Hello!!
Who was Neil Bohr?
Explain the theory he introduced.
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Answer:

Density = 4.06 * 10^14

Explanation:

Givens

r = 1 * 10^-13 cm

m = 1.7 * 10^-24 grams

Formula

V = 4/3 * pi * r^3

D = m/V

Solution

Put the givens into the formula.

V = (4/3) 3.14 * (1 * 10^-13)^3          Find the value for r^3

V = (4/3) 3.14 * 1 * 10^-39               Find the volume. Indicate divide by 3

V = 1.256 10^-38/3

V = 4.1867 * 10^-39

Density = m / v

Density = 1.7*10^-24/4.1867*10^-39  Do the division

Density = .406 * 10^(-24 + 39)

Density = .406 * 10^15 grams/ cm^3

Answer: Density = 4.06 * 10^14

The material which requires the most heat to raise its temperature from 10°C to 30°C is oil.

The formula which we used to calculate the amount of involved heat in relation with specific heat is:

Q = mcΔT, where

Among the given materials, specific heat of oil is highest than other materials so will require maximum absorbed heat.

Hence, oil requires the most heat.

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Answer:

Wave X

Explanation:

because the lower the frequency, the longer the wave length

Answer:

Wave X is the correct answer. Hope it helps!

Explanation:

Answer:

Reactants are on left side ( Hydrogen + oxygen).

products are on right side (Water)

Explanation:

Things that go into reaction are called reactants.

things that go out of reaction are called products.

Answer:

glycolysis is an example of aerobic metabolism option A is the correct answer of given statement

Answer:

Molarity=0.271M

Explanation:

molarity=moles/volume

moles=5.10/180.16

=0.0283 moles

volume=0.1045L

Molarity=0.0283/0.1045

             =0.271M

Answer:

Green=2.81

Yellow=10^-5

Explanation:

It is the correct answer. the exponent power will become 10^-4 without any calculations

Answer:

[H3O+] = 1.4*10^-5 M

pH = 4.85

[OH-] = 7.08*10^-10

Explanation:

As pH is a measure of hydronium H3O concentration, simply substitute [H3O+] into the following equation:
pH = -log[H+]
pH = -log(1.4*10^-5)
pH = 4.853871...
Round to 2-3 sig figs due to only being given data with 2 significant figures
pH = 4.85

One method to get to [OH-] is to turn pH into pOH and then use inverse functions to get [OH-]
pH + pOH = 14
4.85 + pOH = 14
pOH = 9.15

Then to get [OH-] from pOH:
pOH = -log[OH-]
9.15 = -log[OH-]
-9.15 = log[OH-]
10^(-9.15) = [OH-]
7.07945784 * 10^-10 = [OH]
Round based on given significant figures again:
7.08*10^-10 = [OH-]

(Feel free to add any questions & I'll be sure to reply if clarification is needed)

[H₃O]=1.4 x 10⁻⁵

pH = 5 - log 1.4

pOH = 9 + log 1.4

[OH⁻] = 1 x 10⁻¹⁴ : 1.4 x 10⁻⁵ = 7.14 x 10⁻¹⁰

For a 3.00 aqueous solution of Koh contains 195 g of Koh. The solution has a density of 1.29 g/ml and is mathematically given as

molarity = 1.16L

molarity of solution = 0.946M

percentage concentration = 5%

Generally, the equation for molarity is mathematically given as

molarity = no of moles/ volume in liters

no of mol = 195/56.1

no of mol = 3.48

molarity = 3.48/3.00

molarity = 1.16L

therefore,

mass = 1.29 g/ml x 3000mL

mass = 3.87kg/mL

mass of solute is

= 3.87-0,195

= 3.675

molarity of solution

= 3.48/3.675

molarity of solution = 0.946M

In conclusion, the percentage concentration is

= 195/3870 x100

percentage concentratio = 5%

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Answer: Heyya, the answer is  0.8539gH2. Pls mark brainliest

Explanation:

Answer:

They reflect 4 percent of solar radiation that reaches the surface.

Explanation:

When the sun angle is high and water is liquid notice, there is less reflection that takes place.

Answer:

Depends on what the answers say.

Explanation:

But from what I know, the equation is:

6CO2 + 6H2O------> C6H12O6 + 6O2

And also that arrow there should mean in the presence of sunlight and chlorophyll.

Answer:

A line connecting five stars together

Explanation:

Constellations or patterns (same thing) are made up of stars. The stars form shapes, but there is not really lines in the sky. We have to draw the lines with our head or take a picture of it and draw lines on it. Some patterns are: the big dipper, the small dipper etc. Last but not least, just some random info about the constellations.. zodiac signs have their own constellations. Here is a list of the zodiacs to their constellations:

•Leo (the Lion)

•Aquarius (the Water Bearer)

•Gemini (Twins)

•Cancer (Crab)

•Aries (Ram)

•Scorpio (Scorpion)

•Taurus (Bull)

•Sagittarius (Archer)

•Capricorn (Sea Goat)

•Pisces (Fishes)

•Libra (Scales)

•Virgo (V-i-r-g-i-n: Maiden)

Boyle's Law

P₁V₁=P₂V₂

6.9 = P₂.12

P₂ = 4.5 atm

Answer:

282420J

Explanation:

Q = mc∆T

= 1500 x 4.184 x (50 - 5)

= 282420J

Answer:

Average atomic mass = 63.62 amu

Explanation:

Average atomic mass is the weighted average of the individual isotopes.

And thus the weighted average =

(0.6917×63+0.3083×65)⋅amu = ?? amu.

Note that we have not accounted for the less massive copper isotopes that would decrease this mass to the accepted value of

63.55 amu.

Hope this helps! Good luck!

Answer:

990

Explanation:

Given the initial volume, temperature and pressure of the gas, at Standard conditions for temperature and pressure, the new volume will be 310mL.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

At Standard conditions for temperature and pressure

To calculate the new volume the gas, we substitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

V₂ = P₁V₁T₂ / P₂T₁

V₂ = ( 0.690846atm × 0.5L × 273.15K )  / ( 1.0atm × 303.15K )

V₂ = 94.3522925LatmK / 303.15atmK

V₂ = 0.31L

V₂ = 310mL

Given the initial volume, temperature and pressure of the gas, at Standard conditions for temperature and pressure, the new volume will be 310mL.

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Answer:

18.066 x 10^23 atoms of Au

Explanation:

ONE mole = 6.022 x 10^23  particles

3   x   6.022 x 10^23

Answer:

A

Explanation:

The forward reaction would be favoured as the increase in temperature would cause more heat for the reaction to absorb so the endothermic reaction would be increased.

Alcohols have higher boiling points than do ethers and alkanes of similar molar masses.

The temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid is called the boiling point of the substance.

Approximately boiling point of Ethanol: 78.4°C, ether: 34.6°C, ethanes: 68°C

The reason for the difference is that it takes more energy to separate alcohol molecules then it does to separate alkane molecules and ether molecules.

The OH group in  alcohol allows molecules to engage in hydrogen bonding.

Therefore Boiling point are in the order ;

Alcohol > alkane > ethers

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There are so many routes by which water can move through the various stages in the water cycle.

The water cycle has to do with the route of movement of water in the enviroment. We have to note that there are so many routes by which water can move through the various stages in the water cycle.

The sun supplies the energy that drives the water cycle. This is seen in the fact that the supply of energy from the sun is required for evaporation to take place.

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The percent by mass of 110.6 g of potassium fluoride (NaF) dissolved in 1500.0 g of water is 0.073733 %.

The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.

[tex]\rm\;Mass \;percentage =\frac{\;Mass \;of \;solute}{\;Mass \;of \;solution}[/tex]

Calculate the mass percent of potassium fluoride, using the formula:

[tex]\rm\;Mass \;percentage =\frac{\;Potassium \;fluoride}{\;Mass \;of \;Water}[/tex]

[tex]\rm\;Mass \;percentage =\frac{110.6}{1500.0}[/tex]

Mass percentage = 0.073733 %

Hence,  the percent by mass of 110.6 g of potassium fluoride (NaF) dissolved in 1500.0 g of water is 0.073733 %.

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mol of excess acid: 50 cm ³x 0.05 M = 2.5 mlmol

mol of acid reacted: (250 cm³ x 0.05 M) - 2.5 mlmol = 10 mlmol = 10 x 10⁻³ mol

MM (molar mass) MO = mass : mol = 0.28 : 10 x 10⁻³ =  28

MM MO = Ar M + Ar O

28 = Ar M + 16

Ar M = 12

I think the answer is A

Answer:

Organic matter is composed of living things (plant roots and organisms), dead things (recent plant and animal residue), and very dead things (highly decomposed material, or humus).

Explanation:

hope this helps if not let me know have a great day

The mass of the gas dissolved in 1.00 L of water at 25°C and 3.0 atm is equal to 1.26 grams.

In order to determine the mass of the gas dissolved, we would the calculate the new (final) solubility of this gas by applying this formula:

S₁P₂ = S₂P₁

Making S₂ the subject of formula, we have:

S₂ = (S₁P₂)/P₁

S₂ = (0.42 × 3.0)/1.0

S₂ = 1.26 g/L.

Now, we can determine the mass:

Mass = solubility × volume

Mass = 1.26 × 1.00

Mass = 1.26 grams.

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