the boiling point of o2 is higher than n2 due to group of answer choices ion-dipole forces. london forces. ion-ion forces. dipole-dipole forces. hydrogen bonding.

The number of moles of Kr present is 4.75 × 10⁻³ moles. The correct option is a. 4.75 × 10⁻³ moles

From the question, we are to determine the number of moles Kr present in 398 mg Kr.

From the formula,

\(Number \ of \ moles = \frac{Mass}{Atomic\ mass}\)

Mass of Kr = 398 mg = 0.398 g

Atomic mass = 83.798 g/mol

Number of moles = \(\frac{0.398}{83.798}\)

Number of moles = 0.0047495 mole

Number of moles ≅ 4.75 × 10⁻³ moles

Hence, the number of moles of Kr present is 4.75 × 10⁻³ moles. The correct option is a. 4.75 × 10⁻³ moles

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Answer:

21 gam

Explanation:

mH2SO4 = mddH2SO4.C% = 150. 14% = 21g

Answer:

protons=11

electrons=11

neutrons=12

Answer:

you have to use the avogadro's constant of 6.023×10^23 to calculate the number of molecules of carbon dioxide.and you also have to use the molecular mass which is 44.

35.5/44×6.023×10^23

=4.85×10^23

I hope this helps and sorry if it's wrong

Answer:

B: Sublimation

Explanation:

took the test on edge

Answer:

B on edge 2020

Explanation:

Please give brainliest

The example of the chemical nature of substances affecting the rate of reaction is large pieces of iron react slowly with acids while finely divided iron reacts more rapidly.

The chemical nature of a substance is the manner in which it interacts with other chemicals, both organic and inorganic. The chemical nature of a substance determines how it interacts with other substances, how it reacts under certain circumstances, and how it can be used.

The rate of reaction is the speed at which a chemical reaction occurs. The rate of a chemical reaction is determined by the amount of reactant consumed or the amount of product generated over time. The rate of reaction can be influenced by a number of factors, including temperature, pressure, and the presence of a catalyst.

The example of the chemical nature of substances affecting the rate of reaction is large pieces of iron react slowly with acids while finely divided iron reacts more rapidly. When iron is finely divided, it has a larger surface area available for chemical reactions, which speeds up the reaction rate.

In comparison, large pieces of iron have a smaller surface area exposed to the acid, causing the reaction to occur more slowly. Therefore, large pieces of iron react slowly with acids while finely divided iron reacts more rapidly.

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Adding ice to the liquid decreases the average kinetic energy of the particles of the liquid.

The temperature of a substance is defined as a measure of the average kinetic energy of the molecules of the substance. The average kinetic energy of the molecules of a substance is directly proportional to the temperature of the substance.

This implies that if I increase the temperature of a substance, the average kinetic energy of the molecules of the substance increases and vice versa.

Ice is at a lower temperature than water at room temperature. Thus, adding ice to water at room temperature decreases the temperature of the water and consequently decreases the average kinetic energy of its particles.

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The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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Answer:

I'm sorry, you didn't post the pictures.

Answer:

Chemists can determine the number of atoms in an amount of matter using a variety of techniques, such as mass spectrometry, X-ray diffraction, and atomic absorption spectroscopy. These techniques allow chemists to measure the mass and volume of a sample of matter and to analyze its chemical composition.

To determine the number of paper clips in a beaker without counting them by hand, you could use a balance to measure the mass of the beaker and the paper clips. You could then use the mass of a single paper clip to calculate the total number of paper clips in the beaker. Alternatively, you could measure the volume of the beaker and the paper clips and use the density of paper to calculate the total number of paper clips in the beaker.

Explanation:

Answer:

Answer: true

Explanation:

The classification of controlled substances that contains drugs with a high potential for abuse and addiction, but are approved for medical use is Schedule II.

The Drug Enforcement Administration (DEA) has five classifications, or schedules, for controlled substances based on their potential for abuse, medical use, and safety. Schedule II substances have a high potential for abuse and may lead to severe psychological or physical dependence, but they also have a currently accepted medical use in the United States with severe restrictions.

Examples of Schedule II substances include opioids such as fentanyl, oxycodone, and hydrocodone, as well as stimulants such as amphetamine and methylphenidate. These substances require a written or electronic prescription and cannot be refilled without a new prescription from a doctor.

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Answer:

D. Pressure

Explanation:

The rate of a reaction is defined as the speed at which the reactants are converted into products. Factors influencing the rate of a reaction are concentration, catalyst, temperature, surface area,  and pressure, etc.

In case of the reaction rate of gases, pressure will only have its affect as pressure do not have any influence on solid and liquid.

While concentration, surface area and catalyst influence all reaction rates including solid, liquids and gases.

Hence, the correct option is (d) pressure.

Answer:

1. at least two charged interacting parts

2. from the electric fields of charged subatomic particles

3 an arrow released from the bow

4Electrical fields of charged particles interact, bonding those with opposite charges.

5 the interaction of the electric fields of protons and electrons

6 The energy stored in the system increases.

7 Kinetic energy increases because the magnets move in the direction of the field.

8 Iron pieces accelerate toward the magnet, and the energy stored in the system decreases.

9  

The energy stored in the field decreases because the magnet moves in the direction of the field.

10 The energy stored increases and then decreases.

11 The wire was not connected to the source.

12  The electromagnet will become more powerful.

From the electric fields of charged subatomic particles, at least two charged interacting pieces, an arrow launched from the bow, Interaction between electrical fields of charged particles bonds those with opposing charges, the interaction between the protons' and electrons' electric fields.

An electric field is a physical field that surrounds electrically charged particles and acts as an attractor or repellent to all other charged particles in the vicinity. It can also refer to a system of charged particles' physical field.

The area of space surrounding an electrically charged particle or object in which the charge body perceives force is known as the electric field. Examples: -Charges and their arrangements, such as capacitors and battery cells, produce electric fields.

We can produce current flow by applying the pushing force required by electric fields. A circuit's electric field resembles an electron pump in that it is a sizable source of negative charges that can drive electrons.

Thus, From the electric fields of charged subatomic particles, at least two charged interacting pieces.

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Answer:

The bond order is 1.091

Explanation:

there really is no explanation.

Answer:

0.02 g/ml

Explanation:

si dividimos 10 con 500, es decir, 10/500, obtenemos 0.02. Las unidades serán g / ml.

Answer:

airing Your GizmoWatch to the GizmoHub App 10. Register ... NOTE: If any component is missing, please contact the store ... Gizmo Buddies can text the GizmoWatch ... Tap Kids to access your child's full profile. If you have more than one child, swipe left or right to ... portable devices with LCD panels may be used to help.

Explanation:

Alcohol is more soluble in water than ether. And CH4 is non polar. So, CH4 will be almost insoluble water.

CH3OH - most soluble

CH3-O-CH3 - second

CH4 - least soluble.

Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.

Solubility can be expressed in grams of solute in one liter of saturated solution. For example, the solubility in water at 25 oC is 12 g/L. Molar solubility is the number of moles of solute per liter of saturated solution. For example, 0.115 mol/L at 25 oC

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There are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2. Details about formula units can be found below.

Formula unit refers to the empirical formula of an ionic compound for use in stoichiometric calculations.

According to this question, there are 111g of CaCl2. The formula units can be calculated by multiplying the number of moles by Avogadro's number.

no of moles in CaCl2 = 111g ÷ 111g/mol = 1mol

Formula units of CaCl2 = 1mol × 6.02 × 10²³ = 6.02 × 10²³ formula units.

Therefore, there are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2.

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The earth’s magnetic poles are in the general direction of the planet’s geographic poles. the phrase "general direction" mean  different and complete opposite way.

A bar magnet that is suspended freely will always point north-south. This is a result of the bar magnet's south pole being drawn to the Earth's magnetic north pole (geographic south).

Geographic and magnetic poles on Earth are generated by various sources, thus they are not perfectly aligned. The outer core's swirling currents of liquid iron are what generate the Earth's magnetic field.

Thus, Option D is correct.

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Answer:

A group of cells working together is defined as a tissue and several tissues working together comprise an organ.

Explanation:

Answer: The specific heat of given metal is \(1.195 J/^{o}C\).

Explanation:

Given: Mass of sample = 22.8 g

Heat energy = 1450 J

Initial temperature = \(21.8^{o}C\)

Final temperature = \(75^{o}C\)

Formula used to calculate the specific heat is as follows.

\(q = m \times C \times (T_{2} - T_{1})\)

where,

q = heat energy

m = mass of substance or sample

C = specific heat

\(T_{1}\) = initial temperature

\(T_{2}\) = final temperature

Substitute the values into above formula as follows.

\(q = m \times C \times (T_{2} - T_{1})\\1450 J = 22.8 g \times C \times (75 - 21.8)^{o}C\\C = \frac{1450 J}{22.8 \times 53.2^{o}C}\\= 1.195 J/^{o}C\)

Thus, we can conclude that the specific heat of given metal is \(1.195 J/^{o}C\).

Answer:

2.0×10⁻⁶ mol

Prefix = (2)  

exponent = (-6)

Explanation:

Given data:

Number of molecules of water = 1.23×10¹⁸ molecules

Number of moles of water = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules of water

1.23×10¹⁸ molecules × 1 mol / 6.022 × 10²³ molecules

0.20×10⁻⁵ mol

2.0×10⁻⁶ mol

Prefix = (2)  

exponent = (-6)

The volume of hydrogen gas, if it were dry and at STP, would be approximately 19030 mL. None of the provided answer options match this value, so none of them are correct.

To determine the volume of hydrogen gas if it were dry and at STP (standard temperature and pressure), we need to apply the ideal gas law. The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure of the gas

V = volume of the gas

n = number of moles of the gas

R = ideal gas constant (0.0821 L·atm/mol·K)

T = temperature of the gas in Kelvin

First, let's convert the given temperature of 24 °C to Kelvin:

T = 24 °C + 273.15 = 297.15 K

Next, we need to determine the number of moles of hydrogen gas. To do this, we use the concept of partial pressure.

The partial pressure of hydrogen gas (PH2) can be calculated by subtracting the vapor pressure of water (Pwater) from the total pressure (Ptotal):

PH2 = Ptotal - Pwater

Ptotal = 736 mmHg

Pwater = 22.4 mmHg (vapor pressure of water at 24.0 °C)

PH2 = 736 mmHg - 22.4 mmHg = 713.6 mmHg

Now we can rearrange the ideal gas law equation to solve for the volume (V):

V = (nRT) / P

To find the number of moles (n), we can use the ideal gas law equation with the given conditions:

n = (PV) / (RT)

Substituting the values:

n = (713.6 mmHg * 30.0 mL) / (0.0821 L·atm/mol·K * 297.15 K)

Now we can calculate the number of moles (n).

n = (713.6 mmHg * 30.0 mL) / (0.0821 L·atm/mol·K * 297.15 K)

≈ 0.8418 mol

Now, we can substitute the values of n, R, and T into the equation V = (nRT) / P to calculate the volume (V) at STP:

V = (0.8418 mol * 0.0821 L·atm/mol·K * 273.15 K) / (1 atm)

≈ 19.03 L

Finally, we need to convert the volume from liters to milliliters:

V = 19.03 L * 1000 mL/L

≈ 19030 mL

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Answer:

A. Each type of cell carries out a specific function for the organism.

Explanation:

\(hope\) \(this\) \(helps!\) \(:)\)

Answer:

The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.

Explanation:

this is what will happen in water

In the subgranular zone

Solubility rules are used to predict the outcome of precipitation reactions, which involve the formation of insoluble products.

Solubility rules are guidelines that help predict the solubility of different compounds in water. These rules are based on the general principles of ionic interactions and the solubility of common ionic compounds. When two soluble compounds are mixed together, a precipitation reaction may occur if the resulting compound formed is insoluble in water.

In precipitation reactions, the reactants are typically aqueous solutions of two different compounds. The solubility rules are used to determine if a precipitate will form by identifying the combination of ions that can form an insoluble compound. The rules state that certain combinations of ions will result in the formation of insoluble products, while others will remain soluble in water.

In conclusion, solubility rules are used to predict precipitation reactions, which involve the formation of insoluble products. These rules help determine whether certain combinations of ions will result in the formation of a precipitate or if the compounds will remain soluble in water. By understanding the solubility properties of different ions, scientists and chemists can predict the outcome of chemical reactions and better understand the behavior of substances in solution.

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Answer:

Solids is the answer hope this helps