calculate the ph for each of the cases in the titration of 25.0 ml of 0.180 m pyridine, c5h5n(aq) with 0.180 m of the strong acid hbr(aq) . the Kb of pyridine is 1.7×10−9.

Answer:

A

Explanation:

The specific heat of olive oil (2 J/g·°C) is less than that of water (4.18 J/g·°C). This indicates that olive oil requires less heat energy to raise its temperature compared to an equal mass of water.

To describe the specific heat of olive oil compared to water, we can use the given information that it takes approximately 420 J of heat to raise the temperature of 7 g of olive oil by 30°C.

The specific heat capacity of a substance is defined as the amount of heat required to raise the temperature of 1 gram of the substance by 1 degree Celsius (or Kelvin).

In this case, we can calculate the specific heat of olive oil by dividing the amount of heat (420 J) by the mass (7 g) and the temperature change (30°C):

Specific heat of olive oil = (Amount of heat)/(Mass * Temperature change)

                          = 420 J / (7 g * 30°C)

                          ≈ 2 J/g·°C

Comparing this specific heat value to the specific heat of water (which is approximately 4.18 J/g·°C), we can conclude that the specific heat of olive oil (2 J/g·°C) is less than the specific heat of water. This means that olive oil requires less heat energy to raise its temperature compared to an equal mass of water.

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How can you describe the specific heat of olive oil compared to water if it takes approximately 420 J of heat to raise the temperature of 7 g of olive oil by 30°C?

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

Solar energy. Biofuel, Nuclear power, Hydro power, Geothermal energy, Fossil, Gasoline, sun

Answer:

It emits hydrogen sulfide...smells like rotten eggs..

ty:)pls let me know whether this is ryt:D

Answer:

Hey!

Your answer is that it creates hydrogen sulfide gas / liquid...

Which really smells...

Explanation:

HOPE THIS HELPS!

The standard potential for the given galvanic cell is +1.06 V.

To calculate the standard potential for the given galvanic cell, we need to determine the individual reduction potentials of the half-reactions and then subtract the potential of the anode (where oxidation occurs) from the potential of the cathode (where reduction occurs).

Given reduction half-reaction potentials:

Ag+(aq) + e^− → Ag(s): E∘ = +0.80 V

Ni2+(aq) + 2e^− → Ni(s): E∘ = -0.26 V

Since we have the reduction potentials for both half-reactions, we can directly calculate the standard potential for the cell:

E∘(cell) = E∘(cathode) - E∘(anode)

= E∘(Ag+(aq) + e^− → Ag(s)) - E∘(Ni2+(aq) + 2e^− → Ni(s))

E∘(cell) = +0.80 V - (-0.26 V)

= +1.06 V

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Answer:

it would have some bacteria considering it would probs take up to 4-6 days for it to grow

Explanation:

Answer:

particle E and R

Explanation:

isotopes = atoms of same element with same proton number but different number of neutron

nucleon number = proton number + number of neutrons

particle E

- nucleon number = 16

- proton number = electron = 8

- number of neutrons = 16-8 = 8 ✅

particle Q

- nucleon number = 18

- proton number = electron = 9

- number of neutrons = 18-9 = 9

particles R^2-

- nucleon number = 18

- proton number = 10-2 = 8

- number of neutrons = 18-10 = 8 ✅

particle T^+

- nucleon number = 22

- proton number = 10+1 = 11

- number of neutrons = 22-11 = 10

The empirical formula for the compound is \(PCl_{3}\)

The empirical formula of a compound is the formula in which the atoms of all the elements are present in their simplest whole-number ratio. It's possible that a compound's empirical formula and molecular formula are different.

Given Information:

P = 10.15 mg

Cl = 34.85 mg

Convert mg to moles

                                 31 mg of P ----------------- 1 mmol

                                 10.15 mg  ------------------   x

                                 x = 0.327 mmol of P

                                  35.5 mg of Cl ------------  1 mmol

                                   34.85 mg -----------------  x

                                 x = 0.982 mmol of Cl

Divide by the lowest number of mmoles:

For P = \(\frac{0.327}{0.327}\) = 1

For Cl = \(\frac{0.982}{0.327}\) = 3

So the empirical formula for the compound will be \(PCl_{3}\)

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Explanation:

Y has 13 protons and we know that Aluminium (Al) too has 13 protons.

So , element Y = Aluminium

• In an element , no. of protons = no. of electrons. So , Y has 13 electrons.

• Mass no. of Y (Aluminium) = 27.

• Also we know that ,

Mass number = no. of protons + no. of neutrons

So,

No. of neutrons = 27 - 13 = 14

• Valence electrons are the electrons which are present in the outermost shell of an element.

Electronic Configuration of Y = 2,8,3

So, Y has 3 valence electrons.

• We know that Y is Aluminium & Aluminium is a metal. So , Y is a metal.

• Valency of Y = +3

Small airborne particles of solid substances such as grain, flour, sugar, coal, metal, or sawdust are commonly known as dust.

Dust is an accumulation of small particles that are released into the air through various activities such as cutting, grinding, drilling, or blasting. These activities generate a lot of fine dust particles, which can cause respiratory problems when inhaled. The type of dust generated depends on the source material and the nature of the activity. For example, sawdust is generated during woodworking, flour dust is common in bakeries, and coal dust is generated in coal mines.

Dust particles are classified based on their size, with the smallest particles being the most dangerous. Fine dust particles, also known as PM2.5, are small enough to penetrate deep into the lungs and can cause a range of health problems such as asthma, bronchitis, and lung cancer. Long-term exposure to dust can also lead to chronic respiratory diseases. Dust control measures such as ventilation, dust suppression, and personal protective equipment can help reduce the risk of dust exposure in workplaces.

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The sulfur hexafluoride molecule consists of one sulfur atom and six fluorine atoms. The atomic masses of sulfur and fluorine are 32.0 u and 19.0 u, respectively. One mole of this very heavy gas has a mass of 146.0 grams.

To find the mass of one mole of sulfur hexafluoride (SF6) molecule, we need to calculate the molecular mass of the compound using the atomic masses of sulfur and fluorine.

The sulfur hexafluoride molecule consists of one sulfur atom and six fluorine atoms. The atomic masses of sulfur and fluorine are 32.0 u and 19.0 u, respectively.

Step 1: Calculate the mass of the sulfur atom.
Mass of sulfur = 1 x atomic mass of sulfur = 1 x 32.0 u = 32.0 u

Step 2: Calculate the mass of the six fluorine atoms.
Mass of fluorine = 6 x atomic mass of fluorine = 6 x 19.0 u = 114.0 u

Step 3: Calculate the molecular mass of sulfur hexafluoride.
Molecular mass of SF6 = mass of sulfur + mass of fluorine = 32.0 u + 114.0 u = 146.0 u

Step 4: Convert the molecular mass to molar mass.
One mole of sulfur hexafluoride has a mass of 146.0 grams.

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Answer: A cation

Explanation:

Note: in the International System of Units, The kilogram or kilogramme (symbol: kg) is the base unit of mass.

2nd Note:

1 gram = 0.001 Kilograms

72 kilograms converted to grams is 72,000 grams.

333 grams is 0.333 kilograms.

0.23976 is the pizza percentage.

Rounded: 0.24

Therefore, your answer is 0.24

Atoms combine in the initial manner by transferring electrons among themselves because their particular nuclei are attracted to the electrons from other atoms. When the compounds being produced are at a lower energy than the original atoms, atoms combine to form compounds. The chemicals inside the reactants interact throughout hydrolysis reaction to create new substances.

Atoms create new substances by swapping electrons with each other rather than by gaining neutrons from each other. When two or more atoms share at least one pair of electrons, this is known as a covalent connection. Ionic bonds form when positive and negative bonds are attracted to each other and share a proton as a result .

element with one another in order to build a comprehensive electron shell, which increases stability. Subatomic particles may fill up the sell of electrons and then become permanent by sharing their topmost (valence) electrons.

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The term volume represents how much space an object or the substance takes up. Here the space occupied by lead in 900.0 g can of paint is  0.079 L.

The volume is the measure of the capacity that an object holds. For example if a beaker can hold 100 mL of water, then its volume is said to be 100 mL. The SI unit of volume is m³.

The equation used to calculate the volume is:

Density = Mass / Volume

Volume = Mass / Density

Density of lead = 11.34 g/cm³

Volume = 900.0 g / 11.34 g/cm³

= 79.36 cm³

1  cm³ = 0.001 L

79.36 cm³ = 0.079 L

Thus the lead occupies 0.079 L space.

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Answer:

2atm symbol can be used to indicate the pressure at which a chemical reaction is carried out

Answer:

have one delocalised electron

Explanation:

The elements which are  present of left side of periodic table have similar chemical properties.

Periodic table is a tabular arrangement of elements wherein elements are arranged according to their atomic numbers. It consists of seven horizontal rows called periods  and eighteen vertical columns called groups .

Elements in the same group have similar chemical properties as they have same number of valence electrons. While, electrons in the same period have different valence electrons as electrons are added to same shell and hence have  a little variation in chemical properties.

It is called periodic as properties repeat after an interval of certain electronic configuration. Elements are divided in four blocks depending on their properties.

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A triple bond may consist of one sigma bond and two pi bonds.

Sigma bonds are the most powerful kind of covalent chemical bond. they're fashioned by way of head-on overlapping among atomic orbitals. Sigma bonding is most surely described for diatomic molecules the usage of the language and equipment of symmetry businesses

Sigma bond is a covalent bond formed by overlap of atomic orbitals and hybrid orbitals along the bond axis. The sigma bond in the a hydrogen molecule is formed by overlap of a pair of 1s orbitals, one from each hydrogen atom.

The pi bond is the same as that of the p orbital when seen down the bond axis.

A pi bond is a weaker chemical covalent bond than a sigma bond.

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Answer:

A. 1.73 m = 172 cm

B. 7,651.27 m = 7.65127 Km

When using a Van de Graaff generator charges repel because all the charges are negatively charged.

The Van de Graaff become negatively charged, because the rubber belt is an insulator and a poor conductor of electricity, the positive charge does not spread evenly across the belt.

Instead, as a result of electric induction, the inside of the belt remains positively charged, while the outside of the belt becomes negatively charged.

Thus, When using a Van de Graaff generator charges repel because all the charges are negatively charged.

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Answer: C

Explanation:

Correct option is c. 0

Let's discuss it further below.

In the Lewis structure for formaldehyde (H2CO), where C is the central atom, the formal charge on C is:

Step 1: Determine the number of valence electrons for C. Carbon has 4 valence electrons.
Step 2: Calculate the number of electrons assigned to C in the Lewis structure. In formaldehyde, C is bonded to 2 H atoms (each with 1 bond) and 1 O atom (with a double bond). This gives C a total of 4 bonds, so it has 4 assigned electrons.
Step 3: Calculate the formal charge on C using the formula: Formal Charge = (Valence Electrons) - (Assigned Electrons). Thus, Formal Charge on C = (4) - (4) = 0.

So, the formal charge on C in the Lewis structure for formaldehyde is 0 (option c).

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Answer:

a

Explanation:

I'm not completely sure tho veary sorry if it's wrong

Answer:

the answer is C

Explanation:

as the yeast feeds on sugar and yields the ATP per glucose molecule and Carbon dioxide

Answer: Atoms contain tiny, negatively charged electrons

Explanation: Thomson's experiments with cathode ray tubes helped him to discover the electron (which Dalton did not know about). Dalton thought that atoms were indivisible particles, and Thomson's discovery of the electron proved the existence of subatomic particles.

Answer:

There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells.

Answer:

the 2nd choice, nervous and muscular

The fraction of dissociated -chlorobutanoic acid in the student's aqueous solution can be calculated. The answer will be expressed as a percentage.

To calculate the fraction of dissociated -chlorobutanoic acid, we need to know the acid dissociation constant (Ka) for -chlorobutanoic acid. The Ka value indicates the degree to which the acid dissociates in water. Using the Ka value and the initial concentration of the acid, we can determine the concentration of dissociated acid.

The fraction of dissociated acid is then calculated by dividing the concentration of dissociated acid by the initial concentration and multiplying by 100 to convert it to a percentage.

The specific value of the Ka for -chlorobutanoic acid and the initial concentration of the solution are not provided in the question. To obtain an accurate answer, these values are necessary for the calculation.

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Answer: 3.844 times 10 to the 5th power

Explanation:

Answer:

3.844 * 10^5 kilometres

Explanation:

hope you find it helpful.