Ethylene glycol is the main ingredient in the antifreeze that is used in car radiators because it has a low freezing point. what is the molality of a solution that will cause a 8.26 â°c change in the freezing point of water? (kf of water = 1.86 kg/molâ°c, i=1).

Considering the given reaction, 109 g of Fe are needed to generate 5.25 g of H₂.

Stoichiometry refers to the relationship between the quantities of reactants and products before, during, and following chemical reactions.

3 Fe + 4 H₂O ⇒ 4 H₂ + Fe₃O₄

We will consider the following relationships.

\(5.25gH_2 \times \frac{1molH_2}{2.02gH_2} \times\frac{3molFe}{4molH_2} \times\frac{55.85gFe}{1molFe} = 109gFe\)

Considering the given reaction, 109 g of Fe are needed to generate 5.25 g of H₂.

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Answer

D

Explanation:

They take up usable forms of nitrogen found in soil

Answer:

d

Explanation:

i took the test

Answer:

The telescope

Explanation:

Answer:

The words I think of when I hear philosophies are knowledge and reasoning.

Explanation:

So, if you have seen other responses, you would see "love of wisdom." But, there is more to it. When someone says the philosophy usually, someone would think of knowledge or reasoning. When you reason, you reflect, learn, and form opinions using methods of philosophy. So when doing this, you can reason with someone. You could also have "reasoning" with an object or when having a conversation.

You can have an emphasis and an impact when knowing, supported with reasoning. Even though the definition of wisdom, the quality of having expertise, "knowledge" and good judgment; the quality of being wise, wisdom arises from wise-dom, and which is a synonym to philosophy. When your wise and have "knowledge" you, "know something."

When you think of philosophy, the study of the intellectual foundation of a department of knowledge or expertise, you assume that it's wise, or wise-dom, but no. Love of wisdom originates from, "The feeling of love in being wise." As a result, you could tell that philosophy is the love of being wise. Being wise has a reasoning behind it. There is a reason to be wise. People want to be smart and be intelligent for a reason. You want to be a unique person and want to have a justification in a section of experience.

When thinking of it, it's like you are studying knowledge. You are not practicing wisdom. You can't practice being a wise person. It comes with being a Christian or being in that culture, or whatsoever. But you can study knowledge. Each mindset comes with being or "knowing" something. When thinking about each decision, you have to have reasoning behind it.

So, when you consider philosophy, think of "the" philosophy, the roots of it. You have to have a reason to back it up, with reasoning and details. You become a person who displays knowledge. You do not show wisdom through a philosophy. With being wise, you only know certain things. With the information, you know it all. With reasons you don't just have back up you have everything.

₁H, ₂H and ₃H are examples of are isotopes.

Isotopes are  or more styles of atoms that have the same atomic range and role in the periodic desk, and that vary in nucleon numbers due to special numbers of neutrons of their nuclei.

An isotope is certainly one of two or more varieties of the identical chemical detail. Specific isotopes of an element have the equal range of protons in the nucleus, giving them the identical atomic variety, however a specific quantity of neutrons giving every elemental isotope a exceptional atomic weight.

Like the whole lot we see within the world, isotopes are a type of atom, the smallest unit of depend that keeps all the chemical properties of an element. Isotopes are sorts of a chemical detail with precise residences.

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Answer:

Physical

Explanation:

Physical weathering is defined as the geological process in which rocks are broken down but there is no change in their chemical composition.

Granite tor are the rock masses above the ground surface which are  associated with granites

Granite Tor is an example of physical weathering as they formed by freeze–thaw weathering. Granite tor are formed when magma present in the crust cools down and form batholith. Rocks above batholith gets erodes and left the batholith to expose.

Hence, the correct answer is "Physical weathering'.

It should be noted that 8.0 grams of ammonium nitrite must have reacted to produce 2.58 L of nitrogen gas.

We can use the ideal gas law to calculate the number of moles of nitrogen gas produced:

PV = nRT

Solving for n, we get:

n = PV/RT = (97.8 kPa)(2.58 L)/(8.314 J/mol K)(294.15 K)

= 0.125 mol

Since 1 mole of ammonium nitrite produces 1 mole of nitrogen gas, the mass of ammonium nitrite that reacted is:

mass = moles * molar mass = 0.125 mol * 64.01 g/mol

= 8.0 g

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Answer:

The relative atomic mass of the metal is  207.2 u

Explanation:

Metal chromate

Given that;

1) The mass of fluorine is 14.96% of the metal fluoride

2) 2 Chromium are connected to the metal when the metal chromate, CrO²⁻, is formed

We have;

Number of ions available in the metal =  Cr₂O₇²⁻ = +2 ionic

Molar mass of fluorine = 18.998 g/mole

Ionization of fluorine = -1

Number of moles of fluorine required per metal +2 ion= 2 moles

3) Number of moles of fluorine per mole of compound of the metal fluoride = 2 × moles

Mass of fluorine per mole of compound = 2 × 18.998 = 37.996 grams

Percentage by mass of fluorine = 14.96%

Fluoride

Let the mass of the compound = X

Therefore;

14.96% of X = 37.996 grams

X = 37.996/(0.1496) = 253.984 grams

Therefore the mass of the metal in the compound = 253.984 - 37.996 = Molar mass 215.99 grams

Given that the metal forms a chromate with 2 chromium atoms and a mass of 215.99 grams, the likely candidate is lead, Pb with a molar mass of 207.2 grams and a chromate of Pb(CrO₄)₂.

The fluoride, lead fluoride, F₂

The relative atomic mass of lead is 207.2 u

Answer:

Arsenic, As, has atomic number 33, which is the number of protons in the nuclei of its atoms. A neutral As atom would also have 33 electrons. The electron configuration of a neutral arsenic atom is [Ar]3d104s24p3

Explanation:

Answer:

0.018 grams

Explanation:

The number of moles (n) in such number of atoms of Aluminum must be calculated by dividing the number of atoms (nA) by Avagadro's number i.e.

n = nA ÷ 6.02 × 10^23atoms

The number of atoms of Aluminum in this question has been given as: 3.99 x 10^20 atoms.

n = 3.99 x 10^20 ÷ 6.02 × 10^23

n = 3.99/6.02 × 10^(20-23)

n = 0.663 × 10^-3

n = 0.000663moles

Next, we convert the mole value to mass in grams by using the formula;

mole = mass/molar mass

mass = mole × molar mass

Molar mass of Al = 27g/mol

mass (g) = 0.000663 × 27

mass = 0.0179

mass of Aluminum is 0.018grams

The balanced redox reaction in a basic solution is:

\(3Cu^{+}(aq) + CrO_{4}^{2-}(aq) + 8OH^{-}(aq)\) → \(3Cu^{2+}(aq) + Cr(OH)_{3}(s) + 4H_{2}O(l)\)

We first split the reaction into two half-reactions: oxidation and reduction.

Oxidation half-reaction: \(Cu^{+}\) → \(Cu^{2+}\)

Reduction half-reaction: \(CrO_{4}^{2-}\)→ \(Cr(OH)_{3}\)

We balance the oxygen atoms by adding \(H_{2}O\) to the side lacking oxygen.

Oxidation half-reaction:: \(Cu^{+}\) → \(Cu^{2+}\)

Reduction half-reaction: \(CrO_{4}^{2-} + 4H_{2}O\) → \(Cr(OH)_{3}\)

We then balance the hydrogen atoms by adding OH^{-} ions to the side having less hydrogen.

Oxidation half-reaction : \(Cu^{+}\) → \(Cu^{2+}\)

Reduction half-reaction: \(CrO_{4}^{2-} + 4H_{2}O + 8OH^{-}\)→ \(Cr(OH)_{3}\)

We equalize the charge of each half-reaction by adding electrons.

Oxidation half-reaction : \(Cu^{+}\) → \(Cu^{2+}+ e-\)

Reduction half-reaction: \(CrO_{4}^{2-} + 4H_{2}O + 8OH^{-} + 3e-\) → \(Cr(OH)_{3}\)

We then multiply each half-reaction by 3 to equalize the no. of electrons in both half-reactions.

Oxidation half-reaction: \(3Cu^{+}\)→ \(3Cu^{2+} + 3e-\)

Reduction half-reaction: \(CrO_{4}^{2-} + 4H_{2}O + 8OH^{-} + 3e-\) → \(Cr(OH)_{3}\)

Finally, we add the two half-reactions together, canceling out common species on each side.

\(3Cu^{+} + CrO_{4}^{2-} + 4H_{2}O + 8OH^{-}\)→ \(3Cu^{2+} + Cr(OH)_{3}\)

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The balanced chemical equation for the reaction of hydrobromic acid (HBr) with a solution of calcium hydroxide (Ca(OH)2) can be represented as \(2HBr+Ca(OH)_{2} - > CaBr_{2}+2H_{2}O\)

In this reaction, hydrobromic acid, which is a strong acid, reacts with calcium hydroxide, which is a strong base, to form calcium bromide and water.

The reaction can be understood by considering the acid-base neutralization process. Hydrobromic acid donates a proton (H+) to the hydroxide ion (OH-) from calcium hydroxide. This results in the formation of water (H2O) and calcium bromide (CaBr2).

The balanced equation shows that 2 moles of hydrobromic acid react with 1 mole of calcium hydroxide, producing 1 mole of calcium bromide and 2 moles of water. The coefficients in the balanced equation indicate the stoichiometric ratio of the reactants and products.

Overall, the balanced equation accurately represents the reaction between hydrobromic acid and a solution of calcium hydroxide, highlighting the formation of calcium bromide and water as the products.

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Keep in mind that this is a simplified approach, and there may be exceptions or complications depending on the specific molecule and its geometry.

What is Hybridization?

In chemistry, hybridization is the process of combining atomic orbitals to form new hybrid orbitals with different properties than the original atomic orbitals. This concept is used to explain the geometry and bonding properties of molecules.

In hybridization, the valence electrons of an atom are rearranged to form hybrid orbitals that can participate in covalent bonding. The new hybrid orbitals are formed by mixing together atomic orbitals of similar energy, such as s, p, and d orbitals.

The hybridization of the central atom in a molecule can be predicted using the following steps:

Count the number of electron pairs around the central atom, including both bonding and lone pairs.

Use the electron pair geometry to determine the hybridization of the central atom, based on the following guidelines:

For two electron pairs, the hybridization is sp.

For three electron pairs, the hybridization is sp2.

For four electron pairs, the hybridization is sp3.

For five electron pairs, the hybridization is sp3d.

For six electron pairs, the hybridization is sp3d2.

Keep in mind that this is a simplified approach, and there may be exceptions or complications depending on the specific molecule and its geometry.

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The new element is most likely to belong to Group 1 of the periodic table, also known as the alkali metals, based on the characteristics the scientist cited.

First off, because the element has been classified as a metal, it is more likely to be found on the left side of the periodic table. Metals typically have a bright look, are malleable and ductile, and are good conductors of heat and electricity. The scientist's list of characteristics is matched by the softness and high reactivity of alkali metals in particular.

The second observation made by the scientist is that the new element has a high water reactivity. The alkali metals are noted for their ferocious reactions with water, which result in the production of hydrogen gas and an alkaline solution. Furthermore exothermic, this reaction generates a substantial amount of heat.

Overall, it makes sense to include the new element in Group 1 of the periodic table, along with other alkali metals like lithium, sodium, and potassium, based on the scientist's list of attributes. This arrangement would be consistent with both the new element's water reactivity and the known characteristics of the alkali metals.

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Answer:

3.7 mL

Explanation:

Step 1: Given data

Volume of water before the chalk is added: 8.7 mL

Volume of water after the chalk is added: 12.4 mL

Volume of the chalk: ?

Step 2: Calculate the volume of the chalk

The volume of the chalk is equal to the volume of water after the chalk is added minus the volume of water before the chalk is added.

V = 12.4 mL - 8.7 mL = 3.7 mL

0.3 moles of Oxygen is excess reactant (reagent) when yield is 100% .

NO =5.6 moles

O2= 3.1 moles

2NO + O2 --> 2NO2 the chemical reaction.

the ratio of NO and O2 is 2:1

therefore for 5.6 moles of NO, 2.8 moles of Oxygen(O2) is required. So 3.1moles - 2.8 moles = 0.3 moles

The reactant in a chemical reaction that is present in a quantity that is larger than what is required to fully react with the limiting yield is known as the excess reactant. The substance(s) still present after a chemical reaction has reached equilibrium in yield are the reactant(s). Subtract the mass of excess reagent eaten from the total mass of excess reagent provided to determine the quantity of yield that is still present. Reactants in a chemical reaction are referred to as excess reagents if they are still present after the reaction is complete.

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Answer:

negative charge

Explanation:

An anion has more electrons than protons, consequently giving it a net negative charge.

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a minimum of three seismograph stations are needed to find an earthquake's epicenter using the S-P time method.

Scientists use triangulation to find the epicenter of an earthquake. When seismic data is collected from at least three different locations, it can be used to determine the epicenter by where it intersects. ... Knowing this helps them calculate the distance from the epicenter to each seismograph.

Explanation:

Answer:

Kinetic energy

Explanation:

This is the energy possessed by a moving object.

The value of activation energy for the reaction in kJ/mol is obtained by using the Arrhenius equation.

Activation energy is represented by E_a, the frequency factor is represented by A, the gas constant is represented by R, the temperature is represented by T, and the rate constant is represented by k.

According to the Arrhenius equation

ln k = (- E_a/ R) + ln

Taking the exponential A of both sides

k = Ae^(-Ea/RT)k = A × e^(-Ea/RT)

Taking natural logarithms on both sides, we obtain;

ln k = ln A + (-Ea/RT)

If we consider a plot of ln k vs. 1/T, the equation becomes

y = mx + Cln k = (-Ea/R) (1/T) + ln A

From this equation, we can see that the slope of the best-fit line is -Ea/R.

Therefore, by using the slope value of the best-fit line as -2475 k, the activation energy is obtained by rearranging the above equation as; Ea = -slope x R= (-2475 k) × (8.314 J mol^−1 K^−1)≈ 20.5 kJ/mol

Therefore, the value of the activation energy for the reaction in kj/mol is approximately equal to 20.5 kJ/mol.

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Boyle's law, named after the scientist Robert Boyle, states that at a constant temperature, the pressure and volume of a gas are inversely proportional to each other. This means that as the pressure of a gas increases, its volume decreases, and vice versa, as long as the temperature remains constant.

a. Using Boyle's law, which states that the product of the initial pressure and volume of a gas is equal to the product of its final pressure and volume at constant temperature.

P1V1 = P2V2

0.82 atm x 2.0 L = P2 x 1.0 L

P2 = (0.82 atm x 2.0 L) / 1.0 L = 1.64 atm

Therefore, the missing value is P2 = 1.64 atm.

b. Using Charles's law, which states that the volume of a gas at constant pressure is directly proportional to its absolute temperature.

V1/T1 = V2/T2

(250 mL)/T1 = (400 mL)/(298 K)

T1 = (250 mL x 298 K) / 400 mL = 186.5 K

Therefore, the missing value is T1 = 186.5 K.

c. Using Gay-Lussac's law, which states that the pressure of a gas is directly proportional to its absolute temperature at constant volume.

P1/T1 = P2/T2

(740 mm Hg)/T1 = P2/(298 K)

P2 = (740 mm Hg x 298 K) / T1

We also know that the initial and final volumes are not equal, so the gas is not isochoric (constant volume), and therefore we can't use Boyle's law.

Let's assume that the temperature is measured in Kelvin, so T1 = T2 + 273.15 K

P2 = (740 mm Hg x 298 K) / (T2 + 273.15 K)

P2 = (740 mm Hg x 298 K) / (0.8 L x 273.15 K / 0.55 L)

P2 = (740 mm Hg x 298 K x 0.55 L) / (0.8 L x 273.15 K)

P2 ≈ 460 mm Hg

Therefore, the missing value is P2 = 460 mm Hg.

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1. Arrhenius Base - (F) produces hydroxide ions in water, 2. Lewis Base - (A) electron pair donor, 3. Arrhenius Acid - (C) produces hydronium ions in water, 4. Lewis Acid - (D) electron pair acceptor, 5. Bronsted-Lowry Base - (B) proton acceptor and 6. Bronsted-Lowry Acid - (E) proton donor

An Arrhenius base is a substance that produces hydroxide ions (OH−) in an aqueous solution. This increases the concentration of hydrogen ions (H+) in the same solution, thereby making the solution more basic. The Arrhenius theory of electrolytes states that all bases dissociate into positively-charged cations (H+) and negatively-charged anions (OH−) when dissolved in water. This dissociation is known as the Arrhenius equation. Common examples of Arrhenius bases include calcium hydroxide, sodium hydroxide, potassium hydroxide, and ammonium hydroxide. These bases are used in a variety of industrial, medical, and scientific applications, such as pH regulation, neutralization of acids, and production of dyes and drugs. Arrhenius bases are important components of many chemical reactions and are often used in the production of cleaning solutions, medicines, and cosmetics.

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Atoms are the individual particles that make up all matter, while molecules are formed when atoms combine together through chemical bonding. There are 6 atoms in NH₄Cl and 5 atoms in CaClO₃.

Atoms are the basic building blocks of matter. They are the smallest units of an element that retain the chemical properties of that element. Atoms consist of a nucleus containing positively charged protons and neutral neutrons, surrounded by negatively charged electrons in energy levels or shells.

Molecules, on the other hand, are formed when two or more atoms chemically bond together. They can be made up of atoms of the same element or different elements. Molecules can exist as discrete units and can have distinct chemical and physical properties. Examples of molecules include water (H2O), carbon dioxide (CO2), and glucose (C6H12O6).

Therefore, there are 6 atoms in NH₄Cl and 5 atoms in CaClO₃ as listed in the table attached.

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Answer:

c

Explanation:

Soil, Plants get energy from the sun.. Answer is C.

Answer:

B. trees

Explanation:

A biotic factor is something in an environment or ecosystem that is living. For example, plants and animals are biotic factors. An abiotic factor is just the opposite-they are not living. Rocks and water are examples of abiotic factors.

Soil composition, temperature and sunlight are all not alive. Therefore, they must be abiotic factors.

Trees are living organism. This means that they are biotic factors. So, the correct answer is B: trees.

The given reaction is already balanced, that is to say tha the number of atoms in the reactants matches the number of atoms in the products. In the reaction, we can see the relationship between CaC2 and H2O. For each mole of CaC2 two moles of H2O react.

So, if 4.8 moles of CaC2 are consumed the moles of H2O needed will be:

Mol of H2O = Mol of CaC2 x 2

Mol of H2O = 4.8 x 2 = 9.6 mol of H2O

Now, to calculate the grams of H2O we will use the following equation and the mass molar of H2O.

Mass molar of H2O =18.01 g/mol

So, if 4.8 moles of CaC2 are consumed in this reaction, 172.9 g of H2O are needed

Answer:

A a metal such as copper

Explanation:

Answer:

A metal such as copper, because its atoms have very mobile electrons

Explanation:

You must go to the mountain or apraturakados to answer this question. It will be a daring adventure, but the journey will be worth it. Good luck, student.

The actual answer is 7.58, sorry...

When A solution at 25 degrees Celsius has a pOH of 6.42. So here the pH of the solution is 7.58.

Since we know that

pH + pOH = 14

here

pOH is 6.42

So,

pH = 14 - pOH

= 14 - 6.42

= 7.58

hence, When A solution at 25 degrees Celsius has a pOH of 6.42. So here the pH of the solution is 7.58.

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