Which are Lewis acids and which are Lewis bases?(a) Na⁺(b) NH₃(c) CN⁻(d) BF₃

Becca and Annie obtained a lower yield of sodium stearate in their saponification lab due to incorrect measurements of their reactants.

In the saponification lab, Becca and Annie expected to produce 0.224 g of sodium stearate, but they realized they made a mistake in measuring their reactants. As a result, they obtained only 0.112 g of sodium stearate, which is half of the expected yield.

Accurate measurement of reactants is crucial in chemical reactions to ensure the desired outcome. In this case, the incorrect measurements led to a lower amount of sodium stearate being produced. The reactants used in the lab were likely not in the correct stoichiometric ratio, which affected the yield of the desired product.

The stoichiometry of a reaction determines the ratio of reactants needed for complete conversion and optimal yield. If the reactants are not in the correct proportion, the reaction may not proceed to completion, leading to a lower yield of the desired product. In this case, the incorrect measurements resulted in an insufficient amount of reactants, leading to a lower yield of sodium stearate.

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The value of "n" in the hydrate formula CuSO4 * nH2O is 5.

To determine the value of "n," we need to calculate the molar ratio between the released water and the hydrate copper(II) sulfate.

First, we need to convert the mass of water released to moles. The molar mass of water (H2O) is approximately 18.015 g/mol. Therefore, 5.051 g of water is equal to 5.051 g / 18.015 g/mol ≈ 0.2804 mol.

Next, we calculate the molar ratio between water and copper(II) sulfate. The molar mass of copper(II) sulfate (CuSO4) is approximately 159.609 g/mol. From the balanced chemical equation, we know that one mole of copper(II) sulfate is associated with "n" moles of water.

Assuming that the molar ratio is 1:1 between CuSO4 and H2O, we can set up the following equation:

0.2804 mol H2O = 14.00 g CuSO4 * (1 mol H2O / (159.609 g CuSO4 * n))

By rearranging the equation, we can solve for "n":

n = 14.00 g CuSO4 / (159.609 g CuSO4/mol) = 0.0877 mol

Since "n" represents the number of water molecules, it must be a whole number. Therefore, the closest whole number to 0.0877 is 5.

Therefore, the value of "n" in the hydrate formula CuSO4 * nH2O is 5.

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Answer:

C "Plants die faster when they're overwatered than when they're underwatered.

Answer:

c plants die faster when they're overrated then when there underwater

Answer:

Electricity is made at a generating station by huge generators. The current is sent through transformers to increase the voltage to push the power long distances.  The electrical charge goes through high-voltage transmission lines that stretch across the country.

Answer:

lol im sorry man

Explanation:

Answer:

My old acc got banned

Explanation:

Answer:

Mass = 43.45 g

Explanation:

Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. To find the mass of the substance, we need to multiply the volume occupied by the substance.

Mass = Density x Volume

Mass = 7.9 g/cm^3 (5.5 cm)^3

Mass = 43.45 g

Answer:

89.3 %

Explanation:

M(CH4) = 12+ 4*1 = 16 g/mol

M(O2) = 2*16 = 32 g/mol

M(CO2) = 12 + 2*16 = 44 g/mol

8.50 g * 1 mol/16 g = 0.5313 mol CH4

15.9 g * 1 mol/32 g = 0.4969 mol O2

9.77 g * 1 mol/44 g = 0.2220 mol CO2

1)                                  CH4        + 2O2 -----> CO2 + 2H2O

from reaction             1 mol          2 mol

given                       0.5313 mol   (0.4969 mol)

1 mol CH4              --- 2 mol O2

0.5313 mol  CH4  --- x mol O2

x= 2*0.5313 = 1.0626 mol O2

We can see that for given amount of CH4 we do not have enough O2, so O2 is a limiting reactant.

2)                               CH4        + 2O2 -----> CO2 + 2H2O

from reaction                             2 mol        1 mol

given                                      0.4969 mol   x mol

x = 0.4969*1/2 = 0.2485 mol CO2 theoretical yield

3)

Practical yield CO2 = 0.2220 mol

Theoretical yield CO2 = 0.2485 mol

% yield = (0.2220/0.2485)*100% = 89.3 %

Answer:

somebody answer this please>>>!!!

Explanation:

!!!

For fermentation process to successfully occur, Oxygen gas (O2) must not enter the carboy, because the pyruvate used in the process, gets completely oxidized when oxygen gas is present.

Fermentation is a metabolic process that always must take place in the absence of oxygen. Many of the beneficial microorganisms, create desired changes in different types of beverages and foods through this process of fermentation. And the resulting products of fermentation reaction thus formed, have better/more favorable flavor and taste, and also more life as they get preserved during the process. In addition to this, these microorganisms also provide several health benefits.

The process of fermentation to occur successfully, does not require oxygen gas as it is an anaerobic process. If by any chance or means, oxygen gas is present, the pyruvate used would be completely oxidized during the reaction forming carbon dioxide and water molecules as the by products, by the action of yeast spiration. Moreover, these yeast species needed in the reaction, produce ethanol only in an anaerobic (oxygen-less) environment by another process called the Pasteur Effect.

There are generally three types of fermentation processes based on the end products obtained using the pyruvate. They are:

Acetic Acid Fermentation, Lactic Acid Fermentation, and Alcoholic Fermentation.

Therefore, Oxygen Gas is the correct answer to this question.

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A half-reaction in electrochemistry known as a reduction half-cell reaction illustrates the reduction step in a redox reaction. A reduction process takes place in a reduction half-cell when an oxidising agent

A half-reaction is a chemical reaction in electrochemistry that demonstrates the independent occurrence of either an oxidation or a reduction process. A whole redox reaction is made up of two simultaneous half-reactions, an oxidation and a reduction. Just one element or compound is involved in a half-reaction, and it is either reduced or oxidised. In the half-reaction, the electron acceptor is reduced and the electron donor is oxidised, demonstrating the transfer of electrons.A balanced chemical equation using electrons as either reactants or products often contains a half-reaction. To guarantee charge conservation, the electrons are balanced on both sides of the equation. Understanding electrochemical processes like corrosion, batteries, and electrolysis requires the use of half-reactions. They enable

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Answer: B Is the answer

Explanation:  I just did this

=> the smallest particle of a chemical element that can exist.

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The ions present in KCL are K⁺ and Cl⁻ which forms KCL by ionic bond. KCL is the chemical formula for potassium chloride. It is created when the extra electron from the potassium atom's valence shell is transferred to the chlorine atom's valence shell, completing the octet valency of both atoms.

K with one dot on the right stands for potassium. If the atom is a noble-gas atom, there are two additional processes that could be used. The outermost filled shell can be thought of as the valence shell, or we can assume that the atom has no valence electrons at all.

When compared to chlorine, which has seven electrons and only one valence electron, potassium provides the final electron that chlorine needs to complete its octet. As a result, potassium and chlorine create an ionic bond, resulting in the formation of potassium chloride.

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Answer:

the answer is 1.71 g/mL

Explanation:

84.7/49.6=1.71

hope this will help you ❤️

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.

Answer:

A substance whose molecules do not take up space or interact with one another

A substance whose molecules do not take up space or interact with one another, hence option A is correct.

Molecules are defined as the lowest fundamental unit of a chemical molecule that can participate in a chemical reaction is a group of bound atoms. The smallest identifiable unit into which a pure substance may be divided while retaining its composition and chemical properties is a molecule, which is a collection of two or more atoms.

A theoretical gas known as an ideal gas is made up of several randomly moving point particles with no interparticle interactions. Because it abides by the ideal gas law, a condensed equation of state, and is amenable to statistical mechanics analysis, the ideal gas concept is helpful. The relationship between pressure and volume in an ideal gas is described by the Ideal Gas Law.

Thus, a substance whose molecules do not take up space or interact with one another, hence option A is correct.

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Answer:

atoms

Explanation:

3.

1. 2Fe + 3Cu(NO₃)₂⇒ 2Fe(NO₃)₃ + 3Cu

2. Zn + Cu(NO₃)₂⇒ Zn(NO₃)₂ + Cu

3. 3Zn + 2Fe(NO₃)₃⇒ 3Zn(NO₃)₂ + 2Fe

4. Fe³⁺ reduced to Fe (oxidation number from +3 to 0)

Metal(s) acted as reducing agents : Zn

Further explanation

There are two types of chemical reactions that may occur,  

single-replacement reactions and double-replacement reactions.

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

This series is better known as the Volta series, where the metal element with a more negative electrode potential is on the left, while the element with a more positive electrode potential on the right.

The more left the position of a metal in the series, the more reactive metal (easy to release electrons, the stronger the reduction)

Generally, the Volta series used is

Li K Ba Sr Ca Na Mg Al Mn Zn Cr Fe Cd Co Ni Sn Pb H Sb Bi Cu Hg Ag Pt Au

3.

Fe and Zn element can replace the Cu element, which is on the right side so the reaction will occur

Zn also can replace Fe which is on the right side

1. 2Fe + 3Cu(NO₃)₂⇒ 2Fe(NO₃)₃ + 3Cu

2. Zn + Cu(NO₃)₂⇒ Zn(NO₃)₂ + Cu

3. 3Zn + 2Fe(NO₃)₃⇒ 3Zn(NO₃)₂ + 2Fe

4. Yes, Fe³⁺ reduced to Fe (oxidation number from +3 to 0)

Metal(s) acted as reducing agents : Zn

The transition metals that are paramagnetic but can easily form ferromagnetic alloys with other metals are Iron, Cobalt, and Nickel.

Hence, the correct option is C: Transition metals in groups 8-10, periods 4 and 5.

Paramagnetic substances are substances that are weakly attracted to magnets. The atoms of paramagnetic substances contain electrons that mostly spin in the same direction. They include aluminum, gold, and copper.

Ferromagnetic substances are substances that are strongly attracted to magnets when placed near magnets. They include metals such as Iron, Cobalt, and Nickel.

Transition metals are metals that have partially filled D-orbitals. Hence, transition metals are paramagnetic as well as ferromagnetic.

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Answer:  C) Transition metals in groups 8-10, periods 4

Explanation:

Answer:

23.4 x 10¹²mm

Explanation:

 Given problem;

  Convert Gm to mm;

   Gm  = Gigameters

    mm  = millimeters

   1 Gigameter  = 1 x 10⁹m

    1000mm = 1 m

To convert from Gm to mm;

       23.4 Gm x \(\frac{1 x 10^{9} m}{1Gm}\) x \(\frac{1000mm}{1m}\)   = 23.4 x 1 x 10⁹ x 10³   =

                                                    = 23.4 x 10¹²mm

The time it takes for a gas to diffuse in a room can vary depending on various factors such as the size of the room, temperature, pressure, and the properties of the gas itself. Without additional information, it is not possible to determine the exact time it will take for SO2 to diffuse in the room.

However, the rate of diffusion of a gas is influenced by its molar mass, with lighter gases typically diffusing faster than heavier ones. Since SO2 (sulfur dioxide) has a molar mass of approximately 64 g/mol, which is heavier than helium, it is expected that SO2 would diffuse more slowly than helium. It's important to note that the diffusion rate also depends on the concentration gradient and other factors such as temperature and air currents in the room. Therefore, to accurately determine the time it will take for SO2 to diffuse, more specific information about the room and conditions would be required.

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Answer:

If the speed is increasing, the car has positive acceleration. When the car slows down, the speed decreases. The decreasing speed is called negative.

Answer:

ok so basicalkly he lloked at how the subdiction zone formed and where previus conintal drift occured

Explanation:

We are aware that energy is necessary to break any bond. Therefore, energy from the environment will be absorbed to break the CO bond present in acetone. Currently, the acetone molecule contains a double bond between the CO atoms, and the dissociation energy for this double bond is 745 kJ/mol. Energy Change will therefore be:

Energy from the environment is absorbed at a rate of 745 kJ (E = +745 kJ).

The chemical entity designated by the formula KF is potassium fluoride. The main source of the fluoride ion for use in industry and chemistry, after hydrogen fluoride, is KF. As the rare mineral carobbiite, it is an alkali halide that naturally exists.

A source of potassium that is insoluble in water and is used in oxygen-sensitive processes, such metal synthesis, is potassium fluoride.

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Volume = 5x3x10 = 150 cm cubed

Mass = 150x100 = 15000 grams

Density = 15000/150 = 100g/cm cubed

Answer:

Many thiols have pungent scents that resemble garlic or rotting eggs. Thiols are utilized as odorants to aid in the detection of natural gas (which is odorless in its pure state), and the "fragrance of natural gas" is owing to the thiol's smell.

Explanation: