How does an atom develop a positive charge

Answer:

There is negligible force of attraction between them.

Explanation:

According to kinetic molecular theory of gases:

a) They have high kinetic energy so the molecules show random motion.

b) The space between them increases with increase in temperature. With increase in temperature, the kinetic energy increases and the molecules move farther from each other, volume increases.

c) the average kinetic energy increases with increase in temperature

Thus only true statement is:

There is negligible force of attraction between them.

Based on the kinetic molecular theory, there is a negligible force of attraction between the particles in the sample of gas.

The correct statement is option B.

Kinetic molecular theory state that the particles of gas are large spherical and are in constant motion and have a perfectly elastic collision.

This theory can explain both Boyle's law and Charles's law.

Thus, the correct option is B, There is a negligible force of attraction between them.

Learn more about kinetic molecular theory, here:

https://brainly.com/question/8369832

whenn you have sublimation

Answer: The density of the object will be 4 g/ml.

Explanation:

Density is defined as the mass contained per unit volume.

[tex]Density=\frac{mass}{Volume}[/tex]

Given : Mass of object = 20.0 grams

Volume of object= [tex]5ml[/tex]

Putting in the values we get:

[tex]Density=\frac{20.0g}{5ml}=4g/ml[/tex]

Thus density of the object will be 4 g/ml.

Answer:

1.50 L.

Explanation:

PV = nRT,

Where, P is the pressure if the gas,

V is the volume if the gas container,

n is the no. of gas moles,

R is the general gas constant,

T is the temperature of the gas.

n₁V₂ = n₂V₁.

V₁ = 1.0 L, V₂ = ??? L.

n₁ = mass/molar mass = (2.05 g)/(32.0 g/mol) = 0.064 mol.

n₂ = n₁ + (1.00 g)/(32.0 g/mol) = 0.0953 mol.

∴ V₂ = n₂V₁/n₁ = (0.0953 mol)(1.0 L)/(0.064 mol) = 1.489 L ≅ 1.50 L.

Answer:

D.

Explanation:

The heat of evaporation, is the amount of energy that must be added to a liquid substance, to transform a quantity of that substance into a gas. The heat of vaporization is a function of the pressure at which that transformation takes place.

Hi!

1. Assume that these percentages are the mass.

2. For each of Fe and O, divide the mass by the Ar (relative atomic mass).

Fe: 72.4/55.8 = 1.297 moles

O: 27.6/16 = 1.725 moles

3. Work out which mole value is smallest, then divide the bigger mole value by the smaller one.

1.297 is smaller than 1.725, so your empirical formula is 1.1297/1.1297 = 1 atom of iron, and 1.725/1.297 = 1.33 atoms of oxygen.

4. Ensure your atom values are whole numbers.

1.33 is not a whole number, so multiply both 1 and 1.33 by 3.

5. Write out your empirical formula.

Fe3O4

Hope that helps!

The empirical formula for magnetic iron oxide, given that it has 72.4% iron and 27.6% oxygen by mass, is Fe3O4.

The problem asks us to find the empirical formula for magnetic iron oxide. Given the percentage composition of iron and oxygen in the compound, we can look at it as if we had 100g of the substance. This would give us 72.4g of iron (Fe) and 27.6g of oxygen (O).

First, we convert these amounts to moles. The atomic mass of iron is approximately 55.845 g/mol and for oxygen is approximately 16.00 g/mol. Therefore, we have 1.3 mol Fe and 1.72 mol O.

To find the empirical formula, we divide each of these by the smallest number of moles to get a ratio. So, we have Fe1O1.3. However, an empirical formula should consist of whole numbers. Therefore, if we multiply both by the same factor, in this case, a factor of 3 will give us whole numbers, we get Fe3O4. Therefore, the empirical formula for magnetic iron oxide is Fe3O4.

https://brainly.com/question/32125056

#SPJ3

Answer:

2.0 × 10−3

Explanation:

this is the correct answer, i don't know why people gave the other answer 3/5 stars because that answer and work was correct.

The average rate of reaction for the first 580 seconds is 2.0 × 10−3 M/s.

The average rate is defined as the ratio of the change in concentration to the time taken. We are required here to find the average rate of the reaction over the first 580 seconds.

Hence, we have;

average rate = 1.8 M - 0.6 M/580 s - 0 s = 1.2 M/580 s  = 2.0 × 10−3 M/s

Hence, the average rate of reaction for the first 580 seconds is 2.0 × 10−3 M/s.

Learn more about average rate of reaction: https://brainly.com/question/11334504

Answers:

1. D) 91.3 J

2. A) The metal with the higher specific heat capacity

3. B) 318 K

Step-by-step explanation:

1. E, q, w

ΔE = q + w

By convention, anything leaving the system is negative and anything entering the system is positive.

q = 0.0 J

w = -91.3 J

E = 0.0 - 91.3 = -91.3 J

2. Specific heat capacity

q = mCΔT

C = q/(mΔT)

If q and m are the same for each metal, then

ΔT ∝ 1/C = k/C  

As C increases, ΔT decreases.

Thus, the metal with the higher specific heat capacity will have the smaller temperature change.

3. Temperature on mixing

There are two heat flows in this problem.

Heat gained by cold water + heat lost by hot water = 0

                      q₁                    +                 q₂                 = 0

                 m₁CΔT₁                +             m₂CΔT₂           = 0

                 m₁ΔT₁                 x +              m₂ΔT₂           = 0

Data:

m₁ = 30.0 g

T₁ = 280. K

m₂ = 50.0 g

T₂ = 340 K

Calculations:

ΔT₁ = T_f - Ti = T_f - T₁ = (T_f - 280.) K  

ΔT₂ = T_f - Ti = T_f - T₂ = (T_f - 340) K  

30.0(T_f - 280.) + 50.0(T_f - 340)   = 0

30.0T_f - 8400 + 50.0T_f - 17 000 = 0

                           80.0T_f - 25 400 = 0

                                          80.0T_f = 25 400

                                                  T_f =25 400/80.0

                                                  T_f = 318 K

The final temperature of the mixture is 318 K.

The coulomb whose symbol is (C),  is used to express charge. It is the SI unit of  electric charge.

1 C is equivalent to charge carried by 6.24×10¹⁸ electrons. Although electrons are negatively charged, the Coulomb expresses both positive and negative charges.

Answer: Coulomb

Explanation:

[tex]Q=I\times t[/tex]

where Q= quantity of electricity

I = current in amperes

t= time in seconds

Thus charge is in coulomb. 1 coloumb of charge appears whe 1 ampere current is passed for 1 second.

Newton is the unit of force.

[tex]1kgms^{-2}=1Newton(N)[/tex]

Joule is the unit of energy.

[tex]1kgm^2s^{-2}=1 Joule[/tex]

Answer:

7. A) I, II ; 8. D) 2.34e9 kJ

Step-by-step explanation:

7. Combustion of ethanol

I. The negative sign for ΔH shows that the reaction is exothermic.

II. The enthalpy change would be different if gaseous water were produced.

That's because it takes energy to convert liquid water to gaseous water, and this energy is included in the value of ΔH.

III. The reaction is a redox reaction, because

IV. The products of the reaction occupy a smaller volume than the reactants, because 3 mol of gaseous reactant are forming 2 mol of gaseous product.

Therefore, only I and II are correct.

7. Hindenburg

Data:

  V = 2.00 × 10⁸ L

  p = 1.00 atm

  T = 25.1 °C

ΔH = -286 kJ·mol⁻¹

Calculations:

(a) Convert temperature to kelvins

T = (25.1 + 273.15) K = 298.25 K

(b) Moles of hydrogen

Use the Ideal Gas Law:

pV = nRT

n = (pV)/(RT)

n = (1.00 × 2.00 × 10⁸)/(0.082 06 × 298.25) = 8.172 × 10⁶ mol

(c) Heat evolved

q = nΔH = 8.172 × 10⁶ × (-286) = -2.34 × 10⁹ kJ

The hydrogen in the Hindenburg released 2.34e9 kJ .

Hello there!

Let's explain to you the different variables in the PV=nRT equation:

PV=nRT:

P = Pressure

V = Volume

n = Moles (number of moles)

R = Gas Constant (universal)

T = Temperature

This is the ideal use of the gas law.

When calculating these different variables, its units are:

P = ATM (atmospheres)

V = L (liters)

n = mol (Moles)

R = J (Joule)

T= K (Kelvin)

certain types of rock, like granite, are very resistant to weathering. Igneous rocks tend to weather slowly because it is hard for water to penetrate them. Other types of rock, like limestone and marble are easily weathered because they dissolve easily in weak acids.

When a solid (solute) comes in contact with the liquid (solvent), the solute goes about C) dissolution, in which the solid dissolves into the liquid.

~

As this is with regards to solute and solvent, the solid will eventually dissolve in the liquid. The answer is C. dissolution.

Answer:

Bromine (Br)

Explanation:

the answer is b: it shows how temperature of a substance changes when heated.

According to the forces of attraction, the statement which is true for a heating curve is that it  shows how the temperature of a substance changes when heated.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

Learn more about forces of attraction,here:

https://brainly.com/question/2122941

#SPJ3

Answer:

The nucleus emits particles and/or energy

Explanation:

In nuclear decay, the nucleus of an unstable atom (usually with a high neutron number over protons) splits into lighter more stable atoms. The process involves the release of energy particles such as neutrons or beta particles and energy. The released particles bombard with the other unstable atoms in the vicinity and split them producing  a chain reaction.

Answer:

The nucleus emits particles and/or energy.

Explanation:

proving the answer is right on the bottom

Answer:

Explanation:

The freezing point depression in a solvent is a colligative property: it depends on the number of solute particles.

The equation to predict the freezing point depression in a solvent is:

Where,

The calcualtions are in the attached pdf file. Please, open it by clicking on the image of the file.

Answer: -1.86

Explanation: Got it right on edg

Answer:

Trial 1 : n = 0.0002241 moles

Trail 2 :  n = 0.0002188 moles

Explanation:

Let's bring out the data in the question;

Pressure (P) = 1.2 atm

Number of moles (n) = ?

Both trials contain different values of Volume (V) and temperature (T)

The equation that relates all four parameters (V, T, P and n) is the ideal gas equation. It is given as;

PV = nRT where R = gas constant = 0.0821 L atm K−1 mol−1

Soving for n, we have;

n = PV / RT

Trial 1

Volume (V) = 4.2 ml = 0.0042 L (Converting to L by dividing by 1000)

Temperature (T) = 0.9 + 273 = 273.9K (Converting to Kelvin temperature)

n = (1.2 * 0.0042) / (0.0821 * 273.9)

n = 0.00504 / 22.48719

n = 0.0002241 moles

Trial 2

Volume (V) = 4.1 ml = 0.0041 L (Converting to L by dividing by 1000)

Temperature (T) = 0.9 + 273 = 273.9K (Converting to Kelvin temperature)

n = (1.2 * 0.0041) / (0.0821 * 273.9)

n = 0.00492 / 22.48719

n = 0.0002188 moles

One of the most common devices for measuring temperature is the glass thermometer. This consists of a glass tube filled with mercury or some other liquid, which acts as the working fluid. Temperature increase causes the fluid to expand, so the temperature can be determined by measuring the volume of the fluid.

Liquid-in-glass thermometers depend on change in the volume of a liquid as temperature changes.

Every thermometer makes use of a thermometric property. The thermometric property is the property of the substance that changes with change in temperature.

In the case of liquid-in-glass thermometers, the thermometric property is the change in the volume of a liquid with change in temperature.

The liquid used must have high expansivity and must expand and contract uniformly as temperature changes.

Hence, as the liquid expands and contracts with temperature, the height of the  liquid can be used to measure temperature.

https://brainly.com/question/8238740

Answer: pH = 6.77

Explanation:

1) Chemical equilibrium

2) Equilibrium constant, Kw

3) pH

The pH of pure water at 40.0°C, given an autoionization constant (Kw) of 2.92 × 10-14, would be approximately 6.768. This value is derived from using the equations Kw=[H+][OH-] for the autoionization of water and pH = -log[H+] to calculate the pH.

The question asks about the pH of pure water at 40.0°C if the autoionization constant (Kw) at this temperature is 2.92 × 10-14. Kw is the product of the molar concentrations of H+ ions and OH- ions in water. At any given temperature, Kw remains constant. In pure water (or any neutral solution), [H+] = [OH-] and therefore, pH = pOH.

As mentioned, Kw = [H+][OH-] , so in neutral water [H+] = [OH-] = sqrt(Kw). Given that Kw is 2.92 *10^-14, we can calculate [H+] = sqrt(2.92 *10^-14) = 1.708 *10^-7 M.

The formula to find the pH is pH = -log[H+]. Substituting in, pH = -log(1.708 *10^-7) = 6.768 which is slightly on the acidic side because the ideal neutral pH in standard conditions (25°C) is 7.

This demonstrates that the pH of pure water decreases (becomes more acidic) as the temperature increases.

https://brainly.com/question/14468224

#SPJ12

Answer:

Explanation:

1) First law of thermodynamic (energy balance)

2) Energy change of each substance:

Heat released or absorbed = mass × Specific heat × change in temperature

       Heat₁ = 49.9 g × 1 cal / g°C × (345 K - 317 K) = 49.9 g × 1 cal / g°C × (28K)

       Heat₂ = 49.9 g × 1 cal / g°C × (317 K - 298 K) = 49.9 g × 1 cal / g°C × (19K)

       Heat₃ = Ccal × (317 K - 298 K) = Ccal × (19K)

4) Balance

49.9 g × 1 cal / g°C × (28 K) = 49.9 g × 1 cal / g°C × (19 K) + Ccal × (19 K)

Ccal = [49.9 g × 1 cal / g°C × (28 K) - 49.9 g × 1 cal / g°C × (19 K) ] / 19K

Ccal = 23.6 cal/ K

       23.6 cal / K × 4.18 J / cal = 98.6 J/K

Which rounded to 2 signficant figures leads to 99 J/k, which is the first choice.

Calorimetry is the measurement technique, in which heat of the chemical reactions and heat capacity is measured. The value of Ccal for the calorimeter is 99 J/K.

According to the first law of thermodynamics, the energy cannot be created nor be destroyed. It can be transferred from one form to another.

Such as:

Also, from the formula, it can be calculated as:

Given that,

Now, substituting the values, heat released by the water will be:

Similarly, heat absorbed by the cold water will be:

Now, the overall heat absorbed by the calorimeter will be equal to:

The value of Ccal will be:

Therefore, the Ccal for the calorimeter will be equal to approximately 99 J/K.

To know more about calorimeter, refer to the following link:

https://brainly.com/question/15187880?referrer=searchResults

According to Le Chatelier's principle, adding additional reactant to a system will shift the equilibrium to the right, towards the side of the products. ... By Le Chatelier's principle, we can predict that the amount of methanol will increase, thereby decreasing the total change in CO.

The body of theory which explains the physical properties of matter in terms of motion so I think it’s A

The kinetic molecular theory is an atomic description of gaseous, liquid, and solid matter. It states that these molecules are in constant, random motion with kinetic energy dependent on temperature. This theory is fundamental in explaining properties of matter including the ideal gas law.

The kinetic molecular theory is a scientific model that explains the behavior of gases. According to this theory, gases are comprised of a large number of tiny molecules, which are widely separated and in constant, random motion. These molecules engage in elastic collisions with each other and the walls of their container. The speed of these molecules, and consequently their kinetic energy, is determined by their absolute temperatures.

This theory is also extended to explain the properties of solids and liquids in terms of continuous random motion of atoms and molecules. In other words, the kinetic molecular theory is essentially an atomic description of matter, providing detailed explanations for various phenomena such as temperature, pressure, and heat transfer, among others.

Moreover, the ideal gas law ties in closely with the kinetic molecular theory. It can be expressed in terms of the mass of the gas's molecules and the average of the molecular speeds squared.

https://brainly.com/question/15013597

#SPJ3

The Kinetic Theory of gases states that the gases are made of small particles (atoms or molecules) which are in random motion.

Postulates of Kinetic Molecular Theory of gases:

1. All gases are made up of a large number of minute particles of molecules.

2. The molecules are separated from one another by large distances, called as intermolecular spaces.

3. The molecules are in the state of rapid motion in all directions. They collide with each other and the walls of the container, and thus change their directions.

4. There is no loss of energy when the molecules collide among themselves and the wall of the container.

5. The molecules are independent of each other as the molecules has no forces of interaction (repulsive or attractive) between molecules.

6. The pressure exerted by the gas is due to the collision of the molecules with the walls of the container per unit area.

7. The average Kinetic energy of the gas molecules is directly propotional to the absolute temperature.

Answer: vibrating molecules

Explanation:

a p e x

The answer should be C. Technology is the application of the knowledge gained by science.

Answer:

C. Technology is the application of the knowledge gained by science.

Explanation:

Science is about the discovery of some novel compounds such as cancer curing drugs or understanding the kinetics of reaction mechanisms. Technology takes the discovery made by science and upscales the process and makes it more efficient. Technology involves stem cell engineering to create clones or making pesticide resistant plants.

Is the atoms of electric

F > N > B > Be > Li. This ranking is based on the decreasing effective nuclear charge (Zeff) experienced by a valence electron in the listed elements.

The element lithium (Li) has the lowest effective nuclear charge. One valence electron is 2s orbital. The nucleus has three protons (atomic number 3), however the inner electrons in the[tex]1s^2[/tex] orbital shield the valence electron, reducing its effective charge.

The Beryllium (Be) follows. The 2s orbital has two valence electrons. Despite having a higher atomic number (4) than lithium, the presence of two inner electrons in the [tex]1s^2[/tex] orbital provides more shielding and a somewhat higher effective nuclear charge.

Boron (B): Three valence electrons in the [tex]2s^2 2p^1[/tex]configuration. Boron's nucleus has more protons (atomic number 5), making it more positive. Compared to beryllium, the [tex]2p^1[/tex] electron provides less shielding for the valence electron, but the [tex]1s^2[/tex] electrons still protect the [tex]2s^2[/tex] electrons.

Nitrogen has a higher effective nuclear charge than boron. One additional proton (atomic number 7) in its nucleus boosts its positive charge. The presence of three [tex]2p^2[/tex] electrons reduces the shielding effect on the valence electron, enhancing its nucleus attraction.

Fluorine (F) has the highest effective nuclear charge. Nine protons make its nucleus extremely positively charged. Seven [tex]2p^5[/tex] electrons reduce shielding and attract the valence electron to the nucleus, resulting in the highest effective nuclear charge. Therefore, F > N > B > Be > Li is the decreasing order.

Learn more about effective nuclear charge, here;

https://brainly.com/question/12369639

#SPJ12

The effective nuclear charge (Zeff) typically increases from left to right across a period in the periodic table. Therefore, for the elements F, Li, Be, B, and N, the rank order by Zeff, from lowest to highest, would be: Li < Be < B < N < F.

The concept being asked here involves effective nuclear charge (Zeff), which highly depends on position in the periodic table. Generally, Zeff increases from left to right across a period. So, for a valence (outermost) electron in the elements you provided: F, Li, Be, B, and N, we would expect this trend to hold. The effective nuclear charge can be thought of as the net positive charge experienced by an electron in an atom. Inner electrons shield outer electrons from the full charge of the nucleus, leading to this effective reduction in charge.

Thus, using that knowledge, we can rank these elements as follows: Li < Be < B < N < F. This order means that Fluorine (F), being the furthest right on the periodic table, has the highest effective nuclear charge. The atomic nucleus of Fluorine exerts a stronger pull on its valence electron relative to the other elements that have been listed.

https://brainly.com/question/33631338

#SPJ3

ya got to go get sum to eat then get it

Most likely, the production of the 1,4-adduct yields a less-substituted alkene in this situation. Following the 1,2-adduct pathway ensures that the remaining double bond is stabilized by the peripheral methyl group (trisubstituted), rather than making the new double bond disubstitited.

Hope this helps!