Lead has a density of 11.4 g/cm^3. What is the density in kilograms per cubic meter?

Explanation:

Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium iskept immersed in kerosene becauseSodium doesn't react with kerosene

The pH of a buffer solution that is formed by mixing 85 ml of 0.13 M lactic acid with 95 ml of 0.14 M sodium lactate is 4.91.

A buffer solution is an aqueous solution that can resist changes in pH even when small quantities of acidic or basic substances are added to it. Buffers have the ability to maintain their pH in the presence of an acid or base. This is due to the presence of conjugate acid-base pairs in the buffer solution.

Calculation:Given:Initial concentration of lactic acid = 0.13 MInitial concentration of sodium lactate = 0.14 MVolume of lactic acid = 85 mlVolume of sodium lactate = 95 mlpKa of lactic acid = 3.86The Henderson-Hasselbalch equation for pH is:pH = pKa + log [A-]/[HA]where pKa is the acid dissociation constant, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.In this problem, lactic acid (HA) is the acid and sodium lactate (A-) is the conjugate base.

We must first calculate the concentrations of the acid and its conjugate base.[HA] = 0.13 M x 85/180 ml = 0.0611 M[A-] = 0.14 M x 95/180 ml = 0.0737 M, Substitute the values of [A-], [HA] and pKa in the above equation, we get:pH = 3.86 + log (0.0737/0.0611)pH = 4.91Hence, the pH of the buffer solution is 4.91.

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Answer:

xcvbn

Explanation:

nkj

Answer:

what he said

Explanation:

The balanced chemical equation for the reaction is:

2 Sn(ClO4)4 (s) → SnCl4 (s) + 8 O2 (g)

In order to balance the chemical equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

Starting with the left side of the equation, we have one tin atom (Sn), four perchlorate ions (ClO4-), and a total of 4 × 4 = 16 oxygen atoms (O). On the right side of the equation, we have one tin atom (Sn), four chloride ions (Cl-), and a total of 8 oxygen atoms (O) in the form of O2 gas.

To balance the tin (Sn) atoms, we need to have the same number on both sides of the equation. Therefore, we place a coefficient of 2 in front of Sn(ClO4)4, resulting in 2 Sn(ClO4)4.

Now, let's balance the chlorine (Cl) atoms. On the left side, we have 4 × 4 = 16 chlorine atoms from the perchlorate ions.

To balance this, we need to have the same number of chloride ions (Cl-) on the right side. Therefore, we put a coefficient of 4 in front of SnCl4, giving us 4 SnCl4.

Finally, let's balance the oxygen (O) atoms. On the left side, we have 4 × 4 = 16 oxygen atoms from the perchlorate ions. On the right side, we have 8 oxygen atoms in the form of O2 gas. These numbers are already balanced.

After applying the appropriate coefficients, the equation becomes:

2 Sn(ClO4)4 (s) → 4 SnCl4 (s) + 8 O2 (g)

In conclusion, the balanced chemical equation for the reaction Sn(ClO4)4 (s) → SnCl4 (s) + O2 (g) is 2 Sn(ClO4)4 (s) → 4 SnCl4 (s) + 8 O2 (g). This equation ensures that the number of atoms of each element is the same on both sides.

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Explanation:

The claim that hydrogen chloride (HCl) would be much stronger than nitric acid (HNO3) due to opposing dipole forces is incorrect.

Both HCl and HNO3 are strong acids, meaning that they dissociate completely in water to produce H+ ions. The strength of an acid is determined by the degree to which it dissociates in water. In other words, the stronger the acid, the more H+ ions it produces in water.

The dissociation of HCl and HNO3 in water can be represented as follows:

HCl + H2O → H+ + Cl-

HNO3 + H2O → H+ + NO3-

As we can see, both HCl and HNO3 produce H+ ions in water. Therefore, the strength of an acid cannot be solely determined by its dipole forces.

In addition, it's important to note that HCl is a much more volatile and corrosive acid than HNO3. It can cause severe respiratory and skin irritation when it is inhaled or comes into contact with skin. Therefore, switching HNO3 for HCl could be dangerous and should not be done without proper precautions and expert knowledge

Answer: It is true for the process used to achieve the required dilution that volume of the solvent used is less than 2 liters.

Explanation:

Given: \(M_{1}\) = 10 M,       \(V_{1}\) = ?

\(M_{2}\) = 1 M,       \(V_{2}\) = 2 L

The volume of stock solution is calculated as follows.

\(M_{1}V_{1} = M_{2}V_{2}\\10 M \times V_{1} = 1 M \times 2\\V_{1} = 0.2 L\)

A solution which contains small amount of solute is called a dilute solution. Whereas a solution which contains more amount of solute is called a concentrated solution.

The stock solution is used for dilution and hence, it acts as a solvent. Its calculated volume is 0.2 L.

This means that volume of the solvent used is less than 2 liters.

Thus, we can conclude that it is true for the process used to achieve the required dilution that volume of the solvent used is less than 2 liters.

Answer: The volume of the solvent used is less than 2 liters.

Explanation:

Answer: The chemical formula is Ch(HCO3)2 and Cn(HO3)2

Explanation:

There is 1 atom of Ba, 2 atoms of hydrogen, 2 atoms of carbon, and 6 atoms of oxygen.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

The chemical formula Ba(HCO3)2 tells us about the number of atoms of each element present​ as follows:

1 atom of Ba

2 atoms of hydrogen

2 atoms of carbon

6 atoms of oxygen.

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ANSWER

EXPLANATION

Firstly, we need to define the word titration.

Titration is defined as a technique that is used to determine the known concentration of an unknown solution.

This normally occurs between an acid and a base

During titration, an indicator changes color when equilibrium has been attained between the two solutions. The solutions are normally acid and base. At equilibrium, the number of moles of acid is equal to the number of base.

Therefore, the correct answer is option C

Answer:

C

Explanation:

A polymer called polystyrene (PS) is created from the liquid hydrocarbon styrene, which is produced commercially from petroleum.

The monomers of the aromatic hydrocarbon styrene are converted into a synthetic polymer known as polystyrene. Polystyrene can be either foamed or solid. For normal use, polystyrene is clear, hard, and brittle. It is a fairly priced resin when measured by weight. It has a weak barrier to oxygen and water vapor and a relatively low melting point. Polystyrene is commonly used to preserve consumer items in both solid and foam forms. In order to protect food from damage or spoiling, polystyrene is frequently used to produce CD and DVD covers, foam shipping peanuts, food packaging, meat/poultry trays, and egg cartons.

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The EPA stream quality indicator for dissolved oxygen in stream water is:c. 5 mg per liter

Dissolved oxygen (DO) is an important indicator of the health of a water body. The EPA (Environmental Protection Agency) has set guidelines for the minimum dissolved oxygen levels to support a healthy aquatic ecosystem. For streams, the recommended minimum level of dissolved oxygen is 5 mg per liter. This level ensures that the water can support a diverse range of aquatic life, including fish, invertebrates, and other organisms.
To maintain good water quality, it's essential to regularly monitor dissolved oxygen levels using various sampling methods and equipment. If dissolved oxygen levels drop below the recommended threshold, it can indicate problems such as pollution or excessive nutrient loading, which can lead to eutrophication and negatively impact the ecosystem.

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If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.

Kelli and Jarvis exert a force of 524 N on a 158- kg (m) piano.

The friction force, which opposes this force, is 418 N.

The net force (F) is the difference between both forces.

F = 524 N - 418 N = 106 N

We can calculate the acceleration (a) of the piano using Newton's second law of motion.

Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.

a = F/m = 106 N/158kg = 0.671 m/s²

The piano start from rest (u = 0 m/s) and moves with an acceleration of 0.671 m/s² for 1.44 s.

We can calculate its final velocity (v) using the following kinematic equation.

v = u + a × t

v = 0 m/s + 0.671 m/s² × 1.44 s = 0.966 m/s

If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.

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Answer:

              166 g of Zinc

Explanation:

First calculate moles of Gold.

Moles = Mass / M.Mass

Moles = 500 g / 196.96 g/mol

Moles = 2.54 mol

Secondly, calculate mass of Zinc using moles of Gold.

Mass = Moles × M.Mass

Mass = 2.54 mol × 65.36 g/mol

Mass = 166 g of Zinc

If you add 5 ml of 0.5 M NaOH solution to 20 ml each of buffer B (with a pH of 4.03) and buffer C, the buffer whose pH will change the least is buffer B.

What is a buffer?

A buffer is a solution that resists changes in pH when acid or alkali is added. A buffer solution is a solution that contains a weak acid and its corresponding weak base or a weak base and its corresponding weak acid.

The Henderson-Hasselbalch equation can be used to calculate the pH of a buffer solution before and after adding a strong base or acid.

The equation is pH = pKa + log ([A-]/[HA])

where:pKa is the dissociation constant for the acid[A-] is the conjugate base of the acid when a command (such as NaOH) is added to a buffer solution, the base reacts with the weak acid to form the conjugate base of the acid and water. The addition of the conjugate base of the acid causes the pH of the solution to rising.

When an acid (such as HCl) is added to a buffer solution, the acid reacts with the weak base to form the conjugate acid of the base and water. The addition of the conjugate acid of the base causes the pH of the solution to decrease. Based on the above equation, pH change will be minimum in Buffer B. Therefore, the buffer whose pH will change the least is buffer B.

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Answer:

Yes, they are useful.

Explanation:

They allow us to make use of strengths and benefits of a particular element while not being hampered by it's faults.

Answer:

Anemometer. An anemometer is a type of weather instrument that measures wind speed.

Mothballs are made of naphtalene. The chemical structure of naphthalene is formed by two benzene rings, which gives this substance the classification of an aromatic compound.

The active principle of naphthalene is explained by a very interesting physical characteristic: sublimation, which is defined as the direct transition from a solid to a gaseous state. Once sublimated, naphthalene appears as a toxic vapor for undesirable microorganisms.

So, when a bag of mothballs is opened, they will sublime. So the molecules will not be able to come back to the bag, because they're in the gaseous state, which is too difficult for us to "pick up" the molecules of mothballs again and place them in their bag again.

It is like picking up water vapor, it is impossible.

Answer: Alternative "D"

In chemistry, the process of preparing solutions involves dissolving a solute in a solvent. The amount of solute present in the solution determines its concentration, which can be expressed as the amount of solute per unit volume or mass of the solution. This is similar to the concept of concentrated and dilute chocolate milk, where the concentration of chocolate syrup in the milk determines its taste.

Chemists use various methods to prepare solutions of different concentrations, depending on the desired application. For example, a concentrated solution may be required for a specific reaction, while a dilute solution may be suitable for other purposes. The process of preparing a solution involves accurately measuring the amount of solute and solvent, and mixing them together until the solute is completely dissolved.

The concentration of a solution is an important factor in chemistry, as it affects the properties and behavior of the solution. Chemists use various techniques to measure the concentration of a solution, such as titration or spectrophotometry. Understanding the relationship between solute, solvent, and concentration is essential in chemistry, and is relevant in many areas of science and industry.

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Answer:

Explanation:

The mass of the object can be found by using the formula

\(m = \frac{f}{a} \\ \)

where

a is the acceleration

f is the force

From the question we have

\(m = \frac{20}{10} \\ \)

We have the final answer as

Hope this helps you

The answer would be:

In2(SO4)3 (Also known as Indium Solfate).

Answer

0.009 mol/L

Explanation

Given:

Mass of KCl = 0.66 g

Volume of water = 700 mL = 0.7 L

From the periodic table: 1 mol K = 39.10 g; 1 mol Cl = 35.453 g

What to find:

The molarity of the solution

Step-by-step solution:

The formula to calculate molarity is:

The first step is to calculate the molar mass of KCl

KCl = Mass of 1 mol K + Mass of 1 mol Cl

KCl = 39.10 g + 35.453 g

KCl = 74.553 g

So the molar mass of KCl = 74.553 g/mol

The next step is to determine the number of moles of KCl in 0.66g of KCl:

Put the values of mole and volume into the molarity formula above to determine the molarity of the solution:

The molarity is 0.009 mol/L

Answer:

3.82 g.

Explanation:

To calculate the mass of sulfuric acid produced from 1.25 g of sulfur, we'll have to balance the chemical equations and use stoichiometry.

Starting with the first reaction:

2S(s) + 3O2(g) → 2SO3(g)

Since 1.25 g of sulfur is reacted, the number of moles of sulfur can be calculated as:

moles = mass / molar mass = 1.25 g / 32 g/mol = 0.03906 mol

Next, using the mole ratio from the balanced chemical equation, we can find the number of moles of sulfur trioxide produced:

2 moles of sulfur produce 2 moles of sulfur trioxide, so:

moles of SO3 = moles of S x (moles of SO3 / moles of S) = 0.03906 mol x (2 mol / 2 mol) = 0.03906 mol

Finally, we move on to the second reaction, the dissolution of sulfur trioxide in water:

SO3(g) + H2O(l) → H2SO4(l)

Using the mole ratio from this balanced equation, we can find the number of moles of sulfuric acid produced:

1 mole of sulfur trioxide reacts with 1 mole of water to produce 1 mole of sulfuric acid, so:

moles of H2SO4 = moles of SO3 x (moles of H2SO4 / moles of SO3) = 0.03906 mol x (1 mol / 1 mol) = 0.03906 mol

The mass of sulfuric acid produced can be calculated using the moles and the molar mass of sulfuric acid:

mass = moles x molar mass = 0.03906 mol x 98 g/mol = 3.82 g

Therefore, if 1.25 g of sulfur is reacted, the mass of sulfuric acid produced is approximately 3.82 g.

\( \mathrm\pink{Almost \: all \: fossils \: are \: in \: sedimentary \: rocks.} \)

The molar mass of the gas that has a mass of 3.82 g and occupies a volume of 0.854 L is 106.66g/mol.

The molar mass of a substance can be calculated by dividing the mass of the substance by its number of moles.

However, the number of moles of the gas in this question needs to be calculated first using the ideal gas law equation:

PV = nRT

Where;

1.04 × 0.854 = n × 0.0821 × 302

0.888 = 24.79n

n = 0.888/24.79

n = 0.036mol

Molar mass of gas = 3.82g/0.036mol

Molar mass = 106.66g/mol

Therefore, the molar mass of the gas that has a mass of 3.82 g and occupies a volume of 0.854 L is 106.66g/mol.

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Answer:

m/s

Explanation:

One 'm' and one 's' in the numerator and the denominator 'cancel out' and you are left with  m / s

Answer:

Option B is the correct answer

Cobalt (III) carbonate

Explanation:

The chemical name of CO₂(CO₃)₃ is Cobalt (III) carbonate

Answer:

True,When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction.

Answer:

as a lipid bilayer

Explanation:

just took the test

Answer:

A. as a lipid bilayer

Answer:

Fluorine belongs to the group 7 A so it must have 7 electrons in the oribits so the answer would be A as u count the electrons in the orbits, There are exactly 7 electron

Explanation: