what volume of water has the same mass as 9.0m3 of ethyl alcohol? express your answer with the appropriate units.

Answer:

\({ \rm{Pb_{3}( PO_{3})_{2} + 3K_{2}CO _{3} →2 K_{3} PO_{3} + 3PbCO_{3}}}\)

Therefore, without Ca2+, the release of neurotransmitters and subsequent communication between neurons in a chemical synapse would not occur.

Ca2+ plays a crucial role in the chemical synapse as it is responsible for triggering the release of neurotransmitters from the presynaptic neuron. When an action potential reaches the terminal button of the presynaptic neuron, it causes voltage-gated Ca2+ channels to open, allowing Ca2+ ions to flow into the cell. This influx of Ca2+ causes the synaptic vesicles containing neurotransmitters to fuse with the presynaptic membrane and release their contents into the synaptic cleft. The neurotransmitters then bind to receptors on the postsynaptic membrane, triggering a response in the receiving neuron.

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Since there is no way to conduct heat, the temperature of the objects in the space will remain the same for a long time. Hot objects stay hot and cold things stay cold.

Answer:

Atom

Explanation:

An atom is the smallest unit which represents the an element.

It retains the chemical properties of an element.

Option A is correct way of representation of electronic configuration.

Answer:

i am not 100% sure but i think it is 16 sorry if i am wrong

Explanation:

Answer:

16

Explanation:

Answer:

approx 17.1429 days rounded up = 18days

Explanation:

400÷70 =5.7143 × 3 = 17. or rounded up = 18days

Answer:

Henry Moseley was an English physicist whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number.

1.42 × \(10^{-1}\) mol would take 14.79 min to effuse.

How long would it take to effuse?

Mathematically,

Rate of effusion =  \(\sqrt{1/M}\) ; M= Molar mass

For comparative study between two subjects, we can write:

\(r_{2} / r_{1}\)= \(\sqrt{m1/m2}\)

In this case, Ne be gas 1 and Xe be gas 2,

∴ r(Xe) = r(Ne)\(\sqrt{20.1797/131.293}\)

r(Xe) = 9.60×10\(^{-3}\)mol/min

Thus, for Xe  9.60×10\(^{-3}\) mol effuses in 1 minute,

1.42 × \(10^{-1}\) would effuse in 1.42 × \(10^{-1}\) /9.60×10\(^{-3}\) = 14.79 min

Thus, 1.42 × \(10^{-1}\)  mol would take 14.79 min to effuse.

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The molar mass of hemoglobin is 7.73 x 10⁻⁴ g/mol. Hemoglobin is a protein found in red blood cells (erythrocytes) that plays a crucial role in transporting oxygen throughout the body.

To calculate the molar mass of hemoglobin, we need to use the information that hemoglobin has 4 iron atoms per molecule and contains 0.40% iron by mass.

Since iron has a molar mass of 55.845 g/mol, we can calculate the mass of iron in one mole of hemoglobin as follows:

Mass of iron in one mole of hemoglobin = (4 iron atoms/molecule) x (1 mole hemoglobin/6.022 x 10²³ molecules) x (55.845 g/mol iron) = 1.86 x 10⁻²³ g

Next, we can use the percent composition of iron in hemoglobin to calculate the mass of hemoglobin that contains 1 mole of iron:

Mass of hemoglobin containing 1 mole of iron = (1 mole iron/0.40% iron by mass) x (1.86 x 10⁻²⁰ g iron/mole)

= 4.65 x 10⁻¹⁸ g

Finally, we can calculate the molar mass of hemoglobin by dividing the mass of hemoglobin containing 1 mole of iron by the number of moles of hemoglobin in that mass:

Molar mass of hemoglobin = (4.65 x 10^-18 g hemoglobin) / (6.022 x 10⁻²³ molecules/mole) = 7.73 x 10⁻⁴ g/mol

Therefore, the molar mass of hemoglobin is 7.73 x 10⁻⁴ g/mol.

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In an atom, the energy level (n) is given by the distance of an electron from the nucleus. In other words, the electron energy levels in an atom are a measure of the distance between the electrons and the nucleus.

The distance between the electrons and the nucleus determines the amount of potential energy that the electrons possess.

The greater the distance, the greater the energy and the more energy required to keep the electrons in that orbital.

According to the Bohr model, energy levels have different sublevels that have different energies. An orbital's shape and energy are determined by its sublevel, which is designated by a lowercase letter.

A sublevel with l=2 has more energy than a sublevel with l=0. Furthermore, the greater the value of n, the higher the energy level, and the greater the energy required to keep the electrons in that level. For n=4 and l=2, the energy is greater than for n=5 and l=0. Therefore, the given statement is true.

Summary:For n=4 and l=2, the energy is greater than for n=5 and l=0. This statement is true.

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The statement "the energy for n = 4 and l = 2 state is greater than the energy for n = 5 and l = 0 state" is a false statement.

The energy level of an electron in an atom is directly proportional to the distance between the electron and the nucleus. Electrons with higher energy levels are farther from the nucleus than electrons with lower energy levels. An electron's energy level is determined by its distance from the nucleus and its distribution of electrical charge.For the hydrogen atom, the energy of an electron in the nth energy level can be calculated using the following formula:En = - (13.6 eV/n^2) where n is the principal quantum number. The energy of an electron is dependent on the principal quantum number, n, rather than the angular momentum quantum number, l. The energy of an electron decreases as its principal quantum number increases. This means that electrons in higher energy levels are farther away from the nucleus and have less attraction to the nucleus.

Therefore, the energy of the n = 4 and l = 2 state is less than the energy of the n = 5 and l = 0 state. So, the given statement is false.

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Answer:

b is your answer...........

The test on a urine chemical strip that should be held for 2 minutes before reading the results is the leukocyte esterase test.

The leukocyte esterase test is used to detect the presence of white blood cells in the urine, which can indicate a urinary tract infection. The test strip should be held in the urine sample for 2 minutes before reading the results to ensure accurate results.

It is important to follow the instructions for each individual test on the urine chemical strip, as different tests may have different recommended wait times before reading the results. Always be sure to read the instructions carefully and follow them for the most accurate results.

In summary, the leukocyte esterase test on a urine chemical strip should be held for 2 minutes before reading the results.

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Answer:

In some cases, changes in land use may have positive effects, such as increasing habitat (as a result of deliberate habitat restoration measures) and reclamation of previously contaminated lands for urban/suburban development.

Explanation:

BBBBBBBB

Answer:

D

Explanation:

0•45 is to 400ml which is same as 400cm3

what about in 1000cm3

0•45*1000/400

=1•125M

Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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Answer:

22.4

Explanation:

you should have learned this

Answer:

At standard temperature and pressure, one mole of any gas will occupy a volume of 22.4 litres

Answer:

A open system

I think plz tell me if i'm wrong

Explanation:

Answer:

A- an Open System

Explanation:

Answer:

00.25 mol Ca²+ ions

Explanation:

mass of Ca² ions= 1000 mg = 1000 x 10-³ g = 1 g

molar mass of Ca² + ions = 40.08g /mol

mass x  1 mol/ grams = number of moles

1  g Ca²+ x 1 moles / 40.08 g Ca²+- 0.025 mol Ca²+

i hope that helps lol

If the recommended daily allowance for calcium is 1000 mg of Ca2+ ions, then the number of moles of Ca2+ does 1000 mg represent is 0.025 mol.

Moles is a term which is defined as the ratio of mass of the substance to the molar mass of the substance.

Moles = Given mass/ molar mass

Calcium is one of the element of periodic table which have 20 as atomic number and mass number 40. It belong to 2nd group of the periodic table and 4th period. It belongs to block 's'.

Given,

Daily allowance of calcium = 1000 mg = 1 g

Atomic number of calcium = 40g

By substituting all the values, we get

= 1/ 40

= 0.025 mol.

Thus, we concluded that the number of moles of Ca2+ does 1000 mg represent is 0.025 mol.

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Answer:

False

Explanation:

Kinetic energy is energy due to motion a grain of sand can move easily as compared to cement block.

Morever cement block have potential energy or stored energy.

When the reaction 2 CO (g) + O2 (g) ⇌ 2 CO2 (g) is subjected to pressure, the equilibrium will shift to the side with fewer moles of gas.

The principle that governs the shift in equilibrium when pressure is applied is known as Le Chatelier's principle. According to this principle, an increase in pressure will cause the equilibrium to shift in a way that reduces the total number of gas moles.

In the given reaction, there are three moles of gas on the left side (2 moles of CO and 1 mole of O2) and two moles of gas on the right side (2 moles of CO2). Therefore, the side with fewer moles of gas is the right side.

Conversely, if the pressure is decreased, the equilibrium will shift to the left, favoring the formation of more CO and O2. This shift increases the total number of gas moles and helps to restore the pressure.

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Considering the definition of isotopes and atomic mass of an element, the percent of each isotope is 16.5% abundant for Camerium-111 and 83.5% abundant for Camerium-113.

The same chemical element can be made up of different atoms, where their atomic numbers are the same, but the number of neutrons is different. Thus the isotopes of the element are formed.

The atomic mass of an element is the weighted average mass of its natural isotopes. This is, the atomic mass of a chemical element is usually calculated as the weighted average of the masses of the different isotopes of each element, considering the relative abundance of each of them.

In this case, you know:

Then, the average mass can be expressed as:

111x + 113×(1-x)= 112.67

Solving:

111x + 113×1 -113x= 112.67

111x + 113 -113x= 112.67

111x -113x= 112.67 -113

(-2)x= (-0.33)

x= (-0.33)÷(-2)

x=0.165= 16.5%

Finally, the percent of each isotope is:

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Answer:

TVEL is developing mixed-oxide (MOX) fuel and REMIX fuel, with both using recycled uranium together with plutonium. This is the dual-component approach. "We're very actively engaged in this and right now it is cost-intensive,"

Answer:

Brainliest pls

Explanation:

The nuclear fuel cycle consists of several steps: mining, milling, conversion, enrichment, fuel fabrication, and electricity generation.

Molarity= No of moles of solute * 1000 / vol solution in ml

No of moles= Given mass / Molar mass

Given Mass of solute (H2O2)= 10g

Molar mass of H2O2=34gmol^-1

No of moles= 10/34= 0.294 moles

Volume of solution=50ml

Molarity =   0.294*1000 / 50

Molarity = 5.8M

Answer:yes

Explanation:

this is because the distance doesnt matter

Therefore, you would need to use approximately 0.0282 grams of NaCl to make the 117.3 mL of a 0.434 M aqueous solution of NaCl.

To find the mass of NaCl needed to prepare the solution, we can use the formula:

Mass (g) = Volume (L) x Concentration (M) x Molar mass (g/mol)

First, we need to convert the volume from mL to L by dividing by 1000:

117.3 mL ÷ 1000 = 0.1173 L

Next, we can plug in the given values:

Mass (g) = 0.1173 L x 0.434 M x 58.44 g/mol

The molar mass of NaCl is 58.44 g/mol. Multiplying these values, we get:

Mass (g) = 0.0282 g

Therefore, you would need to use approximately 0.0282 grams of NaCl to make the 117.3 mL of a 0.434 M aqueous solution of NaCl.

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The amount of drink that needs to evaporate to reach a drinkable temperature will vary based on the specific circumstances.

To determine how much of the drink must evaporate for it to reach the drinkable temperature, we need more information about the specific drink and its initial temperature. However, in general, evaporation is a cooling process as it removes heat from the liquid. So, if a drink is initially too hot, some of it will need to evaporate for it to reach a drinkable temperature. The amount that needs to evaporate depends on factors such as the volume and temperature of the drink, as well as the desired drinkable temperature. To calculate the specific amount, you would need to consider the heat transfer properties of the liquid, the surrounding environment, and the time available for evaporation. In conclusion, the amount of drink that needs to evaporate to reach a drinkable temperature will vary based on the specific circumstances.

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Answer:

At the molecular level, the plasma only lets us see ions and electrons released.

Explanation:

Plasma is the fourth state of matter.

A state similar to gas, but with the difference that it does not have an electromagnetic equilibrium. It also has no defined mass or volume unless it is placed in a closed container.

Water in solid-state: A mesh style is seen where its components obtain more attraction force.

But on the other hand, in the plasma something well defined is not seen, since due to the high temperature its molecules give off electrons, leaving only ions and electrons around.

What is the pH of a solution that is 0.75M in sodium acetate and 0.50M in acetic acid is 4.57.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. pH is a unitless quantity. pH depend on the temperature.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution.  At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

pH

=pKa +log(Cs/Ca)

= 4.75 + log(0.5/0.75)

=4.75 +log (0.66)

= 4.57

Therefore,  the pH of a solution is 4.57.

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