1. A 99.8 mL sample of a solution that is 12.0% KI by mass (d: 1.093 g/mL) is added to 96.7 mL of another solution that is 14.0% Pb(NO3)2 by mass (d: 1.134 g/mL). How many grams of PbI2 should form?

Pb(NO3)2(aq) + 2 KI(aq) PbI2(s) + 2 KNO3(aq)

Answer: B. 4

Explanation:

Answer:

Substance B, boiling point of 105 °C

Explanation:

Non volatile substances have high boiling points

Answer: i think its A

Explanation:

Answer:

A

Explanation:

Becuase bubbles only come from chemical changes

Answer:

is c a mixture of minerals

Explanation:

Answer:

Its nitrogen

Explanation:

Answer:

Nitrogen

Explanation:

The air is made up from other things besides oxygen.

H2(g)+2ICl(g) → 2HCl(g)+I2(g)H2(g)+2ICl(g)→2HCl(g)+I2(g)

rate=k[HI][ICl]

What is Rate of Reaction?

The pace at which the products are created from the reactants in a chemical reaction is referred to as the rate of reaction. It provides some understanding of how quickly a response might occur. For instance, the combustion of cellulose in fire has a very rapid response rate and is finished in a fraction of a second.

The pace at which reactants change into products is known as the rate of reaction or reaction rate. It goes without saying that the pace at which chemical reactions take place varies greatly. While certain chemical reactions occur almost instantly, others often take time to achieve their ultimate equilibrium.

Rate of reaction=Amount of reactant used/Time taken for the                           consumption of the reactant

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Answer:

Explanation:

CH₃CHOHCOOH    ⇄    CH₃CHOHCOO⁻   +    H⁺

ionisation constant = 1.36 x 10⁻⁴ .

molecular weight of lactic acid = 90 g

moles of acid used = 20 / 90

= .2222

it is dissolved in one litre so molar concentration of lactic acid formed

C = .2222M

Let n be the fraction of moles ionised  

CH₃CHOHCOOH    ⇄    CH₃CHOHCOO⁻   +    H⁺

C  - nC                                          nC                  nC

By definition of ionisation constant Ka

Ka = nC x nC / C - nC

= n²C ( neglecting n in the denominator )

n² x .2222 = 1.36 x 10⁻⁴

n = 2.47  x 10⁻²

nC = 2.47  x 10⁻² x .2222

= 5.5 x 10⁻³

So concentration of hydrogen or hydronium ion = 5.5  x 10⁻³ g ion per litre .

The concentration of hydrogen or hydronium ion = 5.5  x 10⁻³ g ion per liter .

Ionization of lactic acid can be represented as:

CH₃CHOHCOOH⇄ CH₃CHOHCOO⁻  + H⁺

Given:

ionization constant = 1.36 x 10⁻⁴

mass= 20.0 g

Now, Molecular weight of lactic acid = 90 g

\(\text{Number of moles}=\frac{20}{90} =0.22mol\)

It is dissolved in 1.00L so molar concentration of lactic acid formed will be

C = 0.22M

Consider "n" to be the fraction of moles ionized  

CH₃CHOHCOOH    ⇄    CH₃CHOHCOO⁻   +    H⁺

C  - nC                                          nC                  nC

By definition of ionization constant Ka

\(K_a =\frac{nC*nC}{C-nC}\)

\(K_a= n^2C\) ( neglecting n in the denominator )

On substituting the values we will get:

\(n^2 *0.22 = 1.36 *10^{-4}\\\\n = 2.47 * 10^{-2}\)

To find the concentration of hydronium ion in the solution,

\(nC = 2.47 *10^{-2} *0.22\\\\nC= 5.5 * 10^{-3}\)

So, concentration of hydrogen or hydronium ion = 5.5  x 10⁻³ g ion per liter.  

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The complete and balanced equation of the single replacement reaction would be \(Zn (s) +2 H_2O (l) --- > Zn(OH)_2 (s) + H_2 (g)\)

Solid zinc metal reacts with liquid water to produce hydrogen gas and zinc hydroxide precipitate as follows:

Formula for solid zinc metal = Zn (s)

Formula for liquid water = H2O (l)

Formula for zinc hydroxide precipitate =Zn(OH)2 (s)

Formula for hydrogen gas = H2 (g)

Combining all the components together, the overall equation of the reaction would become:

\(Zn (s) +2 H_2O (l) --- > Zn(OH)_2 (s) + H_2 (g)\)

In other words, the complete equation for the single replacement reaction illustrated would be  \(Zn (s) +2 H_2O (l) --- > Zn(OH)_2 (s) + H_2 (g)\).

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Answer:

C

Explanation:

that is the only dependent variable

The heat capacity of a substance or system is defined as the amount of heat required to raise the temperature through 1°C. It is an extensive property and its value depends on the quantity of matter present.

The heat needed to raise the temperature of 1 gram of the substance through 1°C is the specific heat capacity.

Heat required is:

q = mc (T₂ - T₁)

m = V × ρ

q = (130 + 130) × 1.0 × 4.18 ( 30.5 - 21.8) = 9455.16 J

9455.16 J = 9.45516 kJ

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Actually Welcome to the concept of Physical chemistry, and Stochiometry.

So we balance the equation as,

2Na + Cl2 ===> 2NaCl

The required reaction is as:

2Na+ Cl2 = 2NaCl

2 moles Na = 2×23 g = 46g,1 mole Cl2 = 2×35.5g=71g

Now,71g Cl2 reacts with 46g Na,

Therefore, 67.2g Cl2 reacts with 46×67.2/71= 43.54g Name

The rest Na = (55–43.54)g=11.46g

That means Cl2 is a limiting reactant.

Again,2 moles NaCl=2(23+35.5)g=117g

Then,71g Cl2 produce 117g NaCl

Therefore,67.2g Cl2 produce 117×67.2/71 = 110.74g NaCl

hence the correct option is, b.) 111 g NaCl

The biological molecule made of only C, H and O with a molar ratio of 1:2:1 is Carbohydrates, and the most commonly known one is glucose, which is the monomer to build large carbohydrate compounds, the chemical formula for glucose is C6H12O6

Answer:

Electrons repel each other due to electrostatic force of attraction between both of them as a result prevent the electron from entering the nucleus preventing it from collapsing

Electrons repel each other because they have the same charge present in

them.

Law of magnetism states that:

Electrons are subatomic particles which are negatively charged which

depicts them possessing like poles.

This explains why electrons which are in contact with each other will repel as

a result of the repulsive force present in like poles.

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Answer: Seafloor spreading causes changes in coastlines

The concentration of the chloride ion. I got 0.9 M is  mathematically given as

[CL^-]=0.9mm

The reactants are listed on the left side of a chemical equation, while the products are listed on the right. Both sides of a balanced chemical equation have the same number of atoms of each element and the same overall charge.

Generally, the chemical equation for the question  is  mathematically given as

b) If the solution is \($\mathrm{Fe}_{3}(a \omega)$\)

\(\begin{aligned}\mathrm{FCl}_{3} & \rightarrow \mathrm{a}^{+3}+3 \mathrm{Cl}^{-} \\& 1 \mathrm{Fe}^{+3} \mathrm{~S} 3 \mathrm{al} \text { ions incota. } \\\Rightarrow\left[\mathrm{El}^{-}\right] &=\frac{3}{4} \mathrm{Cl}^{-}+4 \mathrm{Cl}^{-} \\therefore\left[\mathrm{Cl}^{-}\right] &=1.2 \mathrm{~mm} \times \frac{3}{4} \\&=0.9 \mathrm{~mm}\end{aligned}\)

In conclusion, the concentration of the chloride ion. I got 0.9 M is

[CL^-]=0.9mm

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Answer:

When the balanced chemical equation. The coefficient of oxygen is 3.

The mass of 4.35 moles of potassium chloride is 324.14 grams. Potassium chloride (KCl) is a chemical compound made up of potassium and chlorine.

Potassium chloride (KCl) is a chemical compound composed of potassium and chlorine. It is commonly used as a salt substitute for people on low-sodium diets, as well as a fertilizer, a source of potassium in food additives, and a component of some medical solutions. Potassium chloride can also be used in the production of various chemicals, including explosives and pharmaceuticals.

The molar mass of potassium chloride (KCl) is 74.55 g/mol (39.10 g/mol for K and 35.45 g/mol for Cl).

To calculate the mass of 4.35 moles of KCl, we can use the following formula:

mass = moles × molar mass

So, the mass of 4.35 moles of KCl is:

mass = 4.35 moles × 74.55 g/mol

mass = 324.14 g

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the checkboxes next to each row's HClO(aq)+(ch3)3 N(aq)->ClO-(aq)+(CH3)3 reactant to indicate that you agree with it (aq) In this HCl, the NH4+ is Brennstoff-Lowry Acid.

In the food, textile, metal, & rubber sectors, hydrogen chloride (HCl), also known as bleaching agent, is frequently used to neutralize alkaline substances. It quickly hydrolyzes if exposed to water and is neutralized if discharged into the soil.

A gas at ordinary temperature and pressure, hydrogen chloride (HCl) is a combination of the metals hydrogen and chlorine. Hydrochloric acid is a gaseous mixture of the gas and water.

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Writing and balancing complex half-reactions in acidic solutions involves a systematic approach. Here are the general steps to follow:

Identify the oxidation and reduction half-reactions: Determine which species is being oxidized (losing electrons) and which is being reduced (gaining electrons).

Balance the atoms: Begin by balancing all atoms except hydrogen and oxygen in each half-reaction.

Balance the charges: Add electrons (e-) to one side of each half-reaction to balance the charges.

Balance the oxygen atoms: Add water (H2O) to the side of the equation that lacks oxygen atoms.

Balance the hydrogen atoms: Add hydrogen ions (H+) to the side of the equation that lacks hydrogen atoms. Keep in mind that the solution is acidic.

Balance the charges: Adjust the number of electrons (e-) on each side of the equation to ensure that the charges are balanced.

Multiply the half-reactions: Multiply each half-reaction by an appropriate factor so that the number of electrons gained and lost are equal.

Combine the half-reactions: Add the two balanced half-reactions together and cancel out common terms on both sides of the equation.

By following these steps, you can effectively write and balance complex half-reactions in acidic solutions, ensuring that the overall reaction is balanced in terms of both atoms and charges.

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The oxygen atom is sp3 hybridized.

The hybridization of an atom in a molecule can be determined by analyzing the number of bonds and the geometric arrangement of the bonds and electron pairs around the atom. The following steps can be used to determine the hybridization of an atom:

Identify the central atom: The central atom is the atom in the molecule with the most number of bonds.

Count the number of bonds and electron pairs: Count the number of bonds and electron pairs around the central atom. A bond is a covalent bond, which is a chemical bond formed by the sharing of electrons between two atoms. An electron pair is a bonding pair or a non-bonding pair of electrons.

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Answer:

The answer is 5.

Answer:

H₂(g) + F₂(g) ⇒ 2 HF(g)   ΔH°rxn = -542 kJ

Explanation:

Let's consider the unbalanced equation that occcurs when H₂(g) reacts with F₂(g) to form HF(g).

H₂(g) + F₂(g) ⇒ HF(g)

In order to get the balanced equation, we will multiply HF(g) by 2.

H₂(g) + F₂(g) ⇒ 2 HF(g)

To convert a balanced equation into a thermochemical equation, we need to add the standard enthaply of the reaction, considering that 542 kJ of energy are evolved for each mole of H₂(g) and there is 1 mole of H₂(g) in the balanced equation. By convention, when energy is released, it takes a negative sign. The thermochemical equation is:

H₂(g) + F₂(g) ⇒ 2 HF(g)   ΔH°rxn = -542 kJ

Answer: In an endothermic reaction for whom the value of \(\Delta H\) is positive has potential energy of the products greater than the potential energy of the reactants.

Explanation:

A chemical reaction in which heat energy is absorbed is called an endothermic reaction. For an endothermic reaction the value of \(\Delta H\) is positive.

A chemical reaction in which heat energy is released is called an exothermic reaction. For an exothermic reaction the value of \(\Delta H\) is negative.

In an endothermic reaction, heat energy is absorbed by the reactant molecules due to which the energy of products tend to increase. As potential energy is the energy acquired by a substance due to its position.

Therefore, we can conclude that in an endothermic reaction for whom the value of \(\Delta H\) is positive has potential energy of the products greater than the potential energy of the reactants.

Answer:

C The potential energy of the products is greater than the potential

energy of the reactants.

Explanation:

Apx

Answer:

419 parts per million

Explanation:

The amount of carbon dioxide in Earth's atmosphere reached 419 parts per million in May, its highest level in more than four million years, the National Oceanic and Atmospheric Administration announced on Monday.

Hope it helps <3

Answer:

Explanation:

0.25 moles KCl = 19g KCl (molar mass KCl = 74.6g)

Answer:

(c). You will have an excess of gas and the reaction will occur.

Explanation:

We can use the ideal gas law to calculate the number of moles of gas in each case. The ideal gas law is:

PV = nRT

where:

At STP, the pressure is 1 atm (101.325 kPa) and the temperature is 273.15 K. So, the number of moles of gas at STP is:

\(n =\frac{ PV }{ RT} =\frac{ (101.325 kPa)(22.4 L) }{(8.31 L-kPa/mol-K)(273K)} = 1mol\)

At 100 kPa and 373 K, the number of moles of gas is:

\(n =\frac{ PV }{ RT} =\frac{ (100 kPa)(45 L) }{(8.31 L-kPa/mol-K)(373 K)} = 1.45mol\)

So, you have 1.45 moles of gas at 100 kPa and 373 K. The reaction requires 1 mole of gas at STP, so you have an excess of 0.45 moles of gas. The excess gas will not participate in the reaction, but it will not prevent the reaction from occurring.

Therefore, the correct answer is (c). You will have an excess of gas and the reaction will occur.

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Answer:

6-

Explanation:

the total oxide ion charge in the formula unit is 6-

Answer:

The answer is 6-

Explanation:

correct :)