the most characteristic property of the noble gases is that they

Answer:

true pls mark brainiest

Explanation:

Cold packs release cold is not an endothermic reaction as it absorbs heat from the surroundings.

Endothermic reaction is a reaction that absorbs heat from the surrounding to form a product .the entropy of the surrounding decreases.in endothermic reaction enthalpy change is positive.since hot packs release heat it involves endothermic reaction.it is a type of enterogenic reaction.it involves decrease in temperature as it absorb heat  from the enviroment.it stores energy in the form of reaction.bond breaking requires energy while bond making release energy.Enthalpy change is the amount of energy absorbed in a reaction carried out at a constant pressure.Entropy is the measure of the disorder of the system.this explains hotpack release hot is a endothermic reaction and cold pack won't release cold.

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Answer:

Cold absorbs heat

Explanation:

Endothermic means accompanied by or requiring the absorption of heat, this view is not accurate because cold absorbs heat.

5.22 moles of helium have a mass of 20.9 g.

The molar mass is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule.

We have 5.22 moles of helium and we want to convert it to grams. We will use the following expression.

m = n × M

m = 5.22 mol × 4.00 g/mol = 20.9 g

where,

5.22 moles of helium have a mass of 20.9 g.

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Carboxylic acids are organic acids that contain the carboxyl functional group (–COOH) as their structural feature.  the structures of the carboxylic acids with the formula C6H12O2 that contain an ethyl group branching off the main chain are pentanoic acid and 3-methylbutanoic acid.

They can be found in various organic materials such as fruits, fats, and oils. The structure(s) of carboxylic acids with the formula C6H12O2 that contain an ethyl group branching off the main chain can be represented as follows:Two isomers can be possible for the given formula C6H12O2. They are pentanoic acid and 3-methylbutanoic acid.Pentanoic acid has a straight-chain of five carbon atoms (pentane) with a carboxyl group at one end and an ethyl group branching off from the fourth carbon atom. The structure of pentanoic acid is as follows:3-Methylbutanoic acid is a branched-chain carboxylic acid in which the carboxyl group is attached to the third carbon atom of a four-carbon chain, with an ethyl group attached to the second carbon atom. The structure of 3-methylbutanoic acid is as follows:Therefore, the structures of the carboxylic acids with the formula C6H12O2 that contain an ethyl group branching off the main chain are pentanoic acid and 3-methylbutanoic acid.

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Answer: true

Asexual reproduction is the process by which an organism is produced from a single parent cell. There are four major forms of asexual reproduction - budding, binary fission, regeneration and parthenogenesis. ... Regeneration is a type of asexual reproduction in which the organism is capable of regrowing certain body parts.

Explanation:

id k what u r talking abt but hope this helps

Answer:

I think he was right but not explaining

Explanation:

I think it is C cause.... the volume of a material is the amount of matter that matterial can hold. it should the the amount of space the whole material takes up.

so C is the answer.

pls make this the brainliest.

not because it is, but because I asked.

Jasmine's velocity was 2.8 meters per second. However, we don't know if this was enough to catch up with her friend who was rollerblading at 12 meters per second.

What is Velocity?

The pace at which the position of an object changes with respect to time is known as its velocity. Due to the fact that it is a vector quantity, it possesses both magnitude and direction.

Mathematically, velocity is expressed as:

velocity = displacement / time

where displacement is the change in an object's position from one point to another, and time is the duration of the motion. Velocity is measured in units of distance per time, such as meters per second (m/s) or kilometers per hour (km/h).

To calculate Jasmine's velocity, we need to use the formula:

velocity = distance / time

Jasmine ran a distance of 98 meters in 35 seconds, so her velocity is:

velocity = 98 meters / 35 seconds

velocity = 2.8 meters per second

Therefore, Jasmine's velocity was 2.8 meters per second. However, we don't know if this was enough to catch up with her friend who was rollerblading at 12 meters per second.

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Answer:

B. with more motion of particles within a substance.

Answer:

B. with more motion of particles within a substance.

Hope this helps!

Answer:

Convection

Explanation:

▶ Convection is the transfer of heat through a gas or a liquid. The gas in this case would be the air passing through the heat and moving in a large quantity that then heats the hair.

It may be all of the above since the hair dryer is using both convection and conduction produce hot air but it says clearly so im assuming its Convection.

Brainly is appreciated! Hope I helped!

The dispersion and mixing of particles would be made easier through the application of ultrasonic waves.

Ultrasonic waves can facilitate the dispersion and mixing of particles in an experimental procedure. When ultrasonic waves are applied, they generate high-frequency sound waves that create alternating compression and rarefaction waves in a liquid medium.

These waves produce tiny bubbles due to the phenomenon of cavitation. During cavitation, the bubbles rapidly expand and collapse, creating localized areas of high pressure and temperature.

This process exerts mechanical forces on the surrounding particles, leading to their effective dispersion and mixing. The energy from ultrasonic waves helps to break down agglomerates, disperse fine particles, and enhance the overall homogeneity of the mixture.

The application of ultrasonic waves can be particularly beneficial in procedures such as sample preparation, emulsification, dispersion of nanoparticles, and dissolution of substances. It improves the efficiency and effectiveness of processes that require uniform distribution and thorough mixing of components.

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Answer:

I think it's unbalanced

(I'm so sorry if it's wrong)

Hope this helps!

Answer:

unbalanced

Explanation:

Answer:

14.594% Iron and 85.406% Sulfur

Explanation:

103g (S) + 17.6g (Fe) = 120.6g total mass

103/120.6 × 100 = 85.406% Sulfur

17.6/120.6 × 100 = 14.594% Iron

Answer:

I need more points but I think it is 84737

Explanation:

The mass of sodium hydroxide (NaOH) produced from the complete decomposition of x grams of sodium bicarbonate is zero.

The chemical equation for the decomposition of sodium bicarbonate (NaHCO₃) into sodium carbonate (Na₂CO₃), carbon dioxide (CO₂), and water (H₂O) is given as follows:

2NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(l)

As per the given chemical equation, 1 mole of sodium bicarbonate produces 1 mole of sodium carbonate, 1 mole of carbon dioxide, and 1 mole of water. Therefore, the number of moles of sodium hydroxide produced from the complete decomposition of x grams of sodium bicarbonate would be zero because sodium hydroxide is not produced in this reaction.

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Answer:

Hey!

Your answer is definitely A!

Explanation:

Hope this helps!

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In an ecosystem,  the following is a consequence of urban heat islands which is  increased precipitation downwind of the city.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

Without the sun's energy, biological life would not be able to exist to decompose. Many microbes and fungi do their best work out of direct sunlight.

In an ecosystem, microbes make use of solar energy to decompose dead plant and animals.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.

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The molar mass of insulin is approximately 0.798 g/mol, calculated using the equation for osmotic pressure and the given values of mass and volume.

To calculate the molar mass of insulin, we can use the equation for osmotic pressure:

π = (n/V)RT

where π is the osmotic pressure, n is the number of moles of solute, V is the volume of the solution in liters, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert the given values to appropriate units:

25.0 mg = 0.025 g
5.00 mL = 0.005 L

Next, rearrange the equation to solve for n (number of moles):

n = (πV) / (RT)

Substituting the given values:

n = (15.5 mmHg * 0.005 L) / ((0.0821 L·atm/(mol·K)) * 298 K)

Calculate n:

n ≈ 0.0313 mol

Finally, divide the mass of insulin (0.025 g) by the number of moles (0.0313 mol) to find the molar mass:

Molar mass = 0.025 g / 0.0313 mol

Molar mass ≈ 0.798 g/mol

So, the molar mass of insulin is approximately 0.798 g/mol.


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If a gas is cooled from 323.0 K to 273.15 K and the volume is kept constant, 0.77 atm is the final pressure, in atm, would result if the original pressure was 750.0 mmHg.

The force delivered perpendicularly to an object's surface per unit area across which the force is dispersed is known as pressure (symbol: p / P).[1]: 445  The pressure proportional to the surrounding air is known as gauge pressure, also spelt gauge pressure[a].

Pressure is expressed using a variety of units. Some of these are calculated by dividing a unit of force by a unit of area; for instance, the metric system's unit of pressure, a pascal (Pa), is equal to one newton every square metre (N/m2).

P₁/T₁  = P₂/T₂

P₂ = P₁T₂/T₁

  = 0.91 atm × 273.15 K / 323 K

  = 0.77 atm

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Answer: Aluminum is ideal for aircraft manufacture because it's lightweight and strong.

Explanation:

\(KCl(ag) + AgNO_3(aq)\) → \(KNO_3(aq) + AgCl(s)\) is the precipitation reactions.

A precipitate is an insoluble substance. A reaction in which insoluble solid precipitate is formed is called Precipitation Reaction.

For example, When Sodium Sulphate solution is mixed with Barium Chloride solution It forms Barium Sulphate and Sodium Chloride solution.

Precipitation reactions are usually double displacement reactions involving the production of a solid form residue called the precipitate.

These reactions also occur when two or more solutions with different salts are combined, resulting in the formation of insoluble salts that precipitate out of the solution.

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Answer:

0.1M

Explanation:

Using Neutralisation formula,

MaVa=MbVb

>>(0.25)(40)=Mb(100)

Mb=0.1M

Explanation:

the last CH2 should CH3

because the first and last carbons are bonded to three hydrogens

A number that tells how many molecules there are of a certain compound is called a(n) coefficient.

A subscript is a small-sized variety on the bottom right of the image. It refers to the number of atoms of the detail. If the subscript seems on the lowest left of the image, it offers the detail's atomic range.

The chemical formulation which represents the actual range of atoms of every detail present in a molecule is called molecular formula.

The coefficients suggest the range of each substance worried inside the response and may be changed so that it will stabilize the equation. The coefficients deliver the number of molecules worried inside the response.

In the example reaction,  molecules of hydrogen react with one molecule of oxygen and convey molecules of water. second: the coefficients deliver the range of moles of every substance concerned within the reaction.

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Answer:

\({ \bf{PV= \frac{m}{M} RT}} \\ \\ { \tt{(0.65 \times 23.52) = \frac{25}{M} \times 0.081 \times (25 + 273)}} \\ \\ M = 39.5 \: g\)

Answer:

When we talk about a compound's mass percent, we want to know how much of that chemical is in a combination or sample. To calculate the mass percent, we must first know how much of the compound we have and how much of everything else we have.

Assume we have a dish of fruits that weights 100 grammes. We'd want to know how much of the fruit is made up of kiwis. We count the kiwis and discover that there are twenty of them.

To calculate the mass % of kiwis, we must first determine how much they weigh in comparison to the rest of the fruits. Assume the kiwis weigh 40 grammes in total. We may use this data to compute the percentage of kiwis in the fruit:

Mass percent of kiwis = (mass of kiwis ÷ total mass of fruits) × 100%

Mass of kiwis = 40 grams

Total mass of fruits= 100 grams

Mass percent of kiwis= (40 grams ÷ 100 grams) × 100% = 40%

So we can say that the fruits is 40% kiwis.

Similarly, when we want to find the mass percent of a compound in a mixture or sample, we need to know how much of that compound we have and how much of everything else we have. We can use the formula I gave earlier to calculate the mass percent of the compound.

which is Mass percent = (mass of compound consumed ÷ total mass of sample) × 100%

Below here is the answer, but i suggest you should give it a try first :)

Molar mass of the compound = 20 grams/mole

Mass of the compound consumed = 2 moles × 20 grams/mole = 40 grams

Total mass of the sample or mixture = 50 grams

Mass percent of the compound = (40 grams ÷ 50 grams) × 100% = 80%

So the mass percent of the compound in the sample is 80%.

It is true that electromagnetic waves can travel in empty space or space that has no particles.

The correct option is True.

Waves of the electromagnetic field make up electromagnetic radiation; they travel through space while carrying momentum and radiant energy. It consists of X-rays, gamma rays, microwaves, infrared, light, and radio waves.

Electromagnetic waves include radio waves, television waves, and microwaves. The only thing separating them is the wavelength. The wavelength is the distance between each wave's peak and the next.

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Answer:

367.1 cm³

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 300 cm³

Initial temperature (T₁) = 40 °C

Final temperature (T₂) = 110 °C

Final volume (V₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273.15

Initial temperature (T₁) = 40 °C

Initial temperature (T₁) = 40 °C + 273.15

Initial temperature (T₁) = 313.15 K

Final temperature (T₂) = 110 °C

Final temperature (T₂) = 110 °C + 273.15

Final temperature (T₂) = 383.15 K

Finally, we shall determine the final volume (i.e the new volume) of the balloon. This can be obtained by using the Charles' law equation as illustrated below:

Initial volume (V₁) = 300 cm³

Initial temperature (T₁) = 313.15 K

Final temperature (T₂) = 383.15 K

Final volume (V₂) =?

V₁/T₁ = V₂/T₂

300 / 313.15 = V₂ / 383.15

Cross multiply

313.15 × V₂ = 300 × 383.15

313.15 × V₂ = 114945

Divide both side by 313.15

V₂ = 114945 / 313.15

V₂ = 367.1 cm³

Therefore, the new volume of the balloon is 367.1 cm³

Concentrated sulfuric acid does not produce hydrogen ions because it undergoes a chemical reaction with water to produce hydronium ions.

It is important to note that the concentration of sulfuric acid determines the strength of the acid, but it does not determine the production of hydrogen ions.

Sulfuric acid is a strong acid that ionizes completely in water, producing hydronium ions and sulfate ions. It is highly soluble in water, which makes it an effective desiccant. The acid also reacts with organic materials and can cause severe burns when it comes into contact with the skin or eyes.

Concentrated sulfuric acid reacts with water in a highly exothermic reaction that produces a large amount of heat. The heat produced by the reaction is sufficient to vaporize the water, which leads to the production of a white fog of sulfuric acid and water vapor.

The production of this fog is a common demonstration of the highly exothermic nature of the reaction between concentrated sulfuric acid and water.The reaction between concentrated sulfuric acid and water can be represented by the following chemical equation:

H2SO4 + H2O → H3O+ + HSO4-

Here, the sulfuric acid reacts with water to produce hydronium ions and bisulfate ions. The bisulfate ions are formed as a result of the protonation of the sulfate ions produced by the ionization of the sulfuric acid. It is important to note that the production of hydronium ions is a characteristic of all acids and that the concentration of the acid determines the strength of the acid, not the production of hydrogen ions.

Therefore, it can be concluded that concentrated sulfuric acid does not produce hydrogen ions. Instead, it undergoes a chemical reaction with water to produce hydronium ions.

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Answer:

speed inscreases mass decrreases, but when no friciton mass dont matter

Explanation:

Mass does not affect speed directly, but it does affect how fast an object can change its speed by accelerating or decelerating. Objects with larger masses require more time for acceleration or deceleration compared to lighter objects. The law of inertia states that objects that are still remain still and that objects in motion remain in motion regardless of the object's mass.