liter and 358 grams is the mass of NaCl.

We know,

Molarity = Moles/volume

Moles of NaCl = Mass of Nacl/Molar mass of NaCl

Mass of NaCl = 358

Molar mass of NaCl = 58.44 g/mol

Moles of NaCl = 358/58.44

Moles of NaCl = 6.12

Molarity of NaCl = 6.12/1

Molarity of NaCl = 6.12M.

We know, the mass of one liter water is one Kg.

Hence, total mass of the solution = 1+0.358

Mass of solution = 1.358 kg.

The volume of the solution is 1 leiter.

Density = mass/volume

Density = 1.385/1

Density = 1.358kg/l

Hence, the density of the solution is 1.358 kg/L and molarity of the solution is 6.12 M.

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Answer:

d. Caesium

Explanation:

Actually Rubidium is more reactive than potassium but since it is not in the options given, Caesium is the next most reactive

The ratio of the volume and temperature of the gas in the given table is as follows:

Charles's law, also known as the law of volumes, describes the relationship between the volume and temperature of a gas at a constant pressure. According to this law, the volume of a gas is directly proportional to its absolute temperature (measured in Kelvin) when the pressure is constant.

In other words, as the temperature of a gas increases, its volume will also increase proportionally, and vice versa. Mathematically, Charles's law can be expressed as:

V/T = k

where V is the volume of the gas, T is its temperature in Kelvin, and k is a constant of proportionality.

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The capacity of an atom to absorb electrons can be indicated by its electron affinity. An atom gains electrons more readily the lower its first electron affinity. The ability of an atom to gain electrons is weaker the higher the electron affinity. The ionization energy demonstrates an atom's capacity to lose electrons.

What is effective nuclear charge ?

The attractive positive charge of nuclear protons acting on valence electrons is known as effective nuclear charge. Due to the shielding effect, the effective nuclear charge is always smaller than the total amount of protons in a nucleus.

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Most electronegative atom will always lie in the central position.

For example: Ammonia (NH3)

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Between A and B

The highest probability is that A and B are solids and they are forming liquid or gases.

Between A and C

Highest probability is that A and C are gases and they are turning into liquid or solid

Answer:

H2O  2

Explanation:

H2O because 2 H2 +  O2--- 2 H2O. 17.14 g of H2 and 1.14 g of O2= H2O

The mass of salt in the tank after t minutes can be determined using the formula: Mass of salt = concentration of salt × volume of solution.

To find the mass of salt in the tank after t minutes, we need to multiply the concentration of salt by the volume of the solution. The concentration of salt is given as 0.03 kg/L, and the volume of the solution is given as kg. Therefore, the mass of salt can be calculated by multiplying 0.03 kg/L by kg.

The concentration of salt in the tank will reach 0.03 kg/L after minutes. This means that at this time, the amount of salt in the tank will be such that if it is divided by the volume of the solution, it will equal 0.03 kg/L. To calculate the time it takes for the concentration of salt to reach 0.03 kg/L, we need to divide the mass of salt by the volume of the solution and then multiply it by 1/L. This will give us the time in minutes.

In the second part of the question, a cold drink initially at 35°F warms up to 38°F in 3 minutes while sitting in a room of temperature 72°F. To find how warm the drink will be if left out for 30 minutes, we need to consider the rate at which the drink warms up and the time it is left out.

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Answer:

when there is more kinetic energy the objects moves fast...

Answer:

D. \( O^{2-}\)

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Oxygen has a total number of eight (8) electrons and as such the \( O^{2-}\) is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.

Hence, \( O^{2-}\) contains the same number of electrons as an atom of neon.

The ground state electron configuration of ground state gaseous neutral polonium is [Xe]. 4f14. 5d10.

The electron configuration of an element describes how electrons are disbursed in its atomic orbitals. Electron configurations of atoms observe a well-known notation wherein all electron-containing atomic subshells  are positioned in a sequence.

Eighty four electrons  successively occupy to be had electron shells (rings). Polonium is a radioactive metalloid in organization 16, length 6, and the p-block of the periodic table. Discovered in 1898 through the Curies, it turned into named after Poland. Polonium-209 has a half-lifestyles of 103 years.

The symbols used for writing the electron configuration begin with the shell wide variety (n) observed through the kind of orbital and in the end the superscript suggests what number of electrons are withinside the orbital. For example: Looking on the periodic table, you may see that Oxygen has eight electrons.

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Answer:

frost, hail, sleet

Explanation:

Answer:

its the second answer

Explanation:

The equation for the perpendicular bisector of the line segment whose endpoints are (9,3) and (−3,−9) = y = -x.

To find an equation for the perpendicular bisector of the line segment whose endpoints are (9,3) and (−3,−9), we will first find the midpoint of the line segment and then the slope of the perpendicular bisector.
The midpoint of the line segment can be found using the formula:
Midpoint = [(x₁ + x₂)/2 , (y₁ + y₂)/2]
= [(9 + (-3))/2 , (3 + (-9))/2]
= [(6)/2 , (-6)/2]
= (3 , -3)
The slope of the line segment can be found using the formula:
Slope = (y₂ - y₁)/(x₂ - x₁)
= ((-9) - 3)/((-3) - 9)
= (-12)/(-12)
= 1
The slope of the perpendicular bisector will be the negative reciprocal of the slope of the line segment, which is -1.
Using the point-slope form of a line, the equation for the perpendicular bisector can be found:
y - y₁ = m(x - x₁)
y - (-3) = -1(x - 3)
y + 3 = -x + 3
y = -x
Therefore, the equation for the perpendicular bisector of the line segment whose endpoints are (9,3) and (−3,−9) is y = -x.

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Answer:Evaporation

Explanation: