a hydrogen atom in an excited state absorbs a photon of wavelength 1278 nm. what were the initial and final states of the hydrogen atom?

When the pressure of the helium gas is increased by 1.63 atm, while keeping the number of moles and temperature constant, its volume decreases to 45000 ml.

The relationship between the pressure, volume, and number of moles of a gas can be described by the Ideal Gas Law:

PV = nRT

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

When the pressure of a gas is increased, its volume will decrease. If the number of moles and temperature of the gas are kept constant, we can use the Ideal Gas Law to calculate the new volume of the gas. If the initial volume of the gas is V1 and the initial pressure is P1, and the final pressure is P2, then:

V2 = (nRT) / P2 = (nRT / P1) * (P1 / P2) = V1 * (P1 / P2)

Plugging in the values, we have:

V2 = 75 L * (0.58 atm / (0.58 + 1.63)) atm

V2 = 45 L

Converting liters to milliliters:

V2 = 45 L * 1000 ml/L = 45000 ml

So, when the pressure of the helium gas is increased by 1.63 atm, while keeping the number of moles and temperature constant, its volume decreases to 45000 ml.

Learn more about helium gas:

brainly.com/question/13645498

#SPJ4

A major problem that is thwarting efforts to clean up the air is: b. Lack of routine air quality monitoring in developing nations.

Air pollution is rising, common and dangerous effect seen in current scenario. The excessive usage of harmful equipments like vehicles, air conditioners, refrigerators and others leads to contamination of environment.

The inhalation of toxic gases leads to lung disorders and other bodily issues. It also has harmful effect on environment and animals. The improper air cleaning frequency has further lead to no change in worst scenario of air pollution.

Learn more about air pollution -

https://brainly.com/question/1187636

#SPJ4

Answer:

Acetic acid, systematically named ethanoic acid, is an acidic, colourless liquid and organic compound with the chemical formula CH₃COOH. Diluted, glacial acetic acid is used in preservation and canning of pickles and other vegetables. It is also used as a descaling agent for cleaning.

Explanation:

You would need roughly 202 ml of water to dissolve 72 grams of salt at 25 degrees Celsius.

The solubility of the compound, salt in water at 25 degrees Celsius is stated to be 357 grams per liter (g/L).

Then we can say that 357 grams of salt can be dissolved in 1 liter (1000 milliliters) of water.

To find out how much water you need to dissolve 72 grams of salt, solve the ratio as

357 g : 1000 mL = 72 g : x mL

Solving for x gives:

x = (72 g × 1000 mL) / 357 g

x = 201.681 mL

If we approximate this value it becomes 202ml

Find more exercises on dissolving compound;

https://brainly.com/question/22824409

#SPJ1

Answer:

= 2.23000 × 10-6

Explanation:

Explanation:

When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop.

When the temperature of a substance is increased, i.e., if you double the Kelvin temperature of a substance, you double the average kinetic energy of its molecules. When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases.

Answer:

gamma decay.

Explanation:

A gamma decay emits only a gamma-ray photon,

While a certain isotope decays, it emits photons.It is a type of gamma decay.

Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.

Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.

They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable

Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .

Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.

Learn more about isotopes,here:

https://brainly.com/question/11680817

#SPJ7

Answer:

Mass and speed

Explanation:

Mass and speed determine the amount of kinetic energy an object has. Mass is an intrinsic property of a body.

Mass refers to an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different elementary particles, theoretically with the same amount of matter, have nonetheless different masses.

Mass in modern physics has multiple definitions which are conceptually distinct, but physically equivalent. Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration when a net force is applied. The object's mass also determines the strength of its gravitational attraction to other bodies. The SI base unit of mass is the kilogram.

In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale.

Learn more about mass, here:

https://brainly.com/question/19694949

#SPJ6

Explanation:

Osmosis helps maintain homeostasis by maintaining concentration of solvents and solutes constant inside cells.

First reaction: Bi-211 (f) → Tl-207 (a) + α (i), where α is an alpha particle. Second reaction: Tl-207 (w) → Pb-207 (stable isotope) + β (z), where β is a beta particle.


In the first reaction, bismuth-211 (Bi-211) decays through alpha emission, producing thallium-207 (Tl-207) and an alpha particle (α). The equation is:
Bi-211 (f) → Tl-207 (a) + α (i)

In the second reaction, thallium-207 (Tl-207), which was produced in the first reaction, decays through beta emission to form a stable isotope, lead-207 (Pb-207), and a beta particle (β). The equation is:
Tl-207 (w) → Pb-207 (stable isotope) + β (z)
These two equations represent the nuclear reactions that occur as bismuth-211 decays to a stable isotope through both alpha and beta emissions.

Learn more about alpha particle here:

https://brainly.com/question/2288334

#SPJ11

Answer:

The awser is D.

If an object's mass is 70 g, and its volume is 10cm cubed,  its density is 7 centimeter cube.

The density of any solid substance is the unit of the area occupied by it in per centimeter of the cube of the volume in the given sample and calculated by dividing the mass and the volume of the compound unit will be centimeter cube.

The mass of the given object is 70 gram and the volume is given is 10 cm to find the density,

                       Density = mass of object / volume of object

substituting the value in the formula,

                 Density = 70 / 10

                 Density = 7 centimeter cube.

Therefore, the density of the given object will be 7 centimeter cube if  an object's mass is 70 g, and its volume is 10cm cubed.

Learn more about density, here:

https://brainly.com/question/15164682

#SPJ2

A Molecule is made up of two or more atoms (non-metal) which are chemically combined together. The Molecular formula of Water : H₂O; Hydrogen : H₂; Ammonia : NH₃; Sodium Chloride : NaCl;  Carbon dioxide : CO₂.

The particle that are very smaller and are found in an element or a  compound  is called as molecule. The molecules have the compound's or the element's chemical properties. Chemical bonds links the molecules to stay together. Atoms are the things that makes up the molecule.

The atoms that are present are similar in the molecule of an element. A molecule of a compound contains at least two types of atoms. For example let us consider a compound water. this contains hydrogen and oxygen. In water there will be 2 hydrogen and one oxygen atom. let us consider an example of the molecule of an element which is an oxygen. this contains two atoms but they both will be oxygen.

To know more about molecule here

https://brainly.com/question/14502751

#SPJ2

Due to the lack of supply of energy the methane could not change its phase before 2007.

Even though it has been summer since 2002, the lake didn't dry up until 2007. After 2007, the sun had given out enough energy for the methane molecules' kinetic energy to rise enough to outweigh their attraction to one another. The methane molecules in the lake were gaining kinetic energy at this moment, but the lake was still liquid. The temperature of the molecules remains constant while they melt because the average kinetic energy of the molecules does not vary.

To know more about kinetic energy, check out:

https://brainly.com/question/25959744

#SPJ1

An acetyl group is added to aniline to increase its solubility and stability, and then it is removed to restore the amine group in sulfanilamide.

The acetyl group (CH3CO-) contains a carbonyl group (C=O) bonded to a methyl group (CH3). This arrangement allows for resonance stabilization, where the π-electrons of the carbonyl group can delocalize and spread out over the adjacent atoms. Resonance contributes to stability by distributing the electron density and reducing localized charge buildup.

Additionally, the carbonyl group has electron-withdrawing properties. The oxygen atom in the carbonyl group is more electronegative than carbon, creating a polar bond. This polarization withdraws electron density from the carbon atom, making it less susceptible to nucleophilic attacks and oxidation.

The combination of these both effects makes the acetyl group more stable compared to a simple alkyl group.

The subsequent removal of the acetyl group is achieved by a process called hydrolysis. By treating acetanilide with an appropriate reagent, such as an acid or a base, the acetyl group is cleaved, regenerating the original amine group in sulfanilamide. This conversion is important because the amine group is often the reactive site in various biological and chemical processes.

Learn more about:Resonance stabilization

brainly.com/question/30490931

#SPJ11

Answer:

Forces acting on an object may be balanced or unbalanced. When the forces  acting on an object have equal strength and act in opposite directions, they  are balanced. These forces cancel out one another, and the motion of the  object does not change.  When the forces acting on an object are unbalanced, they do not cancel out  one another. An unbalanced force acting on an object results in the object’s  motion changing. The object may change its speed (speed up or slow down), or it may change its direction.  Friction is a force that resists the motion or the tendency toward motion  between two objects in contact with each other.  Gravity is a force that pulls objects toward one another. For example, Earth  pulls all objects toward it.

Explanation:

Answer:

Bats eat hundreds of mosquitoes and other annoying insects at night.

Answer:

Oxygen

Explanation:

Cellular respiration is the metabolic process that involves the breakdown of glucose molecule in order to synthesize energy in form of ATP. However, this cellular respiration can either be aerobic or anaerobic depending on whether oxygen is used or not.

Aerobic cellular respiration is the respiration that involves the use of OXYGEN. It occurs in the mitochondria of the cell, where oxygen is used as the final electron acceptor. Hence, according to the question, OXYGEN is used up during cellular respiration.

Answer:

Oxygen

Explanation:

got it on the test(:

Answer:

Kinetic energy has its determining factors and those are mass and speed or velocity

whereas the determining factors of potential energy are height, distance and mass.

EXAMPLE OF K.E

kinetic energy could be flowing water...

EXAMPLE OF P.E

potential energy is the water that is present at the top of the hill.

The answer C less active (or more noble) than hydrogen. This is because copper has a lower tendency to lose electrons and form cations compared to hydrogen. In other words, copper is a relatively stable element that is not as easily oxidized as hydrogen.

They can be seen in the electrochemical series, which ranks elements according to their tendency to undergo oxidation or reduction reactions. Hydrogen is located higher up on the series, indicating that it is more reactive and has a greater tendency to lose electrons and form cations. On the other hand, copper is located lower down on the series, indicating that it is less reactive and has a lower tendency to undergo oxidation. It is worth noting that copper can still undergo oxidation reactions under certain conditions. For example, when exposed to air and moisture, copper can slowly react to form copper oxide. Additionally, copper can be used as an anode in certain electrochemical cells, indicating that it is more anodic than some other metals. However, in general, copper is considered to be a relatively stable and unreactive element, particularly compared to hydrogen.

learn more about copper here.

https://brainly.com/question/13677872

#SPJ11

Answer:

1.35×10¹² μg

Explanation:

Mass (Kg) = 1350 Kg

Mass (μg) =?

Thus, we can obtain the mass of the adult rhino in micrograms (μg) by converting 1350 Kg to microgram (μg) as follow:

1 Kg = 1×10⁹ μg

Therefore,

1350 Kg = 1350 kg / 1 kg × 1×10⁹ μg

1350 Kg = 1.35×10¹² μg

Therefore, 1350 Kg is equivalent to 1.35×10¹² μg.

Answer:

To convert 1350 kilograms to micrograms, we need to multiply by a conversion factor that takes us from kilograms to micrograms.

1 kilogram = 1,000,000,000 micrograms (by definition)

So,

1350 kilograms = 1350 x 1,000,000,000 micrograms

= 1.35 x 10^12 micrograms (in scientific notation)

Therefore, the mass of an adult rhino is 1.35 x 10^12 micrograms.

Atomic structure influences the formation of compounds. The term “atomic structure” refers to the arrangement of an atom's electrons, protons, and neutrons. The three subatomic particles combine to create a stable, or unstable, nucleus. In the field of Engineering, scientists apply the principles of atomic structure to develop materials with different properties, such as high strength, durability, and flexibility.In the field of Medicine, doctors and researchers use the principles of atomic structure to develop new drugs and treatments for various diseases and illnesses.

Electrons orbit the nucleus in concentric shells with different energy levels, referred to as electron shells. When two or more atoms share electrons or when they exchange electrons, a compound is formed. For example, hydrogen and oxygen atoms combine to form water molecules, which are compounds that can be found in everyday life. Compound formation can be observed in daily life in many ways. The following are some examples:Water, salt, sugar, and other chemicals are used in the food we eat. Detergents, soaps, and household cleaners are used for cleaning purposes. Medicines and drugs are used for the treatment of various diseases. In the process of photosynthesis, plants use carbon dioxide to produce oxygen, which is an essential compound for human life. Similarly, atomic structure and compound formation can also be applied in different professions. In the field of Chemistry, researchers use the principles of atomic structure to develop new compounds and molecules that can be used for different purposes.In the field of Engineering, scientists apply the principles of atomic structure to develop materials with different properties, such as high strength, durability, and flexibility.In the field of Medicine, doctors and researchers use the principles of atomic structure to develop new drugs and treatments for various diseases and illnesses.

To know more about atomic structure visit:

https://brainly.com/question/14214017

#SPJ11

The given statement "Heat is not a measure of the ability of a substance to take in or give up heat" is false. . Heat is actually the energy transferred from one body or system to another due to a difference in temperature.

Heat can be thought of as a flow of energy from hotter to cooler objects, and it is measured in joules (J) or calories (cal). The ability of a substance to take in or give up heat is actually described by its specific heat capacity.

Specific heat is defined as the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius. Therefore, a substance with a high specific heat can take in or give up more heat energy than a substance with a low specific heat for the same change in temperature.

To know more about Heat:

https://brainly.com/question/998175

#SPJ4

Answer:

C. Pesticides protect our crops, but some European countries have

linked them to thyroid disorders.

Explanation:

Researches involving human or sometimes animals are subject to critical decision making.

They can easily trespass on the fundamental rights of people and some other issues.

Answer:

The correct answer is option b.

Explanation:

where [A]₀ is the initial concentration of reactant and k is the rate constant. Here half-life is proportional to 1/2_k_. Hence this option can be neglected.b) Half-life of a first-order reaction is as follows:t1/2=0.693kHere half-life is proportional to 1/k, hence this option is the correct choice.c) Half-life of a second-order reaction is as follows:t1/2=1k[A]0Here, the half-life is proportional to 1/k [A]₀. Hence this option can be neglected.d) This option can be neglected as (b) is the only correct choice.

The difference between an orbit and an electron cloud is that an orbit is an area around the nucleus, whereas an electron cloud is a visual representation of where negative charge electrons are most likely present.

An area where an electron is very likely to be is called the electron cloud. The electron cloud is a tool for modelling the atom and is used to describe the behaviour of electrons. The location in space where an electron is most likely to be can be seen in the electron cloud. According to the electron cloud model, although we can never be certain of an electron's precise location, it is more likely that they are in certain regions.

Orbitals are those regions with a thick electron cloud where there is a high probability of finding an electron. Bohr put forth an orbital model. According to the orbital model, the negative electron orbit the astral nucleus in a ringlike pattern with the closest orbit to the nucleus having the lowest energy level. The electrons in this model can only be in very fixed fixed orbits, ruling out all other possibilities.

Learn more about electron here:

https://brainly.com/question/1255220

#SPJ4

Answer:

A balanced equation is a chemical equation where there are equal numbers of atoms of each element on both sides of the equation.

A chemical equation that has a equal amount of each

each element on the left and right sides

To increase the amount of light that a device is converting, you can optimize the photovoltaic material and the surface area.

The choice of photovoltaic material plays a crucial role in light conversion. Research and development efforts focus on enhancing the efficiency of existing materials or discovering new materials with better light absorption and conversion properties.

When you increase the surface area of the device exposed to light, it can enhance light absorption. This can be achieved through design modifications that trap or scatter light, or by using materials with a higher surface area-to-volume ratio.

Learn more about light here:

https://brainly.com/question/104425

#SPJ1

Answer:

The large the atomic radius the more the metallic character of elements

Explanation:

The atomic radius is related to the metallic character in a way that the larger the atomic radius, the more metallic a body becomes.

Therefore, as we go down a group, metallic character increases.