The principal quantum number of the electrons that are lost when tungsten forms a cation is A) 1 B) 2 C)3 D) 4 E) 5 F) 6

Answer:

A

The nuber of each one should be same

Answer:

Krypton gain

strontium lose

xenon neither gain or lose

Answer:

When chlorine water is added to potassium bromide solution, chlorine will displace the bromine from the salt solution. The chlorine will be REDUCED (gain electrons) to chlorine ions. The bromide ions will be OXIDISED (lose electrons) to become bromine. The bromine will turn the solution orange.

Explanation:

HAVE A GOOD DAY

Mass after 60 years:

2 kg of cesium-137 will remain after 60.0 years.

What is Half-life?

The duration needed for a quantity to decrease to half of its initial value is known as the half-life.

Given:

N0 = is the initial amount of cesium-137 = 8.0 Kg

N = is the amount remaining after a time =  Unknown

t =  Duration of cesium-137 decay in 8.0 Kg = 60 years

t1/2 = half-life of cesium-137 = 30.0 years

Formula = N/No = (1/2)^t/t1/2

After putting the value:

N/8= (1/2)^60/30

N/8= (1/2)^2

N/8= 1/4

4N= 8

N= 8/4

N= 2 Kg

As a result, 2 Kg of cesium-137 will be present after 60 years.

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Answer:MgI2

Explanation:

Ionizing radiations are electromagnetic radiation with energy low enough to damage cells.

Why does ionizing radiation occur?

Human activities can increase exposure to ionizing radiation, including producing smoke detectors that include radioactive materials, producing electricity from nuclear power, testing nuclear weapons, and creating medical x-rays.

A type of energy known as radiation works by taking electrons away from the atoms and molecules of various substances, including air, water, and biological tissue. Ionizing radiation can pass through these materials and move undetectedly. A short-term dose of between 2 and 10 sieverts would result in severe radiation illness, with an increasing risk that it would be fatal.

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Answer: It is B

Explanation:

Answer:

Therefore, 1.00 mole of the gas is present in the container.

Explanation:

The following data were obtained from the question:

Volume (V) = 22.41L

Temperature (T) = 273K

Pressure (P) = 101.325 kPa

Gas constant (R) = 8.31 L.kPa/mol.K.

Number of mole (n) =...?

The number of mole of the gas in the container can obtained by applying the ideal gas equation as illustrated below:

PV = nRT

Divide both side by RT

n = PV /RT

n =101.325  x 22.41 / 8.31 x 273

n = 1.00 mole.

Therefore, 1.00 mole of the gas is present in the container.

Answer:

1 mole of gas is contained in 22.41 liters at 101.325 kPa and 0ᴼC

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.

In this case:

Replacing:

1 atm*22.41 L=n* 0.082 \(\frac{atm*L}{mol*K}\)*273 K

Solving:

\(n=\frac{1 atm*22.41 L}{0.082\frac{atm*L}{mol*K} *273 K}\)

n=1  mole

1 mole of gas is contained in 22.41 liters at 101.325 kPa and 0ᴼC

Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

Answer:

The acid mist is known as laze - a term combining the words lava and haze - when laze and sea water combine. Laze is potentially deadly if inhaled and can be hot and corrosive. If anyone goes near it, they can experience breathing difficulties and irritation of their eyes and skin.

Explanation:

hope it helps :)

The amount of heat transferred to the water if the temperature of 60.0 g of water increases by 4.50 °C is 1.134Kj.

The quantity of heat transferred to a substance can be calculated using the following formula:

Q = mc∆T

Where;

According to the information in this question;

Q = 60 × 4.2 × 4.5

Q = 1134J

Therefore, the amount of heat transferred to the water if the temperature of 60.0 g of water increases by 4.50 °C is 1.134KJ.

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Answer:

For any given element, ionization energy increases as subsequent electrons are removed. For example, the energy required to remove an electron from neutral chlorine is 1251 kJ/mol. ... An even sharper increase in ionization energy is witnessed when inner-shell, or core, electrons are removed.

Hope it helps :)

Answer:

Pressure

Explanation:

Basically when you are pressing something you are applying force over an area thus Pressure is force divided by area.

Answer:

pressure

Explanation:

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This statement is false.

An empirical formula doesn't show the actual number of atoms of each element in a compound.

It  shows the simplest ratio of atoms in a compound.

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we would need 0.0025 moles of NaOH to reach the endpoint of the titration of the acetic acid unknown.
To determine the number of moles of NaOH necessary to reach the endpoint of the titration of acetic acid, you'll need some information from the experiment, such as the concentration of the NaOH solution and the volume of NaOH used.

To answer this question, we need to know the volume and concentration of the NaOH used in the titration of the acetic acid unknown. Once we have this information, we can calculate the number of moles of NaOH that were added to reach the endpoint of the titration.

Assuming that we have this information, we can use the following formula to calculate the number of moles of NaOH used:

moles NaOH = concentration of NaOH (in M) x volume of NaOH (in L)

For example, if we used 0.1 M NaOH and added 25 mL to reach the endpoint of the titration, the calculation would be:

moles NaOH = 0.1 M x 0.025 L
moles NaOH = 0.0025 moles

Moles of NaOH = (Concentration of NaOH) × (Volume of NaOH used)

After obtaining the moles of NaOH, you can use the stoichiometry of the reaction to find the moles of acetic acid. In the case of the reaction between NaOH and acetic acid, the ratio is 1:1.

Moles of acetic acid = Moles of NaOH

Knowing the moles of acetic acid, you can then determine the concentration of the unknown acetic acid solution using the volume of the solution titrated.

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Hello! HNO2 is not a strong acid so therefore your answer is A.

A rule of thumb, the rest are strong acids, so when you ever come across a similar question you will be able to rule out the wrong answers quicker :).

Strong acid list:

H2SO4

HNO3

HCLO4

HCLO3

HCL

HBr

HI

hope this helps!

Answer:

sorrrrrrrrrry

Explanation:

Answer:

condensation

Explanation:

the process that causes distance

After valves are opened and enough time has passed for net movement of particles between containers to stop, pressure of gas in middle container will be closest to 3 atmospheres as pressure will be halved after opening valves.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

Pressure will be halved after opening valves as it will be bifurcated ,thus, 9/2=4.5 which is closest 3 atmospheres.

Thus,the pressure of gas in the middle container will be closest to 3 atmospheres.

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Answer:

Nvr XD

Explanation:

Answer:

the world may never know

Explanation:

Millikan kept the oil droplet from interacting with any other particles by doing this experiment in a vacuum. The electric field produced between two charged plates was used to compute the charge of the oil droplet.

Scientists believed that the electron was a basic particle that could not be divided into smaller particles after Millikan determined the electron's mass. He demonstrated that electrons had a -1 charge and an extremely low mass.

Millikan's experiment greatly aided the discovery of the atomic structure. According to Millikan's experiment, an electron is a basic particle that may be utilized in many different sectors.

The goal of Millikan's experiment was to ascertain the charge of an electron in 1909. He was able to compute the mass of an electron thanks to this experiment.

A charged oil droplet was used in the experiment and allowed to fall into the air. By watching how the oil droplet descended through the air, its mass was calculated.

The oil droplet's acceleration was computed to determine its mass, and its speed was observed. According to Millikan's experiment, an electron is a basic particle that may be utilized in many different sectors. For scientists attempting to comprehend an atom's structure, it was a huge accomplishment.

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The first wave appear after 320 seconds and after the arrival of P wave

We can use the formula TD = d × t / 100 km

TD = d × t / 100 km

= ( 4000 km × 8 s ) / 100 km

= 32000 km /s / 100 km

= 320 seconds

The first s-wave will arrived in 320 seconds after the arrival of the first p-wave

The earliest waves to reach a seismograph are known as P waves, or primary waves. The fastest seismic waves, known as P waves, can pass through solid, liquid, or gas. On the medium they travel through, they leave a trail of compressions and rarefactions

The second waves to arrive during an earthquake are called S waves, or secondary waves. They can only pass through solids and are substantially slower than P waves

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Answer:

it is a result of hydrogen bonds present within water molecules.

Explanation:

when the water is transformed to ice at zero degrees Celsius, the water molecules are in crystal lattice in a structure that has a lot of empty space around each molecule.

Answer:

=0.15M

Explanation:

To get the moles of the unknown LiOH, calculate the number of moles of HCl in 12.3mL.

Using the stoichiometric coefficient, mole ratio 1:1.

This means that the number of moles is the same. This number of moles is contained in 18mL. Then Calculate the molarity (concentration) which is in 1000mL

See the explanation from the image I have shared with you for calculations.

Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, student a and student b are correct.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

q = n ×ΔH

where

q = amount of heat

n = no of moles

ΔH = enthalpy

n = w / M.M

Both students are correct as energy can be positive as well as negative. Any reaction in which energy is added, energy value comes out to be positive and reaction is called endothermic reaction. Any reaction in which energy is released, energy value comes out to be negative and reaction is called exothermic reaction.

Therefore, student a and student b are correct.

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Answer:

This question is incomplete

Explanation:

This question is incomplete. However, Jet fuels are produced/designed in such a way that they can absorb cold and become as cold as -47 °C; this is because of the cold temperature in which the jet flies. When the fuel absorbs this coldness, the movement of the molecules in the fuel begins to reduce (just like in every other substance undergoing coolness) and keeps reducing as the temperature keeps dropping. Ordinarily, if this temperature reduces to a particular point (freezing point), the movement of the molecules will stop totally leading to the fuel solidifying/freezing (which has happened sometime before the production of more improved fuel with lower temperature that is been used now).

NOTE: There are some perceived spelling errors in the question. For example, it appears the "moluses" is actually "molecules", "befire tge" is "before the" and "tenoerature" is "temperature".

Answer:

B. Took the test lol

Explanation:

hope this helps

Answer:

They begin with a hypothesis or a research question.

Explanation:

Hope this helps!

The first step is an observation.

The second step is a hypothesis.

The third step is an experiment.

The fourth step is your result.

The fifth step is your conclusion.

Hope it helps you! :)

\(*GraceRosalia*\)

Answer:

The change from a liquid phase to a gaseous phase.

so the answer would be it changed to a gaseous phase

---------------

This is what occurs when the vapor pressure of the liquid is equal to the atmospheric pressure exerted on the liquid.

However, keep in mind that 20 mSv per year is the recommended amount for any radiation worker and is still regarded quite safe. This is the most radiation most of us will ever be exposed to.

after 1st half life , remaining sample would be 100/2=50 g

after 2nd half life , remaining sample would be 50/2=25 g

after 3rd half life , remaining sample would be 25/2= 12.5 g

The half-life of a radionuclide is the amount of time it takes for half of its radioactive atoms to decay. A decent rule of thumb is that you will have less than 1% of the initial quantity of radiation after seven half-lives. Click here to learn more about half life.

A short-term and whole-body dosage would result in rapid sickness, such as nausea and a reduction in white blood cell count, followed by death.

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42.08 years of  time must pass before there is an acceptable radiation level at the site.​

What is the half-life of a radioactive material?

The half life of a radioactive substance is the period of time during which its mass or number of atoms is decreased to half of what it was initially. The time it takes for a radioactive substance (or half of its atoms) to break down or transform into another substance is commonly used to define half-life.

Radioactivity, as its name suggests, is the act of generating radiation without any external cause. This is accomplished by an atomic nucleus that is unstable for whatever reason and "wants" to surrender some energy in order to change its configuration to one that is more stable.

After first half-life will remain 2560/2 i.e. 1280g of radioactive substance.

After second half-life will remain 1280/2 i.e. 640g

After 3rd half-life will remain 640/2 i.e. 320g

After 4th half-life will remain 160g

After 5th half-life will remain 80g

After 6th, 7th and 8th half-life will remain 40g, 20g and 10g respectively

It takes 8 half-lives to reach acceptable level of radiation i.e. 8*5.26 years

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Explanation:

30 to the second power