Which is the jellylike substance within cells? plasma membrane DNA cytoplasm ribosomes

The acetylene torch valve is typically opened one-half to three-quarters of a turn before the oxyacetylene torch is lighted.

This allows the acetylene gas to flow at the correct pressure and ensures a proper mixture with the oxygen gas. Opening the valve too much or too little can lead to an unstable flame and potentially hazardous conditions. It is important to follow the manufacturer's instructions and safety guidelines when operating an acetylene torch to ensure proper use and avoid accidents. Always make sure to double-check the specific instructions for your torch model before use.

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Answer:

may be you mean water= hydrogen + oxygen, this reaction describes that water is made by the combination of hydrogen and oxygen.

The given statement, "Chemicals that facilitate movement of impulses at synapses are called sedatives" is False.

Chemicals that facilitate the movement of impulses at synapses are not called sedatives. In fact, sedatives are substances that have a calming or sleep-inducing effect by depressing the central nervous system (CNS) activity. They work by inhibiting neural activity, reducing anxiety, and promoting relaxation.

Chemicals that facilitate the movement of impulses at synapses are typically referred to as neurotransmitters or neuromodulators. Neurotransmitters are endogenous chemicals that transmit signals across synapses between neurons. They play a crucial role in the communication between nerve cells, facilitating the transmission of electrical impulses.

Examples of neurotransmitters include serotonin, dopamine, acetylcholine, norepinephrine, and gamma-aminobutyric acid (GABA). These chemicals are involved in various functions such as mood regulation, muscle movement, memory, and cognition.

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Answer:

Hunds rule is violated here.

Hunds rule : pairing of electrons takes place only if all the orbitals are filled with single electrons each.

The cell potential (Ecell) of the zinc-air battery at 25.0 degrees Celsius and a partial pressure of oxygen of 0.15 atm is 1.65 V.

To calculate the cell potential (Ecell) of the zinc-air battery at 25.0 degrees Celsius, we can use the Nernst equation, which relates the cell potential to the standard cell potential and the concentrations or pressures of the reactants:

\(E_{\text{cell}} = E^{\circ}_{\text{cell}} - \left(\frac{RT}{nF}\right) \ln(Q)\)

Where:

E°cell is the standard cell potential (given as 1.65 V)

R is the ideal gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin (25.0 + 273.15 = 298.15 K)

n is the number of electrons transferred in the balanced cell reaction (2 in this case)

F is Faraday's constant (96485 C/mol)

Q is the reaction quotient

In this case, since we are given the partial pressure of oxygen (O2) in the air diffusing through the cathode (0.15 atm), we can use the partial pressure as a substitute for concentration.

The reaction quotient (Q) can be calculated using the partial pressures of the reactants and products (ZnO):

\(Q = \frac{{(P(\text{ZnO}))^2}}{{P(\text{O}_2)}}\)

Plugging in the values into the Nernst equation, we have:

Ecell = 1.65 V -\(\frac{{8.314 \, \text{J/(mol}\cdot\text{K)}} \times 298.15 \, \text{K}}}{{2 \times 96485 \, \text{C/mol}}} \right) \ln \left( \frac{{(P(\text{ZnO}))^2}}{{P(\text{O}_2)}} \right)\)

Let's calculate the cell potential (Ecell) using the given values:

Ecell = 1.65 V -\({{8.314 \, \text{J/(mol}\cdot\text{K)}} \times 298.15 \, \text{K}}}{{2 \times 96485 \, \text{C/mol}}} \right) \ln \left( \frac{{(0.15 \, \text{atm})^2}}{{0.15 \, \text{atm}}} \right)\)

Simplifying the equation further:

\(E_{\text{cell}} = 1.65 \, \text{V} - (0.0257 \, \text{V}) \ln \left( \frac{{0.15^2}}{{0.15}} \right)\)

Calculating the natural logarithm:

\(E_{\text{cell}} = 1.65 \, \text{V} - (0.0257 \, \text{V}) \ln(1)\)

Since ln(1) is equal to 0:

Ecell = 1.65 V - (0.0257 V) * 0

Ecell = 1.65 V

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The electron configuration of Helium (He) is 1s², which means that it has two electrons in its outermost shell.

Helium is an inert gas and, like hydrogen, it also emits a line spectrum when it is energized.Helium has a more complex spectrum than hydrogen because it has more electrons.

As a result, it emits more lines than hydrogen. Helium has two electrons, which implies that it will have twice the number of lines than hydrogen.

The emission spectrum of helium will have more lines than that of hydrogen because helium has more electrons.

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Cyanide is the poisonous substance used to extract gold (d).

The extraction of metals and electroplating are two industrial procedures that commonly involve the highly poisonous chemical compound cyanide. Sodium cyanide, potassium cyanide, hydrogen cyanide gas, potassium ferrocyanide, and ferricyanide salts are some of the different forms it can take.

Cyanide is a poisonous compound that is frequently used to extract gold and has a negative impact on the environment. In order to remove gold particles from ore, the very poisonous chemical cyanide is employed in the gold mining process. Despite its effectiveness, cyanide leaking can have negative impacts on the ecosystem and neighboring plants and animals. Animal and fish deaths as well as contaminated water sources have been connected to cyanide releases from mining operations.

In addition, chronic exposure to low concentrations of cyanide can harm human health and result in headaches, vertigo, and nausea. Despite the fact that many nations have laws governing the use of cyanide in gold mining, its widespread usage and a lack of effective management and containment techniques continue to raise concerns.

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Either a Pyrex measuring cup or a graduated cylinder can be used to measure the metric volumes of any liquid.

A graduated cylinder is also called a measuring cylinder and it can be defined as a narrow, cylindrical piece of laboratory equipment with marked lines, which are used to measure the volume of a liquid.

Generally, a student or researcher can use a Pyrex measuring cup to measure the metric volumes of any liquid when a graduated cylinder isn't available.

In conclusion, you should record your estimates and the actual measurements for all the containers that were used in your project.

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Answer:

I think it's D one. Because all others are wrong

Answer: They can combine with other elements to form atoms.

Explanation:

The noble gas with an atomic mass less than gold, but more than silver, is platinum. Noble gases are found in small amount in earth atmosphere.

The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odorless, and colorless gases with relatively little chemical reactivity under normal conditions. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature.

These gases don't receive, lose, or share electrons, making them inert or unreactive. They are also referred to as noble gases due to their rarity in the atmosphere of the earth.

Thus, The noble gas with an atomic mass less than gold, but more than silver, is platinum.

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The balanced equation for the redox reaction between hydrogen peroxide (H₂O₂) and the ferrous ion (Fe²⁺) in an acidic solution is:

2Fe²⁺ + H₂O₂ + 2H⁺ → 2Fe³⁺ + 2H₂O

In this reaction, the hydrogen peroxide acts as an oxidizing agent, while the ferrous ion serves as the reducing agent. During the process, the ferrous ion (Fe²⁺) is oxidized to the ferric ion (Fe³⁺) and the hydrogen peroxide (H₂O₂) is reduced to water (H₂O).

The oxidation half-reaction is as follows:
Fe²⁺ → Fe³⁺ + e⁻

The reduction half-reaction is:
H₂O₂ + 2e⁻ + 2H⁺ → 2H₂O

By combining these half-reactions, we obtain the balanced redox equation mentioned above. This reaction can occur in various applications such as in the Fenton reaction, where it is used for environmental remediation or the treatment of wastewater.

Additionally, this reaction has importance in biological systems, as it helps to understand how cells protect themselves from the damaging effects of reactive oxygen species.

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The common name for nitric acid is actually just "nitric acid". It is also sometimes referred to as "aquafortis".

Nitric acid (HNO3) is a strong mineral acid commonly used in a variety of industrial processes, including the production of fertilizers, dyes, and explosives. It is a highly corrosive and toxic substance that can cause severe chemical burns if it comes into contact with skin or eyes.

Pure nitric acid is a colorless liquid that emits pungent, suffocating fumes when exposed to air. It is a strong oxidizing agent, meaning it readily donates oxygen atoms to other chemicals, and it can react violently with many organic and inorganic substances.

Nitric acid has a wide range of applications, including in the production of ammonium nitrate fertilizers, in the manufacture of nylon and other synthetic fibers, and in the production of nitroglycerin and other explosives. It is also used in the etching of metals, the purification of gold and silver, and in the production of pharmaceuticals and other chemicals.

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A very reactive metal is image D

A reactive metal is a metal that readily reacts with other substances in its environment, particularly with non-metals such as oxygen, chlorine, sulfur, and nitrogen. The reactivity of a metal depends on the ease with which it can lose electrons to form positive ions.  These metals are often used in chemical reactions because of their reactivity

The metal that has been shown in the image that is attached in option D is sodium which is known to loose electron easily hence it is a reactive metal.

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The chiral reagent is used to determine the optical activites of Sharpless reagent using one of two different chiral reagents along with a titanium catalyst and tetra-butyl hydroperoxide.

The reagent is mostly used in analytical chemistry to distinguish between the optical activities of the chiral carbons in analytical chemistry.

The tetra-butyl hydroperoxide is an optically active compound and chiral reagents use to know about the symmetry of carbons.

Therefore, the chiral reagent is used to determine the optical activities of the Sharpless reagent using one of two different chiral reagents along with a titanium catalyst and tetra-butyl hydroperoxide.

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Answer:

84.87

Explanation:

The molar mass of iron (III) oxide (Fe2O3) is:

Fe2O3 = (2 x atomic mass of Fe) + (3 x atomic mass of O)

= (2 x 55.845 g/mol) + (3 x 15.9994 g/mol)

= 111.69 g/mol + 47.9982 g/mol

= 159.688 g/mol

The number of moles of 3.2x10^23 formula units of Fe2O3 is:

Number of moles = (3.2x10^23) / Avogadro's number

= (3.2x10^23) / 6.022x10^23

= 0.532 moles

The mass of 3.2x10^23 formula units of Fe2O3 is:

Mass = number of moles x molar mass

= 0.532 moles x 159.688 g/mol

= 84.87 grams

Therefore, the mass of 3.2x10^23 formula units of Fe2O3 is approximately 84.87 grams.

I hope this clears things up for you!

The example that is nonpolar is d. a molecule with no partial charges.

When the charges of the molecule are symmetrical and there are no partial charges, it indicates that the molecule is nonpolar.

Polar molecules have partial positive and negative charges on either end of the molecule.

This occurs as a result of the polarity of the molecule, which is created by the difference in electronegativity between the two atoms forming the bond.

The charge distribution on the molecule is unbalanced due to this polarity, with the electron density more concentrated around the more electronegative atom.

The measurement of the polarity of a molecule is based on the difference in electronegativity between the two atoms forming the bond.

The polarity of a molecule can be determined using various methods, including the dipole moment method, which measures the magnitude of the dipole moment of the molecule.

The dipole moment measures the charge distribution in the molecule and is measured in Debye (D) units, where 1 D = 3.336 × 10-30 Cm.

In conclusion, a molecule with no partial charges is nonpolar.

The other options such as a negative ion, a neutral ion, and a positive ion are polar molecules as they have partial charges on either end of the molecule.

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Answer:

the colliding molecules do not have sufficient energy

The dilution of hydrogen peroxide that would not be considered a broad spectrum disinfectant is the solution which contain lower than 3% of hydrogen peroxide concentration.

Hydrogen peroxide is the simplest one among the peroxide group with a chemical formula H2O2. It is also an unstable chemical compound which in the presence of a base or a catalyst  and is stored in a weakly acidic solution with stabilizer.

Hydrogen peroxide is used as an oxidative biocide because of its application as preservative, disinfection and sterilization. due to the antimicrobial properties Hydrogen peroxide is stored in liquid and gaseous form.

So, a 3-5% of hydrogen peroxide concentration solution is considered in the broad spectrum of disinfect.

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Answer:

Lattice energy is an estimate of the bond strength.

Answer:

that the polar bear will come out again in 2 years

Answer:

water vapor

Explanation:

because gas molecules moves the fastest

Answer:

water vapor

Explanation:

Liquid water molecules have less freedom to move around. While molecules of water vapour have more freedom to move around as there is larger space between the molecules. Hence, the kinetic energy of water molecules is more as compared to the kinetic energy of liquid water

Explanation:

We are given: mass of NH3 = 18.5 g

We know: molar mass of NH3 = 17.031 g/mol

: molar mass of H2 = 2.016 g/mol

We first determine the number of moles of NH3:

We then determine the number of moles of H2 from the number of moles of NH3:

We then determine mass of H2 required:

Answer:

grams of H2 required = 3.28 g

Answer:

The pressure increases and the volume remains constant

Explanation:

Answer:

R = 8.314 pKa*L/mol*K

The value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

To determine the value for the ideal gas constant (R) when pressure (P) is in kilopascals (kPa), temperature (T) is in kelvins (K), volume (V) is in liters (L), and amount of gas (n) is in moles, we need to use the appropriate units for R based on these measurements.

The ideal gas constant, R, can be expressed in various units. The most common units for R are:

R = 0.0821 L·atm/(mol·K) (atmospheres, liters, moles, and kelvins)

However, since you provided the measurements in kilopascals, liters, moles, and kelvins, we need to use a different value for R that is consistent with these units:

R = 8.314 kPa·L/(mol·K)

Therefore, when pressure is in kilopascals, volume is in liters, amount of gas is in moles, and temperature is in kelvins, the value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

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Answer:

Krypton

Explanation:

They're both inert gases

The average atomic mass of copper can be calculated from the mass and percentage abundance of its isotopes. The average atomic mass of copper is 36.54 amu.

Isotopes are atoms of same element with different mass number. Isotopes slightly differ in physical and chemical properties from each other.

The average atomic mass of an element is calculated with the formula given below:

average atomic mass  = ∑ (% abundance /100) × isotopic mass.

mass of Cu-63 = 62.93 amu

% abundance = 69.15 %

mass of Cu-65 = 64.93 amu

% abundance = 30.85 %

Average atomic mass = (69.15 % /100 × 62.93 ) +  (30.85 % /100 × 64.93)

                                    = 63.54 amu.

Therefore, the average atomic mass of copper is 63.54 amu.

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Answer:

Directly by the sun