CHEMISTRY HIGH SCHOOL

Determine the percent composition of chlorine (Cl) in sodium chloride (NaCl). .

Answers

Answer 1
Answer:

Answer:

\% Cl=61.65\%

Explanation:

Hello,

In this case, chlorine's percent composition is given by the shown below formula:

\% Cl=(n_(Cl)m_(Cl))/(M_(NaCl))*100\%

Whereas n_(Cl) accounts for the number of chlorine atoms into the NaCl, m_(Cl) for chlorine's atomic mass and M_(NaCl) for sodium chloride's molar mass, therefore, the percent composition of chlorine turns out:

\% Cl=(1*35.45)/(58.45)*100\%=61.65\%

Best regards.
Answer 2
Answer: It's (grams-of-Cl/total-grams)(100), so (35.45g/58.44g)(100) = 60.66% Cl. Hope this helps!

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Your boss asks you to design a room that can be as soundproof as possible and provides you with threesamples of material. The only information on each sample's label is the material's coefficient of absorption.
The coefficient of absorption listed on Sample A is 30%, on Sample B is 47%, and on Sample C is 62%.
When your boss asks for your choice and the reasoning behind it, what would you tell him?
A. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
B. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
C. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.
D. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.

Answers

Answer: The correct answer is Option C.

Explanation: For a room to be soundproof, there should be minimum reflection of the sound waves and maximum absorption of the waves.

According to the question, the coefficient of absorption is maximum for Sample C. So, this sample will reflect minimum waves and will absorb maximum waves.

Hence, this sample is the best for making the room soundproof. Hence, the correct answer is Option C.
The right answer for the question that is being asked and shown above is that: "B. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest."

Which energy transformation occurs when anelectrolytic cell is in operation?
(1) chemical energy → electrical energy
(2) electrical energy → chemical energy
(3) light energy → heat energy
(4) light energy → chemical energy

Answers

The correct answer is option 1. The operation in an electrolytic cell transforms energy from chemical energy to electrical energy. This is a cell which electrolysis occurs to produce electrochemical reaction and eventually producing an electric current.

Answer:

(2) electrical energy -> chemical energy

Explanation:

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Why does secondary succession usually occur more rapidly than primary succession.

Answers

Secondary succession occurs more rapidly than primary because soil is already available so there is no need for any other species. Also, there might still be surviving species in the soil present like seeds, roots and other plant organs.

Which layer of the earth can only be studied by indirect means

Answers

The mantle stretches down 2,890 kilometers, making it the Earth's thickest layer and the core that can be studied only by indirect means.

What are the layers of earth?

The layers of earth can be defined as the layer which is present inside the earth surface.

There are  basically three different layers of earth.

  • Crust -  It is defined as the a rocky planet's, dwarf planet's, or natural satellite's outermost solid shell.
  • Mantle - It is defined as the thick layer of heated, solid rock between the Earth's crust and the molten iron core.
  • Core - It is defined as the center of gravity where all the movements begins.

Thus, the mantle stretches down 2,890 kilometers, making it the Earth's thickest layer and the core that can be studied only by indirect means.

To learn more about the layers of earth, refer to the link below:

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#SPJ2
Everything except for the crust, including the Mantle and the core.

A national convention occurs every four years. Who is responsible for organizing this event? A. national party chairperson B. speaker of the house C. majority leader D. vice president

Answers

A national convention occurs every four years, so political parties can nominate their presidential bet for the coming elections. This signifies the end of a presidential primary season. It is convened by the political party's national committee, and is headed by the A. national party chairperson.

Calculate the mass of copper if 2653.8 J of copper is cooled from 155 oC to 23 oC. The specific heat of copper is 0.385 J/g*oC.

Answers

Answer:

The answer to your question is   m = 52.22 g

Explanation:

Data

mass of Cu = ?

Energy = 2653.8 J

temperature 1 = 155°C

temperature 2 = 23°C

Specific heat = 0.385 J/g°C

To calculate the mass of Copper, use the formula of specific heat and solve it for mass.

Formula

                      Q = mC(Temperature 2 - Temperature 1)

Solve for m

                       m = Q / C (Temperature 2 - Temperature 1)

Substitution

                        m = 2653.8 / 0.385(23 - 155)

Simplification

                        m = 2653.8 / 0.385(132)

                        m = 2653.8 / 50.82

Result

                        m = 52.22 g

Answer:

The mass of the copper is 53.22 grams

Explanation:

Step 1: Data given

Energy = 2653.8 J

Initial temperature = 155 °C

Final temperature = 23°C

Specific heat of copper = 0.385 J/ g°C

Step 2: Calculate mass of copper

Q = m*c*ΔT

⇒ with Q = the energy = 2653.8 J

⇒ with m = the mass of copper = TO BE DETERMINED

⇒ with c= The specific heat of copper = 0.385 J/g°C

⇒ΔT = The difference in temperature = T2 - T1 = 23 - 155 = -132°C

2653.8 J = m * 0.385 J/g°C * 132 °C

m = 2653.8 / (0.385*132)

mass of copper = 52.22 grams

The mass of the copper is 53.22 grams
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