A series of lines in the spectrum of neutral Li atoms rise from transitions between 1s2 2p1 2P1s 2 2p 12 and 1s2nd1 2D1s 2 nd 12 D and occur at 610. 36 nm, 460. 29 nm, and 413. 23 nm. The d orbitals are hydrogenic. It is known that the transition from the 2P 2 P to the 2S 2 S term (which arises from the ground-state configuration 1s22s1)1s 2 2s 1 ) occurs at 670. 78 nm.


Calculate the ionization energy of the ground-state atom

Answer:Tungsten is made of tungsten while Nichrome is made of nickel chromium. ... Tungsten is used to make filament of bulbs. Nichrome have high resistivity than tungsten.

Explanation:i hope u have a wonderful night and stay safe

Answer:

full

Explanation:

Answer:

Five points of Dalton's atomic theory:

1) all elements are made up of atoms.  

2) atoms are so small that they cannot be divided any further.  

3) an atom can neither be destroyed nor be formed.  

4) atoms of an element are similar, they possess the same mass and same properties.  

5) atoms of different elements combine in a definite ratio to form compounds.  

Due to further experimentation, it was concluded that an atom is made up of small particles identified as protons, neutrons, and electrons. They can be further subdivided.

Another change is the presence of isotopes of atoms of different elements. Hence, atoms of the same element can also have different masses.

Hope this helps, have a nice day/night! :D

As per Dalton's atomic model atoms are the minuscule, distinct building blocks of all stuff.

What is Dalton's atomic model?

Dalton proposed that the concept of atoms may be used to explain the laws of conservation of mass as well as definite proportions. He proposed that atoms, of the kind, that he described as "solid, tightly compacted, hard, impenetrable, moving particle," are the smallest, indivisible units of matter.

Dalton's atomic model is as fellow:

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Starting and stabilizing the stir function.

Pouring solids into a beaker or other container. To pour liquid, other types of funnels can be utilized. Pouring liquid into a beaker. A powder funnel is a funnel with a broad opening that is used for solids.

Start by beginning and stabilizing the stir function when heating a solution to boiling on a hot plate. To begin, reduce the heat to a medium setting. After approximately ten minutes of not witnessing boiling, increase the heat setting if required. When a certain amount of solute is dissolved in a solvent at constant pressure, the net result of energy absorbed or released as heat by the solution.

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Answer:

2.040 mol CO

Explanation:

First, write out your reaction:

CO + O2 --> CO2

Balance the reaction:

2CO + O2 --> 2CO2

Now divide the 32.65 g O2 by the molar mass of O2 (32.00 g/mol) to get moles of O2. Then multiply by the mole ratio of 2 mol CO for every 1 mol O2 to get moles of CO needed to fully react.

32.65 g O2 / 32.00 g/mol = 1.020 mol O2

1.020 mol O2 • 2 mol CO / 1 mol O2 = 2.040 mol CO

The balanced equation for the reaction between sodium fluoride and bromine gas is _NaF + _Br2 → _NaBr + _F2 Balancing chemical equations.

The following procedure is commonly used to balance chemical equations:

Step 1: Begin by writing the unbalanced equation.

Count the number of atoms of each type on both the reactant and product sides.

Step 2: Choose an element to balance first.

Usually, the element that appears in only one reactant and one product is selected.

Oxygen is frequently selected because it is present in almost all compounds.

For polyatomic ions, balance the elements contained within the ion as a single unit.

Step 3: Balance the element you chose in step 2 by adding the correct coefficient to the appropriate compound.

Make sure that you do not alter the chemical formula of the compound.

Step 4: Repeat the previous steps until all elements in the equation are balanced.

The correct coefficients when the equation is balanced are:

1 NaF + 1 Br2 → 1 NaBr + 1 F2

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Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

When using the ideal gas equation, if the numerical value of R is 0.08206, then the units of the gas constant (R) are L atm/mol K.

The ideal gas equation is PV=nRT, where P represents pressure, V is volume, n is the number of moles of the gas, R is the gas constant, and T is the temperature in Kelvin.

Let's break down the units of each term in the ideal gas equation:

P: Pressure is typically measured in units of atmospheres (atm) in this context.

V: Volume is commonly measured in liters (L).

n: The number of moles (n) is a unitless quantity representing the amount of substance.

T: Temperature is measured in Kelvin (K).

By substituting the units into the ideal gas equation, we have:

(L atm) = (mol) × (L atm/mol K) × (K)

Since both sides of the equation must have the same units, the units of the gas constant (R) are L atm/mol K.

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Answer:

The three laws of Chemical Reaction are .The law of constant proportions. The law of multiple proportions. The law of reciprocal proportions.

A chemical compound is always found to be made up of the same elements combined together in the same fixed proportion by mass.

potassium and chlorine gas ---> chloride.

Hope this helps, have a good day.✌

Answer:

when earthquakes are ready strong the ground almost liquefies. There was a pirate trading post on an island and they experienced an earthquake so strong entire buildings were 'swallowed' by sand.

Explanation:

I read a book about it awhile back sorry I couldn't recall the exact location of the island(I think it was in the Caribbean but I'm not sure)

Answer:

Carbon dioxide is added to the atmosphere by human activities. When hydrocarbon fuels (i.e. wood, coal, natural gas, gasoline, and oil) are burned, carbon dioxide is released. During combustion or burning, carbon from fossil fuels combine with oxygen in the air to form carbon dioxide and water vapor.Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas. Each year, five and a half billion tons of carbon is released by burning fossil fuels.Carbon dioxide causes about 20 percent of Earth's greenhouse effect; water vapor accounts for about 50 percent; and clouds account for 25 percent.Likewise, when carbon dioxide concentrations rise, air temperatures go up, and more water vapor evaporates into the atmosphere—which then amplifies greenhouse heating

Answer: Density is 0.39g/ml and will float

Explanation:

Density is mass/volume : 1.95g/5.0ml = 0.39g/ml

This sample will float on water because a object with a density less than 1g/cm3 will float. 1 cubic centimeter equal 1 ml.

If water mass A were to intersect with NADW and had the same temperature as NADW but was fresher, it would mix with NADW, creating a less dense water mass than both NADW. NADW would flow underneath water mass A due to the difference in density.

Based on my knowledge of thermohaline circulation, if water mass A were to intersect with NADW and had the same temperature as NADW but was fresher, it would mix with NADW. When two water masses with different properties come into contact, they tend to mix due to turbulence and diffusion.

In this scenario, since water mass A is fresher, it has a lower salinity compared to NADW. When they mix, the resulting water mass would have a salinity that is lower than NADW but higher than water mass A. The density of a water mass is determined by its temperature and salinity. In this case, since the temperature of water mass A is the same as NADW, but it has a lower salinity, the resulting mixed water mass would be less dense than both NADW and water mass A.

As a result, the mixed water mass would be less likely to sink compared to NADW. Therefore, it is more likely that NADW would flow underneath water mass A rather than the other way around.

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Answer:

D. Purchase the equipment and chemicals you will need​

Explanation:

The number of units of aluminum chloride (AlCl₃) that can be produced from 30 atoms of aluminum (Al) is 30 units

The balanced equation for the reaction is given below:

2Al + 3Cl₂ — > 2AlCl₃

From the balanced equation above,

2 atoms of Al reacted to produce 2 units of AlCl₃.

With the above information, we can determine the number of units of AlCl₃ that can be produced by the reaction of 30 atoms of Al. This can be obtained as follow:

From the balanced equation above,

2 atoms of Al reacted to produce 2 units of AlCl₃.

Therefore,

30 atoms of Al will also react to produce 30 units of AlCl₃.

Thus, 30 units of AlCl₃ were obtained from the reaction.

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Answer:

C 21 H 38 NCl

Explanation:

I hope this helps...

Those who prefer greater CO2 levels over lower oxygen levels, or "capnophiles," will benefit most from a working candle jar.

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If a medicine has a dosage of 20mL, there are 757 doses in a 4 gallon bottle of medicine.

A medicine is a substance or preparation that is used to prevent, treat, or alleviate symptoms of a disease or medical condition.

To calculate the number of doses in a 4 gallon bottle, we first need to know the number of milliliters in 4 gallons.

1 gallon = 3,785.41 milliliters (ml)

Thus, 4 gallons = 4 × 3,785.41 = 15,141.64 ml

Given that 1 dose is 20 ml, the number of doses in a 4 gallon bottle is :

Number of doses = Total volume of medicine / DosageNumber of doses = 15,141.64 / 20

Number of doses = 757.08

Hence, there are 757 doses in a 4 gallon bottle of medicine.

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The statement that describes a question that can guide the design of a scientific investigation could be about the necessity of a controlled variable. The correct answer is A.

It is a variable whose values are controlled by the researcher during the course of experimental investigations.

When designing an experiment, it is necessary to identify the different variables that would be involved for a successful investigation.

Variables can be independent, dependent, controlled, or constant. Identifying the necessary variables will help in designing the experiment.

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The answer to this question is D) All of the amino acids. When subjected to an electric current towards the positive electrode (+) at a pH of 5.7, all three amino acids in the mixture will be affected.

Amino acids are molecules that contain both a carboxyl group (-COOH) and an amino group (-NH2) that can act as both an acid and a base, respectively. At different pH values, these groups can become either positively or negatively charged. The isoelectric point (pI) is the pH at which an amino acid has a net charge of zero.
At a pH of 5.7, all three amino acids in the mixture will have a net positive charge, meaning they will be attracted to the negative electrode (-) and repelled by the positive electrode (+). However, as they move towards the negative electrode (-), they will encounter regions of differing pH values, which can affect their charge and behaviour.
Lysine, with a pI of 9.7, will become increasingly negatively charged as it moves towards the negative electrode (-), causing it to slow down and potentially even reverse direction. Tyrosine, with a pI of 5.7, will remain neutral and unaffected by the electric current. Glutamic acid, with a pI of 3.2, will become increasingly positively charged as it moves towards the negative electrode (-), causing it to accelerate and potentially even reach the electrode.
Overall, the behaviour of the amino acid mixture will be complex and depend on the specific conditions of the electric field and pH gradient. However, all three amino acids will be affected by the electric current in some way.

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Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

The volume, in l, of 10.0 m hcl needed to make 2.00 l of 2.00 m hcl solution by dilution with water is 0.400 L. The correct answer is option b (0.400 L).

To make a 2.00 M HCl solution by diluting 10.0 M HCl, we can use the formula:

M1V1 = M2V2 ,where M1 is the initial concentration (10.0 M), V1 is the initial volume (unknown), M2 is the final concentration (2.00 M), and V2 is the final volume (2.00 L).

Rearranging this equation to solve for V1, we get:

V1 = (M2V2) / M1

Plugging in the values, we get:

V1 = (2.00 M x 2.00 L) / 10.0 M

V1 = 0.400 L

Therefore, the volume of 10.0 M HCl needed to make 2.00 L of 2.00 M HCl solution by dilution with water is 0.400 L.

Dilution is defined as the process of adding more solvent to a solution. When diluting a solution, the concentration of the solute is reduced. It's important to note that when diluting a solution, the number of moles of the solute remains the same.

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Answer

0.1

Explanation

Given:

mass of HCl = 0.915g

volume of HCl = 250 mL

We know the molar mass of HCl = 36,458 g/mol

Solution

Step 1: covert the volume from mL to L

1 mL = 0.001 L

therefore 250 mL = 0.25 L

Step 2: Calculate the number of moles of HCl

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 0.915 g/36,458 g/mol

n = 0.025 mol

Step 3: Calculate the molarity

C = n/V where C is the molarity, n is the moles and V is the volume

C = 0.025 mol/0.25 L

C = 0.1

The structure of an electron could not be seen by using an electron microscope.

An electron is a  small particle having a negative charge that is found in all the atoms. Streams of electrons made by special equipment which can be used for the radiation treatment.

An electron microscope is a microscope which uses a beam of accelerated electrons as a source of illumination. As the wavelength of an electron can be up to 100,000 times shorter than the visible light photons, electron microscopes having higher resolving power than to the light microscopes and can reveal the structure of the smaller objects. Electron microscopes use shaped magnetic fields to form an electron optical lens systems that are analogous to the glass lenses of an optical light microscope.

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Answer:

c

Explanation:

and that's bc it will not share stay the same