A certain shade of blue has a frequency of 7.26 × 1014 Hz. What is the energy of exactly one photon of this light?

Answer : The [tex]\angle 3\text{ and }\angle 4[/tex] are, supplementary angles.

Explanation :

Supplementary angles  : The two angles are supplementary angle in whcih the the sum of those two angle are [tex]180^o[/tex]

Complementary angles  : The two angles are complementary angle in whcih the the sum of those two angle are [tex]90^o[/tex]

Vertical angles  : Vertical angles are the angles that are opposite to each other when two lines intersect each other.

Congruent angle : It is defined as they have the same angles.

From the above information we conclude that,

[tex]\angle 1\text{ and }\angle 2[/tex], [tex]\angle 2\text{ and }\angle 3[/tex], [tex]\angle 3\text{ and }\angle 4[/tex] and [tex]\angle 4\text{ and }\angle 1[/tex] are the supplementary angles.

[tex]\angle 1\text{ and }\angle 3[/tex] and [tex]\angle 2\text{ and }\angle 4[/tex] are the vertical angles.

Hence, the [tex]\angle 3\text{ and }\angle 4[/tex] are, supplementary angles.

the answer is true. Each element has it's own emission bright line spectrum pattern

To calculate the number of atoms in 5.40g of Boron, we first convert grams to moles using Boron's atomic weight, resulting in 0.5 moles. Then, using Avogadro's number (6.022 x 10²³ atoms/mole), we can find the number of atoms. Hence, 5.40g of Boron contains approximately 3.011 x 10²³ atoms.

The number of atoms in 5.40g of Boron (B) can be found by first determining the number of moles. Boron's atomic weight is approximately 10.81 g/mol. Therefore, 5.40g of Boron would consist of 0.5 moles.

Next, using Avogadro's number (approximately 6.022 x 10²³atoms/mole), used to convert moles to atoms, we can find out the number of atoms.

Therefore, 5.40g of Boron contains approx 3.011 x 10^23 atoms.

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Answer:

45 electrons.

Explanation:

mass number = 80

no. of neutrons = 35

Given that it is a neutrally charged atom,

no. of electrons = mass no. - no. of neutrons

                          =    80 - 35

                          =      45 electrons.

The electrons in bonds (bonding domains) differ from lone pairs (non-bonding domains) is because the bonding domains are bonded to the central atom vs the lone pairs are just stuck on as extra electrons. The difference of bonding domains from non-bonding domains is that the bonding domains are bonded to the central atom and the non-bonding domains are just stuck on as extra electrons.

Answer:

The bonding electrons are different from nonbonding electrons by the arrangement with the central atom. Bonding electrons are bonded with the central atom. Nonbonding electrons appear are electron clouds.

Explanation:

During the formation of a chemical bond, there are bonding electrons and loan pairs.

The electrons of both the atom in a chemical bond share with each other and form a stable sigma bond. The electrons are linearly bonded with each other.

The electrons which are not directly bonded with other atoms, occupy the space at the top and bottom of the sigma bond. These electrons are present as the electron cloud and are termed the non-bonding electrons.

The bonding electrons differ from non-bonding electrons as bonding electrons are bounded by the central atom. Loan pair of electrons or nonbonding electrons are present as the electron cloud above or below the bond.

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the correct answer is 2,3,4,6, and 7

Answer:

the states of the reactants and products

the temperature and pressure at which the reaction was carried out

the relative amounts of reactants and products

the type of catalyst that is used to speed up the reaction

whether the reaction can go in both directions

2, 3, 4, 6, 7 / B, C, D, F, G

The molar mass of PCl5 is 208.24 g/mol. So calculating for the number of moles:

moles PCl5 = 280 / 208.24

moles PCl5 = 1.34 mol

From the equation, 67 kJ of heat is absorbed for every 1 mole hence:

total heat = 67 kJ / mol * 1.34 mol

total heat = 90 kJ

Answer is: No. Salt, like all matter is composed of atoms.

For example, table salt is sodium chloride mixed with small amount of potassium iodide (KI), sodium iodide (NaI) or sodium iodate (NaIO₃).

Atomic level - sodium chloride (NaCl) has crystal cubic structure (lattice-type arrangement) with ionic bonds. Sodium is cation with charge 1+ and chlorine is an anion with charge 1-.

Macroscopic level - table salt is colorless crystal, soluble in water with high melting and boiling temperature.

The statements that describe metalloids are these are elements that have both metal and nonmetal properties. The correct option is A.

Metalloids are chemical elements that have the properties of both metals and non-metals. Metalloids are brittle and good conductors of electricity. They form alloys with metals. They have various chemical and physical properties that are used in many things like catalysis, flame, or glasses.

So, metalloids are elements that contain both metals and non-metals. They are not the metals that don't lose. They always do not attract electrons and only metal properties are also wrong because it has the properties of both.

Thus, the correct option is A. Metalloids are elements that have both metal and nonmetal properties.

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Answer:

H2

Explanation:

The 2 in this equation is supposed to be little.

Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.

The electron shell of an atom contains electrons, negatively charged subatomic particles. Protons and neutrons, the other subatomic particles, reside in the atom's nucleus.

The electron shell of an atom contains one type of subatomic particle known as the electron. Electrons are very small particles with a negative charge, often represented by 'e⁻' in scientific notation. In contrast, two other subatomic particles, the proton and neutron, are located in the nucleus of the atom. Protons have a positive charge and are denoted by 'p⁺', while neutrons have no charge and are represented by 'n' or 'n⁰'. The combination of electrons, protons, and neutrons constitutes the fundamental architectural makeup of an atom, determining its element, isotopes, and chemical behavior.

Rutherford deduced that an atom is mostly empty space because most alpha particles in his experiment passed through the gold foil unabated; only a few particles deflected due to the presence of a small, dense, positively charged nucleus.

Rutherford concluded that the atom was mostly empty space based on his gold foil experiment. He observed that the vast majority of the alpha particles passed through the gold foil without deflection, indicating that they encountered no significant obstacle, hence most of the atom was empty space. A very small number of alpha particles were deflected at large angles, and even fewer were deflected straight back, which suggested that they interacted with something very small and with a substantial positive charge and mass. This led Rutherford to propose the nucleus, a tiny, dense center within the atom composed of protons and neutrons. He surmised that the electrons orbit this nucleus, much like planets around the sun, in what is known as the planetary model of the atom.

Among the following, Li will form Catian due to its high probability of donating electron as it have low ionization enthalpy.

The ionization enthalpy of an element can be defined as the amount of energy required to remove an electron from an isolated gaseous atom in its gaseous state.

Among th given options ;

Ne is an inert gas element i.e, inactive element and has complete outermost orbit thus no need to accept or donate electron.

Li will form Catian due to its high probability of donating electron as it have low ionization enthalpy.

O has stable outermost orbital and thus no need to accept or donate electron.

I is the least reactive element and comparatively high ionization enthalpy.

Hence, Among the following, Li will form Catian due to its high probability of donating electron as it have low ionization enthalpy.

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In the given question, [tex]\rm MgBr_2[/tex] is an ionic bond. The correct answer is option 2.

A covalent bond is a type of chemical bond in which two atoms share one or more pairs of electrons.

Ionic bonds is formed between a metal and a nonmetal, where one atom gives up an electron to another atom. In [tex]\rm MgBr_2[/tex], magnesium (Mg) is a metal and bromine (Br) is a nonmetal. Magnesium gives up two electrons to bromine, forming an ionic bond.

Therefore, option 2. ionic bond is the correct answer.

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Answer:

For 10: The correct answer is Option c.

For 11: The correct answer is Option b.

Explanation:

There are 3 states of matter:

Solid state: In this state, the particles are closely packed and does not have any space between them. Thus, this state of matter has the highest intermolecular forces of attraction.

This state have a definite shape and volume.

Liquid state: In this state, the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. The intermolecular forces between the particles are less as compared to the solid state.

This state have a definite volume but does not have a fixed shape as they can take up the shape of container in which they are kept.

Gaseous state: In this state, the particles are loosely arranged and have a lot of space between them. Thus, this state of matter has the lowest intermolecular forces of attraction.

This state have indefinite volume as well as shape. It can take up the volume and shape of the container in which they are kept.

From the above information:

For 10: The state of matter which takes up the shape and volume of the container is gaseous state.

Hence, the correct answer is Option c.

For 11: The state of matter which has indefinite shape but have a definite volume is liquid state.

Hence, the correct answer is Option b

A gas takes both the shape and volume of its container, while a liquid has a definite volume but takes the shape of its container. A solid does not conform to the container's shape or volume.

States of matter are characterized by their ability to take the shape and volume of their containers. The state of matter that takes both the shape and volume of its container is the gas state. This is because the particles in a gas are spread out and can move freely to fill any space available. On the other hand, a liquid has a definite volume but takes the shape of its container. Conversely, a solid does not change to fit the shape or volume of its container as its particles are tightly packed and only vibrate in place.

Which state of matter takes both the shape and volume of its container?

The answer is gas (c), as gases will expand to fill the entire volume of their container and take its shape.

Which state of matter is characterized by having an indefinite shape but a definite volume?

The answer is liquid (b). Liquids have a fixed volume but will flow and change their shape to conform to the shape of their container, without changing volume.

Answer: adaptation

natural selection

Natural selection refers to the differential survival of the organisms in the population. It describe the fact that individual that have favorable phenotypic characteristics have better chances of survival over others in the changing environment. Adaptation is a genetic change or mutation that helps organism to survive in it's ecological niche. Due to the helpful nature of these genetic changes they are passed down from one generation to the next generation and favors the survival and abundance of a species.

Adaptation and natural selection has resulted in the change in the population of the giraffes. The giraffes being in short neck adapted the increase in neck length with an effort to obtain leaves from tall tries. The long neck giraffe got the better chances of survival and reproduction, due to natural selection the trait was passed on to generation. This resulted in the evolution of long neck giraffe species.

The temperatures of three substances in order from greatest to least is

This is the degree of hotness or coldness of a substance. It is also the

average kinetic energy present in a body.

Higher temperatures usually have the highest average kinetic energy.

Gases have the highest kinetic energy while Solids have the least kinetic

energy. In the case of Water, the gaseous form is Water vapor and the

solid form is Ice.

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Answer:pookie dookie

Explanation:

Among the given substances, Ammonia, a compound, can be decomposed into Nitrogen and Hydrogen by a chemical change.

The substance that can be decomposed by a chemical change among Sodium, Argon, Sulfur, and Ammonia is Ammonia. In a chemical change, one or more substances are converted into different substances. In this context, Sodium, Argon, and Sulfur are elements that exist in their most simplified form and cannot be broken further down by chemical change. On the other hand, Ammonia (NH3) is a compound and can be decomposed into Nitrogen and Hydrogen via chemical changes.

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Mercury is the answer

Tin -118 is the isotope with 50 protons, 68 neutrons, and 50 electrons.

Isotopes can be described as elements that contain the same atomic number but a different atomic mass. Isotopes of an element possess an equal number of electrons and protons. The number of neutrons in the respective nucleus of that element is different.

For example, the isotope of oxygen can be written as oxygen- 16, oxygen - 17, and oxygen-18 as all of them contain eight electrons or protons.

Tin metal has 29 isotopes but all the isotopes have the same number of electrons and protons. Among these only ¹²⁶Sn isotope is long-lived while the rest 28 isotopes of tin with a half-life of less than one year. The mass number of the given isotope of tin = 50 + 68 = 118. Therefore, the given isotope of tin is ¹¹⁸Sn. It has an abundance of 24.22%.

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1. Speed, since we know that [tex]s=\frac{d}{t}[/tex], where s is speed, d is distance and t is time

2. Velocity, for velocity you need to consider the direction and displacement gives the direction of travel.

3. 25 mph, because [tex]s=\frac{d}{t} =\frac{50}{2} =25mph[/tex]

4. 50 mph east, velocity unlike speed has direction.

5.Velocity, displacement gives the formula  [tex] v=\frac{d}{t}[/tex] direction.

6. 0, the displacement is zero so velocity is zero

7.  It decreases, speed is inversely proportional to time

Answer:

They have the same number of valence electrons.