7. If you plotted atomic radius versus first ionization
energy, would the graph reveal a direct or inverse
relationship?

Answer:

32.0 g O2

Explanation:

[tex]2.00 \: mol \: mg \: x \frac{1 \: mol \: o2}{2 \: mol \: mg} x \: \frac{32.0 \: g \: o2}{1 \: mol \: o2} = 32.0 \: g \: o2[/tex]

I'm not sure if I understood your question correctly so your better off not using my answer lol

Answer:

The final volume of NaOH solution is 30ml

Explanation:

We all know that

              V1S1 = V2S2

             or V1= V2S2÷S1

             or  V1= V2×S2×1/S1

             or   V1=100×0.15×1/0.50

                    V1= 30

∴30 ml NaOH solution is required to prepare 0.15 M from 100ml 0.50 M NaOH solution.

The final volume of the NaOH solution, with the desired concentration of 0.150 M, can be calculated using the concept of molarity. Plugging the initial molarity, volume, and final molarity into the formula M1V1 = M2V2 gives a final volume of approximately 333.3 mL.

To calculate the final volume of the NaOH solution, we will use the concept of molarity, which is represented by the equation M1V1 = M2V2 where M1 and V1 are the initial molarity and volume, and M2 and V2 are the final molarity and volume. In the given problem, the initial molarity (M1) is 0.500 M, the initial volume (V1) is 100 mL, and the desired final molarity (M2) is 0.150 M.

Accordingly, we rearrange the equation to solve for V2: V2 = (M1V1) / M2. Substituting the given values, we find V2 = (0.500 M × 100 mL) / 0.150 M = 333.3 mL.

So, you would need to dilute the initial 100 mL of 0.500 M NaOH solution to a final volume of approximately 333.3 mL to achieve a final concentration of 0.150 M.

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Answer:

E) rate of appearance of C = 0.45 M/s

rate of the reaction = 0.15 M/s

Explanation:

2A + B → 3C

Writing rate law for the reaction:

Rate of reaction = -[tex]\frac{1}{2}[/tex][tex]\frac{d[A]}{dt}[/tex] = -[tex]\frac{d[B]}{dt}[/tex] = [tex]\frac{1}{3}[/tex][tex]\frac{d[C]}{dt}[/tex] → equation 1

Given that the rate of disappearance of A is 0.3 M/s

⇒ - [tex]\frac{d[A]}{dt}[/tex] = 0.3 M/s

⇒Rate of reaction = - [tex]\frac{1}{2}[/tex][tex]\frac{d[A]}{dt}[/tex] = [tex]\frac{1}{2}[/tex]×0.3 M/s

⇒Rate of reaction = 0.15 M/s

From equation 1, [tex]\frac{d[C]}{dt}[/tex] = - [tex]\frac{3}{2}[/tex][tex]\frac{d[A]}{dt}[/tex] = [tex]\frac{3}{2}[/tex]×0.3 M/s

⇒[tex]\frac{d[C]}{dt}[/tex] = 0.45 M/s

or the rate of appearance of C = 0.45 M/s

Final answer:

To find the mass of neon, we can use the ideal gas law and calculate the number of moles of neon first.

Explanation:

To solve this problem, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

P: Pressure = 720 mmHg

T: Temperature = -15.0 °C (convert to Kelvin: 258.15 K)

V: Volume = 760 mL (convert to m³: 760 * 10⁻³ m³)

n: Number of moles of neon (unknown)

m: Mass of neon (unknown)

R: Ideal gas constant = 8.314 J/mol·K

2. Apply the ideal gas law:

The ideal gas law relates pressure, volume, temperature, and the number of moles of a gas:

PV = nRT

3. Rearrange the equation to solve for n:

n = PV / RT

4. Substitute the known values and calculate n:

n = (720 * 133.3224 Pa) * (760 * 10⁻³ m³) / (8.314 J/mol·K * 258.15 K)

Convert mmHg to Pa using the conversion factor 1 mmHg = 133.3224 Pa.

n ≈ 0.0340 mol

5. Calculate the mass of neon:

m = n * M

where M is the molar mass of neon (20.18 g/mol).

m = 0.0340 mol * 20.18 g/mol

m ≈ 0.686 g

Therefore, the mass of neon in the container is approximately 0.686 grams.

Answer:

Option A)  C, E and F

Explanation:

It is very clear from the graph, that females will outnumber males in the particular age category where the orange occupies a greater number.

Therefore through observation, we can see that the orange color which denotes females is greater than blue color which denotes males in the following age categories-

Category C- 20-24.9 years of age,

Category E- 35-49.9 years of age   and

Category F- >50 years of age.

Hence, C, E and F only.

Answer:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Answer: 0.537 moles

Explanation:

Hello, Let's first explain the term molarity

---> Molarity is the most commonly used term to describe the concentration of a solution. It is equal to the moles of solute divided by the liters of solution.

---> The solute is defined as the substance being dissolved, while the solvent is the substance where the solute is dissolved (usually water).

---> The solution is the combination of the solute and the solvent.

Molarity = moles of solution/Liters of

solution

Parameters given are

Volume(V) = 179ml of CaCl2 solution

Molarity = 3.0m

Therefore,

Molarity = number of moles of CaCl2 solution / Volume of CaCl2 in Liters (eqn 1)

First, convert 179ml to liters

1ml = 0.001L

179ml = ?

179ml = 179ml x 0.001L

= 0.179L

From (eqn 1)

Let the number of moles of CaCl2 solution be M

=> 3 = M/0.179

M = 0.179 x 3

= 0.537 moles

Hence the number of moles in 179ml of CaCl2 solution yields 0.537 moles

Pb₃O₄ + 4HNO₃ → 2Pb(NO₃)₂ + PbO₂ + 2H₂O​

Thus, the balanced equation will be;

Pb₃O₄ + 4HNO₃ → 2Pb(NO₃)₂ + PbO₂ + 2H₂O​\

Thus, the equation obeys the law of conservation of mass.

Answer:

Blue color of iodine-starch complex is disappear upon hysrolysis

Explanation:

Starch:

Starch is a polysaccharide

it is energy reservoir.

starch is made of monomers of glucose in a chain form.

The simplest form of starch is linear polymer amylose.

Iodine Test:

In this test iodine solution added to the solution to check the presence of starch.  

Iodine solution = elemental iodine + KI

Result of Iodine Test:

when the iodine solution (I₃⁻) is added to a solution it show two types of result.

if the starch is present this I₃⁻ form a complex with amylose chain of starch and impart a dark blue color.

if starch is not present then the color will be orange or yellow.

Hydrolysis of Starch:

Hydrolysis of starch is carried out by an enzyme, this enzyme break down the starch into simpler sugar molecule.

So,

When the hydrolysis of starch occur the starch convert to glucose. Then the blue color of starch and iodine complex formed during iodine test is disappear that will be the indication of hydrolysis of starch.

Answer: No, you need to repeat an experiment multiple times before accepting a conclusion.

Answer: A. No, you need to repeat the experiment multiple times before accepting a conclusion.

Answer:

The answer is: [tex]7.7\times10^{10}[/tex]

Explanation:

Scientific notation is of the kind: [tex]a.bc\times10^{x}[/tex]

The given calculation:

[tex]7.0\times10^{3}\times1.1\times10^{7}=(7\times1.1)\times10^{(3+7)}[/tex]

[tex]=7.7\times10^{10}[/tex]

Therefore, the answer in scientific notation is: [tex]7.7\times10^{10}[/tex]

Final answer:

In a solution of aqueous calcium chloride, there are two Cl- ions for every Ca2+ ion.

Explanation:

The proper ionic formula for aqueous calcium chloride is CaCl2. This means that in a solution of aqueous calcium chloride, there are two Cl- ions for every Ca2+ ion.

In a solution of aqueous calcium chloride (CaCl₂), the ions present are (a) Ca²⁺ and Cl⁻ in a 1:2 ratio.

A solution of aqueous calcium chloride (CaCl₂) dissociates into its constituent ions in water. The dissolution equation is as follows:

CaCl₂(s) → Ca²⁺(aq) + 2Cl⁻(aq)

This means that for every 1 molecule of CaCl₂ that dissolves, it produces 1 calcium ion (Ca²⁺) and 2 chloride ions (Cl⁻). Therefore, the ions are present in a 1:2 ratio in the solution.

Complete Question - 2. What ions are present in what ratio in a solution of aqueous calcium chloride?

a. Ca²⁺(aq) and Cl⁻(aq)

b. Ca²⁺ (aq) + Cl₂ (aq)

There are 5 possible structural isomers with the molecular formula C₇H₉N.

Explanation:

You may find the chemical diagrams of the structural isomers in the attached picture.

Learn more about:

structural isomers

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Answer:

Molarity = 0.458M

Explanation:

Molarity is the representation of the solution.

Molarity:  

it is amount of solute in moles per litre of solution and represented by M

Formula used for Molarity

                      M = moles of solute / Litre of solution

Data Given:

NaCl = 9.3 g

volume of solution = 350 mL

volume of solution in litre = 350/1000

volume of solution = 0.35 L

Molarity = ?

Formula used to Calculate M

                      M = moles of NaCl / Litre of solution . . . . . . . . .  (1)

So

we have to first calculate moles of NaCl

                 Moles of NaCl = mass of NaCl/ Molar Mass (NaCl) . . . . . . .  (2)

*Molar Mass of NaCl = 58 g/mol

Put values in Eq (2)

                  Moles of NaCl = 9.3 g/ 58 g/mol

                  Moles of NaCl = 0.16 mol

Now

Put values in Eq (1)

                       M =  0.16 mol / 0.35 L

                       M = 0.458

So the Molarity = 0.458M

Taking into account the definition of molarity, the concentration (M) of the NaCl solution is 0.45 [tex]\frac{moles}{liter}[/tex].

It is necessary to know that molarity reflects the concentration of a solution, indicating the number of moles of solute that appear dissolved in a given volume. In other words, molarity is the amount of a substance in a certain volume of solution.

Molarity is also known as the molar concentration of a solution.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

[tex]molarity=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, molar mass is the mass of one mole of a substance. Then, the molar mass of NaCl being 58.45 [tex]\frac{g}{mole}[/tex], the number of moles representing 9.3 g of NaCl is calculated as:

[tex]amount of moles=\frac{9.3 g}{58.45 \frac{g}{mole}}[/tex]

amount of moles= 0.159 moles

On the other side, the volume of the solution is 350 mL= 0.350 L (being 1000 mL=1 L)

Replacing in the definition of molarity:

[tex]molarity=\frac{0.159 moles}{0.350 L}[/tex]

Solving:

molarity= 0.45 [tex]\frac{moles}{liter}[/tex]

Finally, the concentration (M) of the NaCl solution is 0.45 [tex]\frac{moles}{liter}[/tex].

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The measurement of 120.090 m/s recorded by the radar gun contains six significant digits, with all digits being significant.

In physics, understanding the concept of significant figures is essential for accurately reporting the measurements we make. The speed of a projectile recorded by a radar gun as 120.090 m/s contains six significant digits. This is because all non-zero numbers are always significant, any zeros between non-zero numbers are significant, and any trailing zeros to the right of the decimal point are also significant. Therefore, each digit in the measurement, 1, 2, 0, 0, 9 and 0, are all significant, giving us a total of six significant figures in the speed of the projectile.

The number of significant digits in a measurement is determined by the certainty of the measuring device.

In the given speed measurement of 120.090 m/s, there are five significant digits because each non-zero digit is significant, the trailing zero after the decimal point counts, and any zero between significant digits is also counted.

In this case, the significant digits are 120.090.

The expected parameters in Stratopause are; Temperature: -15 degrees Celsius, Pressure: 1 milibar and Water vapor concentration: cannot be determined.

Explanation:

"Stratopause" is the interaction between the ionosphere and the stratosphere. It is 50-55 km high above the earth surface that is why temperature is very less approximately -15 degrees Celsius (5 degrees Fahrenheit). As it is a thin layer separating the stratosphere and ionosphere actual water vapor concentration cannot be determined. The atmospheric pressure is around 1/1000 of the pressure at sea level.

Final answer:

The stratopause, located at about 50 km above Earth, has a constant temperature close to 0°C, low pressure, and very low water vapor concentration due to the absence of conditions that support water in other phases.

Explanation:

In the stratopause, which is the boundary layer between the stratosphere and the mesosphere located approximately 50 kilometers above the Earth's surface, one could expect to see a fairly constant temperature sufficing approximately at 0°C or 273.16 K. The temperature increases slightly in the stratosphere because it is heated from below by the absorption of ultraviolet radiation by ozone.

The pressure and density are much lower than at the Earth's surface due to the height in the atmosphere, and because the temperature is constant, pressure and density decrease together as altitude increases. In the stratosphere, there is almost no water vapor, much less than in the troposphere, so the concentration of water vapor in the stratopause would be very low. This is because the atmosphere's temperature at this layer does not support the presence of much water vapor, which would predominantly be in gaseous form if present.

D

Because the moles of the gases are the same,and the volume too, the gas with the highest temperature will exert the highest outward pressure to its environment. It, therefore, will require an equivalent pressure exerted on the gas to maintain its volume.

Explanation:

According to ideal gas laws, pressure, volume, and temperatures of gases are related in a formula;

PV/T = C

Whereby

P = Pressure

V = Volume

T= Temperatures

C = Constant

To understand how much pressure a gas exerts with change in temperature, while volume remains the same, we can evaluate the formulae in this way;

P = T/V

Therefore an increase in temperature, while volume is the same, means the Pressure will rise.

Learn More:

For more on Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's laws on gases check out;

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Answer:

its right

Explanation:

The atom with the given electron configuration, assuming the typo is corrected, has 5 valence electrons, which are the electrons from the 4s and 3d sublevels.

Valence electrons are the electrons in the outermost energy level of an atom and are involved in chemical bonding. According to the given electron configuration 1s22s22p63s23p4s23d3, we need to identify the outermost electrons. The configuration actually seems to contain an error as '3p4s23d3' is not a standard notation, but assuming the correct sequence and based on the highest principal quantum number, the valence electrons would be from the 4s sublevel (2 electrons) and the 3d sublevel (3 electrons), adding up to 5 valence electrons.

Answer:Well There is many ways to increase friction between objects. One being rubbing the two objects together quicker and harder. If there is any sort of wetness or anything related to that make sure to dry the surface between the two objects you want to create friction between so it will be more effective.

Explanation:

Answer:

It is a way for water, minerals, and sugars to move between the roots and leaves. Roots, stems, and leaves have two types of vascular tissues: Xylem: brings water and minerals from the roots to the stem and leaves. Phloem: brings sugar that is made in the leaves down to the rest of the plant.

Answer:

5.87%

Explanation:

Mass fraction of a solution is the ratio of mass of the solute to the total mass of the solution (Note that it is the total mass of the solution, i.e the sum of masses of solvent and solute). Mass percent is mass fraction times 100.

Here, the solute is KF and its mass is 59.1g. The solvent as usual is [tex]H_{2}O[/tex] and its mass is 947g. Therefore, the total mass of the solution (solution is the mixture of solvent and solute, here KF and [tex]H_{2}O[/tex]) is 59.1 + 947 = 1006.1g.

The mass fraction is the ratio of mass of KF to the total mass of solution = [tex]\frac{59.1}{1006.1} = 0.0587[/tex].

Thus, the mass percent is mass fraction × 100 = 0.0587 × 100 = 5.87 %

Answer:

T = 271.23 degree celcius

Explanation:

For the gas inside the tyre

PV = nRT

So, P is directly proportional to T.

[tex]\frac{P_{1} }{P_{2} }[/tex] = [tex]\frac{T_{1} }{T_{2} }[/tex]

[tex]\frac{2.6}{5}[/tex] = [tex]\frac{283}{T}[/tex]

T = 544.23 K = 271.23 degree celcius

So, Tyre have to get the temperature 271.23 degree celcius for this to happen.

Answer:

[H⁺] = 2.0 × 10⁻¹² M

Explanation:

Given data:

Concentration of KOH = 0.005M

H⁺ = ?

Solution:

pOH = -log[ OH⁻]

pOH = -log[0.005]

pOH = 2.3

pH + pOH = 14

14 -  pOH  = pH

pH = 14 - 2.3

pH = 11.7

pH = -log[H⁺]

11.7 = -log[H⁺]

[H⁺] = Antilog (-11.7)

[H⁺] = 2.0 × 10⁻¹² M

Answer:

If a chain reaction takes place, the amount of energy released would increase exponentially, so in order to control the energy release, fission must be controlled without controlling a chain reaction, so the third option is correct.

Hope this helps!

Explanation:

Answer:

D

Explanation:

Answer:

A. More molecules have enough energy to overcome the attractive forces holding them in the liquid.

Explanation:

Answer:

2,4-dinitrophenylhydrazine (Brady’s reagent)

Explanation:

Answer:

Option B

Explanation:

The hypothesis needs to produce results that can prove it to be true or false.

A testable hypothesis in science can be experimented or observed to determine its truth or falsehood.

A testable hypothesis in science means that it can be tested through experimentation or observation to determine if it is true or false. This is an essential aspect of the scientific method, which aims to gather empirical evidence to support or reject hypotheses. In order for a hypothesis to be testable, it must be formulated in a way that allows for the collection of evidence that can support or refute it.

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Answer:

The answers are:

1) Latent heat of fusion

2) Heat is released

3) The process is endothermic

Explanation:

(1) The amount of energy required to freeze one kg of a substance is called latent heat of fusion.

(2) In a process, if heat is absorbed, the change in enthalpy for the substance is positive.

In a process, if heat is released, the change in enthalpy for the substance is negative.

The enthalpy of freezing for water is -6.02 kJ/mol. Heat is released as the enthalpy is negative.

(3) A positive value for enthalpy of vaporization indicates that the process is endothermic.

An exothermic process is one in which energy is released. The enthalpy for the process is negative.

An endothermic process is one which energy is absorbed. The enthalpy for the process is positive.

The wave mechanical model of the atom represents electrons as waveforms existing within regions (electrons clouds or orbitals) where they have a probability of being found, rather than precise orbits. It also explains electron energy levels and how electrons change energy states.

The wave mechanical model of the atom, also known as the quantum mechanical model, is primarily required to explain the behavior of electrons within an atom. Unlike the more simplistic Bohr model, which treats electrons as particles moving in precise orbits, the wave mechanical model treats electrons as waveforms.

This model more accurately reflects how electrons do not have precise locations within an atom, but rather exist within areas called electron clouds or orbitals, where they have a higher probability of being found. These orbitals are the regions in an atom where electrons are likely to be found and can be visualized as fuzzy clouds surrounding the nucleus.

For instance, in the base state, electrons reside in the lowest possible energy level, or ground state. If energy is provided to the atom, such as through heat or light, electrons can move to a higher energy level, known as an excited state. When the electron returns to the ground state, it releases energy, often as light.

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The wave mechanical model of the atom allows for the probabilistic description of atomic structure, particularly the behavior of electrons. This model explains that electrons exhibit wave-particle duality and exist in an electron cloud around the nucleus. It is essential to understand chemical bonding, electron configuration, and atomic spectra.

The wave mechanical model, or quantum model, of the atom, is fundamental in explaining the behaviors and characteristics of atoms, particularly the behavior of electrons. This model grew from the work of de Broglie and Heisenberg. De Broglie proposed that particles such as electrons can also have properties of waves - an idea known as wave-particle duality.

Building on this, Heisenberg introduced the uncertainty principle, asserting that it's impossible to precisely determine both the position and momentum of a particle at the same time. This led to the concept of an electron cloud, which is a probabilistic model of where an electron is likely to be at any given time. Schrödinger further expanded this with his wave equation, which could calculate the probable locations of electrons, these calculations are termed wavefunctions or orbitals.

Therefore, the quantum mechanical model illustrates the atom not as a mini solar system with well-defined orbits, but in terms of probability distributions with various shapes and orientations around the nucleus where the electron could be found. This model is required to describe atomic properties such as electron configuration, atomic spectra, and chemical bonding.

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