2. Calculate the wavelength in nm of a photon with an energy of 2.57 x 10-19 J.

The mean of the data set is approximately 4.0626, and the 90% confidence interval is [4.060925, 4.064275].

The sample mean (x) is calculated as follows:

x = (4.0620 + 4.0550 + 4.0650 + 4.0740 + 4.0550 + 4.0660) / 6

x ≈ 4.0626 (rounded to four decimal places)

The 90% confidence interval is calculated as follows;

Standard deviation (s):

(4.0620 - 4.0626)² = 0.00000036

(4.0550 - 4.0626)² = 0.00000576

(4.0650 - 4.0626)² = 0.00000006

(4.0740 - 4.0626)² = 0.00001328

(4.0550 - 4.0626)² = 0.00000576

(4.0660 - 4.0626)² = 0.00000012

average of the squared differences:

(0.00000036 + 0.00000576 + 0.00000006 + 0.00001328 + 0.00000576 + 0.00000012) / 6 ≈ 0.00000624

s = √(0.00000624)

s ≈ 0.002496

the standard error of the mean (SEM):

SEM = 0.002496 / √6

SEM ≈ 0.001018

For a 90% confidence interval, the z value is approximately 1.645.

ME = 1.645 * 0.001018 ≈ 0.001675

CI = x ± ME

CI = 4.0626 ± 0.001675

CI ≈ [4.060925, 4.064275]

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Answer:

\(\frac{1000}{3}\)  

Explanation:

Given problem:

    log 9x - log 3  = 3

To solve this problem, we need to find the value of x for which when the expression is simplified, we would a solution of 3;

   From log rules;

          log a - log b  = log \(\frac{a}{b}\)  

 So;

      log 9x - log 3 = 3

      log( \(\frac{9x}{3}\))   = 3

        log 3x  = 3

 So;

            3x  = 10³

              x  = \(\frac{1000}{3}\)  

Answer:

220.1 grams of CO2.

The question is incomplete, the complete question is;

1.000 atm of Oxygen gas, placed in a container having apinhole opening in its side. leaks from the container 2.14 timesfaster thatn 1.000 atm of an unknown gas placed in this sameapparatus. Which of the following species could be theunknown gas?

A. CL2

B. SF6

C. Kr

D. UF6

E. Xe

Answer:

SF6

Explanation:

From Graham's law;

Let the rate of diffusion of oxygen be R1

Let the rate of diffusion of unknown base be R2

Let the molar mass of oxygen by M1

Let the molar mass of unknown gas be M2

Hence;

R1/R2 = √M2/M1

So;

2.14/1 = √M2/32

(2.14/1)^2 = M/32

M= (2.14/1)^2 × 32

M= 146.6

This is the molar mass of SF6 hence the answer above.

The second option 1,870.4 Joules

Answer:

The number of moles of water that can be made when 177.3 grams of HNO3 are consumed is 11.0.

This can be calculated using the following equation:

177.3 g HNO3 x (1 mol HNO3 / 63 g HNO3) x (2 mol H₂O / 6 mol HNO3) x (18 g H₂O / 1 mol H₂O) = 11.0 g H₂O

The molar mass of the unknown gas in the 500 mL flask at stp is 89.7 g/mol

We'll begin by calculating the number of mole of the gas that occupied 500 mL at stp.

Recall at stp:

22400 mL = 1 mole of the gas

Therefore,

500 mL = 500 / 22400 = 0.0223 mole of gas.

Finally, we shall determine the molar mass of the gas. This can be obtained as follow:

Mass of gas = 2 g

Mole of gas = 0.0223 mole

Molar mass = mass / mole

Molar mass of gas = 2 / 0.0223

Therefore, the molar mass of the unknown gas is 89.7 g/mol

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Answer:i believe 9-?

Explanation:

boron-10

boron-11

carbon-12

carbon-13

oxygen-16

oxygen-17

oxygen-18

chlorine-35

chlorine-37

Explanation:

When a chlorine atom forms an ion, it gains electrons, making it negative.  A neutral chlorine will become a chlorine with a -1 charge.  When it gains an electron, the radius increases.

When a sodium atom forms an ion, it loses electrons, making it positive.  A neutral sodium will become a sodium with a +1 charge.  When it loses an electron, the radius decreases.

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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Answer:

Metals

Explanation:

Two Thirds means 75 %.

Metals account for about more than two - thirds of all elements.

Hello, this is Bing. I can help you with your question. Based on the information I found on the web, **H2** can be broken down into its two atoms of hydrogen (H) by supplying enough energy to overcome the bond that holds them together⁴. This process is called **dissociation** and requires an energy equal to or greater than the **dissociation energy** of H2, which is about 436 kJ/mol⁴.

One way to break down H2 is by using **electricity** to split water (H2O) into hydrogen (H2) and oxygen (O2) through a process called **electrolysis**¹. In this process, water is decomposed into its elements by passing an electric current through it. The electric current is provided by a battery or another source of electricity and the water needs to have an **electrolyte**, such as salt or acid, added to it to make it conductive¹. Two electrodes, usually made of metal or other conductive material, are inserted into the water and connected to the battery. The electrode connected to the positive terminal of the battery is called the **anode** and the one connected to the negative terminal is called the **cathode**¹. When the electric current flows through the water, hydrogen gas bubbles form at the cathode and oxygen gas bubbles form at the anode¹. The overall chemical reaction for electrolysis of water is:

2 H2O → 2 H2 + O2

Another way to break down H2 is by using **heat** to cause a reaction between hydrogen and oxygen that produces water and releases a large amount of energy. This reaction is called **combustion** or **oxidation** and can be ignited by a spark or a flame³. The reaction is very fast and explosive and can be dangerous if not controlled. The overall chemical reaction for combustion of hydrogen is:

2 H2 + O2 → 2 H2O

I hope this helps you understand how H2 can be broken down and what methods are used to do so.

Answer: The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from  

n

i

=

2

to  

n

f

=

6

.

A good starting point here will be to calculate the energy of the photon emitted when the electron falls from  

n

i

=

6

to  

n

f

=

2

by using the Rydberg equation.

1

λ

=

R

⋅

(

1

n

2

f

−

1

n

2

i

)

Here

λ

si the wavelength of the emittted photon

R

is the Rydberg constant, equal to  

1.097

⋅

10

7

m

−

1

Plug in your values to find

1

λ

=

1.097

⋅

10

7

.

m

−

1

⋅

(

1

2

2

−

1

6

2

)

1

λ

=

2.4378

⋅

10

6

.

m

−

1

This means that you have

λ

=

4.10

⋅

10

−

7

.

m

So, you know that when an electron falls from  

n

i

=

6

to  

n

f

=

2

, a photon of wavelength  

410 nm

is emitted. This implies that in order for the electron to jump from  

n

i

=

2

to  

n

f

=

6

, it must absorb a photon of the same wavelength.

To find the energy of this photon, you can use the Planck - Einstein relation, which looks like this

E

=

h

⋅

c

λ

Here

E

is the energy of the photon

h

is Planck's constant, equal to  

6.626

⋅

10

−

34

.

J s

c

is the speed of light in a vacuum, usually given as  

3

⋅

10

8

.

m s

−

1

As you can see, this equation shows you that the energy of the photon is inversely proportional to its wavelength, which, of course, implies that it is directly proportional to its frequency.

Plug in the wavelength of the photon in meters to find its energy

E

=

6.626

⋅

10

−

34

.

J

s

⋅

3

⋅

10

8

m

s

−

1

4.10

⋅

10

−

7

m

E

=

4.85

⋅

10

−

19

.

J

−−−−−−−−−−−−−−−−−  

I'll leave the answer rounded to three sig figs.

So, you can say that in a hydrogen atom, an electron located on  

n

i

=

2

that absorbs a photon of energy  

4.85

⋅

10

−

19

J

can make the jump to  

n

f

=

6

.

Explanation:

Answer:

Aluminum foil ~ element

Air ~ mixture

Water ~ compound

Salt Water ~ mixture

Copper Wire ~ element

Steel ~ element

The equation of the nuclear reaction of the positron emitter is:

\(^{29}P_{15}\longrightarrow^{29}Si_{14} +^0e_{+1}\)

In nuclear chemistry, a nuclear reaction can be described as a process in which two nuclei and an external subatomic particle, collide to form one or more new nuclides. Therefore, a nuclear reaction should cause a transformation of one nuclide to another.

The term "nuclear reaction" refers either to a change in a nuclide induced by collision with a particle or to a spontaneous change of a nuclide without collision.

The emission of a positron from phosphorous-29 can be represented:

\(^{29}P_{15}\longrightarrow^{A}X_{Z} +^0e_{+1}\)

15 = Z +1

Z = 14

and,  29 = A + 0

A = 29

The product of the given nuclear reaction is ²⁹Si₁₄.

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Answer:

specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degrees.

Explanation:

the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).

Answer:

The answer is barium phosphate

The concentration of the original sulfuric acid solution is 0.05398M

In order to determine the concentration of the original sulfuric acid solution, we use the volume of the standard sodium hydroxide solution used in the titration along with the concept of stoichiometry.

Let us check the number of moles of sodium hydroxide (NaOH) used in the titration,

Moles of NaOH = Molarity of NaOH x Volume of NaOH

=0.1463M x 18.47 mL

= 0.002699 Moles

As the balanced chemical equation between Sulfuric acid (\(H_SO_4\)) and sodium hydroxide is 1:2, then we can deduct that 1 mole of sulfuric acid can react with 2 moles of sodium hydroxide.

In that case, the number of moles of sulfuric acid in the 10.00 mL sample is;

Moles of \(H_2SO_4\) = 0.002699 Moles x (1/2)

= 0.0013495 Moles

Now we can calculate the concentration of the original sulfuric acid solution:

That is, the concentration of \(H_2SO_4\) = Moles of \(H_2SO_4\) / Volume of original acid solution

=0.0013495 Moles / 0.02500L

=0.05398 M

Therefore, the concentration of the original sulfuric acid solution is approximately 0.05398 M.

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The pressure of the chlorine gas at the given condition is 1.7 atm.

The pressure of the chlorine gas at the given condition is calculated by applying ideal gas law.

PV = nRT

where;

The number of moles of 25 g of chlorine is calculated as follows;

n = m/M

n = 25/71

n = 0.352

The pressure of the chlorine gas at the given condition is calculated as;

P = nRT/V

P = (0.352 x 0.0821 x 263) / (4.5)

P = 1.7 atm

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Answer:

C. Oxygen

Explanation:

Oxygen has 8 electrons and doesn't react with fluorine noble gases

Answer:

1. Uniform, non visible

2. Visible, non uniform

3. Uniform, non visible

4. Visible, non uniform

5. Visible, non uniform

Explanation:

A heterogeneous mixture is simply any mixture that is not uniform in composition — it's a non-uniform mixture of smaller constituent parts. By contrast, a mixture that is uniform in composition is a homogenous mixture

visible state of matter is when you can easily difference two components of a mixture

non visible is when the state of the matter in the substance is not visible to the eye, it can't be differentiated

Prior to 1982, penny dates' history

Years            weight (Mass)

\(1793-95\)       \($13.48 \mathrm{gm}$\)

\($1795-1857$\)   \($10.89 \mathrm{gm}$\)

\($1856-1864$\)   \($4.67 \mathrm{gm}$\)

\($1864-1942$\)   \($3 \cdot 11 \mathrm{gm}$\)

\(1943$\\\)               \($2.72 \mathrm{gm}$\)

\($1944-46 \quad\)       \(3.11 \mathrm{gm}$\)

\($1947-62$\)          \($3 \cdot 11 \mathrm{gm}\)

\($1962-82 \quad\)       \(3.11 \mathrm{gm}$\)

How many pennies are post-1982 in number

Years                            weight (Mass)

\(1982 - present $\quad\)               \(2.5 \mathrm{gm}$\)

Then,

(C) Total no. of pennies =( No. g pennies duted before 1982)

+(No.g pernies duted after 1982) \($=(8+1)$\)

Total no. of Pennies =9

Over the past ten years, the cost of copper has more than doubled. Therefore, depending on the metal it contains, a penny made before 1982 is worth 2.2 cents. The U.S. Mint banned the melting down of pennies for financial gain in 2007.

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The best way to measure the pH of a natural solution while out in a forest is to use a portable pH meter or pH test strips specifically designed for field use. These instruments provide accurate and reliable pH measurements and are convenient for outdoor applications.

1. Prepare the necessary equipment: Before heading out to the forest, gather the required tools. You will need a portable pH meter or pH test strips, as well as the necessary reagents or calibration solutions if using a pH meter.

2. Collect the sample: Locate the natural solution you want to measure the pH of, such as a stream, pond, or soil. Use a clean container to collect a representative sample of the solution.

3. Calibrate the pH meter (if applicable): If you are using a portable pH meter, it is essential to calibrate it before taking measurements. Follow the manufacturer's instructions to calibrate the meter using the provided calibration solutions.

4. Conduct the measurement: For pH meters, immerse the electrode into the collected sample. Allow some time for the reading to stabilize, and then record the pH value indicated on the meter's display.

5. Using pH test strips: If you are using pH test strips, dip the strip into the collected sample for the recommended amount of time. Remove the strip and compare the color change with the provided color chart. Determine the corresponding pH value from the chart.

6. Repeat for accuracy: To ensure reliability, repeat the measurement process at least once and compare the results. This step helps confirm the accuracy of your measurements.

7. Record and analyze the data: Note down the pH values obtained and any relevant observations. Analyze the data as needed for your research or monitoring purposes.

By following these steps and using the appropriate equipment, you can effectively measure the pH of a natural solution while in a forest setting.

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Answer:

Fe2O3

Explanation:

get the ratio for both Fe and O using relative atomic mass and the percent as the mass

An electron

there is no table but an electron has a charge of -1

In the given case, we can conclude that  the Chlorine (Cl) has a charge of -1.

In order to determine which atom has a charge of -1, we need to look at the table. The charge of an atom is determined by the number of electrons it gains or loses.

Atoms gain or lose electrons to achieve a stable electron configuration, usually following the octet rule. In this case, the atom with a charge of -1 is chlorine (Cl).

Chlorine is a chemical element with the symbol "Cl" and atomic number 17. It belongs to the halogen group of the periodic table and is a highly reactive non-metal. Chlorine exists as a diatomic molecule (Cl2) in its natural state and is known for its distinctive yellow-green color and strong odor.

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Complete question

Based on the table, which atom has a charge of –1?

1 Chlorine

2 Fluorine

3 Iodine

Answer:

The container that has 0.20 moles of the compound has more moles compared to the container that has 0.15 moles of compound A

Explanation:

The molarity is defined as the concentration of a substance in solution, expressed as the number of moles of a solute per liter of solution.

From the given information.

In compound A

Molarity of the solution = 0.15 molar = 0.15 m/L

It implies that, In compound A, there are 0.15 moles present in 1 L of the solution.

Similarly;

In compound B

Molarity of the solution = 0.20 molar = 0.20 m/L

It implies that, In compound B, there are 0.120 moles present in 1 L of the solution.

Thus, we can conclude that:

The container that has 0.20 moles of the compound has more moles compared to the container that has 0.15 moles of compound A

Answer:

C2H60 & X2H60

Explanation:

Divide by the molar mass

Moles C= 53.13 g/ 12.011 g/mol =4.34

Moles H= 13.5 g/ 1.008 g/ mol= 13.4

Moles O= 34.72 g/ 15.999 g/ mol=2.170

Divide by the smallest

4.34 /2.17 =2 => C

13.4 / 2.17= 6=>H

2.170 / 2.17= 1=>O

The empirical formula is C2H60 (molar mass =46.08 g/mol)

X2H60 is also the molecular formula

Answer:

Hypothesis is an assumption or idea about a particular topic or argument. An hypothesis should be one which is able to be tested and measurable to determine its authenticity.

A theory is an explanation of a scientific observation which has undergone series of experiments and is reproducible in any part of the world.

A law is simply a rule which gives an in depth explanation of a scientific finding. If new findings emerge the law could be changed or modified.

As the concentration of a solution increases, the vapor pressure decreases.

Raoult's law states that the vapor pressure of a solution is proportional to the mole fraction of the solvent present in the solution.

When a solute is added to a solvent, it reduces the mole fraction of the solvent, and therefore the vapor pressure of the solution decreases. This is because the solute molecules occupy space on the surface of the solution, which reduces the number of solvent molecules that can escape into the gas phase, and thus reduces the vapor pressure of the solution.

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Complete question:

As the concentration of a solution increases, the vapor pressure _____