A sample of a substance has a mass of 4.2 grams and a volume of 6 milliliters

Answer:

1.3 atm

Explanation:

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

(P1 x V1) / (T1) = (P2 x V2) / (T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, and P2, V2, and T2 are the final pressure, volume, and temperature of the gas.

We are given:

P1 is what we want to find

V1 = 839 mL

T1 = 45 degrees Celsius = 318 K

V2 = 1032 mL

T2 = 58 degrees Celsius = 331 K

P2 = 1.9 atm

Plugging these values into the formula, we get:

(P1 x 839 mL) / (318 K) = (1.9 atm x 1032 mL) / (331 K)

Simplifying and solving for P1, we get:

P1 = (1.9 atm x 1032 mL x 318 K) / (839 mL x 331 K)

P1 = 1.3 atm (rounded to one decimal place)

Therefore, the original pressure of the oxygen sample was 1.3 atm.

Non-combustible

eg:-glass,water,stone, Portland cement etc ...

Answer:

Noncombustible

Explanation:

So

Some examples are ,glass ,stone

Answer:

it helps bring energy to earth

The qualitative term for a solution containing solute at a relatively low concentration is dilute.A solution is a homogeneous mixture of two or more substances.

It consists of a solute that is dissolved in a solvent. There are different types of solutions based on the amount of solute dissolved in a solvent. These types include a dilute solution, a concentrated solution, and a saturated solution. Let's look at the meaning of the dilute solution.

A solution that contains a low concentration of a solute is called a dilute solution. It has a lesser amount of solute dissolved in a solvent. The quantity of solute in a solution is expressed in terms of its concentration. Dilute solutions are often prepared by adding solvent to a concentrated solution. When a solute is added to a solvent, it dissolves to form a solution. As more and more solute is added, the solution's concentration increases.

Concentration is the measure of the amount of solute present in a solution. It can be expressed in qualitative or quantitative terms. Qualitative terms describe a solution as dilute or concentrated based on the amount of solute present in a solution. On the other hand, quantitative terms specify the exact amount of solute present in a solution. This is expressed in units such as parts per million (ppm), molarity (M), and mole fraction (x).

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Answer:

A. 7

(assuming the water is neutral)

Answer:

mushroom

mold

spore cases

hyphae

fungus

Answer:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Explanation:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

During the Pliocene epoch, which saw the arrival of Homo habilis, a possible ancestor of modern homo sapiens, and when herds of enormous, elephant-like mammals first appeared, atmospheric CO2 levels may have been comparable to those of today as recently as between 2 and 4.6 million years ago.

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Answer: D is right

Explanation: One mole contains 6.0225 ·10^23 molecules

Despite of the substance

Answer:

Explanation:

given mass on earth =98 kg

gravitational pull on mars =3.711 m/s2

gravitational pull on venus =8.87 m/s2

weight of the body on mars =weight on earth/9.81 m/s2 *3.711 m/s2

W=98 kg*3.711 /9.81m/s2

W=37.07 kg

weight on the venus =weight on earth*8.87 m/s2 /9.81 m/s2

W= 98 kg*7.87 m/s2/9.81 m/s2

W=78.62 kg

In a compression, the particles in the air are arranged closer together than in a normal state, resulting in an increase in air pressure.

In a rarefaction, the particles in the air are arranged further apart than in a normal state, resulting in a decrease in air pressure.

What is compression?

The increase in pressure is due to the collisions between the particles becoming more frequent, which leads to an increase in the number of particles in a given volume. This can occur due to the presence of a sound wave, for example, which causes alternating regions of high and low pressure in the air.

What is rarefaction?

This occurs because the particles are moving farther away from each other due to a decrease in the number of collisions between them. This can also occur due to the presence of a sound wave, where the alternating regions of high and low pressure cause the particles to move back and forth, resulting in areas where the particles are further apart than usual.

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Complete question is: In a compression, the particles in the air are arranged closer together than in a normal state, resulting in an increase in air pressure and In a rarefaction, the particles in the air are arranged further apart than in a normal state, resulting in a decrease in air pressure.

Answer:

loss of mass

Explanation:

your welcome :)

Answer:

thank you for this oibnki

Answer:

Sure I'll go ahead and like your answers and follow you if that's what you wanted! :)

Explanation:

fluorine, chlorine, bromine, and iodine,

Answer:

5.ethanol and carbon dioxide

6.it contains ethyl alcohol which can be effective at killing viruses and bacteria

Answer:

Atomic particles

Explanation:

A scanning tunneling microscope is an instrument used to view any surfaces at the levels of an atom. It was invented in the nineteenth century.

Fructose and Glucose cannot be distinguish by \(BR_{2}\) /\(H_{2}\)O and Glucose and mannose are anomers.

Since they cannot be hydrolyzed into smaller carbs, monosaccharides are the most basic types of carbohydrates. They are chemically defined as aldehydes or ketones with two or more hydroxyl groups, and they play a crucial role in the production of fuel molecules, or glycolysis, as well as nucleic acids.

Monosaccharides are carbohydrates that cannot be further hydrolyzed to produce a simpler molecule of polyhydroxy aldehyde or ketone.

\(BR_{2}\) /\(H_{2}\)O can be used to differentiate between glucose and fructose because fructose doesn't react with \(BR_{2}\) /\(H_{2}\)O. Fehling's solution can distinguish between glucose and fructose because it only produces a good test result for aldehydes, such as glucose.

Mannose and glucose are epimers because they only vary at C-2, the first asymmetric carbon atom.

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The complete question is:

What is not true about monosaccharides?

a. Optically active polyhydroxy carbonyl compounds.

b. Fructose and Glucose cannot be distinguish by \(BR_{2}\) /\(H_{2}\)O

c. Glucose and mannose are anomers.

d. Fructose and Glucose cannot be distinguish by Fehling's solution.

Answer:

Explanation:

3 )

18 grams of water contains 16 grams of oxygen .

Let the grams of oxygen needed be m .

yield is 75%

Only 75 % of m will make water .

.75 m will form water .

water formed by .75 m of oxygen = 18 / 16 x .75 m

Given that

18 / 16 x .75 m = 79

m = (16 x 79) / ( 18 x .75 )

= 93.63 grams .

So oxygen required is 93.63 grams .

4 )

One mole of water contains 0.5 moles of oxygen.

2 moles of oxygen will make 2 /,5 = 4 moles of water .

percent yield is 82 % ,

so water produced = .82 x 4 = 3.28 moles of water.

The necessary voltage to power the electrolysis of molten sodium chloride is approximately 4.0 volts.

To determine the necessary voltage for the electrolysis of molten sodium chloride, you need to consider the standard reduction potentials of the two half-reactions involved. The half-reactions are as follows:

1. 2Cl⁻ → Cl₂ + 2e⁻\(2Cl^{⁻} =Cl_{2} + 2e^{⁻}\) (Oxidation, Chlorine production)

2. 2Na⁺ + 2e⁻ → 2Na \(2Na^{+} + 2e^{-} =2Na\)(Reduction, Sodium production)

The standard reduction potential of Cl⁻ to Cl₂ is +1.36 volts, and the standard reduction potential of Na⁺ to Na is -2.71 volts. To determine the voltage necessary for electrolysis, you need to add the reduction potential of the oxidation half-reaction (which is the opposite of the reduction potential) to the reduction potential of the reduction half-reaction:

Voltage = (+1.36 volts) - (-2.71 volts) = 1.36 + 2.71 = 4.07 volts

Considering two significant figures, the necessary voltage is 4.0 volts.

To power the electrolysis of molten sodium chloride, a voltage of approximately 4.0 volts is needed.

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1. The number of valence electrons the atom have is seven (7).

2. The atom is reactive

Valence electron is simply defined as the number of electron(s) present in the outermost shell of an atom.

Considering the diagram given from the question, the number of electrons in the outermost shell is seven (7).

Thus, we can conclude that the valence electron the atom have is seven (7)

From the diagram given, we determine that the number of valence electrons present is 7. This means that the atom required 1 more electron to complete its octet configuration.

Thus, the atom will be very reactive in order to quickly attain a stable configuration.

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For 80% of the reactant to break down, it will take 31.5 seconds on average.

One reactant decomposing into two or more products is known as a decomposition reaction. The all-inclusive formula AB A + B can be used to represent this.

It is possible to express the rate law for reactant A's breakdown as follows:  rate = k[A]

The integrated rate law for a first-order reaction is: ln([A]/[A]0) = -kt

When we enter this together with the supplied values into the integrated rate law, we obtain:

ln(0.20) = -0.0092 s⁻¹ * t

Solving for t, we get:

t = -ln(0.20) / 0.0092 s⁻¹

t = 31.5 seconds

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Answer:

174.94 sec

Explanation:

ln [A] = ln[A]o -kt

If 80% of the reactant has decomposed, that means that 20% of the reactant remain. Since the rate (k=.0092s^-1) has a unit of s^-1, 23 know its a first order, so we use:

ln [A] = ln[A]o -kt

ln (20) = ln (100) - (0.0092)t

ln(.2)/.0092 = t

174.94 sec = t

: 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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The main answer to the question is that 3.4 L of Cl2 would be required to react with 6.8 L of NO2, as the stoichiometry of the balanced equation shows that the ratio of Cl2 to NO2 is 1:2.

The balanced chemical equation shows that for every 1 molecule of Cl2, 2 molecules of NO2 are required to produce 2 molecules of NO2Cl. Therefore, in order to react with 6.8 L of NO2, we would need half as much Cl2, or 3.4 L. This assumes that the temperature and pressure are constant and that the reactants are behaving ideally.

According to the balanced chemical equation, 2NO2(g) + Cl2(g) → 2NO2Cl(g), 2 moles of NO2 react with 1 mole of Cl2. Since the volumes are measured at the same temperature and pressure, we can use the molar ratios directly. To calculate the volume of Cl2 required, divide the volume of NO2 by the ratio of their coefficients (2:1):

Volume of Cl2 = (Volume of NO2) / 2
Volume of Cl2 = 6.8 L / 2
Volume of Cl2 = 3.4 L

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The skin of grapes contains an antioxidant called resveratrol. Determine the resveratrol functional groupings. Alcohol makes comprises the compound's functional group.

An organic molecule known as an alcohol has at least one hydroxyl functional group attached to a saturated carbon atom. The major alcohol ethanol, which is used as a narcotic and is the main alcohol contained in alcoholic beverages, was the substance to which the term "alcohol" originally referred.

Resveratrol is a naturally occurring polyphenol that can be found in a variety of foods, including grapes, berries, peanuts, and several medicinal plants. It has a stilbene functional group in its molecular structure.

Thus, The skin of grapes contains an antioxidant called resveratrol. Determine the resveratrol functional groupings. Alcohol makes comprises the compound's functional group.

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The correct answer is 8. To determine the number of hydrogen atoms (H) in (NH4)2CO3, we need to count the number of H atoms in each of the constituent ions and then multiply by the number of ions present in the formula.

The (NH4)2CO3 formula contains two ammonium ions (NH4+) and one carbonate ion (CO32-). Each ammonium ion contains four hydrogen atoms, while the carbonate ion contains no hydrogen atoms.

Therefore, the total number of hydrogen atoms in (NH4)2CO3 is:

2 ammonium ions x 4 hydrogen atoms per ammonium ion = 8 hydrogen atoms

Thus, the correct answer is 8.

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A soil texture triangle is used to classify a soil's texture class. The percentages of sand, silt, and clay are scaled on the sides of the soil texture triangle.

Clay percentages are read across the triangle from left to right (dashed lines). The soil texture triangle identifies soil based on the amount of clay, silt, and sand. The angle of the numbers indicates the direction of the lines for each type of particle.

Clay lines, for example, go straight across, silt lines run diagonally down, and sand lines run diagonally up. M. Whitney of the USDA invented the textural triangle method in 1911 [21]. The USDA ternary diagram is divided into 12 textural classifications based on soil fraction %.

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Answer:

Both crayon melting in the sun and beating an egg are examples of physical changes. In both cases, the chemical composition of the substances does not change. Instead, the changes are physical in nature. When a crayon melts in the sun, it changes from a solid to a liquid, but it is still made up of the same molecules. Similarly, when an egg is beaten, it changes from a liquid to a mixture of liquids and solids, but the chemical composition of the egg does not change.

Explanation:

The numbering system simply reflects the order of their discovery and does not imply a systematic progression or specific functional differences between them.

KV1 Channels: KV1 channels, also known as Shaker-related channels, are one of the earliest identified subtypes of potassium channels. They play a crucial role in regulating neuronal excitability. They are widely expressed in various tissues, including the nervous system, heart, and skeletal muscle.

KV2 Channels: KV2 channels are another subtype of potassium channels found in neurons. They exhibit distinct biophysical properties compared to KV1 channels. KV2 channels are involved in regulating neuronal firing patterns and neurotransmitter release.

KV3 Channels: KV3 channels, also known as Shaw-related channels, are a group of high-threshold, fast-activating/deactivating potassium channels. They are predominantly expressed in neurons, especially in regions involved in the generation of high-frequency action potentials, such as auditory neurons and certain types of interneurons.

KV4 Channels: KV4 channels belong to the A-type potassium channel family. They are characterized by their rapid activation and inactivation kinetics. KV4 channels are widely expressed in the brain, heart, and other tissues. In the brain, they are involved in regulating neuronal excitability and synaptic transmission.

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