A saturated Na₂CO₃ solution is prepared, and a small excess of solid is present (white pile in beaker). A seed crystal of Na₂¹⁴CO₃ (¹⁴C is a radioactive isotope of ¹²C) is added (small red piece), and the radioactivity is measured over time.
(b) Would you expect radioactivity in all the solid or just in the seed crystal? Explain.

Answer:

Explanation:

In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.

X-rays are neutral and cannot be bent in a magnetic field. The new radiation was bent by the magnetic field so that the radiation must be charged and different than x-rays.

To combine ions to form ionic compounds, we need the combine in such a way that it gets neutral charge.

We can combine each anion with each cation to get the 4 compounds we need.

To combine SO₄²⁻ with Pb⁴⁺ we first find the Least Common Multiple of their charges, 2 and 4.

They have the factor 2 in common, so the LCM is 4. This is the final charge of each that will cancel out.

To get 4+, we only need 1 Pb⁴⁺.

To get 4-, we need 2 SO₄²⁻.

So, the formula is:

Pb(SO₄)₂

To combine SO₄²⁻ with NH₄⁺ is easier because one of them has single charge. In this case, we can simply pick one of the multiple charge ion and the same amount that will cancel its charge of the single charged one.

So, we picke 1 SO₄²⁻, ending with 2-.

And we picke 2 NH₄⁺, ending with 2+.

The formula:

(NH₄)₂SO₄

To combine C₂H₃O₂⁻ with Pb⁴⁺ we do the same, because the anion is single charged.

Pick 1 Pb⁴⁺, ending with 4+.

Pick 4 C₂H₃O₂⁻, ending with 4-.

The formula:

Pb(C₂H₃O₂)₄

To combine C₂H₃O₂⁻ with NH₄⁺, both have same charge, so we just need one of each and their charges will cancel out.

The formula:

NH₄C₂H₃O₂

So, the formulas are:

Pb(SO₄)₂

(NH₄)₂SO₄

Pb(C₂H₃O₂)₄

NH₄C₂H₃O₂

20 mL of 0.170 M NaOH solution is required to neutralize 20 mL of 0.170 M HCl solution.

To determine the volume of 0.170 M NaOH solution required to neutralize 20 mL of a 0.170 M HCl solution, we can use the equation:

moles of acid = moles of base

First, let's calculate the number of moles of HCl in 20 mL of the solution:

moles of HCl = (0.170 mol/L) x (20 mL / 1000 mL/L) = 0.0034 mol

Since the neutralization reaction between HCl and NaOH has a 1:1 stoichiometry, we know that 0.0034 mol of NaOH will be required to completely neutralize the HCl.

Next, we can use the concentration of the NaOH solution to determine the volume required:

moles of NaOH = 0.0034 mol

Molarity of NaOH = 0.170 M

Volume of NaOH = moles of NaOH / Molarity of NaOH = 0.0034 mol / 0.170 mol/L = 0.02 L or 20 mL

Therefore, 20 mL of 0.170 M NaOH solution is required to neutralize 20 mL of 0.170 M HCl solution.

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Answer: Based on the description provided, it sounds like the volcano in question is a stratovolcano, also known as a composite volcano.

Explanation:

Stratovolcanoes are characterized by having viscous magma that can produce pyroclastic flows (flows of hot ash, gas, and rock) and are made up of layers of ash, lava, and rock. Stratovolcanoes are often cone-shaped and can be quite tall. They are formed through the accumulation of material ejected during eruptions, and they are typically found along plate boundaries where tectonic plates are converging. Some well-known examples of stratovolcanoes include Mount St. Helens, Mount Fuji, and Mount Vesuvius.

LPG is composed hydrocarbons containing three or four carbon atoms. The normal components of LPG thus, are propane (C3H8) and butane (C4H10). Small concentrations of other hydrocarbons may also be present.

Answer:

Its actually Q = 103.2 J

Explanation:

From the combustion of 0.100 mol pentane,  0.600 moles of water are produced.

To determine the moles of water produced from the combustion of 0.100 mol pentane (C5H12), we first need to write the balanced chemical equation for the reaction:

C5H12 + 8O2 → 5CO2 + 6H2O

Now, let's use the stoichiometry of the reaction to find the moles of water produced:

1. Identify the mole ratio between pentane and water from the balanced equation: 1 mol C5H12 : 6 mol H2O
2. Use this ratio to calculate the moles of water produced:
(0.100 mol C5H12) × (6 mol H2O / 1 mol C5H12) = 0.600 mol H2O

So, 0.600 moles of water are produced from the combustion of 0.100 mol pentane.

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Answer:

A) The mass would be the same.

Explanation:

Since there is no loss of any particle to vapor during the phase change process from solid to liquid, the mass of the before and after the process will remain the same.

Answer:

be the same

Explanation:

Answer:

The molecular shape of hydrogen sulfide is bent.

Explanation:

The central atom sulfur is bonded to two hydrogen atoms. Sulfur can form two bonds following the octet rule.

The molecular geometry of H2S is bent shape or V-shape.

Hydrogen sulphide has a structure that is comparable to water's. A mixture of two hydrogen atoms and one sulphur atom makes up the Lewis structure of hydrogen sulphide. The main particle, sulphur, is composed of two lone hydrogen atoms that are joined together by a single bond.

Six valence electrons make up sulphur, and two of those are used to create the two S–H bonds. Two lone pairs are now left, which crowd and repel the bonding electrons to prevent them from forming a linear structure. Since there are 92 degrees between the two SH bonds, the form is a "V."

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Answer:

answer is b

Explanation:

I think it is b. I don't know what land lenses are but focusing light on the can would heat it up more.

The volume of the gas in the truck tire is approximately 44.2 L.

The ideal gas law equation can be used to solve for the volume of the gas in the tire:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas.

Substituting the given values into the equation, we get:

(2.1 atm)(V) = (1.85 mol)(0.08206 L atm/mol K)(300 K)

Solving for V, we get:

V = (1.85 mol)(0.08206 L atm/mol K)(300 K)/(2.1 atm) ≈ 44.2 L

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Answer:

3 NH4OH (l) + H3PO4 (aq) → (NH4)3PO4 (aq) + 3 H2O (l)

Explanation:

This is an acid-base reaction (neutralization): NH4OH is a base, H3PO4 is an acid

Answer:

To balance the equation place a coefficient 3 in front of NH4OH in the reactants and another 3 in front of H2O.

3 NH4OH (l) + H3PO4 (aq) → (NH4)3PO4 (aq) + 3 H2O (l)

Explanation:

To balance equations you are only allowed to change coefficients and not subscripts. You need to make sure you have the same amount of each element on both sides of the equation, sketching a table may help.

The main parameter that determines the mechanical properties of concrete is the water-to-cement ratio.

The weight ratio of water to cement used in concrete is referred to as water-to-cement ratio. It is a significant element that affects the hardened concrete's overall performance, strength, and durability. In the hydration process of cement, where water chemically combines with the cement particles to form a firm matrix, the ratio is crucial. Because appropriate hydration and a higher density of the cementitious paste are ensured by a lower water-to-cement ratio, the resulting concrete is stronger and more resilient.

The cement particles can pack together more tightly and produce a denser, stronger structure by lowering the amount of water in the mixture. On the other side, a higher water to cement ratio causes the concrete to be more porous, have lower strength, and last less time. In order to avoid problems with workability during concrete installation or to compromise the strength and durability of the hardened concrete, it is crucial to maintain a balance between water and cement.

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The boiling point of a 1.58 m aqueous solution of CaCl2 is approximately 102.4352 °C.

The boiling point of a 1.58 m aqueous solution of CaCl2 can be calculated using the equation for boiling point elevation. The boiling point elevation is a colligative property, meaning it depends on the concentration of solute particles rather than the identity of the solute. In this case, the solute is CaCl2, which dissociates into three ions: one Ca2+ ion and two Cl- ions.

The boiling point elevation equation is ΔTb = Kb * m * i, where ΔTb is the boiling point elevation, Kb is the molal boiling point elevation constant, m is the molality of the solution, and i is the van't Hoff factor, which represents the number of particles formed when the solute dissociates. For CaCl2, i = 3 because it dissociates into three ions. The molality of the solution is given as 1.58 m. The molal boiling point elevation constant for water is typically around 0.512 °C/m.

Plugging in the values, we can calculate the boiling point elevation: ΔTb = 0.512 °C/m * 1.58 m * 3 = 2.4352 °C. To find the boiling point of the solution, we add the boiling point elevation to the normal boiling point of water, which is 100 °C: Boiling point = 100 °C + 2.4352 °C = 102.4352 °C.

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Answer:

0.468 m

Explanation:

From the question given above, the following data were obtained:

Mass of napthalalene (C₁₀H₈) = 30 g

Mass of toulene = 500 g

Molality =?

Next, we shall determine the number of mole in 30 g of C₁₀H₈. This can be obtained as follow:

Mass of C₁₀H₈ = 30 g

Molar mass of C₁₀H₈ = (12×10) + (8×1)

= 120 + 8

= 128 g/mol

Mole of C₁₀H₈ =?

Mole = mass / molar mass

Mole of C₁₀H₈ = 30 / 128

Mole of C₁₀H₈ = 0.234 mole

Next, we shall convert 500.0 g of toulene to Kg. This can be obtained as follow:

1000 g = 1 Kg

Therefore,

500 g = 500 g × 1 Kg / 1000 g

500 g = 0.5 Kg

Finally, we shall determine the molality of the solution. This can be obtained as follow:

Mole of solute (C₁₀H₈) = 0.234 mole

Mass of solvent (toulene) = 0.5 Kg

Molality =?

Molality = mole of solute / Kg of solvent

Molality = 0.234 / 0.5

Molality = 0.468 m

Answer:

See Explanation

Explanation:

Let us consider the first two reactions, the initial concentration of CO was held constant and the concentration of Hbn was doubled.

2.68 * 10^-3/1.34 * 10^-3 = 6.24 * 10^-4/3.12 * 10^-4

2^1 = 2^1

The rate of reaction is first order with respect to Hbn

Let us consider the third and fourth reactions. The concentration of Hbn is held constant and that of CO was tripled.

1.5 * 10^-3/5 * 10^-4 = 1.872 * 10^-3/6.24 * 10^-4

3^1 = 3^1

The reaction is also first order with respect to CO

b) The overall order of reaction is 1 + 1=2

c) The rate equation is;

Rate = k [CO] [Hbn]

d) 3.12 * 10^-4 = k [5 * 10^-4] [1.34 * 10^-3]

k = 3.12 * 10^-4  /[5 * 10^-4] [1.34 * 10^-3]

k = 3.12 * 10^-4/6.7 * 10^-7

k = 4.7 * 10^2 mmol-1 L s-1

e) The reaction occurs in one step because;

1) The rate law agrees with the experimental data.

2) The sum of the order of reaction of each specie in the rate law gives the overall order of reaction.

Volume of 2 L soda bottle contain 0.091 ounce mass of air.

Volume given 2 L

and, We know that density of air is 1.29 g/L

So, Density of air = mass of air/volume of air

Thus, 1.29 = mass of air/2

Mass of air = 2.58 g

In ounces; 1 g = 0.35 ounces

so 2.58 g = (2.58 × 0.35) ounces = 0.091 ounces

Hence volume of 2 L of soda bottle contain 0.091 ounces of mass.

What is Density ?

Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

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The amplitude of the superposition wave Ψtot is 18 (in units of V/m).

To calculate the amplitude of the superposition wave Ψtot = ψ1 + ψ2 + ψ3, we need to add the individual wave amplitudes together.

Given:

ψ1(z,t) = 5cos(kz - ωt + π/4)

ψ2(z,t) = 10cos(kz - ωt + 2π/4)

ψ3(z,t) = 3cos(kz - ωt + 3π/4)

The amplitude of a wave is the maximum displacement from the equilibrium position. In the case of a cosine function, the amplitude corresponds to the coefficient in front of the cosine term.

For ψ1, the amplitude is 5.

For ψ2, the amplitude is 10.

For ψ3, the amplitude is 3.

To find the amplitude of the superposition wave Ψtot, we add these individual amplitudes together:

Ψtot = ψ1 + ψ2 + ψ3

= 5cos(kz - ωt + π/4) + 10cos(kz - ωt + 2π/4) + 3cos(kz - ωt + 3π/4)

Since the amplitudes are constant, we can simply add them:

Amplitude of Ψtot = 5 + 10 + 3

= 18

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Malonic acid completely dissolves but partially dissociates in aqueous solutions.

Malonic acid (propanedioic acid) is a dicarboxylic acid. The molecular formula of malonic acid is C3H4O4, and it has a molar mass of 104.07 g/mol. It is a white crystalline solid, soluble in water and other polar solvents.

Malonic acid dissolves in aqueous solutions to produce a homogeneous solution. Although malonic acid does not completely dissociate in water, it partially dissociates into H+ and Hmal in the presence of water. Malonic acid is a weak acid; thus, only a few molecules of malonic acid ionize in an aqueous solution.

Hence, it only partially dissociates. Therefore, it can be said that Malonic acid completely dissolves but partially dissociates in aqueous solutions.

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In the given reaction: Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g) The correct statement about the reaction is: B) H is the reducing agent because it loses electrons.

Let's break down the given reaction and analyze the oxidation and reduction processes involved.

The reaction is: Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g)

In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to produce magnesium chloride (MgCl) and hydrogen gas (H2).

To determine the oxidizing and reducing agents, we need to identify the species undergoing oxidation and reduction by looking at the changes in their oxidation states.

Oxidation involves an increase in oxidation state, while reduction involves a decrease in oxidation state.

Let's examine the oxidation states of the relevant elements:

Now, let's analyze the reaction:

Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g)

Based on these observations, we can conclude the following:

Therefore, the correct statement is:

B) H is the reducing agent because it loses electrons.

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Answer

Provide the body with the calories, or energy, to grow as well.

Answer: B

Explanation:

There is an atom of one type of element and then two atoms of another type of element.

Answer:

It is a Mixture

Explanation:

It's a mixture because it was a substance made from mixing other substances together. And when the magnet went over the powder, the iron  is lifted and not the sulfur. So the different parts of it can be separated by any physical means that allows the parts to seen separated

Answer:

its is a mixture

Explanation: because I did the question

The structures of the two intermediates and the final product of the Grubbs catalysis reaction are shown in the attached image, with emphasis on the stereochemistry of the two intermediates and the end product.

Intermediates are those species which are formed during the process of any chemical reaction which in turn finally converts into products.

Stereochemistry is a discipline of chemistry that studies the three-dimensional structure of molecules and how it influences their physical and chemical properties.

According to the question it is discussing about the Grubbs catalysis reaction which is a transition metal carbene series complex in which mixture of two optical active compounds are obtained which are the intermediates which finally gives product after reduction.

Hence the required structures are shown in the attached image.

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Answer:the parts of the body which is nearest to  the ground ie thier back will show discoloration

Explanation:

If the body remains at a position for long hours, the parts of the body which is nearest to  the ground can develop a skin discoloration as a result of pooling of blood in the tissues and this is called livor mortis, which tends to be permanent from 8Hours upwards.

The volume of C₂H₂ : 28 L

Given

45g of water

Required

The volume of C₂H₂

Solution

Reaction

CaC₂(s) + 2 H₂O(l) ⇒ C₂H₂(g) + Ca(OH)₂(aq)

mol of water (MW = 18 g/mol) :

mol = mass : MW

mol = 45 g : 18 g/mol

mol = 2.5

From equation, mol ratio H₂O : C₂H₂ = 2 : 1, so mol C₂H₂ :

= 0.5 x mol H₂O

= 0.5 x 2.5

= 1.25

The volume of C₂H₂(assume at STP, 1 mol = 22.4 L) :

=1.25 mol x 22.4 L

=28 L

Answer: a: 0.04

b: 0

c: x

d: x

e: x

f: 0.04

Explanation:

While secondary and tertiary alcohols react using the elementary SN1 mechanism, where no carbocation is created, primary alcohols react using the SN2 mechanism, which entails the production of a carbocation.

You can tell the type of alcohol by looking at the carbon atoms connected to OH.The alcohol is classified as primary, secondary, or tertiary depending on the number of carbons that are connected to that carbon.

Alkyl groups in tertiary alcohols supply the oxygen of the alcohol with electron density, which lessens the alcohol's acidic intensity.Thus, as the number of alkyl groups attached to a alcohol functional group on carbon grows, the acidity of alcohol decreases.

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The subatomic particle is not indicated by the atomic number of a neutral atom is neutron.

The subatomic particles is the particles that atom is composed of. The subatomic particles is given as :

The atomic number of the neutral atom is equals to the number of the protons. The number of protons is equals to the number of electrons for the neutral atom. The mass number is equal to the number of protons + number of neutrons.

Thus, the number of neutrons is the subatomic particle that is not indicated by the atomic number of a neutral atom.

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Answer:

ummmm

Explanation: