125 cm3 of a solution contains 0.25 moles of the solute. What is the concentration of the solution?

Answer:

I'm sorry but I need points

Based on the periodic table, the element that is most reactive is Na.

The correct option is A.

Reactivity is a gauge of an element's propensity to create compounds with other elements. While certain elements require energy to react and are inert, others will do so simply and spontaneously. Reactivity is a gauge of an element's propensity to create compounds with other elements.

Reactive elements are the Group 1 and Group 2 metals. Also, the Group 17 and Group 16 non-metals are reactive non-metals.

Group 1 and Group 2 metals form positive ions easily by electron loss. Group 17 and Group 16 non-metals form negative ions by electron gain.

Learn more about reactive elements at: https://brainly.com/question/25380167

#SPJ1

Strain to failure increases with degree of crystalization because of the nature of the crystalline structure.

When a material is crystallized, the atoms are arranged in a regular, repeating pattern. This leads to a stronger and more ordered material, which can withstand greater stress before breaking or deforming.

There are several factors that contribute to the increased strain to failure of crystallized materials. First, the regular atomic structure of the crystal means that there are fewer defects or imperfections in the material. These defects can act as weak spots, causing the material to fail at lower levels of stress. By minimizing the number of defects, the crystal is able to withstand higher levels of stress before failing.

Additionally, the ordered structure of the crystal also means that the atoms are more closely packed together. This leads to stronger interatomic bonds, which can resist deformation and maintain the material's shape under stress. As the degree of crystalization increases, these bonds become stronger and more numerous, allowing the material to withstand greater levels of strain before breaking or deforming.

To learn more about crystalization, click here:

https://brainly.com/question/4155452

#SPJ11

Answer:

Explanation:

Chemistry is often referred to as the central science because it joins together physics and mathematics, biology and medicine, and the earth and environmental sciences. Knowledge of the nature of chemicals and chemical processes therefore provides insights into a variety of physical and biological phenomena.

Answer:

Science chemistry is the investigation of issue, examining its design, properties and conduct to see what happens when they change in substance responses. Thusly, it very well may be viewed as a part of actual science, close by stargazing, physical science and studies of the planet including geography.

Explanation:

.Science chemistry is fundamental for meeting our essential requirements of food, clothing, cover, wellbeing, energy, and clean air, water, and soil. Substance advances improve our personal satisfaction in various ways by giving new answers for issues in wellbeing, materials, and energy use.

Here are the absolute best motivations to concentrate on science.

,Science assists you with figuring out your general surroundings. ...

,,Essential information on science assists you with perusing and

comprehend item marks.

,,,Science can assist you with pursuing informed choices. ...

,,Science is at the core of cooking. ...

,,,An order of science can assist with guarding you

Answer:

Simple distillation is the method used to separate substances in mixtures with significantly different boiling points, while fractional distillation is used for mixtures containing chemicals with boiling points close to each other.

Answer:

66.5% (3 s.f.)

Explanation:

Please see the attached pictures for the full solution.

*Mr stands for relative formula mass

Answer:

12,375 cm³

Explanation:

v=l×w×h

Since there are 3 books the equation would then be

v=3(l×w×h)

v=3(25×15×11)

v=3(4,125)

v=12,375 cm³

Answer:

100 m of KCL

Explanation:

This is because it is a more reactive metal and higher in the electro reactivity series which lead us to believe that it will take a longer time to heat along with the fact that it is lower in the periodic table and is a metal

Answer:

La distancia recorrida por el móvil es 228.600 m

Explanation:

El movimiento rectilíneo uniforme MRU es el movimiento que describe un cuerpo o partícula a través de una línea recta a velocidad constante. Es decir:, en este caso el movimiento es lineal en una única dirección  y la velocidad de desplazamiento es constante.

La velocidad es una magnitud física que expresa la relación entre el espacio recorrido por un objeto y el tiempo empleado para ello mediante la expresión:

\(velocidad=\frac{distancia}{tiempo}\)

En este caso:

Reemplazando:

\(25 \frac{m}{s} =\frac{distancia}{9144 s}\)

y resolviendo obtienes:

distancia= 25\(\frac{m}{s}\) *9144 s

distancia= 228.600 m

La distancia recorrida por el móvil es 228.600 m

A movement is rectilinear uniform when an "object" (for example) travels in a straight path at a constant speed, given that its acceleration is zero.

Velocity (v) = 25m/s

Distance (d) = ?

Time (t) = 2.54hr = 9,144 s

Looking at the data, we see that the time is in hr, but we need it in seconds. Therefore we do a conversion from hours to minutes, taking into account that 1 hour is equal to 3600 seconds.

To calculate the distance traveled by the mobile, the speed is multiplied by the time taken.

For this the following formula is applied:

We apply the data in the formula; to solve for the distance.

Answer: The distance traveled by the mobile is 228,600 meters.

The reason we learn an algebraic method to balance chemical equations instead of using a trial-and-error method is because the algebraic method is more efficient and reliable.

Using trial and error can be time-consuming and may not always lead to the correct solution. Balancing chemical equations requires ensuring that the number of atoms of each element on both sides of the equation is equal. This can become complex when dealing with more complicated equations.

The algebraic method, on the other hand, provides a systematic approach that can be applied to any chemical equation, regardless of its complexity. By applying mathematical principles and using variables, we can determine the correct coefficients to balance the equation. This method is programmable, which means we can use computer algorithms to solve equations more quickly and accurately.

Additionally, the algebraic method allows us to analyze whether a reaction can actually be balanced. It helps us understand the stoichiometry of the reaction and determine the correct ratios of reactants and products.

Contrary to the belief that it is only meant to complicate things, learning this method is essential for a deeper understanding of chemistry and problem-solving skills. It enables us to apply logical thinking and mathematical concepts to chemical reactions, which is crucial in various scientific and industrial applications.

To know more about algebraic visit-

https://brainly.com/question/953809

#SPJ11

Before testing for ions, it is required to test for complete precipitation in a supernatant solution since partial precipitation can affect how accurate the results of ion testing are.

The ions in the supernatant may react with the remaining particles if a precipitate is not entirely separated from the solution, causing erroneous findings. Prior to ion testing, checking for complete precipitation ensures that the supernatant solution is free of distracting particles and yields more precise findings.

The completion of the precipitation reaction must be verified since, if not, the leftover reactant will obstruct the other tests that will be run on the supernatant. If no additional precipitate appears after one more drop of reagent is added to the clear supernatant, the precipitation is finished.

to know more about ions click on the below link:

brainly.com/question/14982375

#SPJ4

Answer:

a full moon or new moon

Explanation:

The percent of water in Plaster of Paris is 6.2% (approx.) rounded to the nearest tenth.

It can be easily calculated using the formula:

% of water = (mass of water / total mass of compound) x 100

In this case, the molar mass of CaSO₄ · 1/2H₂O is:

1 mol Ca = 40.08 g

1 mol S = 32.06 g

4 mol O = 4 x 16.00 g = 64.00 g

1/2 mol H₂O = 1/2 x 18.02 g = 9.01 g

Therefore, the total molar mass of CaSO₄ · 1/2H₂O is:

40.08 + 32.06 + 64.00 + 9.01 = 145.15 g/mol

The mass of water in one mole of CaSO₄ · 1/2H₂O is 9.01 g, so the percent of water in plaster of Paris is:

% of water = (9.01 g / 145.15 g) x 100 = 6.21%

Rounding this to the nearest tenth gives:

% of water ≈ 6.2%

Therefore, the percent of water in plaster of Paris is approximately 6.2%.

To know more about the plaster of Paris refer here :

https://brainly.com/question/30452789#

#SPJ11

Answer:

Use Boyles law.

Given:

P1=3atm

V1=275mL

P2=1.8atm

V2=?

P1V1=P2V2

3x275=1.8xV2

V2=3x275/1.8

V2=458.3mL

There are no forces of attraction between the particles.

The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely from each other. In most cases, there are essentially no attractive forces between particles. This means that gas has nothing to hold a specific shape or volume.

In the physical sciences, a particle (or corpuscle in older texts) is a small localized object to which can be ascribed several physical or chemical properties, such as volume, density, or mass. They vary greatly in size or quantity, from subatomic particles like the electron to microscopic particles like atoms and molecules, to microscopic particles like powders and other granular materials. Particles can also be used to create scientific models of even larger objects depending on their density, such as humans moving in a crowd or celestial bodies in motion.

The term particle is rather general in meaning and is refined as needed by various scientific fields. Anything that is composed of particles may be referred to as particulate. However, the noun particulate is most frequently used to refer to pollutants in the Earth's atmosphere, which are a suspension of unconnected particles, rather than a connected particle aggregation.

Learn more about Particles

https://brainly.com/question/18826360

#SPJ2

Answer:

A. They often use up resources that other organisms need.

Explanation:

Invasive alien species are animals, plants, fungi and microorganisms entered and established in the environment from outside of their natural habitat. T

hey reproduce rapidly, out-compete native species for food, water and space, and are one of the main causes of global biodiversity loss.

Answer:

+ 100 Kj

Explanation:

The very minimum energy required to activate atoms or molecules to undergo chemical transformation.

Answer:

It is 60kj.

Explanation:

It is the highest point minus where a+b is at, so it is 60kj.

the lattice energy of MgH2() is 2791 kJ/mol with a series of step when the Enthalpies of formation for calcium hydrided is given.

An article publishing charge (APC) is required of authors or research funders to cover publication costs in open access journals that do not charge subscription fees. This guarantees that everyone will be able to access your article promptly and without charge in the future.

Solution:

the lattice energy of MgH2() is :

ΔHf(−75. 3 kJ/mol )  =S+0.5D+IE+EA+U

ΔHf(−75. 3 kJ/mol )= 2791 kJ/mol

The papers published in MDPI Special Issues are of extremely high quality! When I published my research with MDPI (Energies Journal), it was a wonderful experience. Both the submission of the manuscript and the timing of publishing were excellent.

To know more about energy visit

brainly.com/question/11399976

#SPJ4

A carbon dioxide molecule moves into a cell through **passive diffusion** across the cell membrane.

In more detail, passive diffusion is a process where molecules, such as carbon dioxide, move from an area of higher concentration to an area of lower concentration without requiring any energy input. This movement continues until the concentration is equal on both sides of the cell membrane. Carbon dioxide, being a small and nonpolar molecule, can easily pass through the **lipid bilayer** of the cell membrane. This process plays a crucial role in cellular respiration, as cells need to continuously remove carbon dioxide to maintain their normal functions.

Know more about passive diffusion here:

https://brainly.com/question/14505188

#SPJ11

Answer:

One of the key findings of the Kewalo Basin Marine Mammal Laboratory is that dolphins have complex social behaviors and are able to form strong bonds with other dolphins. They are able to communicate with each other using a variety of vocalizations and gestures, and they are also able to learn and mimic the behaviors of other dolphins.

Overall, the findings of the Kewalo Basin Marine Mammal Laboratory suggest that dolphins are highly intelligent animals with advanced social and cognitive abilities. These findings highlight the need for further research on dolphin intelligence and the importance of protecting these intelligent and fascinating animals.

Answer:

1.5x1020 molecules = 2.5x10-4 moles.

assuming all of the xenon has reacted, The formula of the product is XFe2

In this situation, xenon and fluorine are reacting to form a binary compound. The reaction can be viewed by the below balanced chemical equation:

Xe + 2F2 -> XeF2

The reactants, xenon and fluorine, are initially present at partial pressures of 1.24 atm and 10.10 atm, respectively.Since the reactants are initially present at a total partial pressure of 1.24 atm + 10.10 atm = 11.34 atm, and the final partial pressure of fluorine is 7.62 atm, the partial pressure of the xenon fluoride compound must be 11.34 atm - 7.62 atm = 3.72 atm.

we can set up the following equation:1.24 atm + 10.10 atm = 3.72 atm + 7.62 atm

Solving for the number of moles of fluorine gives:

10.10 atm - 3.72 atm = 7.62 atm

= 6.38 atm

Since the pressure of a gas is directly proportional to the number of moles of the gas present,

n = P / (R * T

= 6.38 atm / (0.08206 Latm/molK * 298 K / 100 mL)

= 0.5 molThe number of moles of xenon present can be calculated in a similar way:

n = P / (R * T

= 1.24 atm / (0.08206 Latm/molK * 298 K / 100 mL)

= 0.05 mol

Since the ratio of moles of xenon to moles of fluorine in the product is 1:2, the formula of the product must be XeF2.

To learn more about xenon here:

https://brainly.com/question/5516586

#SPJ4

When the pool's center is occupied by the rubber raft. Think of it as the raft's starting position.

Once it reaches the rubber raft, the raft will start to rise when the friend creates a wave by slapping the water.

The raft will really gain energy from the wave, moving upward.

The raft will return to its original place once the wave passes.

The raft will return to its original place where it was before the wave hits it because it is indicated in the question that it is immobile.

As a result, the wave won't take it to the pool's edge.

Because you are only lightly lifted by the waves or because Lee cannot be pushed to the other side of the pool, the wave won't drive the person on the raft over the edge of the pool.

To know more about waves, click on the link below:

https://brainly.com/question/11350613

#SPJ9

Answer:

The net charge on the ion is negative 1(-1)

Explanation:

Negative 1(-1)

The given chemical reaction is, 2H2O2 (aq) → 2H2O (l) + O2 (g).

It represents the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen gas (O2). This reaction is an example of a redox reaction, where both reduction and oxidation occur simultaneously.

In this case, hydrogen peroxide acts as both the oxidizing and reducing agent.

During the reaction, the oxygen in H2O2 is reduced from an oxidation state of -1 to -2 in water, while another oxygen is oxidized from an oxidation state of -1 to 0 in oxygen gas. This reaction is exothermic, meaning it releases energy in the form of heat. It can be catalyzed by various substances, such as potassium iodide, manganese dioxide, or even enzymes like catalase found in our bodies.

To summarize, the given reaction, 2H2O2 (aq) → 2H2O (l) + O2 (g), demonstrates the decomposition of hydrogen peroxide into water and oxygen gas, involving redox processes and the participation of an appropriate catalyst to speed up the reaction.

To know something about the redox reaction, click below.

https://brainly.com/question/28300253

#SPJ11

Answer:

apparent brightness

Explanation:

thats it not sure buttt

Answer:

This wide-field view of the sky around the bright star Alpha Centauri was created from photographic images forming part of the Digitized Sky Survey 2. The star appears so big just because of the scattering of light by the telescope's optics as well as in the photographic emulsion. Alpha Centauri is the closest star system to the Solar System. Image released Oct. 17, 2012. (Image credit: ESO/Digitized Sky Survey 2)

A glance at the night sky above Earth shows that some stars are much brighter than others. However, the brightness of a star depends on its composition and how far it is from the planet.

Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs. (A light-year is the distance light travels in one year — about 6 trillion miles, or 10 trillion kilometers.) Astronomers also measure luminosity — the amount of energy (light) that a star emits from its surface.

Measuring star brightness is an ancient idea, but today astronomers use more precise tools to obtain the calculation.



From Greek to modern times

More than 2,000 years ago, the Greek astronomer Hipparchus was the first to make a catalog of stars according to their brightness, according to Dave Rothstein, who participated in Cornell University's "Ask An Astronomer" website in 2003.

"Basically, he looked at the stars in the sky and classified them by how bright they appear — the brightest stars were 'magnitude 1,' the next brightest were 'magnitude 2,' etc., down to 'magnitude 6,' which were the faintest stars he could see," Rothstein wrote.

Human eyes, however, are not very discerning. Large differences in brightness actually appear much smaller using this scale, Rothstein said. Light-sensitive charged-coupled devices (CCDs) inside digital cameras measure the amount of light coming from stars, and can provide a more precise definition of brightness.

Using this scale, astronomers now define five magnitudes' difference as having a brightness ratio of 100. Vega was used as the reference star for the scale. Initially it had a magnitude of 0, but more precise instrumentation changed that to 0.3.

Orion is the brightest and most beautiful of the winter constellations. Some of its stars, including Betelgeuse and Rigel, are among the brightest stars. (Image credit: Starry Night Software)

Apparent magnitude vs. absolute magnitude



When taking Earth as a reference point, however, the scale of magnitude fails to account for the true differences in brightness between stars. The apparent brightness, or apparent magnitude, depends on the location of the observer. Different observers will come up with a different measurement, depending on their locations and distance from the star. Stars that are closer to Earth, but fainter, could appear brighter than far more luminous ones that are far away.

"It is the 'true' brightness — with the distance dependence factored out — that is of most interest to us as astronomers," stated an online course on astronomy from the University of Tennessee.

"Therefore, it is useful to establish a convention whereby we can compare two stars on the same footing, without variations in brightness due to differing distances complicating the issue."

Explanation:

HOPE IT HELPS

The scientific instruments used to heat water to 85 degree Celsius has been graduated cylinder, beaker, thermometer, and hot plate. Thus, option B is correct.

Scientific equipments have been defined as the instruments and glassware that has been used in the scientific study and experimentation.

The water has been heated to the temperature of 85 degrees Celsius. The temperature has to be monitored thus, a thermometer has been used.

The water has been measured to be 1 L, thus the graduated cylinder, and beaker has been used for the measurement and heating of water.

The heat has been provided to the beaker by placing it on a hot plate.

Thus, the scientific instruments used to heat water to 85 degree Celsius has been graduated cylinder, beaker, thermometer, and hot plate. Thus, option B is correct.

Learn more about scientific equipments, here:

https://brainly.com/question/24690874

The scientific instruments used to heat water to 85 degree Celsius has been graduated cylinder, beaker, thermometer, and hot plate. Thus, option B is correct.

Scientific equipments have been defined as the instruments and glassware that has been used in the scientific study and experimentation.

Equipments for heating the water

The water has been heated to the temperature of 85 degrees Celsius. The temperature has to be monitored thus, a thermometer has been used.

The water has been measured to be 1 L, thus the graduated cylinder, and beaker has been used for the measurement and heating of water.

The heat has been provided to the beaker by placing it on a hot plate.

Thus, the scientific instruments used to heat water to 85 degree Celsius has been graduated cylinder, beaker, thermometer, and hot plate. Thus, option B is correct.

1,392 mL is the volume of the gas at 30 °C and 210 torrs of pressure.

The combined gas law, which states that for a certain amount of gas, the product of pressure and volume is directly proportional to the absolute temperature, can be used to solve this issue.

P2V2/T2 = P1V1/T1

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

Substituting the given values:

P1 = 480 torr

V1 = 893 mL

T1 = -33°C + 273.15 = 240.15 K (converted to Kelvin)

P2 = 210 torr

T2 = 30°C + 273.15 = 303.15 K

We need to find V2.

P1V1/T1 = P2V2/T2

480 torr x 893 mL / 240.15 K = 210 torr x V2 / 303.15 K

V2 = 480 torr x 893 mL x 303.15 K / (240.15 K x 210 torr)

V2 = 1,392 mL (rounded to the nearest whole number)

to know more about pressure here;

brainly.com/question/12971272

#SPJ1