In a conductivity apparatus, like the one above, you should never touch the ___ while the power is on. A Light Bulb B Leads C Wires D Base of the battery

Answer:

Vietnamese.

Correct for plato

Answer:

The innermost electron shell of an atom can hold up to _____ electrons. ... What determines the types of chemical reactions that an atom participates in? the number of electrons in the outermost electron shell. Atoms with the same number of protons but with different electrical charges

The types of chemical reactions an atom can participate in are determined by its valence electrons, which are the outermost electrons in an atom. The atom's goal in a reaction is usually to achieve a stable structure, like a full or empty outer shell. The periodic table can also guide our understanding of an atom's reactive behaviour.

The types of chemical reactions that an atom participates in are primarily determined by its electronic structure, specifically its valence electrons. These are the electrical charges contained in the outermost shell of an atom. Atoms generally strive to achieve a stable structure, which usually means filling up or emptying the outermost shell. Chemical reactions serve the purpose of reaching this stability. For instance, in a reaction between sodium (which wants to lose an electron) and chlorine (which wants to gain an electron) both atoms achieve a stable structure, forming sodium chloride, a common salt. Periodic table also provides useful information, as atoms in the same group (column) have similar chemical behaviours due to having the same number of valence electrons.

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Answer:

The molecules align with the electric field

Explanation:

Polar molecules have dipoles (parts of the molecules have partial charges). This is because the atoms with a larger atomic mass attract more of the electron cloud of the molecule hence become partially electronegative. The other part of the molecule becomes partially positive. Therefore these parts of the molecule will align with opposite charges including in this case based on the charged metal plates. The positive dipole will align with the negative plate while the negative dipoles will align with the positive plate.

Answer:

The molecules align to the electric field.

Explanation:

A polar molecule is one that is neutral, that is, it does not have a net charge. But it has an internal distribution of charges that form a partially positive region and a partially negative region.

Coulomb's law indicates that charged bodies suffer a force of attraction or repulsion when approaching. The value of this force is proportional to the product of the value of its loads. The force is of attraction if the charges are of opposite sign and of repulsion if they are of the same sign. The force is inversely proportional to the square of the distance that separates them.

Then, following Coulomb's Law, the negatively charged end of the polar molecule will be attracted to the positively charged metal plate. And the positively charged end of the polar molecule is attracted to the negatively charged metal plate.

Then, the molecules align to the electric field.

Answer:

• Earth and space science, life science, physical science is the correct answer.

Explanation:

natural science is the branch of science that deals with the study of natural events, based on experimental proof from research and experimentation.

The three major branches of natural science are

Earth and space science: is the study of the Earth, oceans, land, solar system and atmosphere. it covers all fields of the natural science that are associated with the Earth planet.

life science:The life sciences include the parts of science that include the scientific understanding of living organisms and life( plants, animals , microbes and human beings).

physical science:it deals with studies of non-livings things.

Answer:

165.726 g.

Explanation:

Cr₂O₃ + 3H₂S → Cr₂S₃ + 3H₂O,

It is clear that 1 mol of Cr₂O₃ and 3 mol of H₂S to produce 1 mol of Cr₂S₃ and 3 mol of H₂O.

no. of moles of Cr₂S₃ = mass/molar mass = (324.8 g)/(200.19 g/mol) = 1.62 mol.

Using cross multiplication:

3 mol of H₂S produces → 1 mol of Cr₂S₃, from stichiometry.

??? mol of H₂S produces → 1.62 mol of Cr₂S₃.

∴ The no. of moles of H₂S are needed = (3 mol)(1.62 mol)/(1 mol) = 4.86 mol.

∴ The "no. of grams" of H₂S are needed = (no. of moles of H₂S)(molar mass of H₂S) = (4.86 mol)(34.1 g/mol) = 165.726 g.

Answer:

Hey how are you all doing the answer is 8.93 g

Explanation:

The theoretical yield of carbon dioxide is 8.93 g​

Before performing chemical reactions, it is helpful to know how much product will be produced with given quantities of reactants. This is known as the theoretical yield. This is a strategy to use when calculating the theoretical yield of a chemical reaction. The same strategy can be applied to determine the amount of each reagent needed to produce a desired amount of product.

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Answer:

Explanation:

Remember that the atomic number of an element is the number of protons and the mass number is the number of protons plus neutrons.

1) Deuterium representation:

2) Helium-3 representation:

3) Neutron representation

4) Nuclear equation:

Answer:

the answer is D. on edg 2020

Explanation:

Your answer would be A, Spring A has more potential energy.

Potential energy is exactly what it sounds like - energy that has the potential to exist due to stressors, but doesn't yet. In this case, the spring is ready to jump back into its original position however it can't because of it still being stretched, therefore this tension is what creates potential energy.

When you measure potential energy, the one with greater of it is the one where it has more stress being placed on it. In this case, spring A is being stretched furthest so it has the most potential energy.

Hope this helped!

Answer:

a

Explanation:

Answer:

[tex]\boxed{\text{131 g}}[/tex]

Explanation:

When adding or subtracting values, you must round your answer to the same "place" as the measurement with its last significant figure furthest to the left.  

That is, you round off to the same number of decimal places as the measurement with the fewest decimal places.

[tex]\begin{array}{r|l}101.& \text{g}\\25. & \text{01 g}\\5. & \text{05 g} \\\mathbf{131.} & \text{06 g}\\\end{array}[/tex]

The measurement of 101 g has no digits after the decimal point, so you round off the answer to give no digits to the right of the decimal.

[tex]\text{The sum is }\boxed{\textbf{131 g}}[/tex]

Answer:

[tex]\boxed{\text{656.3 kJ/mol}}[/tex]

Explanation:

The formula for calculating the enthalpy change of a reaction by using the enthalpies of formation of reactants and products is:

[tex]\Delta_{\text{r}}H^{\circ} = \sum \Delta_{\text{f}} H^{\circ} (\text{products}) - \sum\Delta_{\text{f}}H^{\circ} (\text{reactants})[/tex]

                         CaCO₃(s) ⟶ CaO(s) + CO₂(g)

ΔH°f/kJ·mol⁻¹:    -1207.1          -157.3    -393.5

[tex]\begin{array}{rcl}\Delta_{\text{r}}H^{\circ} & = & [-157.3 + (-393.5)] - (-1207.1)\\& = & -550.8 +1207.1\\& = & \textbf{656.3 kJ/mol}\\\end{array}\\\\\text{The enthalpy of decomposition is } \boxed{\textbf{656.3 kJ/mol}}[/tex]

The enthalpy of decomposition is  656.3  KJ/mol.

Given that the enthalpy of decomposition is obtained from;

ΔHrxn = ∑ΔHf(products) -  ∑ΔHf(reactants)

Now, the species involved in the reaction are;

ΔHf(CaO)(s)) = -157.3 KJ/mol

ΔHf((CO2)(g)) = -393.5  KJ/mol

ΔHf(CaCO3)(s)) = -1207.1 KJ/mol

Substituting values;

ΔHrxn = [(-393.5) + ( -157.3)] - ( -1207.1) KJ/mol

ΔHrxn =(( -550.8) + 1207.1)  KJ/mol

ΔHrxn = 656.3  KJ/mol

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Answer:

Explanation:

Chlorine's atomic number is 17.

That means that it has 17 protons and 17 electrons.

Then, you have to write the electron configuration for the 17 electrons.

The noble gas notation is a short notation that uses the previous noble gas symbol (closed in brackets) and adds the new electrons, filling the orbitals in increasing order of energy, which  you can remember using Aufbau rules.

Then:

Result: [Ne] 3s² 3p⁵ ← answer

Answer:

The formula of the compound will be:[tex] [Ru(Cl)_1(H_2O)_5]Cl_2[/tex].

Explanation:

Coordination sphere is an array of ions or ligands around central atom or or an ion. Ions and ligands linked to central atom forms primary coordination sphere and ions or molecules linked to primary coordination sphere forms secondary coordination sphere.

Given: If one mole of [tex]RuCl_3.5H_2O[/tex] reacts with [tex]AgNO_3[/tex] to produce two moles of AgCl precipitate.

This means that in primary coordination sphere there is a 1 chloride ion and 5 water molecules. And remaining 2 chloride ions present in secondary sphere which are available to react with silver ions of silver nitrate solution.

This why on reaction with silver nitrate 2 molecules or silver chloride are formed.

[tex][Ru(Cl)_1(H_2O)_5]Cl_2+2AgNO_3(aq)\rightarrow 2 AgCl(s)+[Ru(Cl)_1(H_2O)_5](NO_3)_2(aq)[/tex]

The formula of the compound will be:[tex] [Ru(Cl)_1(H_2O)_5]Cl_2[/tex].

Final answer:

The proper coordination sphere in the formula RuCl3·5H2O, after reacting with AgNO3 to produce AgCl, is represented by [Ru(H2O)5Cl]Cl2·H2O, indicating one chloride in the sphere, two as counterions, and one water molecule of crystallization.

Explanation:

To rewrite the formula RuCl3·5H2O to show the proper coordination sphere, we need to understand the stoichiometry of the reaction with AgNO3. This compound reacts to form two moles of AgCl, which indicates that two chloride ions are involved in the precipitation reaction. Since only those chloride ions are directly involved in the reaction to form AgCl with AgNO3, they must be in the coordination sphere of the ruthenium complex. The water molecules are assumed to complete the coordination sphere. Therefore, the proper way to write the formula indicating the coordination sphere would be [Ru(H2O)5Cl]Cl2·H2O, showing one chloride in the coordination sphere and two chloride ions outside as counterions with one crystallization water molecule.

Answer:

Most likely stoves and fire places.

Explanation:

Answer: carbon monoxide is found in fumes produced any time you burn fuel in cars or trucks, small engines, stoves, lanterns, grills, fireplaces, gas ranges, or furnaces.

Answer:

When salt is dissolved in water, many physical properties change, among them the so called colligative properties:

Explanation:

Colligative properties are the physical properties of the solvents whose change is determined by the number of particles (moles or ions) of the solute added.

The colligative properties are: vapor pressure, boiling point, freezing point, and osmotic pressure.

Vapor pressure:

The vapor pressure is the pressure exerted by the vapor of a lquid over its surface, in a closed vessel.

The vapor pressure increases when a solute is added, because the presence of the solute causes less solvent molecules to be near the surface ready to escape to the vapor phase, which means that the vapor pressure is lower.

Boiling point:

The boiling point is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure. Since we have seen that the vapor pressure of water decreases when a solute occupies part of the surface, now more temperature will be required for the water molecules reach the atmospheric pressure. So, the boiling point increases when salt is dissolved in water.

Freezing point:

The freezing point is the temperarute at which the vapor pressure of the liquid and the solid are equal. Since, the vapor pressure of water with salt is lower than that of the pure water, the vapor pressure of the liquid and solid with salt will be equal at a lower temperature. Hence, the freezing point is lower (decreases).

Osmotic pressure:

Osmotic pressure is the additional pressure that must be exerted over a solution to make that the vapor pressure of the solvent in the solution equals the vapor pressure of the pure solvent. This additional pressure is proportional to the concentration of the solute: the higher the salt concentration the higher the osmotic pressure.

Answer: The mass number will be 23

Explanation: The mass number refers back to the number of protons and neutrons.

Answer:

c) Cu⁺(g)⟶ Cu²⁺(g) + e⁻

Explanation:

Ionization energy is the energy needed to remove a valence electron from a gaseous atom.

b) Cu(g) ⟶ Cu⁺(g)  + e⁻ represents the first ionization energy, the energy needed to remove the first electron.

c) Cu⁺(g)⟶ Cu²⁺(g) + e⁻ represents the second ionization energy of Cu, the energy needed to remove the second electron after the first one is gone.

a) is wrong. The charge is not balanced.

d) is wrong. It represents the electron gain energy of a Cu⁻ ion (highly unlikely).

e) is wrong. It represents the electron gain energy of a Cu⁺ ion (the reverse of the first ionization energy).

The second ionization of copper, where copper(I) loses an extra electron to become copper(II), is correctly represented by the option c) Cu+ (g) → Cu2+ (g) + e-.

The correct answer to the question of which of the following correctly represents the second ionization of copper is c) Cu+ (g) → Cu2+ (g) + e-. During the second ionization process, a copper(I) ion, also called a cuprous ion, loses an additional electron to become a copper(II) ion or cupric ion with a 2+ charge. This process can be observed in various redox reactions where copper transitions from a +1 oxidation state to a +2 oxidation state.

Answer:

C. 481 °C.

Explanation:

The amount of heat absorbed by water = the amount of heat released by copper.

Q = m.c.ΔT,

where, Q is the amount of energy.

m is the mass of substance.

c is the specific heat capacity.

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T).

∵ Q of copper = Q of water

∴ - (m.c.ΔT) of copper = (m.c.ΔT) of water

m of copper = 220.0 g, c of copper = 0.39 J/g °C, ΔT of copper = final T - initial T = 42.00 °C - initial T.

m of water = 500.0 g, c of water = 4.18 J/g °C, ΔT of water = final T - initial T = 42.00 °C - 24.00 °C = 18.00 °C.

∴ - (220.0 g)( 0.39 J/g °C)(42.00 °C - Ti) = (500.0 g)(4.18 J/g °C)(18.00 °C)

∴ - (85.8)(42.00 °C - Ti) = 37620.

∴ (42.00 °C - Ti) = 37620/(- 85.8) = - 438.5.

∴ Ti = 42.00 °C + 438.5 = 480.5°C ≅ 481°C.

So, the right choice is: C. 481 °C.

To find the volume of Leon's tire, we use the Ideal Gas Law: PV = nRT. Given the pressure, temperature, and moles of air, we calculate the volume to be approximately 53.5 liters. Therefore, the tire's volume is 53.5 liters.

Leon uses a pressure gauge to measure the air pressure in one of his car tires. The gauge shows that the pressure is 220 kilopascals. The temperature is 297 K, and the outdoor air is at standard pressure. If the tire contains 4.8 moles of air, what is the volume of the tire? The volume of the car tire is liters.

To find the volume of the tire, we can use the Ideal Gas Law: PV = nRT.

Where:

Rearranging the Ideal Gas Law to solve for V, we get:

V = nRT / P

Substitute the known values:

V = (4.8 moles) * (8.314 J/(mol·K)) * (297 K) / (220,000 Pa)

V = 11.781 / 220

V ≈ 0.0535 m³

To convert cubic meters to liters: 0.0535 m³ * 1000 = 53.5 liters

Therefore, the volume of the car tire is approximately 53.5 liters.

Answer:

A radical is a group of atoms that remains bonded together and behaves as a single atom in a chemical reaction. True (a.)

Answer:

a tree absorb as much as 48 pound of carbon dioxide per year and can sequester 1 ton of carbon dioxide by the time it reaches 40 years old

Carbon dioxide and M

ethane

Answer:

React it with CH₃MgBr and work up the product with saturated ammonium chloride solution

Explanation:

Grignard reagents convert esters into tertiary alcohols.

The general equation is

[tex]\text{RCOOR}' \xrightarrow[\text{2. H}^{+}]{\text{1. R$^{\prime \prime}$MgBr}}\text{RR$_{2}^{\prime \prime}$C-OH}[/tex]

The Grignard reagent in this synthesis is methylmagnesium bromide. You prepare it by reacting a solution methyl bromide in anhydrous ether with magnesium and a few crystals of iodine.

The reaction consumes 3 mol of CH₃MgBr per mole of dimethyl carbonate, and everything happens in the same pot.

Acid workup of the product usually involves the addition of a saturated aqueous solution of ammonium chloride and extraction with a low-boiling organic solvent.

The mechanism involves:

Step 1. Nucleophilic attack and loss of leaving group

(a) The Grignard reagent attacks the carbonyl of dimethyl carbonate, followed by (b) the loss of a methoxide leaving group.

Step 2. Nucleophilic attack and loss of leaving group

(a) A second mole of the Grignard reagent attacks the carbonyl of methyl acetate, followed by (b) the loss of a methoxide leaving group.

Step 3. Nucleophilic attack and protonation of the adduct.  

(a) A third mole of the Grignard reagent attacks the carbonyl of acetone, followed by (b) protonation of the alkoxide to form 2-methylpropan-2-ol.

The Grignard reagent serves as a very important tool in the synthesis of many other compounds.

The Grignard reagent serves as a very important tool in the synthesis of many other compounds. Grignard reagent are used in the synthesis of alcohols, ethers etc.

All the reagents and compounds required for the synthesis of 2-methyl-2-propanol via a Grignard reagent  with dimethyl carbonate  are shown in the image attached to this answer.

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To produce 43 grams of iron from the reaction Fe2O₃ + 3CO ightarrow 2Fe + 3CO₂, one would require approximately 61.48 grams of iron III oxide, following stoichiometry calculations based on molar masses and the balanced chemical equation.

To determine how many grams of iron III oxide (Fe₂O₃) are needed to make 43 grams of iron (Fe) using the reaction Fe₂O₃ + 3CO ightarrow 2Fe + 3CO₂, we will use the concept of stoichiometry. The molar mass of Fe is 55.85 grams per mole and the molar mass of Fe₂O₃ is approximately 159.69 grams per mole.

First, we need to determine the number of moles of iron that correspond to 43 grams:

Calculate moles of iron:
43 g Fe 1 mol Fe / 55.85 g Fe = 0.770 moles Fe.

Next, we use the stoichiometry of the reaction to find the moles of Fe₂O₃ needed. From the balanced equation, 1 mole of Fe₂O₃ produces 2 moles of Fe.

Calculate moles of Fe₂O₃:
0.770 moles Fe X (1 mol Fe2O3 / 2 mol Fe) = 0.385 moles Fe₂O₃.

Finally, convert the moles of Fe₂O₃ to grams:
0.385 moles Fe₂O₃ X 159.69 g Fe₂O₃/mol = 61.48 grams of Fe₂O₃ (rounded to two significant figures).

Therefore, to make 43 grams of iron, you must start with approximately 61.48 grams of iron III oxide.

Answer:

[tex]\boxed{\text{520 g H$_{2}$O}}[/tex]

Explanation:

(a) Unbalanced equation

[tex]\rm LiOH + CO$_{2} \longrightarrow \,$ Li$_{2}$CO$_{3}$ + H$_{2}$O[/tex]

(b) Balanced equation

[tex]\rm 2LiOH + CO$_{2} \longrightarrow \,$ Li$_{2}$CO$_{3}$ + H$_{2}$O[/tex]

(c) Molar masses

The only compound for which you need an atomic mass is water.

You look up the atomic masses of each element in the Periodic Table, multiply by their subscripts in the formula, and add.

[tex]\begin{array}{rcrcr}\text{2H} & = & 2 \times 1.008 & = & 2.02\\\text{1O} & = & 1 \times 16.00 & = & 16.00\\\text{H$_{2}$O} & = & & & \mathbf{18.02}\\\end{array}[/tex]

(d) Molar Ratio

You want to convert moles of carbon dioxide to moles of water.

The balanced equation tells you that the molar ratio is 1 mol H₂O:1 mol CO₂.

(e) Significant figures

The only measurement you are given is "about 650 L." That tells you that the trailing zero is not significant.

The volume has only two significant figures, so the mass of water can have only two significant figures.

Note: Intermediate calculations should carry at least one extra digit (a guard digit) to prevent cumulative round-off errors, answers to be reported must have the correct number of significant figures.

(f) The calculation

You don't give the temperature and pressure of the gas, so I shall assume STP (1 bar and 0 °C). At STP, the molar volume of a gas

is 22.71 L.

[tex]\text{Moles of CO$_{2}$} = \text{650 L CO$_{2}$} \times \dfrac{\text{1 mol CO$_{2}$}}{\text{22.71 L CO$_{2}$ }} = \text{28.6 mol CO$_{2}$}\\\\\text{Moles of H$_{2}$O} = \text{28.6 mol CO$_{2}$} \times \dfrac{\text{1 mol H$_{2}$O}}{\text{1 mol CO$_{2}$}} = \text{28.6 mol H$_{2}$O}\\\\\text{Mass of H$_{2}$O} = \text{28.6 mol H$_{2}$O} \times \dfrac{\text{18.02 g H$_{2}$O}}{\text{1 mol H$_{2}$O}} = \boxed{\textbf{520 g H$_{2}$O}}[/tex]

The mass of water produced when CO2 reacts with LiOH can be determined using the balanced chemical equation and the molar mass of the compounds.

The unbalanced chemical equation for the reaction between carbon dioxide (CO2) and lithium hydroxide (LiOH) is:
CO2 + LiOH → H2O + Li2CO3

To find the molar mass of a compound, you add up the atomic masses of each element in the compound. The molar mass of CO2 can be calculated by adding the atomic masses of carbon (12.01 g/mol) and oxygen (16.00 g/mol).

The balanced chemical equation allows you to determine the ratio of moles of reactants and products. In this case, you can see that for every 1 mole of CO2 reacted, 1 mole of H2O is produced.

The answer needs to have the same number of significant figures as the given data, which is 3 significant figures. Therefore, the mass of water produced when 650 L of CO2 reacts with LiOH is 2.35 kg.

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Answer:

The representative particle for an element is AN ATOM.

Explanation:

Representative particle of a substance refers to the smallest unit of that substance, which can not be broken down into smaller particles. The representative particles of an element is an atom, because each element is made up of atoms, which are the smallest unit of that element; they can not be broken down further.

A representative particle is chemically identical with the parent element and will have all the properties of the parent element.  

The representative particle for an element is typically the atom, for diatomic elements it's the molecule, and for ionic compounds, it is the formula unit. A mole of any substance contains 6.02 × 10²³ of these particles.

The representative particle for an element is the smallest unit in which a substance naturally exists. For most elements, this is the atom, such as iron atoms, carbon atoms, and helium atoms. However, there are seven elements that exist naturally as diatomic molecules, namely H₂, N₂, O₂, F₂, Cl₂, Br₂, and I₂, making their representative particle the molecule. Molecular compounds like H₂O and CO₂ also exist as molecules, while ionic compounds such as NaCl and Ca(NO₃)₂ are represented by formula units. Each mole of a substance contains Avogadro's number (6.02 × 10²³) of representative particles, which is key when dealing with stoichiometry in chemistry.

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Answer:

0.1 M weak acid

Explanation:

The term pH simply means power of hydrogen which is basically a log (the exponent to base 10 of the concentration) of the concentration of the hydrogen ions.

Weak acids have a higher pH since their hydrogen concentration is lower than that of strong acids.

Answer:

[tex]\boxed{\text {4.0 mol}}[/tex]

Explanation:

1 mol of Be = 9.012 g

[tex]\text{Moles of Be} = \text{36 g Be} \times \dfrac{\text{1 mol Be}}{\text{9.012 g Be}} = \text{4.0 mol Be}\\\\\text{There are }\boxed{\textbf{4.0 mol Be}} \text{ in 36 g of Be}[/tex]

Answer: Option (b) is the correct answer.

Explanation:

It is known that number of moles of a substance is equal to the given mass of the substance divided by its molar mass.

Mathematically,   Number of moles = [tex]\frac{mass}{/text{\molar mass}}[/tex]

Molar mass of beryllium is 9 g/mol. Hence, putting the given values into the above formula as follows.                

 Number of moles = [tex]\frac{mass}{/text{\molar mass}}[/tex]                

                               = [tex]\frac{36}{9 g/mol}[/tex]

                               = 4 moles

Thus, we can conclude that the number of moles present in 36 grams of Be are 4 moles.

Answer:

once they are leaked into the environment, could cause serious health hazards to all living organisms

Answer:

can do all of these

Explanation:

A radioactive material may exist in any given state of matter; solid, liquid or gas. Some radioactive materials have very long half lives. Half life refers to the period of time it takes for the amount of radioactive material in a sample to decrease by half of its original content of radioactive material.

Most radioactive materials produce ionizing radiation which causes ill effects on human and animal cells.