What is the final step in scientific polling?
A. interpreting the results
B. selecting the sample
C. presenting carefully worded questions
D. identifying the universe

The molar volume is calculated dividing molar mass of compound by it's density.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.Molar mass gives the molecular weight of a substance required for making the solutions.

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Answer:

volcanic eruption caused by plate tectonics.

Explanation:

Constructive process is one in which memories are influenced by some events. When a person tries to retrieve the memory he first click some event which is associated with that memory and then whole flash backs comes to his mind.

A compound has the empirical formula NaSO4 and a molar mass of 238 g/mol. Its molecular formula is Na2SO4. The correct option is c.

To find the molecular formula of a compound, we need to determine the ratio between the empirical formula mass and the molar mass. The empirical formula mass of NaSO4 is:

Na: 22.99 g/mol
S: 32.06 g/mol
O4: 4 x 16.00 g/mol = 64.00 g/mol

Total: 22.99 + 32.06 + 64.00 = 119.05 g/mol

Now, we can find the ratio between the empirical formula mass and the molar mass:

238 g/mol / 119.05 g/mol = 2

Since the ratio is 2, we can multiply each subscript in the empirical formula by 2 to find the molecular formula:

Na2SO4

Therefore, the molecular formula of the compound is Na2SO4.

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Hydrogen Bonding is the strongest of the intermolecular forces because it is the attraction of the positively charged end of one molecule to the negatively charged end of another molecule.

Molecules are the smallest particles of matter that have all of the chemical properties of an element or compound. They are made up of two or more atoms held together by chemical bonds. Molecules can be made of different types of atoms and can vary in size, shape and structure. They are an essential part of all living organisms and are responsible for the formation of many chemical reactions.

1. Hydrogen Bonding

2. Dipole-Dipole Interactions

3. London Dispersion Forces

4. Ion-Dipole Interactions

Rank from weakest to strongest IMF:

3. London Dispersion Forces

2. Dipole-Dipole Interactions

4. Ion-Dipole Interactions

1. Hydrogen Bonding

London Dispersion Forces are the weakest of the intermolecular forces because they are a temporary attraction of the electrons of the atoms of two different molecules. Dipole-Dipole Interactions are slightly stronger than London Dispersion forces because they are the attraction of a positive end of one molecule to the negative end of another molecule. Ion-Dipole Interactions are stronger than Dipole-Dipole Interactions because they are the attraction of an ion to the oppositely charged end of a molecule. Finally, Hydrogen Bonding is the strongest of the intermolecular forces because it is the attraction of the positively charged end of one molecule to the negatively charged end of another molecule.

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In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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2.83 lamda is the wavelength of a wave with a frequency of 105.7 x10^6 Hz in here.

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Answer:

24

Explanation:

The number of protons in the atom of the neutral element will also be 24.

Protons are the positively charged particles in an atom.

Electrons are the negatively charged particles

Neutrons do not carry any charges at all

Now, in a neutral atom, the charge is balanced and the number of protons and electrons are the same in the atom.

So, since we have been given that the atom has 24 electrons, the number of protons will be 24.

The compound which contains  an alkaline earth metal and a halogen is CaCl₂.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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The excess soil that travels downstream will destroy the fish habitat thereby reducing the biodiversity.

Biodiversity can be defined as different forms of life found on earth.

The biodiversity of an ecosystem is very important because it shows the importance of different organisms, no matter how small, and the roles they play in the ecosystem.

The washing away of the soil into the stream will disrupt the aquatic ecosystem.

This can lead to increased pollution and sedimentation in the streams.

If the effects are not controlled, it would lead to depletion of fish species.

Therefore, the excess soil that travels downstream will destroy the fish habitat thereby reducing the biodiversity.

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Answer:

Answer and Explanation: To determine the number of moles of silver (Ag), we simply need to divide the number of atoms of Ag by the Avogadro's number, N , which is equal to 6.02 10 atoms of Ag per mole of Ag. Therefore, c) 6.3 moles of Ag are present in a sample of 3.8 10 atoms Ag.

Answer:

VC = 18

Explanation:

Since L is the midpoint and you have LV, you know that LC is also 9.

The average atomic mass of  istopes is 207.217126723 amu

Isotopes are members of family of an electron having same no. of protons but different no. of neutrons.

For the average atomic mass we have to multiply the masses to the abundance % of isotopes and then add all the mass.

1) 2.203.97304 amu has an abundance % of 1.390

    = 203.97304 × 1.390

    = 283.5225256/100 amu

2) 205.97447 amu has an abundance % of 24.11

      = 205.97447 × 24.11

      = 4966.0444717 /100 amu

3) 206.97590  amu has an abundance of % 22.09

      = 206.97590 ×22.09

      = 4572.097631 /100 amu

4) 207.9765  amu has an abundance of % 52.41

       = 207.9765 × 52.41

       = 10900.048365 /100 amu

now, the average atomic mass is

= (283.5225256 + 4966.0444717 + 4572.09731+10900.048365)/100 amu

= 207.217126723 amu

Therefore, The average atomic mass of  isotopes is 207.217126723 amu

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1) Grams of lead.

Convert grams of lead (II) nitride to moles of lead (II) nitride

Convert moles of lead (II) nitride into moles of Pb

Convert moles of Pb into grams of Pb

There is 31.64 g of ions of lead in the sample of paint.

Using the concepts of balanced equations, we got that Fe³⁺ has 2 ions,

SO₄²⁻ has 1 ions, Sn\(4^{+}\) has 3 ions, Cl⁻ has 1 ions when aqueous solution is formed

A balanced equation is a equation  in which the number of atoms for each element in the reaction and the total charge is  same for both the reactants and the products.  Means, we can say that  the mass and the charge are balanced on both sides of the reaction.

The balanced chemical equation is

4Fe₂(SO₄)₃ + 6SnCl₄------->6Sn(SO₄)₂+8FeCl₃

Hence, after observing the above balanced chemical equations we get when we prepare aqueous solutions of fe2(so 4) 3 and Sncl4  in 1 M, then

2 ions as Fe³⁺ ,1 ions as SO₄²⁻ ,3 ions as Sn\(4^{+}\),1 ions as Cl⁻ will be formed.

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The mass of oxygen gas produced, given that 15.8 g of potassium permanganate is heated until no more oxygen gas is given off is 1.6 g

From the question given, the following data were obtained:

The mass of oxygen gas produced from the reaction can be obtained as follow:

Mass of potassium permanganate = Mass of remaining substance + mass of oxygen

Inputting the given parameters, we have:

15.8 = 14.2 + mass of oxygen

Collect like terms,

Mass of oxygen = 15.8 - 14.2

= 1.6 g

Thus, we can conclude that the mass of oxygen gas produced from the reaction is 1.6 g

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Answer:

11. Redox

12. Acid/Base

13. Precipitation

14. Combustion

15. Precipitation

Answer:

nitrogen-14 isotope

Explanation:

The pH of milk of magnesia (Mg(OH)2) is approximately 10.5. Therefore, the correct answer is B.

What is Milk of Magnesia?

Milk of magnesia is a liquid suspension of magnesium hydroxide, which is an inorganic compound with the chemical formula Mg(OH)2. It is commonly used as an antacid to neutralize stomach acid and relieve indigestion, heartburn, and other gastrointestinal symptoms. Magnesium hydroxide works by reacting with the hydrochloric acid in the stomach to form magnesium chloride and water, which raises the pH of the stomach and reduces the acidity. Milk of magnesia can also be used as a laxative to relieve constipation, as it helps to draw water into the colon and soften the stool.

Its pH can be calculated based on the dissociation of the magnesium hydroxide in water:

Mg(OH)2 + H2O ⇌ Mg2+ + 2OH-

The hydroxide ion concentration, [OH-], is related to the pH by the equation:

pH = 14 - pOH

where pOH = -log[OH-].

The dissociation constant (Kw) of water is 1.0 x 10^-14 at 25°C, and the concentration of the hydroxide ions in milk of magnesia is dependent on the solubility of magnesium hydroxide in water.

At 25°C, the solubility product (Ksp) of Mg(OH)2 is 1.8 x 10^-11. The concentration of hydroxide ions in milk of magnesia can be calculated using the Ksp:

Ksp = [Mg2+][OH-]^2

Since magnesium hydroxide is a weak base, the concentration of hydroxide ions will be less than the concentration of magnesium ions in the solution.

Therefore, the pH of milk of magnesia will be greater than 7, and is typically around 10.5.

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The purpose of the sodium bicarbonate in the isolation step is the neutralize and the unreacted carboxylic acid. The gas was evolved during the reaction is CO₂. The balanced equation for the reaction is :

NaHCO₃  +  HCl   --->  NaCl  +   H₂O  +  CO₂

The Sodium bicarbonate is NaHCO₃ which is used to the neutralize the unreacted carboxylic acid or the catalyst  that is concentrated sulfuric acid is which are dissolved in the layer of organic substance.

The reaction of the sodium bicarbonate with hydrochloric acid is as :

NaHCO₃  +  HCl   --->  NaCl  +   H₂O  +  CO₂

The  gas was evolved during the chemical reaction is the carbon dioxide, CO₂.

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Answer:

36kcal

Explanation:

There are three things that occur in the process not converting ice to steam. They are;

I) fusion of ice

ii) heating of water to 100°C

iii) vaporization of water at 100°C to yield steam

Hence, total heat required to convert ice to steam=

Latent heat of fusion of ice + heat required to raise the temperature of water to 100°C + Latent heat of vaporization of water

Thus;

H= mLfus + mcθ + mLvap

H= m(Lfus + cθ + Lvap)

H= 50(80 + 1(100) + 540)

H= 36000cal

H= 36kcal

A. n = 105 lines/mm = 105000 lines/m

d*sin θ  = m*λ

(1/105000) * sin θ = 1*498*10^-9 ⇒     θ =  3.0 degree

Also  (1/105000) * sin θ = 1*569*10^-9 ⇒     θ =  3.43 degree

Δθ = 3.43° – 3.0°

Δθ = 0.43°

b) Chromatic Resolving power, R = λ / Δλ

λ  / Δλ  =  m (width) n

589 /0.59 = 2 (width) (105000)

Width = 4.75 mm

Diffraction gratings can split beams of different wavelengths into a spectrum of related lines through the principle of diffraction. In certain directions, only waves of certain wavelengths have obtained the rest are destroyed by their respective interference. other.

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Answer:

A

Explanation:

DNA and RNA being nucleic acids are proteins in nature hence same theory but just modified.

Answer:

B, C, and D are fluids.

Explanation:

Answer:

30 molecules

Explanation:

easy

Answer:

The answer is w because it just keeps going up the graph

Answer:

B. W

Because the line is straight thus the speed is constant

EDTA (ethylenediaminetetraacetic acid) is commonly used to determine the hardness of water due to its ability to form complexes with metal ions, particularly calcium and magnesium ions.

Water hardness refers to the concentration of calcium and magnesium ions present in water. These ions can cause scaling, reduce the effectiveness of soaps, and have other negative effects. EDTA acts as a chelating agent, meaning it can bind to metal ions and form stable complexes.

In the process of determining water hardness, a known amount of EDTA solution is added to a water sample. The EDTA molecules form complexes with the calcium and magnesium ions present in the water.

The endpoint of the titration is reached when all the metal ions are complexed by the EDTA, resulting in a color change or an indicator reaching a specific endpoint.

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Answer:

i think the answer is c because it says that is all they care

The hybridization on the S atom in SF6 is sp3d2.

In order to determine the hybridization on the S atom in SF6, we first need to draw the Lewis structure for SF6. The Lewis structure shows that the S atom is surrounded by 6 fluorine atoms, each of which is bonded to the S atom. There are no lone pairs on the S atom.

To determine the hybridization on the S atom, we need to count the number of electron groups (bonded atoms and lone pairs) around the S atom. In this case, there are 6 electron groups around the S atom. We then use the formula for hybridization, which is:

hybridization = number of electron groups

For SF6, the hybridization on the S atom is:

hybridization = 6

Therefore, the hybridization on the S atom in SF6 is sp3d2.

The hybridization on the S atom in SF6 is sp3d2, which means that the S atom is surrounded by six electron groups, including five hybrid orbitals and one unhybridized p orbital.

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Bliss and Lømo experiments found that brief, high-frequency electrical stimulation of the perforant path synapses on the neurons of the dentate gyrus produces long-term potentiation (LTP).

Bliss and Lømo conducted an experiment in which they investigated the induction of long-term potentiation (LTP) in the dentate gyrus region of the rat hippocampus. They discovered that short, high-frequency bursts of electrical impulses induced long-term potentiation (LTP) in the dentate gyrus synapses, which persisted for an extended period.

Their findings on LTP led to the development of a popular model of synaptic plasticity in which brief, high-frequency stimulation of presynaptic neurons can create a long-lasting enhancement in synaptic strength. Synaptic potentiation occurs when the synapse's efficacy or strength improves as a result of previous activity. Long-term potentiation (LTP) is a kind of synaptic potentiation that occurs in the brain's hippocampus and is believed to be a key element in learning and memory.

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