please show all steps and dont copy-paste from another chegg
solution
Calculate the vapour pressure (in mm Hg) of water at 20 °C using the data below: The heat of vaporisation: 40.66 kJ/mol Boiling point: 100 °C (at 1.0 atm) According to the result, what can be said a

To make 1 liter of a 10% NaCl solution from a solid stock, you will require the following materials and containers.MaterialsSolid NaClDistilled water1-Liter volumetric flask250-mL volumetric flask 2-beakersProcedureTo prepare 1 liter of a 10% NaCl solution, the following procedure should be followed:Measure out 100g of NaCl using a balance.

Measure the weight of an empty 250-mL volumetric flask.Add the NaCl to a 250-mL beaker and add a small amount of distilled water to it to dissolve the NaCl.Carefully pour the dissolved NaCl solution into the 250-mL volumetric flask. Add distilled water to the mark on the flask to make up the volume. Stopper the flask and invert it several times to mix the solution.Measure the weight of the 1-Liter volumetric flask.Add the 250-mL volumetric flask solution to a 1-Liter volumetric flask.Add distilled water to the mark on the flask to make up the volume.

Stopper the flask and invert it several times to mix the solution.The final volume of the solution will be 1 liter of a 10% NaCl solution.PrecautionsEnsure the NaCl has completely dissolved before adding more water to avoid making a less concentrated solution.Measure the weight of the volumetric flask before and after adding the solution to calculate the volume of solution that was added.Use distilled water to prepare the solution.

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Answer:

This question doesnt make much sense but ill try to answer it.

A brushed DC electric motor is an internally commutated electric motor designed to be run from a direct current power source. Brushed motors were the first commercially important application of electricity. If the shaft of a DC motor is turned by an external force, the motor will act as a generator. DC Motor rotation does have to do with the voltage polarity and the direction of the current flow.

In terms of increasing carbon-carbon bond strength and decreasing bond length, the order is: H3CCH3 (Ethane) < H2CCH2 (Ethylene) < HCCH (Acetylene).

1. H3CCH3 (Ethane): In this molecule, there is a single bond (C-C) between the two carbon atoms. Single bonds have the lowest bond strength and the longest bond length among the three types of carbon-carbon bonds.

2. H2CCH2 (Ethylene): In this molecule, there is a double bond (C=C) between the two carbon atoms. Double bonds have a higher bond strength and a shorter bond length than single bonds.

3. HCCH (Acetylene): In this molecule, there is a triple bond (C≡C) between the two carbon atoms. Triple bonds have the highest bond strength and the shortest bond length among the three types of carbon-carbon bonds.

So, in terms of increasing carbon-carbon bond strength and decreasing bond length, the order is: H3CCH3 (Ethane) < H2CCH2 (Ethylene) < HCCH (Acetylene).

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Answer:

Chemical bonding - a mutual adhesion of atoms in an molecule and the crystal lattice.

Explanation:

Answer:

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.

Answer:

B) the rabies viru

Explanation:

Answer:

An acid and a base.

Explanation:

An acid and a base, combine to form the products salt and water

That is,

Acid + Base ----> Salt + water.

Answer:

Acid and base

The volume occupied by a 21.8 g sample of osmium is approximately \(0.964 cm^3\).

The volume (in \(cm^3\)) occupied by a 21.8 g sample of osmium can be calculated using its density of \(22.6 g/cm^3\).

To find the volume, we can use the formula:

Volume = Mass / Density.

Plugging in the values, we have:

Volume = 21.8 g / \(22.6 g/cm^3\)

Now, dividing 21.8 g by \(22.6 g/cm^3\) gives us the volume in cm^3.

Calculating this, we get:

Volume = \(0.964 cm^3\)

So, a 21.8 g sample of osmium would occupy a volume of approximately \(0.964 cm^3\)

In conclusion, the volume occupied by a 21.8 g sample of osmium is approximately \(0.964 cm^3\)

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Sodium-potassium pumps actively transport sodium ions out of the cell and potassium ions into the cell, maintaining appropriate ion concentrations after nerve impulses.

Sodium-potassium pumps play a crucial role in maintaining appropriate ion concentrations, especially after nerve impulses that involve ion diffusion. These pumps are specialized proteins found in the cell membrane of neurons and other cells. They work by actively transporting sodium ions (Na+) out of the cell and potassium ions (K+) into the cell, against their concentration gradients. This process requires energy in the form of adenosine triphosphate (ATP).

When a nerve impulse occurs, there is a rapid exchange of sodium and potassium ions across the cell membrane, leading to temporary imbalances in ion concentrations. Sodium ions rush into the cell, while potassium ions move out. This movement generates an electrical signal that allows the nerve impulse to travel along the neuron. However, these rapid changes in ion concentrations need to be restored to their original levels quickly for the neuron to function properly.

This is where sodium-potassium pumps come into play. They actively transport sodium ions out of the cell, helping to restore the initial balance. Additionally, these pumps bring potassium ions back into the cell, replenishing the potassium that was lost during the nerve impulse. By constantly maintaining the appropriate ion concentrations, sodium-potassium pumps ensure the proper functioning of neurons and support various physiological processes, including nerve signaling and muscle contraction.

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Answer:

Ionic bonding occurs when atoms either gain or lose one or more valence electrons, resulting in the atom having either a negative or positive charge.

Through ionic bonding, an atom of each element will combine with the other to form a molecule, which is more stable since it now has a zero charge.

Explanation:

Answer:

Ionic bonding occurs when atoms either gain or lose one or more valence electrons, resulting in the atom having either a negative or positive charge.

Explanation:

Hope this helps!!:)

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer:

uhm

Explanation:

Answer:

an intrinsic characteristic of a particular acid, not related to concentration

Explanation:

this is easy

An intrinsic characteristic of a particular acid is not related to concentration. Hence, option B is correct.

An acid is any substance that tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, and reacts with bases to form salts.

Whereas pH measures the concentration of solvated protons and does not tell us about the intrinsic acidity of chemical species present in solution, electrode potentials tell us about the intrinsic oxidizing power of the species present but provide no information on their concentration.

By the addition of a sufficient amount of redox indicator to a solution, its redox potential can be measured using redox electrodes.

Hence, an intrinsic characteristic of a particular acid is not related to concentration.

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The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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When you walk over a sidewalk with barefoot, your feet make contact with the surface, which conducts heat to your feet.Convection drives the majority of heat energy in the atmosphere.

Conduction transfers heat from heated sand to a bottoms of your feet.Heat is transferred by conduction when two items come into contact.Heat energy passes from the warmer to the colder of two materials when their temperatures differ.

conduction Three methods exist for transferring heat: conduction, convection, and radiation.Energy is transferred directly from one atom to another through conduction.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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The notation for the enthalpy of the solution is ∆Hsol. The correct answer is option ∆Hsol.

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The statement "100% iodine and 95% alcohol are rapidly effective disinfectants" is False.

What are disinfectants?

Disinfectants are chemical agents that can destroy or remove harmful microorganisms, viruses, and bacteria from various surfaces, areas, and substances. The effectiveness of a disinfectant can be determined by its ability to kill bacteria, viruses, and other microorganisms effectively.

What are the effective disinfectants?

The following are the effective disinfectants: Chlorine. Chlorine is one of the most effective disinfectants, as it has a broad spectrum of antimicrobial activity. It is highly effective against bacteria, viruses, and fungi, among other microorganisms. Iodine. Iodine is another effective disinfectant, but it has a narrow range of antimicrobial activity. It is highly effective against bacteria, viruses, and fungi.Alcohol. Ethanol and isopropanol are two types of alcohol that are commonly used as disinfectants. They have broad-spectrum antimicrobial activity, making them effective against bacteria, viruses, and fungi.

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The chemical formulas for these compounds:
a. Tin(II) hydroxide: Sn(OH)₂
b. Barium fluoride: BaF₂
c. Tetraiodide nonoxide: I₄O₉
d. Iron(III) oxalate: Fe₂(C₂O₄)₃

A set of guidelines used to produce systematic names for chemical compounds is known as a chemical nomenclature. The International Union of Pure and Applied Chemistry (IUPAC) developed and produced the nomenclature that is most frequently used globally.

The Red Book and Blue Book, respectively, are two publications that contain the IUPAC's rules for naming organic and inorganic compounds. A fourth book, the Gold Book, defines many of the technical terms used in chemistry, while a third, the Green Book, advises the use of symbols for physical quantities (in conjunction with the IUPAP). There are comparable compendia for clinical chemistry (the Silver Book), analytical chemistry (the Orange Book), macromolecular chemistry (the Purple Book), and biochemistry (the White Book, in association with the IUBMB).

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The chemical formulas for each of the following compounds:

a. Tin(II) hydroxide:
Tin(II) indicates that tin has a charge of +2. Hydroxide has a charge of -1. To balance the charges, we need two hydroxide ions for each tin ion.
Chemical formula: Sn(OH)₂

b. Barium fluoride:
Barium has a charge of +2, while fluoride has a charge of -1. To balance the charges, we need two fluoride ions for each barium ion.
Chemical formula: BaF₂

c. Tetraiodide nonoxide:
Tetra- means 4 and nona- means 9. So, there are 4 iodide atoms and 9 oxide atoms in the compound.
Chemical formula: I₄O₉

d. Iron(III) oxalate:
Iron(III) indicates that iron has a charge of +3. Oxalate is a polyatomic ion with a charge of -2. To balance the charges, we need two iron ions and three oxalate ions.
Chemical formula: Fe₂(C₂O₄)₃

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Answer:

See explanation

Explanation:

The magnitude of electronegativity difference between atoms in a bond determines whether that bond will be polar or not.

If the electronegativity difference between atoms in a bond is about 1.7, the bond is ionic. If the electronegativity difference is greater than 0.4 and less than 1.7, the bond will have a polar covalent character. Lastly, if the electronegativity difference between the bond is less than or equal to 0.4, the covalent bond is non polar.

The electronegativity difference between carbon and hydrogen is about 0.4 which corresponds to a nonpolar covalent bond hence the molecule is nonpolar.

The electronegativity difference between carbon and fluorine is about 1.5 indicating a highly polar bond. This gives CH3F an overall dipole moment thereby making the molecule polar.

Answer:

Your answer is D. All of the above

Explanation:

They are all the same answers just worded differently.

The molality of potassium chloride in a solution that which contains 25 g of potassium chloride in 120 g of water is  2.618 molal.

Molal concentration is defined as a measure by which concentration of chemical substances which are  present in a solution are determined. It is defined in particular reference to solute concentration  which is present in a solution . Most commonly used unit for molar concentration is moles/liter.

The molal concentration depends on the  change in volume of the solution which is mainly due to thermal expansion. Molal concentration is calculated by the formula, molal concentration=mass/ molar mass ×1/mass of solvent in kg.

On substitution in formula, molal concentration= 25/79.55×1/0.120=2.618 molal.

Thus, the molality is 2.618 molal.

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One mole of ring form of sulfur has a molecular weight of 8 × 32 g/mol = 256 g/mol and it reacts with 4 moles of molecular oxygen to make 3 moles of sulfur trioxide and 4 moles of water.

The balanced chemical equation for the reaction is:8S + 12O2 → 8SO3 + :For complete combustion, one mole of sulfur requires 12 moles of molecular oxygen.

Therefore, one mole of the ring form of sulfur requires 12/8 = 1.5 moles of molecular oxygen.However, the given question is only asking for the number of moles of molecular oxygen required when sulfur ring burns to make sulfur trioxide.

So, the number of moles of molecular oxygen required when one mole of ring form of sulfur burns to make sulfur trioxide is 1.5 × 3/8 = 0.5625 moles.

Summary:Thus, 0.5625 moles of molecular oxygen is required when one mole of ring form of sulfur burns to make sulfur trioxide.

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Claim: The color change observed in the beakers suggests a chemical reaction took place.

Evidence: When the colorless hydrogen was poured into beaker 2, the solution turned purple or pinkish, indicating a chemical change. When the solution was poured into beaker 3, the color changed back to colorless, indicating the reaction had completed. When the solution was poured into beaker 4, the hydrogen bubbled and danced around the solution, suggesting a chemical reaction was taking place. When the solution was poured into beaker 5, it became very cloudy, indicating a chemical reaction had occurred. Finally, when the solution was poured into beaker 6, the color changed to pinkish and became not clear, further suggesting a chemical reaction.

Reasoning: Chemical reactions often involve a change in color or the formation of a precipitate, which was observed in the different beakers. The observations made in the beakers suggest that a chemical reaction occurred, and this is consistent with the idea that a reaction between the hydrogen and the solution in the beakers took place. Therefore, it is reasonable to conclude that a chemical reaction took place in the beakers.

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Answer:

A bullet is a projectile, usually containing lead, fired through a rifle or handgun barrel. A slug is a solid projectile, usually of lead, fired through a shotgun barrel. Shot is a group of lead, steel, tungsten alloy, or bismuth pellets fired through a shotgun barrel.

Answer:

G - H2SO4

Explanation:

two hydrogen atoms and 4 oxygen atoms

Answer: 89.0 nanometers

Explanation:  0.000000089 is 8.9x10^-8 m.  I don't think there is a metric prefix for 10^-8.  The term for 10^-9 is nano-  .  If we rewrite 8.9x10^-8 m as 89.ox10^-9 m,, it would be 89.0 nanometers.

The units would be best suited for a measurement of 0.000000089 meters is nanometers.

There are many units used to measure length or distance of substance are given below as.

Picometer = 10∧-12 meters

Nanometer = 10∧-9 meters

micrometer = 10∧-6 meters

milimeter = 10∧-3 meters

centimeter = 10∧-2 meters

decimeter = 10∧-1 meters

decameter = 10 meters

Kilometer = 10∧3 meters

Calculation,

0.000000089 meters = 89/10∧9 = 89 × 10∧-9 = 89 nanometers.

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