can somebody give me the answer to this ?

Answer:

6.56×10¹⁴ Hz

Explanation:

From the question given above, the following data were obtained:

Wavelength = 457 nm

Frequency =?

Next, we shall convert 457 nm to metre (m). This can be obtained as follow:

1 nm = 1×10¯⁹ m

Therefore,

457 nm = 457 nm × 1×10¯⁹ m / 1 nm

457 nm = 4.57×10¯⁷ m

Thus, 457 nm is equivalent to 4.57×10¯⁷ m

Finally, we shall determine the frequency of the blue light as follow:

Wavelength = 4.57×10¯⁷ m

Velocity of light = 3×10⁸ m/s

Frequency =?

Velocity = wavelength x frequency

3×10⁸ = 4.57×10¯⁷ × frequency

Divide both side by 4.57×10¯⁷

frequency = 3×10⁸ / 4.57×10¯⁷

frequency = 6.56×10¹⁴ Hz

Therefore, the frequency of the blue light is 6.56×10¹⁴ Hz

Answer:

Barium chloride + Sodium phosphate    →   barium phosphate + sodium chloride

Explanation:

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD

Chemical equation:

BaCl₂ + Na₃PO₄         →     Ba₃(PO₄)₂ + NaCl

Balanced chemical equation:

3BaCl₂ + 2Na₃PO₄         →     Ba₃(PO₄)₂ + 6NaCl

The cation and anion of both reactants are exchanged with each other.

Ba²⁺ react with PO₄³⁻ and form Ba₃(PO₄)₂ while Cl⁻ react with Na⁺ and form sodium chloride.  

Molecular equation:

Barium chloride + Sodium phosphate    →   barium phosphate + sodium chloride

Answer:

The answer is 2.31×10^12

Explanation:

(4.2×10^9)(5.5×10^2)

(4.2×5.5)×(10^9×10^2)

23.1×10^9+2

23.1×10^11

Answer:2.31×10^12

Answer:

4

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

Al₂(SO₃)₃ - Aluminum Sulfide

2Al₂(SO₃)₃

Step 2: Identify

In Aluminum Sulfide, we have 2 Al's for every 3 SO₃²⁻'s.

So far, we have 2 Al's in total.

BUT, since we have a 2 coefficient in 2Al₂(SO₃)₃, we need to multiply by 2.

Therefore, we have 4 Al's in total.

Answer:

The correct answer is 82.18%.

Explanation:

Based on the given information, the mass of the pure soluble bromide compound is 0.4708 grams, and the mass of the formed silver bromide is found to be 0.9093 grams.

The molecular weight of AgBr is 187.77 g/mol, and the molecular weight of Br is 79.9 g/mol.

So, 0.9093 grams of AgBr comprise (79.9 * 0.9093)/187.77 = 0.3869 grams of bromine.

Now, 0.4708 grams of sample comprise 0.3869 grams of bromine. Therefore, 100 grams of sample comprise (0.3869*100) / 0.4708 g = 82.18 grams of bromine.

The mass % of bromine in the original compound is 82.18%.

Answer:

When fossil fuels are burned carbon and hydrogen react with oxygen in air to carbon dioxide (CO2) and water (H2O). During this reaction heat is released which further amplifies the reaction. Electricity is generated by transforming mechanical energy (heat) to electrical energy in a turbine or generator.

Explanation:

1 is true

2 is d 7

3 is

            1             e

            2             b

            3             d

            4             a

            5             c

Answer:

A, it is metal oxide

Answer:

okay....

Explanation:

technically, fish do not have wings. they are called fins and they are used for the purpose of transportation, just as legs are for humans.

~Ren

Answer:

273 mL.

Explanation:

From the question given above, the following data were obtained:

Molarity of HBr = 0.220 M

Mole of HBr = 0.060 mole

Volume =?

Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:

Molarity = mole /Volume

With the above formula, we can obtain the volume required as illustrated below:

Molarity of HBr = 0.220 M

Mole of HBr = 0.060 mole

Volume =?

Molarity = mole /Volume

0.220 = 0.060 / Volume

Cross multiply

0.220 × Volume = 0.060

Divide both side by 0.220

Volume = 0.060 / 0.220

Volume = 0.273 L

Finally, we shall convert 0.273 L to millilitres (mL). This can be obtained as follow:

1 L = 1000 mL

Therefore,

0.273 L = 0.273 L × 1000 mL / 1 L

0.273 L = 273 mL

Thus, 0.273 L is equivalent to 273 mL.

From the calculations made above, 273 mL of HBr is required.

The volume of 0.220 M HBr solution (in mL) required to obtain 0.060 moles of HBr is 272.7mL

From the question,

We are to determine the volume of 0.220M HBr solution that is required to obtain 0.060 moles of HBr.

To determine this, we will use the formula connecting number of moles, concentration and volume

From the formula,

Number of moles = Concentration × Volume

Then,

[tex]Volume = \frac{Number \ of \ moles}{Concentration}[/tex]

From the question,

Concentration of the HBr solution = 0.220 M

Required number of moles of HBr = 0.060 moles

∴ [tex]Volume \ of \ HBr \ required = \frac{0.060}{0.220}[/tex]

Volume of HBr required = 0.272727 L

Now, we will convert this to milliliter (mL)

(NOTE: 1L = 1000 mL)

∴ 0.272727 L = 0.272727 × 1000 mL

= 272.727 mL

≅ 272.7 mL

Hence, the volume of 0.220 M HBr solution (in mL) required to obtain 0.060 moles of HBr is 272.7mL

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Answer:

[tex]n_{HCl}=0.2molHCl\\n_{H_2SO_4}=0.1molH_2SO_4[/tex]

Explanation:

Hello!

In this case, since the reactions between NaOH and the acids are:

[tex]NaOH+HCl\rightarrow NaCl+H_2O\\\\2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O[/tex]

Whereas we can see the 1:1 and 2:1 mole ratios between NaOH and HCl and H2SO4 respectively. In such a way, at the equivalence point we realize that:

[tex]n_{HCl}=n_{NaOH}=V_{NaOH}M_{NaOH}=0.01L*20mol/L=0.2molHCl\\\\2n_{H_2SO_4}=n_{NaOH}\\\\n_{H_2SO_4}=\frac{1}{2} V_{NaOH}M_{NaOH}=\frac{0.01L*20mol/L}{2} =0.1molH_2SO_4[/tex]

Best regards!

Answer : It’s C.

Cccccccccccccccccccccccccccccccccccccccc

The model of the chemical reaction that best represent the law of conservation of mass is the model with a balanced equation.

The correct answer to the question is the third option.

The statement above, suggest that unbalanced equation simply means matter has been created or destroyed.

Therefore, the correct answer to the question given above will be the option in which the equation is balanced.

The option with a balanced equation is the third option.

See attachment photo.

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1.Sodium metal reacts rapidly with water to form a colorless solution of sodium hydroxide ... strip is placed in a test tube containing 5 mL of hydrochloric acid, HCl. Both liquids ... If it fizzes and bubbles

2.When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules.

3.When platinum is heated, then cooled to its original state, we say this is a physical change. 19. ... Scratches glass. Sour taste ... A bar of lead is more easily bent than is a bar of aluminum of the same size.

Answer:

none of these

Explanation:

The expression:

      P1/T1 = P2/T2 is a derivative of the combined gas law.

From the combination of the Boyle's and Charles's law, if the volume is taken to be constant, the pressure of the given mass of gas is directly proportional to the absolute temperature.

This is how the expression

      P1/T1 = P2/T2 was obtained.

Answer:

The correct is the letter B

Answer: omg this is so old! :D but its D!

Explanation:

The cells that has been composed of the indifferent number chromosomes as compared to other cells have been reproductive cells. Thus, option D is correct.

Cells have been the smallest and the unit of life. The cells have been composed of the pairs of chromosomes in higher organisms. There has been the presence of 46 chromosomes i.e. 23 pairs of chromosome. However, the chromosomes in the cell have been diploid i.e. in set of 2.

The reproductive cells have been resulted in the formation of the new cells. So they have been consisted of the cells with the half the number of chromosomes and are haploid in nature.

Thus, the cells that have different number of chromosomes as compared to the other cells have been reproductive cells. Thus, option D is correct.

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Answer:

C. The reaction rate at known reaction concentrations

Explanation:

The rate of a reaction is the measure of the speed of a chemical reaction. To find the rate constant of a reaction, the concentration of the reactants must be known.

Answer:

C. ApE x Approved

Explanation:

Trust

Answer: The [tex]K_b[/tex] for the weak base is [tex]3.5\times 10^{-3}[/tex]

Explanation:

[tex]A^-+H_2O\rightarrow HA+OH^-[/tex]

cM                   0          0

[tex]c-c\alpha[/tex]           [tex]c\alpha[/tex]       [tex]c\alpha[/tex] 

So dissociation constant will be:

[tex]K_b=\frac{[HA][OH^-]}{[A^-]}[/tex]

[tex]K_b=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]

Given :

c= 0.0910 M and pH = 10.50

pOH = 14-pH = 14-10.50 = 3.5

Also [tex]pOH=-log[OH^-][/tex]

[tex][OH^-]=antilog(-3.5)= 3.2\times 10^{-4}M[/tex]

[tex][OH^-]=c\alpha=3.2\times 10^{-4}[/tex]

[tex]K_b=\frac{(3.2\times 10^{-4})^2}{(0.0910-3.2\times 10^{-4}}[/tex]

[tex]K_b=\frac{(3.2\times 10^{-4})^2}{(0.09068}[/tex]

[tex]K_b=3.5\times 10^{-3}[/tex]

Thus [tex]K_b[/tex] for the weak base is [tex]3.5\times 10^{-3}[/tex]

The Kb for the unknown weak base is 3.5 × 10⁻³.

Dissociation constant for a weak base at equilibrium is the ratio of the product of concentration of product to the concentration of un-ionized base.

Chemical reaction for a weak base at initial and equilibrium state can be represented as follow:

[tex]\[\mathop {{{\rm{A}}^{\rm{ - }}}}\limits_{\scriptstyle{\rm{c}}\hfill\atop\scriptstyle{\rm{c - c\alpha }}\hfill} {\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}}\mathop { \to {\rm{HA}}}\limits_{\scriptstyle{\rm{0}}\hfill\atop\scriptstyle{\rm{c\alpha }}\hfill} {\rm{ + }}\mathop {{\rm{O}}{{\rm{H}}^{\rm{ - }}}}\limits_{\scriptstyle{\rm{0}}\hfill\atop\scriptstyle{\rm{c\alpha }}\hfill} \][/tex]

Kb = [HA] [OH⁻] / [A⁻]

Kb = (c∝)² / (c - c∝)

In the question given that,

pH = 10.50

Concentration of weak base c = 0.0910 M

We know that, pOH = 14 - pH

pOH = 14 - 10.50 = 3.5

Also we now that,

pOH = -log[OH⁻]

[OH⁻] = c∝ = antilog (-3.5) = 3.2 × 10⁻⁴ M

Now we put all these values in the above equation of Kb, we get

Kb = (3.2 × 10⁻⁴)² / (0.0910 - 3.2 × 10⁻⁴) = 3.5 × 10⁻³

Hence, 3.5 × 10⁻³ is the value of Kb.

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Answer: the weight loss of zinc per hour is 6.1 g/h

Option c) 6.1 g/h is the correct answer.

Explanation:

Given that

copper cathode area is =  100 cm²

zinc anode area = 1 cm²

current density at the copper cathode = 0.05 A/cm²

The corrosion current can be converted to a rate of metal loss from its surface by using Faraday's law

W = ItM / nF

W is weight loss of metal , I is current ,

I = iCu × ACu = 0.05 A/cm² x 100 cm² = 5.0 A

M is atomic weight of metal

Atomic mass of Zn = 65.38 g/mol

n = number of electron

F = Faraday’s constant = 96,500 C/mol

so we substitute

W loss of Zn = (5 A) × (3600/h) (65.38 g/mol) / [2 × (96,500 C/mol) ]

= 1176840 / 193000

= 6.098 ≈ 6.1 g/h

Therefore the weight loss of zinc per hour is 6.1 g/h

Option c) 6.1 g/h is the correct answer.

Answer:

4Fe + 6H2O + 3O2 -------> 4Fe(OH)3

Explanation:

The chemical reaction involves the fewest oxygen atoms is 4Fe + 6H2O + 302 4Fe(OH)3. Therefore, option B is correct.

The chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances.

When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

We can learn about a substance's qualities by studying chemical reactions. We can learn about a substance's chemical characteristics by looking at how it interacts with other substances. These characteristics can be utilized to recognize an unidentified sample.

Thus, option B is correct.

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The total mass of the cylinder and the water is 47.431g.

According to this question, the mass of an empty graduated cylinder is 35.101 g.

A graduated cylinder is known to be an item of glass laboratory equipment consisting of a tall, narrow cylinder with a scale, or graduations marked up its length, which is used to measure liquids and solutions fairly accurately, but not precisely.

If 12.33 g of water is added to this cylinder, the total mass of the cylinder and the water that was added can be calculated as follows:

Total mass = 12.33g (water) + 35.101g (empty cylinder) = 47.431g

Therefore, the total mass of the cylinder and the water is 47.431g.

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Answer:

Try to go to quizzlet

Explanation:

Answer:

j

Explanation:

The exclusion zone restricts access to the area around Chernobyl. The soil is still radioactively contaminated after the Chernobyl nuclear explosion. Chernobyl had four nuclear reactors. Uranium dioxide, UO2, was the fuel in the reactors in Chernobyl.

Control rods slow chemical reactions because they absorb neutrons. This prevents the neutrons from reacting with additional uranium Protons and neutrons are found in the nucleus of an atom.

Isotopes are atoms of the same element that have the same number of protons and electrons but different numbers of neutrons. Iodine -131 half-life of eight days, strontium – 90 half-life of 29 years, cesium-137 half-life of 30 years In fission, the nucleus of a Uranium dioxide U-235 atom is bombarded by a neutron.

This splits the nucleus to release a daughter nuclei, more neutrons, and energy. If we start with a 30 g sample of Uranium dioxide I-131, there would be 7.5 grams of I-131.be after 16 days When one atom of uranium goes through fission, the reaction releases a small amount of energy. When the reaction is repeated on the mole scale though, the self-sustaining reaction becomes significantly larger, producing exponentially more energy.

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Answer:

The one with the greatest mass would be the one that has the most things in the nucleus, protons and nutrons

Explanation:

Answer:

V ≈ 646.50 L

General Formulas and Concepts:

Chemistry - Gas Laws

Explanation:

Step 1: Define

RxN:   N₂H₄ (g) + O₂ (g) → N₂ (g) + 2H₂O (l)

Given:   34.9 °C, 755.08 torr, 914.894 g H₂O

Step 2: Identify Conversions

Kelvin Conversion

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

Stoichiometry:   [tex]914.894 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O} )(\frac{1 \ mol \ N_2}{2 \ mol \ H_2O} )[/tex] = 25.3955 mol N₂

Temperature:    34.9 + 273.15 = 308.05 K

Step 4: Find Volume

Step 5: Check

We are given 5 sig figs as our lowest. Follow sig fig rules and round.

646.502 L ≈ 646.50 L

The number of moles of Ca(OH)2 formed is 4.33 moles.

Given,

number of moles of H₂O = 4.33

The balanced equation is :

CaO + H₂0 → Ca(OH)₂

From the balanced chemical reaction, we conclude that,

As 1 moles of H₂O  react with 1 mole of Ca(OH)₂

Then, 4.33 moles of H₂O will react with 4.33 moles of H₂O.

Thus, the number of moles of Ca(OH)₂ formed will be 4.33 moles.

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Balanced equation :

3H₂+N₂⇒2NH₃

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Unbalanced⇒the number of atoms from both sides (reactants and products) is not the same

H₂+N₂⇒NH₃

H=2(left), H=3(right)

N=2(left), N=1(right)

Balanced ⇒ the number of atoms from both sides (reactants and products) is equal

3H₂+N₂⇒2NH₃

H=3x2=6(left), H=2x3=6(right)

N=2(left), N=2x1=2(right)