what’s the answer??

Answer:

The answer is

[tex]4.92 \times {10}^{ - 22} \: J[/tex]

Explanation:

In order to find the energy of the wave we use the formula

where

e is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

f = 9.43 × 10¹¹ Hz

We have

[tex]e = 9.43 \times {10}^{11} \times 6.626 \times {10}^{ - 34} \\ [/tex]

We have the final answer as

[tex]4.92 \times {10}^{ - 22} \:J[/tex]

Hope this helps you

Answer:

Atomic size increase with increasing atomic number within a group.

Atomic size decrease with increasing atomic number across a period.

The statement, that describe the trends in atomic size, ionization energy, and electronegativity is "that atomic size decreases, ionization energy and electronegativity increases."

Atomic size seems to be the space between an atom's nucleus and its outermost shell.

The energy necessary to remove the highest-energy electron from a neutral atom is known as ionization energy (IE).

Electronegativity is a chemical property that describes an atom's or functional group's inclination to draw electrons toward itself. Across a period of elements, atomic size falls steadily from left to right. This is because all electrons within a period or family of elements are added to the same shell. Ionization energy generally increases across a period and declines down a group.

Electronegativity normally increases as you move from left to right across a period and decreases as you move down a group on the periodic table.

Hence the correct answer is atomic size decreases, ionization energy and electronegativity increases.

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Given parameters:

Heat of fusion of water  = 334j/g

Mass of ice  = 45g

Temperature of ice =  0.0°c

Unknown:

Amount of heat needed to melt = ?

Solution:

This is simply a phase change and a latent heat is required in this process.

  To solve this problem; use the mathematical expression below;

             H  = mL

where m is the mass

            L is the heat of fusion of water;

              H  = 45 x 334  = 15030J

In the redox reaction involving the permanganate ion in acidic solution, permanganate ion is reduced to manganese (ii) ion while iron (ii) ion is oxidized to iron(iii) ion.

A redox reaction is a reaction in which reduction and oxidation occurs at the same time and to the same extent.

An example of a redox reaction is the reaction involving the permanganate ion and tetraoxosulphate (vi) ion in acidic solution.

The equation of the reaction is given below:

[tex]MnO_{4}^{ - } (aq) + 5Fe^{2+}(aq) + 8H^{+} \rightarrow Mn^{2+}(aq)+ 5Fe^{3+}(aq) +4H_{2}O(l) \\ [/tex]

Therefore, in the redox reaction involving the permanganate ion in acidic solution, permanganate ion is reduced to manganese (ii) ion while iron (ii) ion is oxidized to iron(iii) ion.

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Answer:

This is a limitation of the kinetic-molecular theory.

Explanation:

Answer:

b solution

Explanation:

Explanation:

natural process

biological fixation

Answer:

Thermal Insulators

That's because air, like other gases, is a poor conductor of thermal energy. The particles of gases are relatively far apart, so they don't bump into each other or into other things as often as the more closely spaced particles of liquids or solids

Explanation:

Answer:Weathering Erosion & Deposition

Changes in shape, size, and texture of land-forms (i.e. mountains, riverbeds, and beaches)

Landslides.

Buildings, statues, and roads wearing away.

Soil formation.

Washes soil, pollutants, harmful sediments into waterways.

Causes metals to rust.

Reduces beaches, shorelines.

Delta formation.

Explanation:

Answer:

Amount = 0.0027 mol

Explanation:

The molecular formula of vitamin C is: C₆H₈O₆. Therefore, its molar mass will be:

Molar Mass = 6(Mass of carbon) + 8(Mass of Hydrogen) + 6 (Mass of Oxygen)

Molar Mass = 6(12 g/mol) + 8(1 g/mol) + 6(16 g/mol)

Molar Mass = 176 g/mol

Molar Mass = 176000 mg/mol

Now, for the amount of Vitamin C in 1 tablet

Amount = Mass of Tablet/Molar Mass

Amount = (475 mg)/(176000 mg/mol)

Amount = 0.0027 mol

Answer:

Enery transformation is when a forn of energy changes into another.

Explanation:

An example of this would be a lamp. The lamp gets its energy through electricity. This electricity is later turned into light energy. Electrical energy to light evegy.

Answer:

will i think the 21.0cm

Answer: Water as its the universal solvent

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity.

Explanation:

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.

Explanation:

Answer:

The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.

Answer:

a)

[SO2]: The concentration increases

[O2]: The concentration increases.

[SO3]: The concentration decreases.

b)

[SO2]: The concentration decreases.

[O2]: The concentration decreases.

[SO3]: The concentration increases.

c)

[SO2]:There is no change.

[O2]: There is no change.

[SO3]: There is no change

Explanation:

For an exothermic reaction, increase in temperature decreases the concentration of products and increases the concentration of reactants since increase in temperature shifts the equilibrium position to the left hand side.

Increase in pressure and decrease in volume will shift the equilibrium position towards the right hand side which means more SO3 in the system.

Catalyst increases the rate of forward and reverse reaction simultaneously hence at equilibrium, the concentration of reactants and products remain unchanged.

Answer:

Human activities are at the root of this phenomenon.

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 500 g

volume = 315 mL

We have

[tex]density = \frac{500}{315} = \frac{100}{63} \\ = 1.587301...[/tex]

We have the final answer as

Hope this helps you

Answer: I believe the answer is A

Answer:

Yes

Explanation:

It was Dmitri Mendeleev, a Russian chemist and teacher.

Answer:

No, it wasn't. On Feb.17 in 1869, a very intelligent Russian professor of chemistry, Dimitri Ivanovich Mendeleev created his first part of the periodic table. I hope that helps you.

Explanation:

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual mass = 35 g

error = 35 - 33.95 = 1.05

We have

[tex]p(\%) = \frac{1.05}{35} \times 100 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

O nome "transição" vem da posição dos elementos na tabela, representando a transição do grupo 2 ao 13, pela sucessiva adição de elétrons ao orbital d. Elementos de transição externa (ou somente elementos de transição):

Answer:

It's made from dairy.

Explanation:

Answer:

OD

Explanation:

they live in every habitat on Earth. Marine habitats, ocean basins, freshwater habitats, and inland equatic habitats including salt lakes.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 500 kg

volume = 0.026 m³

We have

[tex]density = \frac{500}{0.026} \\ = 19230.769230...[/tex]

We have the final answer as

Hope this helps you

Answer:

Um, I'd say add more types of plants cause different plants react differently to things, I guess?