Which statement best describes a scatterplot?
A. it shows data as a percentage of a whole
B. it shows data points connected by a single line
C. it shows quantitative data that relate two variables
D. it shows qualitative data grouped by similarities

Answer:

Carpooling with just one other person means that there is one fewer vehicle on the roads. That vehicle won't be emitting greenhouse gases during that commute.

Explanation:

The average speed of water molecules at 100°C will be 715 m/s.

The average speed of a molecule is given by the following equation

Average speed = √8RT/πM

Here T is the temperature

R is the universal gas constant

M is the molar mass of the molecule

From the above equation, we can see that the average speed of a water molecule is directly proportional to the root of the temperature.

Hence, the average speed v₁ at 25 °C is ∝ √298 ......(i)

And average speed v₂ at 100 °C is ∝ √373..........(ii)

Dividing equations (i) and (ii)

v₁/v₂ = √298/√373

640/v₂ = √298/373

v₂ = 640× √373/298

v₂  = 715 m/s

Hence, The average speed of water molecules at 100°C will be 715 m/s.

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Transverse waves will be made across the top of the gelatin if you jump up and down.

Transverse waves are waves that oscillate along routes that are perpendicular to the direction in which the wave is moving forward. Examples of transverse waves include electromagnetic waves, seismic S waves, and water surface ripples. Particles in a transverse wave oscillate up and down about their mean location rather than following the wave's path of transmission.

A transverse wave is one in which each particle of the medium moves around its mean location in a direction that is the opposite of the direction in which the wave is propagating. Transverse waves are what makeup light. Only solids and the surface of liquids may generate transverse waves. They are unable to be created inside liquids or gases.

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The net force on the box would be 50 N in the upward direction.

The net force acting on an object is the resultant force acting on the object.

The net force acting on an object is the sum total of all the forces acting on the object. This is when the direction of the forces is put into consideration.

In the present problem, two forces are acting on the object. These two forces are antagonistic. One force is in the upward direction while the other is in the downward direction.

The resultant force can be calculated as:

   100 N - 50 N = 50 N

Now, this resultant force is in the upward direction.

In other words, the net force on the object is 50 N in the upward direction.

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At 15 °C, benzene has a density of 0.8787 g/ml. 131.8g make up 0.15 L of benzene's mass.

Density, mass of a unit volume of the material substance. The formula for density is d = M/V, where d is the density, M is mass, and V is volume. Density is commonly expressed in the units of grams per cubic centimeter. For example, the density of water is 1 gram per cubic centimeter, and the Earth’s density is 5.51 grams per cubic centimeter.

Density can also be expressed as the kilograms per cubic meter (in meter-kilogram-second or SI units). For example, the density of the air is 1.2 kilograms per cubic meter. The densities of common solids, liquids, and gases are listed in the textbooks and handbooks.

Density offers a convenient means of obtaining mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density (M = V*d), while the volume is equal to the mass divided by the density (V = M/d). The weight of a body, which is usually of more practical interest than its mass, can be obtained by multiplying mass by the acceleration due to gravity.

There is a relationship between a substance's mass (m), volume (V), and density (d) that reads as follows:

d = m / V.

d = 0.8787 g/ml.

V = 0.15 x 1000 = 150 ml.

∴ the mass of 0.15 L of the benzene = d x V = (0.8787 g/ml) (150 ml) = 131.8 g.

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A 28.0 g sample of iron‑59 to decay to 1.75 g would take 176 days if its half-life is 44 days.

From the first order kinetics, We know that

t= 2.303 × log A₀[tex]A_{t}[/tex]     ....  (1)

Here, t is the number of days it would take for the sample to decay.

K refers to the first-order rate constant,

A₀ refers to the concentration at time = 0

[tex]A_{t}[/tex] is the concentration at time t.

Given that,

Half-life of the iron-59, [tex]t_{\frac{1}{2}}[/tex] = 44 days

A₀ = 28 g

[tex]A_{t}[/tex] = 1.75 g

t =?

K =?

In order to find the rate constant use the formula

[tex]t_{\frac{1}{2}}[/tex] = 0.693/K

K = 0.693 / [tex]t_{\frac{1}{2}}[/tex]

= 0.693/44

= 0.01575 per day

Substitute all the values in (1), to get,

t = (2.303/0.01575)×log(28/1.75)

= 176.06 days

Therefore, for a 28.0 g sample of iron‑59 to decay to 1.75 g, would take 176 days.

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The substrate concentration of the enzyme operating at one‑quarter of its maximum rate is = 0.333.

Relationship between Km and substrate concentration is -

Km is the concentration of substrate.It allows the enzyme to achieve half Vmax. High Km enzyme requires a higher concentration of substrate to get Vmax. Since, Km is a constant. If the substrate concentration is increased, it has no effect on it.

An enzyme with a high Km has a low affinity for its substrate. The substrate concentration Km corresponds to the substrate concentration.

The substrate concentration at which the reaction rate of the enzyme-catalyzed reaction is half of the maximum reaction rate Vmax.

The equation is:

                V₀ = Vmax [S]

                         [S] + Km

Here,

V₀ is initial rate,

Km is the dissociation constant between the substrate and the enzyme,

Vmax is the maximum rate, and

S is the concentration of substrate.

taking fraction of V₀ and Vmax :

   V₀     =     [S]      

Vmax      [S] + Km

  V₀   =     0.5Km    = 0.333

Vmax       1.50 + Km

Therefore, the substrate concentration of this enzyme operating at one‑quarter of its maximum rate is = 0.333.

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Nitrogen atom have 7 electrons.

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NO, a size separation technique does not make sense for separation of one soluble and one insoluble salt.

To separate one soluble and insoluble salt, techniques of solvent extraction and evaporation, crystallization are used.  Among these, evaporation is the best technique to separate the salts.

Size separation techniques sieving, sifting, and screening. These are used on the basis of differences in size, shape, and density between particles.

The technique of evaporation is used. The mixture of the two soluble and insoluble salts are added to water. The soluble salt is allowed to dissolve and the insoluble salt is filtered out. The soluble salt can be obtained by evaporating with water.

This method involves four stages :

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Answer:

How much matter something has

Density is how much matter something has.

The amount per unit of length, area, or volume: as. a: a substance's mass per unit volume. the distribution of a quantity per unit, typically of space, such as mass, power, or energy.

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the formula for density in mathematics: display style rho = frac mV. where m is the mass, V is the volume, and is the density.

The ratio of an object's mass to its volume is its density.

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At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then the % salicylic acid impurity in your aspirin will be 7.8 percent.

According to the inquiry, the sample solution's absorbance (A) is 1.07. Beer's law, which states that A = ebc, is used to calculate the aspirin concentration.

Here, b is the route length, which is equal to 1 cm, and e is the extinction coefficient, which is equal to 139.322 M-1cm-1 based on the salicylic acid standard value. Having established our ideals,

A = ebc

c = A / (eb)

c = 1.07 / (139.322 × 1)

c = 0.00768 M

To establish the percentage of salicylic acid in the sample, it is now necessary to compare the value of concentration calculated with the concentration of aspirin previously administered.

The question mentions that the starting concentration of aspirin is 0.02 grammes. The molar mass of aspirin is 240 g/mol.

The aspirin molecules will therefore be,

0.02 / 240 = 8.33 × 10^-5 moles  

The final volume of the diluted solution given is 10 ml or 0.01 liters.  

The molarity of aspirin in the diluted solution will be,  

c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M

Now, the percent of salicylic acid in the product will be,  

c1 - c / c1 × 100

(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %

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The solubility of glucose is classified as a Supersaturated solution that is made by adding glucose to water at varying amounts for various compounds.

The maximum amount of the chemical that will get to dissolve in a given amount of solvent at a given temperature is referred to as the solubility of that solution. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair.

The creation of a new bond that is between the molecules of the solute and the solvent is known as the solubility. Solubility means the greatest amount of solute that can be dissolved in a known amount of solvent at a specific temperature.

The quantity of a chemical that can dissolve in water at a particular temperature is known as its water solubility. It is customary to measure solubility in mg/L (milligrams per liter) or ppm (parts per million).

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Complete Question

The solubility of glucose at 30°c is 125 g/100 g water. A solution is made by adding 250 g of glucose to 100 ml of water at 30°c. Remember that 1 g water = 1 ml water. How would you classify this type of solution?

A) heterogeneous

B) saturated

C) supersaturated

d) unsaturated.

The wavelength of blue light is 0.00000045 m. This wavelength in scientific notation is 4.5 × 10⁻⁷m.

A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places adjacent crests in the consecutive cycles.

A spectrum is the term used to describe the range of wavelengths or frequencies for wave phenomena. The term was originally used to describe the electromagnetic spectrum, but it is now used to describe the sound spectrum and vibration spectrum.

The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second and represents the number of vibrations that pass over a certain area in one second (Hz).

Thus,  This wavelength in scientific notation is 4.5 × 10⁻⁷m.

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If the independent variable is altitude of water and the dependent variable is boiling temperature. The experiment could be on how high does the water bubble and jump when boiling.

Consider strategies to adjust each variable individually once you believe you have identified those that may be at play. If you alter more than one at once, you won't be able to identify the variable that is responsible for your observation. There are instances when factors are connected and act in concert to generate an event. Try to pick variables at beginning that you believe behave independently of one another.

The altitude of water is the independent variable, sometimes referred to as the manipulated variable.

The boiling point of water is the dependent variable (sometimes referred to as the responsive variable).

Therefore, if the independent variable is altitude of water and the dependent variable is boiling temperature. The experiment could be on how high does the water bubble and jump when boiling.

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The example of Iodine and tellurium where iodine which had lesser atomic mass was placed before tellurium proved that order of the Periodic table based on atomic mass was not always correct.

The periodic table as designed by Mendeleev was arranged such that the elements were arranged in order of increasing atomic mass.

However, in this case of tellurium and iodine, Mendeleev placed tellurium before iodine even though it had a greater atomic mass than iodine. This was because Mendeleev observed that elements with similar chemical properties were occurring in a regular pattern in the periodic table and iodine has similar chemical properties to bromine and chlorine before it.

Therefore, the case of Iodine and tellurium proved that arranging elements in the periodic table in order of increasing atomic mass was not always correct.

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Answer:

literally all you have to write to get the mark is the word isotopes

Based on the successive ionization energies, the formula that would be formed when "X" reacts with chlorine, Cl is XCl.

Since it is seen that there is a large gap in energy difference in second ionization energies ( from 577 to 1820), which means that the valance electron in the given element X is 1. So, the formula will be X⁺ and Cl⁻ is  XCl.

Successive ionization strength is described because of the energy this is required to cast off the electron one after the alternative. Successive ionization power will rely on the range of electrons gift in the outermost shell.

Successive ionization energies boom in value due to the fact the variety of electrons, which purpose repulsion, progressively lower. This isn't always a smooth curve there may be a large leap in ionization power after the atom has misplaced its valence electrons.

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Molecular Solid can be described as the solid type for ice where the molecules are held together with low intermolecular force to form such kind of solids.

Van der Waals forces hold molecules together to form molecular solids. These intermolecular forces are weak, which controls its characteristics. Molecular solids are electrical insulators, soft, frequently volatile, and have low melting temperatures.

Molecular solids are composed of atoms or molecules bound together by hydrogen bonds, London dispersion forces, or dipole-dipole forces. Characterized by weak conductivity, flexibility, and low melting points. Sucrose is a type of molecular solid.

A solid made up of distinct molecules is referred to as a molecular solid. Molecular solids can be either soft or rigid.

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Complete Question

Identify the type of solid for ice.

A) Nonbonding atomic solid

B) Metallic atomic solid

C) Molecular solid

D) Ionic solid networking atomic solid

Nuclear reactors are the main components of the nuclear power plants which are used for the production of heat through the process called fission.

The nuclear reactors are divided into many types which include:

The Breeder reactors are the type of reactors that has the ability to yield more energy than it can consume which makes it economical.

The Breeder reactors are different from the regular nuclear reactors because it utilizes either uranium-238 or thorium, while regular nuclear reactors makes use of isotope uranium-235.

An advantage of Breeder reactors is that they produce more fuel that it consumes while it's disadvantage is that it's more dangerous than a regular reactor.

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Referring below mentioned assertions,

Claim 1: Jordan Jones used blood doping to accelerate his cellular respiration and boost his performance.

Claim 2: By altering his pre-race diet, Jordan Jones boosted his cellular respiration and overall performance.

Claim 3: By practicing at a greater altitude, Jordan Jones raised his cellular respiration and enhanced his performance.

Therefore, the strongest claim is that Jordan Jones trained at a greater altitude, which enhanced his cellular respiration and improved his performance.

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At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then the % salicylic acid impurity in your aspirin will be 7.8 percent.

The sample solution's absorbance (A), as specified in the question, is 1.07. Beer's law is applied to determine the aspirin concentration, which is A = ebc.

Here, e is the extinction coefficient, which, according to the standard value for salicylic acid, is equal to 139.322 M-1cm-1, and b is the path length, which is equal to 1 cm. Now that we have our values,

A = ebc

c = A / (eb)

c = 1.07 / (139.322 × 1)

c = 0.00768 M

It is now necessary to compare the value of concentration determined with the concentration of aspirin previously given in order to calculate the percent salicylic acid in the sample.

Aspirin's initial concentration, which is specified in the query, is 0.02 grammes. Aspirin has a molar mass of 240 g/mol.

Consequently, the aspirin molecules will be,

0.02 / 240 = 8.33 × 10^-5 moles  

The final volume of the diluted solution given is 10 ml or 0.01 liters.  

The molarity of aspirin in the diluted solution will be,  

c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M

Now, the percent of salicylic acid in the product will be,  

c1 - c / c1 × 100

(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %

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Answer:

HCl gas is collected by upward displacement of air because it is 1.28 times heavier than air. It is not collected in water because it is highly soluble in water.

Hope this helps you ;)

Explanation:

if a compound is pure, melting point should be close to the expected value and very narrow (1-2°c).

if a compound is impure, containing traces of starting material or byproduct, melting point is expected to be lower than the expected range and broad.

if a compound is wet with water or residual solvent, melting point is expected to be lower than the expected range and broad.

In simple terms, matter can be defined as anything and everything that has mass and occupies space. Everything from air you breathe, the water you drink, or the clothes you wear comes under the category of matter. It is made up of an elementary particle referred to as an atom. A further matter is subdivided into two the primary categories which are –

Pure and impure substances are different from one another and have the distinctive characteristics. Now, let’s look into them in the detail to get a clear understanding of Characteristics of a pure and impure substances.

When single types of atoms are combined together, it results in the formation of the pure substances. As a result, these substances possess the homogeneous chemical compositions and hold a fixed structure and chemical properties.  

Impure substances, also known as the mixtures, are another type of matter formed through different kinds of molecules or atoms. The stature of these is not fixed or constant, unlike the pure substances. They can be broken down into the pure substances with the help of purification methods such as sublimation, filtration, crystallization, and so on.

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Answer:

While alpha and beta rays have energy and mass, gamma rays are pure energy.

Water's polarity help it to dissolve so many substances  as  water's oppositely charged ends are attracted to other charged ions and polar molecules.

water's polarity allows it to form covalent bonds with many substances because of water bent shape. it gives oxygen atom partial negative charge and hydrogen atom partial negative charge .the positive part attract and pull of negative part solute and the negative part attract and pull of positive part of solute.

Hydrocarbons are non polar molecule , they do not dissolve in polar solvent like water. so, water's polarity does not increases its ability to form ionic bond with ions and hydrocarbons.

Hydrophobic means water - fearing . this means the hydrophobic substances donot dissolve in water.

Thus, Water's polarity help it to dissolve so many substances  as  water's oppositely charged ends are attracted to other charged ions and polar molecules. hydrocarbons and hydrophobic substance do not dissolved in water.

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Answer:

The term niche, when used in the science of ecological biology, is used to define an organism's role in an ecosystem. Not only does its niche include the environment that a given organism lives in, but it also includes the organism's "job" in that environment.

Answer:

a niche is an area within an ecosystem in which a particular group of organisms live in.

The pH value of the given buffer system after the addition of 0.019 mol of NaOH is 3.58.

To determine the pH of a buffer system, we use the Henderson-Hasselbalch equation:

[tex]pH = pK_{a} + log\frac{[base]}{[acid]}[/tex]

In our case, the base is sodium nitrite, while the acid is nitrous acid. Upon addition of NaOH, the added base will react with the acid, neutralizing it and turning it into sodium nitrite. We need to calculate how much acid and base we will have after the addition of NaOH:
[tex]n_{NaNO_{2} } = 1 L * 0.12 M + 0.019 mol = 0.139 mol[/tex]

[tex]n_{HNO_{2} } = 1 L * 0.10 M - 0.019 mol = 0.081 mol[/tex]

Because the volume of the solution is the same for both components, we don't need to calculate the actual concentrations and can just plug in the moles in the Henderson-Hasselbalch equation:

[tex]pH = -log(4.5 x 10^{-4}) + log\frac{0.139 mol}{0.081 mol} = 3.35 + log1.716 = 3.58[/tex]

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The pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.

We know that an ionic solution is composed of ions. The ions in a solution are capable of interacting with reagents and this is the basis for the qualitative identification of ions in a solutions.

Now let us look at the options, we are going to look out for the option in which the addition of the chloride ion would lead to the emergence of a precipitate in the solution.

If we consider the solutions properly, we would see that the pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.

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Missing parts;

Based on the solubility observations, which of the following pairs of cations could be distinguished by the addition of sodium chloride to the solutions?

Choose..

barium and lead

barium and aluminum

lead and silver

iron and calcium.