Determine the average atomic mass for the following mixture of isotopes:

Fe – 55 = 15%, Fe – 56 = 85%

TDensity of a proton is approximately 4.06 x 10^14 g/cm^3.

To determine the density of a proton, we need to use the formula:

Density = Mass / Volume

We know the mass of the proton, which is 1.7 x 10^-24 g. To find the volume of the proton, we can use the formula for the volume of a sphere:

V = (4/3) x pi x r^3

where r is the radius of the proton, which is 1.0 x 10^-13 cm.

Plugging in the values, we get:

V = (4/3) x pi x (1.0 x 10^-13)^3 = 4.19 x 10^-39 cm^3

Now we can calculate the density:

Density = Mass / Volume = 1.7 x 10^-24 g / 4.19 x 10^-39 cm^3

Simplifying this expression, we get:

Density = 4.06 x 10^14 g/cm^3

Therefore, the density of a proton is approximately 4.06 x 10^14 g/cm^3.

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Answer:

The answer for 10 times 20 is 200

Explanation:

Why... Because what is 1 times 2=2 so add the left over zero I'm that your answer!

Answer:

A = 74 g

Explanation:

Given data:

Ma-74 (74.333 - 85%)

Ma-75 (74.999 - 10%)

Ma-76 (75.700 - 5%)

Atomic mass close to = ?

Solution:

1st of all we will calculate the average atomic mass.

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass  = (85×74.333)+(10×74.999)+(5×75.700) /100

Average atomic mass =  6318.305 +749.99+ 378.5 / 100

Average atomic mass= 7446.795/ 100

Average atomic mass = 74.467 amu

The average atomic mass is closer to the 74 g.

When sodium thiosulfate (Na₂S₂O₃) is introduced to a solution containing silver bromide (AgBr), the silver ions (Ag⁺) in the solution react with the thiosulfate ions (S₂O₃²⁻) from the sodium thiosulfate, resulting in the formation of complex ions. These complex ions consist of a metal ion, which in this case is Ag⁺, and one or more ligands, in this case, the thiosulfate ions.

This reaction occurs because the thiosulfate ions have a high affinity for the silver ions due to their ability to coordinate with the metal ion, forming a stable complex. Once the complex ion is formed, it remains in solution and does not precipitate out as a solid.

Therefore, all the silver ions in solution will form complex ions when sodium thiosulfate is added to a solution of silver bromide, leading to the formation of a clear colorless solution. This reaction is often used in photography to fix the image by removing the unexposed silver bromide from the photographic film.

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Answer:

Solid turns to liquid and liquid to gas

Explanation:

ice cube to water, water to carbon

Geometry is a branch of mathematics that deals with shapes, sizes, and spatial relationships. It is used to measure, analyze, and describe the properties of figures and objects.

Geometric shapes such as circles, squares, and triangles provide the basis for understanding measurements such as angles, perimeters, and areas. Geometry is also used to calculate volume and surface area. Geometry is often used in engineering, architecture, and design.

For example, architects often use geometry to create plans for buildings. Engineers use geometry to design machines and structures. Geometric principles can also be used to solve problems in other areas such as physics, chemistry, and biology.

Geometry is also important for navigation, as the principles of geometry are used to determine the shortest distance between two points. Geometry is a fundamental part of mathematics and is used to understand the world around us.

By understanding geometric principles, we can better understand our environment and the relationships between objects in it.

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Answer: The four ions formed are \(H^+\) , \(OH^-\) , \(Na^+\) and \(Cl^-\)

Explanation:

Electrolysis is the process where electricity is used to drive chemical reactions.

In the electrolysis of aqueous solution of sodium chloride, hydrogen gas produces at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode and the sodium hydroxide remains dissolved in the solution.

The reactions will be :

\(NaCl\rightarrow Na^++Cl^-\)

\(H_2O\rightarrow H^++OH^-\)

Hence, electrolysis of an aqueous solution of sodium chloride lead to the formation of four ions,\(H^+\) , \(OH^-\) , \(Na^+\) and \(Cl^-\)

At room temperature 15 grams of zinc will occupy 2.10 cm3

What is density of an element?

When atoms occupy a specific volume of space, their mass and number are measured by the periodic table's element densities. The quantity of mass in a particular volume, commonly expressed as grams per cm3 or g/cm3, is the density, which is a measurement of the number of particles in a certain volume of a substance.

Given the mass of zinc is 15 grams.

The density of zinc in room temperature is 7.14 g/cm^3

Density = mass/ volume

Volume =  mass / density

Volume = 15/ 7.14 = 2.10 cm3

Hence, at room temperature 15 grams of zinc will occupy 2.10 cm3.

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On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.

If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).

Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)

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Answer:

70..... I think

Explanation:

Cuz if the bus travels 35 km every 30 mins this means that it travels 70 km per hour

Explanation:

Making a salt from an alkali

If you are using an alkali - which is a soluble base - then you need to add just enough acid to make a neutral solution (check a small sample with universal indicator paper).

Warm the salt solution to evaporate the water. You get larger crystals if you evaporate the water slowly.

This net ionic equation, including phases, represents the reaction of Fe(NO₃)₂(aq) and Na₂CO₃(aq) to form FeCO₃(s) and 2NaNO₃(aq).

The net ionic equation, including phases, for the reaction:
Fe(NO₃)₂(aq) + Na₂CO₃(aq) ⇒ FeCO₃(s) + 2NaNO₃(aq)
First, we break down the reactants and products into their respective ions:
Fe²⁺(aq) + 2NO₃⁻(aq) + 2Na⁺(aq) + CO₃²⁻(aq) ⇒ FeCO₃(s) + 2Na⁺(aq) + 2NO₃⁻(aq)
Now, we can remove the spectator ions that do not participate in the reaction, which are 2Na⁺(aq) and 2NO₃⁻(aq). This gives us the net ionic equation:
Fe²⁺(aq) + CO₃²⁻(aq) ⇒ FeCO₃(s)

The entire symbols of the reactants and products, as well as the states of matter under the conditions under which the reaction is occurring, are written in the complete equation of a chemical reaction.

Only those chemical species that actively contribute to a chemical reaction are listed in the net ionic equation for that reaction. In the net ion equation, mass and charge must be equal.

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Yes,  the Bohr Model below follow the octet rule.

The octet rule which states that, with the exception of the innermost shell, atoms are more stable energetically when they have eight electrons in their valence shell, the outermost electron shell. And this is in line with Bohr model in which few rules are applied that will help us draw accurate diagrams.

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Answer:

They did not repeat their tests multiple times.

Explanation:

It may seem that the question is incomplete. The complete question is as below: Dominic and Eva are using the same type of stopwatches to measure the time it takes for a chemical reaction to occur. They each use the same stopwatch to measure the time. These are their results:

Dominic: 78 seconds

Eva: 81 seconds

Why are their results unreliable and can lead to a pseudoscientific claim?

They did not repeat their tests multiple times.

They used the same type of stopwatch.

They did not change the reactants in their chemical reactions.

Only one person should have collected the data.

Dominic and Eva's results are unreliable and can lead to a pseudoscientific claim because they did not repeat their tests multiple times.

Repeating the test multiple times and finding the average of the measurement will minimize the chance of having error in the measurement and improve the accuracy of the outcome.

Thus, without repeated measurement, the reliability and the validity of the measurement would be in doubt.

The  70.79  times larger is the rate constant, k , for the reaction at 2225 k than at 298 k.

The constant that determines the relationship between the molar concentration of  reactants and the speed of a chemical reaction is called the rate constant.  The rate constant is the symbol k rate constant unit. rate constant depends on temperature.

The rate constant or specific rate constant is a proportionality constant in an equation that expresses the relationship between the speed of a chemical reaction and the concentrations of the reactants.

Therefore, As for 2 condition k2,k1 are rate constant at temperature T2 and T1 respectively. where k2>k1, T2>T1.

so, log \(\frac{k2}{k1} = \frac{Ea}{2.303R} \frac{1}{T1} -\frac{1}{T2}\)

     log \(\frac{k2}{k1} = \frac{12191.5}{2.303\times 8.314} \frac{1}{298.15} -\frac{1}{2225}\)

                = \(\frac{636.96\times 1926.85}{663383.75}\)

               = 1.85

taking antilog on both side , we get

          \(\frac{k2}{k1}\) = 70.79

        k2 = 70.79 k1

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Answer:

Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions.

Explanation:

Answer:

Explanation:

At a constant temperature, the pressure of gas will increase proportional to the decrease in volume of the gas.

P1V1= P2V2

Decrease in volume result in increase in pressure as the equation has to hold true.

Answer:

The particles need energy to overcome the attractions between them. As the liquid gets warmer more particles have sufficient energy to escape from the liquid. Eventually even particles in the middle of the liquid form bubbles of gas in the liquid.

The negative sign indicates that energy is being released by the brass, as expected. Therefore, the amount of energy released by the brass when it was placed in the water is 2695.5 J.

Heat is a form of energy that is transferred between two substances or systems that are at different temperatures. Heat always flows from hotter to cooler objects or systems until they reach the same temperature, at which point the heat transfer stops. Heat can be transferred by three main mechanisms: conduction, convection, and radiation. It is a form of energy that can be measured in units of joules or calories. Heat plays an important role in many physical and chemical processes, including changes in states of matter, chemical reactions, and many forms of energy production.

Here,

To calculate the amount of energy released by the brass, we can use the equation:

Q = mCΔT where Q is the amount of energy released, m is the mass of the brass, C is its specific heat capacity, and ΔT is the change in temperature.

First, we need to calculate the change in temperature of the brass:

ΔT = final temperature - initial temperature

ΔT = 42.0 °C - 325 °C

ΔT = -283.0 °C

Note that the change in temperature is negative because the brass is losing heat.

Next, we can plug in the values we know:

Q = (25.0 g)(0.380 J/g·°C)(-283.0 °C)

Q = -2695.5 J

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When a vanadium sample's measured density at room temperature is 6.9 g/cm3, we can infer that there is a 13% inaccuracy in the measurement when compared to the true value of the density (6.1 g/cm3)

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When a vanadium sample's measured density at room temperature is 6.9 g/cm3, we can infer that there is a 13% error in the measurement when compared to the true value of 6.1 g/cm3 (Option C).

Vanadium is found to have a density of 6.9 g/cm3 at room temperature in a laboratory experiment.

Vanadium has a 6.1 g/cm3 density at room temperature, per the literature. The actual value is this.

The following expression can be used to calculate the measurement's percent error.

ε = \(\frac{experimental value - true value }{true value}\)  x 100

Thus when a vanadium sample's measured density at room temperature is 6.9 g/cm3, we can infer that there is a 13% error in the measurement when compared to the true value of 6.1 g/cm3 (Option C).

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Answer:

It's most likely gonna be C.

Explanation:

because ionic compounds can conduct electricity in aqueous solutions and covalent-which are the rest of the answers-don't conduct electricity at all.

Baking a loaf of bread and cooking an egg are only physical changes. Therefore, the correct option is option A.

A physical change gets a sort of change whereby the composition of matter is changed but not transformed. Although matter's size or shape may change, no chemical reaction takes place. Usually, physical changes are reversible. It should be noted that reversibility is not necessarily a need for a process to qualify as a physical change. Baking a loaf of bread and cooking an egg are only physical changes.

Therefore, the correct option is option A.

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Answer:4.48483134×10 to the power of 19 m to the power of 2/s

Explanation:

You should work it out some and see

Answer:

4.48483134 × 1019 m2 / s

Explanation:

Elements of the Special Theory

The speed of light is measured to have the same value of c = 3x108 m/s no matter who measures it.

The correct trend for the first pair is CS₂ > CO₂ due to stronger London dispersion forces. The correct trend for the second pair is O₂ > H₂ because of more electrons and stronger London dispersion forces.

Here's the boiling point trend for each pair of molecules:
i.) bp of CS₂ > bp of CO₂
CS₂ (carbon disulfide) has a boiling point of 46.3°C, while CO₂ (carbon dioxide) has a boiling point of -78.5°C. The reason for this difference is that CS₂ has stronger London dispersion forces due to its larger molecular size and higher number of electrons compared to CO₂. CO₂ has weaker interactions because it is a linear molecule with polar bonds, but the molecule itself is nonpolar, resulting in weaker attractive forces between molecules.
ii.) bp of O₂ > bp of H₂
O₂ (oxygen) has a boiling point of -183°C, and H₂ (hydrogen) has a boiling point of -252.87°C. O₂ has a higher boiling point because it has more electrons, which results in stronger London dispersion forces compared to H₂. The small size and low electron count of H₂ lead to weaker London dispersion forces and a lower boiling point.
iii.) bp of SiH₄ > bp of SnH₄
SiH₄ (silane) has a boiling point of -111.8°C, while SnH₄ (stannane) has a boiling point of -52°C. In this case, the trend is incorrect, as SnH₄ has a higher boiling point than SiH₄. The higher boiling point of SnH₄ is due to its larger molecular size and higher number of electrons, leading to stronger London dispersion forces between its molecules compared to SiH₄.
In summary:
- The correct trend for the first pair is CS₂ > CO₂ due to stronger London dispersion forces.
- The correct trend for the second pair is O₂ > H₂ because of more electrons and stronger London dispersion forces.
- The trend for the third pair is incorrect, and the correct trend is SnH₄ > SiH₄ due to larger molecular size and stronger London dispersion forces.

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Anything that includes water as a solvent is called an aqueous solution.

In ionic compounds, the particles are most strongly attracted to one another due to the presence electrostatic forces of attraction between oppositely charged ions.

Ionic compound or electrovalent compound is a type of compound which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond and the compound is called as ionic compounds.

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The key differences between pneumatic and hydraulic systems are:

The fluid used: Pneumatic systems use air as the fluid, while hydraulic systems use a liquid such as oil.

The transmission of power: In pneumatic systems, power is transmitted through the movement of air, while in hydraulic systems, power is transmitted through the movement of a pressurized liquid.

The types of forces involved: Pneumatic systems typically involve forces that are relatively low in magnitude but high in speed, while hydraulic systems involve forces that are high in magnitude but low in speed.

Pascal's Law states that the pressure applied to a confined fluid is transmitted undiminished in all directions and acts with equal force on equal areas. An example of a household item that applies Pascal's Law is a hydraulic jack, which uses a confined fluid (usually oil) to transmit pressure and lift heavy objects. When the handle of the jack is pressed down, the pressure of the fluid is increased and transmitted through the system, causing the lift arm to rise.

Advantages of pneumatic systems:

They are relatively simple and easy to maintain.

They are energy efficient, as air is a readily available and inexpensive fluid.

They are safe to use, as there is no risk of explosions or fires.

Disadvantages of pneumatic systems:

They are limited in their power transmission capabilities, as the forces generated by pneumatic systems are typically lower than those generated by hydraulic systems.

They are not suitable for use in high-pressure or high-temperature applications.

They are prone to leakage, as air can escape through small openings.

Examples of pneumatic systems:

Air compressors

Pneumatic tools such as hammers and drills

Automatic doors in buildings

Advantages of hydraulic systems:

They can transmit large amounts of power with relatively small amounts of force.

They are able to generate high pressures, making them suitable for use in a wide range of applications.

They are relatively simple and easy to maintain.

Disadvantages of hydraulic systems:

They require a separate power source to operate, such as an electric motor or gasoline engine.

They can be expensive to repair if they fail or leak.

They can be hazardous to use, as the fluid used (usually oil) is flammable and can cause burns or fires.

Examples of hydraulic systems:

Hydraulic lifts in automotive garages

Hydraulic jacks and presses

Hydraulic brakes in vehicles

Excavators and bulldozers

A buffer solution is defined as a solution that resists a change in pH when a small amount of acid or base is added to it. the buffer capacity of the solution will prevent the pH from changing too much.

The buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will experience the following changes when a small amount of HClO4 is added to it: The HClO4 added to the buffer solution will react with the potassium nitrite, KNO2, to form the salt, KClO4.T

he HNO2 will be converted to nitric acid, HNO3, by the HClO4.The HNO3 formed in the previous step will react with the potassium nitrite, KNO2, to form nitric oxide, NO, and potassium nitrate, KNO3.The net effect of adding HClO4 to the buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will be to shift the buffer solution to a more acidic pH range.

However, the buffer capacity of the solution will prevent the pH from changing too much.

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The places where the edges of the earth plates meet is called ;

The earth plates are made up of the earth's crust and the upper part of the Earth's mantle which are generally referred to as the Earth's lithosphere.

The Tectonic plates can be convergent, divergent or simply slide pass each other. The fault line is a crack on the earth crust due to movement of the plates, therefore at this point the edges of the earth plates meets each other due to the relative movement of the plates.

Hence we can conclude that the places where the edges of the earth plates meet are called fault lines of the earth.

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