You have 28.5 g of iron shot that has a volume of 3.60 mL. From this information, calculate the density of iron.

a. 661.23 m/s

b.  the rate of effusion of Ammonia = 4.5 faster than Silicon tetra bromide

Given

T = 25 + 273 = 298 K

Required

a. the gas speed

b. The rate of effusion comparison

Solution

a.

Average velocities of gases can be expressed as root-mean-square averages. (V rms)  

[tex]\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}[/tex]

R = gas constant, T = temperature, Mm = molar mass of the gas particles  

From the question  

R = 8,314 J / mol K  

T = temperature  

Mm = molar mass, kg / mol  

Molar mass of Ammonia = 17 g/mol = 0.017 kg/mol

[tex]\tt v=\sqrt{\dfrac{3\times 8.314\times 298}{0.017} }=661.23~m/s[/tex]

b. the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

M₁ = molar mass Ammonia NH₃= 17

M₂ =  molar mass Silicon tetra bromide SiBr₄= 348

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{348}{17} }=4.5[/tex]

the rate of effusion of Ammonia = 4.5 faster than Silicon tetra bromide

Answer:

boron

Explanation:

Boron and aluminum lie in same group in modern periodic table and both have three valence electrons

Answer:

Sorry how no this equation guys

Answer:

elllo

Explanation:

Answer:

285g of fluorine

Explanation:

To solve this problem we need to find the mass of Freon in grams. Then, with its molar mass we can find moles of freon and, as 1 mole of Freon, CCl₂F₂, contains 2 moles of fluorine, we can find moles of fluorine and its mass:

Mass Freon:

2.00lbs * (454g / 1lb) = 908g of Freon

Moles freon -Molar mass: 120.91g/mol- and moles of fluorine:

908g of Freon * (1mol / 120.91g) =

7.5 moles of freon * (2moles Fluorine / mole Freon): 15 moles of fluorine

Mass fluorine -Atomic mass: 19g/mol-:

15 moles F * (19g / mol) =

Answer:

6.25%

Explanation:

Given data:

Half life of lutetium-117 = 6.75 days

Percentage remaining after 27 days = ?

Solution;

Number of half lives = Time elapsed / half life

Number of half lives = 27 days / 6.75 days

Number of half lives = 4

At time zero = 100%

At first half life = 100%/2 = 50%

At second half life = 50%/2 = 25%

At 3rd half life = 25%/2 = 12.5%

At 4th half life = 12.5%/2 = 6.25%

Answer:

the particles expand and the kinetic energy i think moves slower

Explanation:

Answer:

Absolute zero is the temperature at which the particles of matter (molecules and atoms) are at their lowest energy points. Some people think that at absolute zero particles lose all energy and stop moving. This is not correct. ... Scientists use lasers to slow atoms when cooling objects to very low temperatures.

Answer: A. Gamma radiation can pass through your body

Explanation:

Let's use the Process of Elimination for this problem.

We will start off with B. Gamma radiation is always dangerous to the body.

Facts: Gamma radiation are not always dangerous to the body. Most of the time, Gamma rays and radiation will go through with little to no effect at all. So, now we know that the answer can not be B. Gamma radiation is always dangerous to the body.

Next, let's check if C. Gamma radiation is produced when a neutron turns into a proton is true.

Facts: Gamma radiation has nothing to do with neutrons turning into protons and protons turning into neutrons. Gamma rays are a type of radiation that is everywhere. Gamma rays do not make neutrons into protons. Now, we will eliminate option C. Gamma radiation is produced when a neutron turns into a proton.

Let's check if D. Gamma radiation cannot go through surfaces rather, it will beures  off them is true or not is true or not.

Facts: Gamma rays can enter your body, they do not just bounce off of your body. Gamma rays are invisible and have no weight. They are like lasers and they can enter your body. Now, we know the answer should not be D. Gamma radiation cannot go through surfaces rather, it will beures  off them is not a true statement.

Finally, let's check if A. Gamma radiation can pass through your body is true or not.

Facts: Gamma rays can pass through your body because it is like a natural laser. They can also cause ionizations that can damage tissue in your body. But most of the time, the damage to your tissue is minor. So, we know A. Gamma radiation can pass through your body is a true statement.

Answer:

C. The gas enters the cryosphere as ice sheets

Answer:

D

Explanation:

Answer:

Answers with detail given below.

Explanation:

1) NaBr + KF    →       NaF  + BrK

Double replacement:

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

AB + CD → AD +CB

2)   2Cu + MnCl₂       →      2CuCl + Mn

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

3) CO₂     →    O₂  + C

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

4) C + 2H₂      →    CH₄

Combination reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

Answer:

Ketone molecule

Explanation:

The type of molecule shown above is ketone molecule.

A molecule is a group of two or more atoms that are chemically combine together or are tightly held together by attractive forces.

Hence, we can conclude that option D is the answer.

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Answer:

Contemporary light microscopes are able to magnify objects up to about a thousand times. Since most cells are between 1 and 100 μm in diameter, they can be observed by light microscopy, as can some of the larger subcellular organelles, such as nuclei, chloroplasts, and mitochondria.

Answer:

Mass = 1188.13 g

Explanation:

Given data:

Mass of ZnO produced = ?

Moles of oxygen = 7.3 mol

Solution:

Chemical equation:

2Zn + O₂       →      2ZnO

Now we will compare the moles oxygen and and ZnO.

               O₂          ;        ZnO

                1            :           2

              7.3          :           2/1×7.3 = 14.6 mol

Mass of ZnO:

Mass = number of moles × molar mass

Mass = 14.6 mol × 81.38 g/mol

Mass = 1188.13 g

Answer: The time after which the concentration of [tex]SO_2Cl_2[/tex] fall to 12.5% of its initial value is 26.2 hours

Explanation:

Expression for rate law for first order kinetics is given by:

[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant  = 100

a - x = amount left after decay process  = 12.5

a) for completion of half life:  

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]

[tex]k=\frac{0.693}{8.75hour}=0.0792hour^{-1}[/tex]

b) for concentration to fall to 12.5 % of initial value  

[tex]t=\frac{2.303}{0.0792}\log\frac{100}{12.5}[/tex]

[tex]t=26.2hours[/tex]

The time after which the concentration of [tex]SO_2Cl_2[/tex] fall to 12.5% of its initial value is 26.2 hours

a. 627.1 m/s

b.  the rate of effusion of ethane = 1.7 faster than hexane

Given

T = 200 + 273 = 473 K

Required

a. the gas speed

b. The rate of effusion comparison

Solution

a.

Average velocities of gases can be expressed as root-mean-square averages. (V rms)  

[tex]\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}[/tex]

R = gas constant, T = temperature, Mm = molar mass of the gas particles  

From the question  

R = 8,314 J / mol K  

T = temperature  

Mm = molar mass, kg / mol  

Molar mass of Ethane = 30 g/mol = 0.03 kg/mol

[tex]\tt v=\sqrt{\dfrac{3\times 8.314\times 473}{30} }=627.1~m/s[/tex]

b. the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

M₁ = molar mass ethane =30

M₂ =  molar mass hexane = 86

[tex]\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{86}{30} }=1.7[/tex]

the rate of effusion of ethane = 1.7 faster than hexane

Answer:

Sn, Sb, Te, Ga, As

Explanation:

Answer:

C. 1.5 m copper(II) sulfate(aq)

Explanation:

I say this because a copper is a metal and a metal always has the highest melting and boiling point. A metal is also malleable, can dissolve in water, and a good conductor of electricity. All the other answers have all the nonmetals in them like Carbon, Oxygen, Chlorine, and etc. Nonmetals do not have a high boiling point. They basically are brittle. Therefore, the final answer is C.

Answer:

B. an atom of oxygen o is destroyed in the reaction

Answer:

C

Explanation:

The Law of Conservation of Mass states that matter cannot be created or destroyed and must be conserved. I is stating matter cannot be created, which is true. II is saying that matter can only be rearranged/conserved, which again is true. III states matter cannot be destroyed, which is also true. IV is incorrect because it doesn't make sense. Matter does matter.

Answer:

It's considered a limited resource because there is a limited amount of freshwater found on Earth's surface. Explain why the amount of water per person differs between countries. It differs because in the different countries it is distributed unevenly.

Explanation:

looked it up

Answer:

63 moles of carbon atoms, 115.5 moles of hydrogen atoms, and 57.75 moles of oxygen atoms i believe :)

Answer:

13.749 x 10 -3 g

Explanation:

take the number of atoms that you have divided by Avogadro's number and then multiply by the molar mass of the element. :)

Answer:

4.59 grams of hydrogen

Explanation:

57.010 g of ammonium phosphate * 1 mol / 149 g of ammonium phosphate * 12.0 g H * / 1 mol = 4.591409396.

But with sig figs, it rounds to 4.59.

So the final answer is 4.59 grams of hydrogen.

4.59g is the  mass of hydrogen in 57.010 grams of ammonium hydrogen phosphate. A mole is just a measuring scale.

A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. Using absolute amounts of atoms, molecules, or ions would be problematic as well since chemical reactions frequently occur at levels that use grams would be inappropriate.

A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.

57.010 g of ammonium hydrogen phosphate× 1 mol / 149 g of ammonium phosphate ×12.0 g H× / 1 mol = 4.59g of hydrogen

Therefore, 4.59g is the  mass of hydrogen in 57.010 grams of ammonium hydrogen phosphate.

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Answer:

I think scientists should not clone the wooly mammoth because our environment is already working great without them and bringing them back has a chance to hurt the environment or even destroy it also wooly mammoths were exists about 3700 years ago and the world had changed A LOT from then so we could end up hurting the mammoth by putting it in a world that has changed a lot from when the wooly mammoth was actually alive.

Answer:

The rise and fall of the tides. Tides create a current in the oceans, which are strongest near the shore, and in bays and estuaries along the coast.

Winds drive currents that are at or near the ocean's surface.

Thermohaline circulation. This is a process driven by density differences in water due to temperature (thermo) and salinity variations in different parts of the ocean. Currents driven by thermohaline circulation occur at both deep and shallow ocean levels and move much slower than tidal or surface currents.

Currents affect the Earth's climate by driving warm water from the Equator and cold water from the poles around the Earth.

Explanation:

hope this helps

Answer:

C) The products have more energy stored in their chemical bonds.

Explanation:

In such reactions that absorb energy, the products have more energy stored in their chemical bonds.

For endothermic changes, heat is absorbed from the surrounding hence the surrounding becomes colder at the end of the changes.

The heat energy level of the products is higher than that of the reactants.

Answer:

Hi... Your answer is 10*50=500

Answer:

50x10 = 500 ; 500/5 = 100 watts

Explanation:

W/t /Force x Distance

the power is equal to the work done to the object divided by time.

Answer:

the answer is the second one.