CHEMISTRY HIGH SCHOOL

A hydrogen electron is elevated from level 1 to level 2. Another electron is elevated from level 2 to level 4. The transition requiring the greatest energy change is level 1 to level 2level 2 to level 4both require the same amount of energy

Answers

Answer 1
Answer:

Answer:

A hydrogen electron is elevated from level 1 to level 2. Another electron is elevated from level 2 to level 4. The transition requiring the greatest energy change is level 2 to level 4.

Additional question: Light is emitted by electrons when they drop from one energy level to a lower level. Which transition results in the emission of light with the greatest energy?

Answer: level 4 to level 2

Explanation:

Hope this helps! :D

Answer 2
Answer:

the 2to 4 transition is bigger


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COLLEGE

A compound has the empirical formula CH and a molar mass of 78.11 g/mol . Find its molecular formula.

Answers

Answer:

Molecular Formula = C6H6

Explanation:

Empirical Formular = CH

Molar Mass = 78.11

Molecular Formular = ?

The Formular relating these parameters is given as;

(Empirical Formula)n = Molecular Formular

where n = Number of moles

CH = 12.0107 + 1.00784 = 13.01854

(13.01854)n = 78.11

n = 78.11 / 13.01854

n = 5.9999 ≈ 6

Molecular Formula = C6H6

Answer:

C - 12.01 g/mol

H - 1.008 g/mol

CH - 13.018g/mol

molecular formula = n×(empirical formula)

       78.11 g/mol     = n ×( 12.01 + 1.008) g/mol

       ∴ n = 5.99

        ≈ 6

then

Explanation: First find the molar mass of the empirical formula CH.

use the formula that says: Molecular formula = n × empirical formula

therefore you divide the molar mass of the compound by molar mass of the empirical formula.

the empirical is the 6th and then multiply that 6 with the subscripts of CH.

MIDDLE SCHOOL

What type of temperature changes produce large crystals

Answers

Temperature has a clear effect on the growth rate of salt crystals. If you carry out an experiment with salt solutions, one at room temperature, one at a colder temperature and one at a warmer temperature, you see that the warm temperature sample grows crystals faster than both the other samples, and the room temperature sample grows faster than the cold sample. This is because a higher temperature increases the rate of evaporation of the solvent, thereby speeding up the rate of growth. Different temperatures produce different amounts of crystals. Colder solutions contract, forcing minerals closer together, so they create bonds, catching impurities in their structure at the same time. These impurities interrupt the crystal pattern, forming a larger number of smaller crystals. In warmer temperatures, the distance between molecules is greater, which allows crystals to form larger, purer shapes at a much more uniform rate than can occur at colder temperatures.
HIGH SCHOOL

Why are fracking liquid waste pools harmful to the environment? When fracking liquid waste is left in pools on the surface,__________
can evaporate into the air and contribute to pollution.

Answers

When fracking liquid waste is left in pools on the surface, toxic waste or toxic chemicals can evaporate into the air and contribute to pollution.

A recent study has revealed that the spills have left surface waters with heavy concentrations of radium, selenium, thallium, lead and other toxic chemicals. These, toxic and radio-active chemicals can continue remain there, for years, at unsafe levels. 
HIGH SCHOOL

_______A representative element in the fourth period that is an alkaline earth

Answers

Answer:calcium

Explanation: calcium is an alkaline earth metal,group 2 period 4

COLLEGE

Under which conditions would the solubility of a gas be greatest? high pressure and high temperature high pressure and low temperature low pressure and high temperature low pressure and low temperature

Answers

Answer:

high pressure and low temperature

Explanation:

Solubility of a gas is the amount of gas (concentration) that can be dissolved in a liquid.

Based on Henry's law, the solubility (C) of a gas is directly proportional to its pressure (P) above the liquid. i,e,

where kH = Henry's constant

Therefore, the solubility will increase with increase in pressure.

Lowering the temperature will lower the kinetic energy of the gas molecules and prevent them from escaping into the gas phase thereby increasing their solubility in water.

Answer:

high pressure and low temperature

Explanation:

Generally, solubility varies with temperature. In most substances, an increase in temperature causes an increase in solubility. That's why sugar dissolves better in hot coffee, and the chocolate bar must be dipped in hot milk to make a submarine.

The solubility of gases dissolved in liquids is different from that of solids. The solubility of a gas in water increases with the pressure of the gas on the solvent, if the pressure decreases, the solubility also decreases

The solubility of gases in liquids has a different behavior from that of solids. Both pressure and temperature have a strong influence on its solubility.

What is happening with the molecules? As the temperature rises, the energy of movement (kinetics) of the solute and solvent particles increases, thereby weakening the intermolecular forces. In this way, interactions between its particles and those of solvent are established, favoring the mixing.

In the case of gases, the decrease in intermolecular forces "releases" the gas molecules from the forces that keep them in solution and will escape from the container, so it will be observed that as the temperature increases, the solubility of a gas decreases in a solvent like water.

Gases dissolved in drinking water (mainly oxygen and nitrogen, the main components of the air) are responsible for the small bubbles that appear when the liquid heats up and has not yet reached the boiling point. That is, as it warms up, the molecules acquire enough kinetic energy to leave the liquid. When the water boils, it is completely degassed and a time is required for these gases to return to the liquid.

COLLEGE

Identify the compound that has polar bonds, but a dipole moment of 0. identify the compound that has polar bonds, but a dipole moment of 0. ar kf cf4 zn o2

Answers

CF4 is the compound that has polar bonds, but dipole moment of O. C-f bond is a polar bond which is covalent. It has dipole of 4 polar C.F bonds and results in the overall monopolar molecule.
CF4 it has no net dipole moment.

C- F  ( polar covalent bond)  

It has dipole of 4 polar C-F bond which cancel each other out

result as non polar dipole molecules

so CF4 has no net dipole moment.

COLLEGE

What are the net ionic equations for: Ni(No3)2(aq) + Na2S(aq) = NiS(s) + 2 NaNo3(aq)
KBr(aq) + NaNO3(aq) = KNO3(s) + NaBr(aq)
Li2SO4(aq) + BaCl2(aq) = BaSO4(s) + 2 LiCl(aq)

Answers

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a) The given balanced ionic equation is,

The ionic equation in separated aqueous solution will be,

In this equation, are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

(b) The given balanced ionic equation is,

The ionic equation in separated aqueous solution will be,

In this equation, are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

(c) The given balanced ionic equation is,

The ionic equation in separated aqueous solution will be,

In this equation, are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

1) Ni²⁺(aq) + S²⁻(aq) = NiS(s)

2) no

3) Ba²⁺(aq) + SO₄²⁻(aq) = BaSO₄(s)


HIGH SCHOOL

What level of secondary schooling is required to become a chemist?

Answers

It depends on what kind a chemist you mean . A pharmacist or working in an industrial chemical laboratory. Pharmacy requires a degree but to work in a lab y a laboratory assistant only requires  a GCSE in the UK

MIDDLE SCHOOL

What kind of decay cause neptunium -238 to form from uranium -238

Answers

After 30 years, about 4.7% of the americium atoms will have decayed to neptunium. Plutonium-239 is itself the primary fissile isotope of plutonium (used in nuclear weapons), and is in turn made from uranium.

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