Suppose pure-wavelength light falls on a diffraction grating. What happens to the interference pattern if the same light falls on a grating that has more lines per centimeter

Answer:

B

Explanation:

it is the only logical answer that would give you (5x104 / 2.5x102)

Answer:fluorine

Explanation:

Based on location in the periodic table, fluorine (F) has chemical properties that are most similar to iodine.

In the periodic table, elements are classified in groups and periods. The elements in the same group are chemically similar and they have the same number of valence electrons. Elements in the same period have the same highest energy level.

Hence, when looking for an element that is most chemically similar to iodine, we have to consider the element that is in the same group with iodine.

Both fluorine are iodine are both in group 17 hence, fluorine is most chemically similar to iodine.

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Answer:

The correct option is;

New technology showed how to identify one of the elements

Explanation:

The unexpected discovery of argon, which is one of the inert gases, by Lord Rayleigh in 1892, when he observed while attempting to determine more reliable atomic weights by carrying out gas density measurements through experiments that yielded more exact results, that the density of nitrogen obtained from the atmosphere was different from that from pure ammonia

The suspected gas which was the cause of the observation was isolated by removing all the other known gases in the air and with the aid of its emission spectra, which was a new technique of distinguishing materials, metals and gases, William Ramsay was able to show that it was a new chemical species.

Answer:it’s b

Explanation:

Answer:

I need an image to help you as best as I can. Hopefully, this gets your attention so I can try to help!

Explanation:

Answer:

The mass number of an atom.

Answer:

Why does the Moon have phases?

At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

The Moon has phases because it orbits Earth, which causes the portion we see illuminated to change. The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 days. The Moon spends the extra 2.2 days "catching up" because Earth travels about 45 million miles around the Sun during the time the Moon completes one orbit around Earth.

At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

You can create a mockup of the relationship between Sun, Earth, and Moon using a bright lamp, a basketball, and a baseball. Mark a spot on the basketball, which represents you as an observer on Earth, then play with various alignments of Earth and Moon in the light of your imaginary Sun.

When is the Harvest Moon?

The full Moon that occurs closest to the autumnal equinox is commonly referred to as the "Harvest Moon," since its bright presence in the night sky allows farmers to work longer into the fall night, reaping the rewards of their spring and summer labors. Because the equinox always falls in late September, it is generally a full Moon in September which is given this name, although in some years the full Moon of early October earns the "harvest" designation.

Why do we always see the same side of the Moon from Earth?

The Moon always shows us the same face because Earth's gravity has slowed down the Moon's rotational speed. The Moon takes as much time to rotate once on its axis as it takes to complete one orbit of Earth. (Both are about 27.3 Earth days.) In other words, the Moon rotates enough each day to compensate for the angle it sweeps out in its orbit around Earth.

Gravitational forces between Earth and the Moon drain the pair of their rotational energy. We see the effect of the Moon in the ocean tides. Likewise, Earth's gravity creates a detectable bulge -- a 60-foot land tide -- on the Moon. Eons from now, the same sides of Earth and Moon may forever face each other, as if dancing hand in hand, though the Sun may balloon into a red giant, destroying Earth and the Moon, before this happens.

When does the young Moon first become visible in the evening sky?

There is no real formula for determining the visibility of the young Moon. It depends on several factors: the angle of the ecliptic (the Moon's path across the sky) with respect to the horizon, the clarity of the sky (how much dust and pollution gunks it up), and even the keenness of the observer's eyesight.

The young Moon becomes visible to the unaided eye much earlier at times when the ecliptic is perpendicular to the horizon, and the Moon pops straight up into the sky. In these cases, it may be possible to see the Moon as little as 24 hours after it was new, although every hour beyond that greatly increases the chances of spotting it. When the ecliptic is at a low angle to the horizon, and the Moon moves almost parallel to the horizon as it rises, the Moon probably doesn't become visible until at least 36 hours past new.

The record for the earliest claimed sighting of the young crescent Moon is around 19 hours, although most experts are suspicious of any claims of times less than about 24 hours.

Explanation:

a. Consistency is a term that matches the description: The agreement between several measurements of the same quantity.

b. Density matches the description: Ratio between the mass and volume of a substance.

c. Outlier matches the description: In a series of measurements of the same quantity, one that is significantly different from the others.

d. Mean matches the description: Mathematical value reported when a quantity is measured multiple times.e. Immiscible is a term describing two liquids that do not mix together.

Definition: Immiscibility is the property of not being miscible. When two or more liquids are not able to form a homogeneous solution when combined, they are immiscible. The term "miscible" refers to the property of being mixed. Therefore, immiscible liquids cannot be mixed together or dissolved in one another.

Limiting reagent (also known as limiting reactant) is a chemical reaction term that refers to the substance that limits the quantity of product that can be formed in a chemical reaction. It is the substance that is entirely consumed first, preventing the other reactants from reacting further. The amount of product generated is determined by the quantity of the limiting reagent. In a chemical reaction, the quantity of the product produced is determined by the limiting reactant, and the rest of the excess reagents will remain unchanged.

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The mixture that cannot produce an effective buffer solution is NaOH and NaF. Therefore, option (E) is correct.

To determine which mixture cannot produce an effective buffer solution, we need to consider the components of a buffer system. A buffer solution requires a weak acid and its conjugate base (or a weak base and its conjugate acid) in approximately equal amounts.

a. HCl and NaH₂PO₄: HCl is a strong acid, and NaH₂PO₄ is a weak acid. Both components are acids and cannot form a buffer solution.

b. Na₂HPO₄ and Na₃PO₄: Na₂HPO₄ is a weak acid, and Na₃PO₄ is its conjugate base. These components can potentially form a buffer solution.

c. NaHCO₃ and Na₂CO₃: NaHCO₃ is a weak acid (bicarbonate), and Na₂CO₃ is its conjugate base (carbonate). These components can form a buffer solution.

d. NaH₂PO₄ and Na₂HPO₄: NaH₂PO₄ is a weak acid (dihydrogen phosphate), and Na₂HPO₄ is its conjugate base (monohydrogen phosphate). These components can form a buffer solution.

e. NaOH and NaF: NaOH is a strong base, and NaF is a salt. Both components are not weak acids or their conjugate bases and cannot form a buffer solution

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The equilibrium state of a biochemical reaction is approached more rapidly in the presence of a catalyst.

Aldehyde is created in the Rosenmund reaction by reducing acid halides with hydrogen gas while palladium is present. If a catalyst is not poisoned, the reaction does not halt at the aldehyde level, which is an alcohol feather reducer. to halt at the aldehyde level. Barium sulfate contaminates palladium.

The catalyst and the reaction are in separate states of matter in heterogeneous catalysis. 

1) Adsorption of reactant molecules activation center is the key phase in this process.

2) The center forms an activation complex.

3)The complex breaks down into products.

4) Product desorption from the catalyst's surface.

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Answer:

a pH above 7 is alkali

a pH lower than 7 is acidic

Answer:

D. It is limited to situations that involve aqueous solutions or specific compounds.

Explanation:

It is the only interpretation that involves specifically aqueous solutions.

The statement that describe Arrhneius interpretation of acids and bases is It is limited to situations that involve aqueous solutions or specific compounds.

Svante Arrhenius a swedish scientist formulated a theory about acid and bases in 1884 based on theory of ionization. Arrhenius stated that acids contains hydrogen ions and when its dissociates in water will give out H+ ions and base is an hydroxide substances that will produce OH− ions on when it dissociates in water.

Therefore, The statement that describe Arrhneius interpretation of acids and bases is It is limited to situations that involve aqueous solutions or specific compounds.

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Answer:

Mass of butane = 1.87 g

Explanation:

Form a balanced chemical equation for the reaction stated:

C₄H₁₀ + 13/2 O₂ → 4CO₂ + 5H₂O

Number of moles of CO₂

\( = \frac{mass}{molar \: mass} \)

\( = \frac{15}{12 + 2(16)} \)

\( = 0.34 \: mol\)

From the equation,

1 mol C₄H₁₀ : 4 mol CO₂

0.085 mol C₄H₁₀ : 0.34 mol CO₂

Mass of butane

\( = number \: of \: moles \times molar \: mass\)

\( = 0.085 \times (12 + 10(1))\)

\( = 1.87 \: g\)

The grams of butane must be burned in an excess of Oxygen, to produce 15g of CO₂ is 1.87 grams.

Relation between mass and moles will be represented as:

n = W/M, where

W = require or given mass

M = molar mass

Given balance chemical reaction is:

C₄H₁₀ + 13/2O₂ → 4CO₂ + 5H₂O

Moles of 15g of CO₂ = 15g / 44g/mol = 0.34 moles

From the stoichiometry of the reaction, it is clear that:

4 moles of CO₂ = produced by 1 mole of C₄H₁₀

0.34 moles of CO₂ = produced by 1/4×0.34=0.085 moles of C₄H₁₀

Now we convert moles of butane to mass as:

W = (0.085)(22) = 1.87 g

Hence required mass of butane is 1.87 grams.

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1A.matter can neither be created nor be destroyed

6.balencing equation steps:--

balencing other than hydrogen nd oxygen

balencing oxygen

balencing hydrogen

balencing charge

In scientific notation, "significant figures" refers to the significant single digits (0 to 9, inclusive) of the coefficient of expression.

A significant figure in a given number is made up of all the certain digits plus one uncertain digit. They are reliant on the scale's or measurement tool's accuracy.

1. 587 is an example of four important digits (three are certain and one is doubtful).

On solving above problem we get,

3.7 + 5.894 + 782.52

9.594 + 782.52

792.114

792.1

The answer of the above problem is 792.1.

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Answer:

1 A

3 main types of bond are

Ionic bond ( formed due to complete transfer of electron between atoms(

Covalent bond ( formed by mutual sharing of electron)

Metalic bond ( present in the metals due to mobile electrons)

1 B bond in CaO is ionic bond formation in attached image

1 C hydrogen bond with nitrogen is covelent NH3 ammonia is formed because a bond between two non metals is expected to be covalent

More their electronegativity difference between hydrogen and nitrogen is less than 1.7 that makes it covalent

Explanation:

Answer: This looks tough

Explanation:

Five waves measure 25 cm and pass a point in 1 s then the wavelength is 5cm the frequency is 5Hz and the period is 5 s

Here given data is

Five waves measure 25 cm and pass a point in 1 s

So, the wavelength = λ = v/f

Wavelength =  25 cm/5 waves

Wavelength = 5cm

Frequency = 1/T

Frequency = 1/5 = 5Hz

Period = 1/frequency

Period = 1/5 = 5 s

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Answer:

1.2 cm^3

Explanation:

5.74 grams of a something occupies a volume of 1.2 cm^3 .

Activation Energy

The types of energy that are involved in a chemical reaction are : (A) Activation Energy and (B) Chemical Energy. - The energy required for a chemical reaction to take place is known as the activation energy. - If the energy is less than the activation energy, the reaction will not take place.

Answer:

im an idiot but  i think its A

if im wrong im so sorry

Explanation:

To oxidize 10 g of cyclohexanol, 200 mL of 5.0% w/v bleach (NaOCl) is needed.

Before calculating the volume of bleach, we need to find:

\(Mass of cyclohexanol = 10 g\\Concentration of bleach (NaOCl) = 5.0\% w/v\\Convert the mass of cyclohexanol to moles.\\Molar mass of cyclohexanol (C6H12O) = 100.16 g/mol\\Moles of cyclohexanol = mass / molar mass\\Moles of cyclohexanol = 10 g / 100.16 g/mol\)

Determine the stoichiometry between cyclohexanol and bleach.

From the balanced equation for the oxidation of cyclohexanol, we know that:

1 mole of cyclohexanol reacts with 1 mole of bleach (NaOCl)

Calculate the moles of bleach required.

\(Moles\ of\ bleach\ (NaOCl) = moles\ of\ cyclohexanol\)

Calculate the volume of bleach using its concentration.

\(Volume\ (in\ mL) of\ bleach = (moles\ of\ bleach / concentration\ of\ bleach) * 1000\\Volume (in mL) of bleach = (moles of bleach / 0.05) * 1000\\Substituting the value of moles of bleach\\Volume (in mL) of bleach = (moles of cyclohexanol / 0.05) * 1000\\Substituting the value of moles of cyclohexanol\\Volume (in mL) of bleach = (10 g / 100.16 g/mol) / 0.05 * 1000\)

Simplifying:

\(Volume\ (in\ mL)\ of\ bleach = 199.64\ mL\)

Therefore, to oxidize 10 g of cyclohexanol, you would need approximately 200 mL of 5.0% w/v bleach (NaOCl).

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To answer if a salt is formed between the reaction of a base and an acid, we need to remember that, if we react a strong acid and a strong base, such as HCl and NaOH, two products will be formed: the appropriate salt and water.

In the example above, we can write the reaction as:

HCl + NaOH -> NaCl + H2O

where a strong acid and a strong base react to form a salt (NaCl) and water (H2O).

Thus, we can say that, yes, a salt is formed when an acid and a base react between each other.

Answer:

study a larger sample size than before.

Explanation:

Science is evolving day by day and every new experiment is contradict the old experiment, giving new theories.

The advancement in the technology modifying the new experimental methods and it can change a theory if study a larger sample size than before. It is so because new experiment verify and validates larger sample size and evidences can contradict the old theory. Large sample size means more experiments and more validations.

Hence, the correct answer is "study a larger sample size than before."

Answer: is the D

Explanation:

The equation for the reaction of iron (iii) phosphate with sodium sulfate to make iron (iii) sulfate and sodium phosphate is 2 FePO₄ + 3 Na₂SO₄ ⇒ Fe₂(SO4)₃ + 2 Na₃PO₄.

Each atom on both sides of a balanced chemical equation has the same number and type. A balanced equation's coefficients must have the simplest whole number ratio. In chemical reactions, mass is always conserved.

2 FePO₄ + 3 Na₂SO₄ ⇒ Fe₂(SO4)₃ + 2 Na₃PO₄ this is a balanced chemical equation for iron (iii) phosphate with sodium sulfate to make iron (iii) sulfate and sodium phosphate.

Thus, the reaction is 2 FePO₄ + 3 Na₂SO₄ ⇒ Fe₂(SO4)₃ + 2 Na₃PO₄.

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One example of particles that can be drawn closer to occupy a smaller volume is a gas.

In the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.

Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.

By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.

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Answer: True

Explanation:

Radiation produced in the given reaction is beta and gamma.

Radiation is defined as a source of energy or particles that pass through the atmosphere or other media. Radiation includes microwaves and radio waves utilized for wireless communication as well as light and heat. The term "radiation" refers to energetic particles and electromagnetic waves that some materials emit.

A stream of extremely energetic electromagnetic radiation known as gamma rays or gamma radiation is released by an atomic nucleus that is going through radioactive decay.

Beta Radiation Free electrons or positrons moving at relativistic speeds make up beta radiation. The term "beta particles" refers to these entities. Beta particles are high-energy, high-speed electrons or positrons released by some fission fragments or by some primitive radioactive nuclei, such as potassium-40.

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Answer:

"Symbolic representation of a chemical reaction in the form of symbols and formulae"

Answer:

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulas.

Explanation:

Example- Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as: Zn+H2SO4→ZnSO4+H2.

The correct statement is: d. An electron has properties of a particle and a wave in this wave mechanical model of the atom.

In the wave mechanical model, developed by de Broglie and Schrödinger in the 1920s, the following statements are true:

d. An electron has properties of a particle and a wave in this wave mechanical model of the atom.

This statement is correct. The wave mechanical model of the atom describes electrons as having both particle-like and wave-like properties. The model introduces the concept of wavefunctions, which are mathematical functions that describe the probability distribution of finding an electron at different locations around the nucleus. This wave-like nature of electrons is known as wave-particle duality.

a. The position of an electron can be exactly found and measured.

This statement is false. According to the Heisenberg uncertainty principle, it is impossible to precisely determine both the position and momentum of a particle simultaneously. In quantum mechanics, the position of an electron can only be described in terms of a probability distribution given by its wavefunction.

b. With the use of modern instruments, scientists can watch an electron move from point to point in its orbit.

This statement is false. Directly observing the movement of an electron in its orbit is not possible due to the limitations imposed by the uncertainty principle. The position and momentum of an electron cannot be simultaneously known with certainty.

c. Energy levels in quantum mechanics are not limited to certain discrete values but are actually continuous.

This statement is false. In quantum mechanics, energy levels are indeed limited to certain discrete values. Electrons in an atom can only occupy specific energy levels or orbitals, and the energy transitions between these levels give rise to the characteristic emission and absorption spectra observed in atomic systems.

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