The compound ammonium bromide is a strong electrolyte. Write the reaction when solid ammonium bromide is put into water:

Answer:

A

Explanation:

Dilution of the solution can be calculated by the formula of the molarity and volume. The initial volume of 2.50 M solution was 30 mL.

Molar concentration or the dilution factor is in an inverse relationship and with an increase in the dilution, the molarity of the solution decreases.

Given,

Initial molarity = 2.50 M

initial volume = ?

Final molarity = 0.750 M

Final volume = 100.0 ml

Substituting values in the formula:

[tex]\begin{aligned}\rm V_{1} &= \rm \dfrac{M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.750 \times 100}{2.50}\\\\&= 30 \;\rm mL\end{aligned}[/tex]

Therefore, 30 mL was the initial volume of the solution before it was diluted.

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Answer:

5.66667

Explanation: because you have to take 12 and see how many times it fits into 68. Hope this helps! :^)

Answer:

In 1932, the physicist James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium. The resulting radiation showed high penetration through a lead shield, which could not be explained via the particles known at that time.

Explanation:

Answer:

a. 9.00 x 1013 J

Explanation:

Trust me

Answer:

2+1=1+4

Explanation:

2h2so4+1pb(oh)4=1pb(so)4+4h2o

The more matter you place into a defined

volume, the denser it becomes. Therefore they have the same density because (Mass is the amount of matter in a object)

Answer:

The answer is Venus. So B

Answer:

29.596 g/cm^3

Explanation:

mass=density*volume=9.8*3.02=29.596

The concentration, in grams per liter, of a solution prepared by dissolving 0.00040 mol HCl in 2.2L H₂O is 0.0066 g/L.

Mass of any substance will be calculated by using their moles as:
n = W/M, where

W = required mass

M = molar mass

GIven moles of HCl = 0.00040 mole

Mass of 0.00040 mole of HCl will be calculated as:

W = (0.00040mol)(36.45g/mol) = 0.01458g

Given volume of Water = 2.2 L

Now the concentration in molality (g/L) will be calculated as:

concentration = (0.01458g) / (2.2L) = 0.0066 g/L.

Hence required concentration is 0.0066 g/L.

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Answer: first one is 0.0066 and second one is 6.6

Explanation:

I got it right

The more the number of particles the better the frost protection hence, salt offers a better frost protection than sugar.

The term frost protection has to do with protection agianst the accumulation of frost or snow.

We have to note that this property depends on the ability of the substance to decrease the melting point of ice. The more the number of particles the better the frost protection hence, salt offers a better frost protection than sugar.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 2.49 g

density = 6.26 g mL-1

So we have

[tex]volume = \frac{2.49}{6.26} \\ = 0.397763578...[/tex]

We have the final answer as

Hope this helps you

Answer:

E = hf

E = hc/lamda

where E-energy,

h-planck's constant (6.62 x 10^-34 Js)

f- frequency ( f = c/lamda)

c-velocity of light ( 3 x 10^8 m/s)

lamda- wavelength

you can this formula to solve all the 4 questions.

The answer is 2.53e-5, I unfortunately don't know how you would really show the work other than showing the division.

Answer:

hydrogen

Explanation:

it diffuses faster compared to helium since it is less dense

Answer:

Hydrogen

Explanation:

It is lighter than helium

Answer:

[tex]\huge\boxed{\sf 39\ L}[/tex]

Explanation:

In the reaction:

for 1 mol of propane, 3 moles of CO₂ are produced.

Volume of propane = 13 L

At STP,

1 mol of propane = 22.4 L/dm³ molar value

So,

Moles in 13 L of propane:

= volume / molar volume

= 13 / 22.4

= 0.58 mol

Since,

1 mol of propane = 3 moles of CO₂

0.58 mol of propane = 3 × 0.58 mol of CO₂

0.58 mol of propane = 1.74 mol of CO₂

Converting 1.74 mol of CO₂ into L:

[Multiply it by 22.4 L/mol]

= 1.74 mol × 22.4 L/mol

= 39 L

[tex]\rule[225]{225}{2}[/tex]

Answer:

Explanation:

Fe⁺² (aq) + 2e⁻ =   Fe (s)   ;   E⁰ =  - .44 V

Fe⁺³ (aq) + e⁻ =  ® Fe²⁺ (aq) ;   E⁰ = + .77 V

Reduction potential of second reaction is more , so it will take place , ie Fe⁺³ will be reduced and Fe will be oxidised .

So reaction in the combined cell will be

2Fe⁺³ + Fe = 3Fe⁺²

cell potential = .77 - ( - .44 )

= 1.21 V .

At constant temperature, if the volume of the unknown gas drops to the given value, the pressure increases to 20.0atm.

Given the data in the question;

Final pressure of the unknown gas; [tex]P_2 = \ ?[/tex]

Boyle's law simply states that the volume V of any given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.

Boyle's law is expressed as;

[tex]P_1V_1 = P_2V_2[/tex]

Where [tex]P_1[/tex] is Initial Pressure, [tex]V_1[/tex] Initial volume, [tex]P_2[/tex] is Final Pressure and [tex]V_2[/tex] is Final volume.

We substitute our given values into the expression above to determine the final pressure.

[tex]P_1V_1 = P_2V_2\\\\P_2 = \frac{P_1*V_1}{V_2} \\\\P_2 = \frac{2atm\ * 7L}{0.7L} \\\\P_2 = \frac{2atm\ * 7}{0.7}\\\\P_2 = \frac{14atm}{0.7}\\\\P_2 = 20.0atm[/tex]

Therefore, at constant temperature, if the volume of the unknown gas drops to the given value, the pressure increases to 20.0atm.

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Answer:

Water has a density of 1 g/m so it could be sometimes true

Explanation:

Answer:True

Explanation: If you look it up it says the anwser. Can you give me a thank and a five.

Also very important if you put your question in the search bar and put quizlet after then you can find answer for you test quizes and more.

I hope this helps you and have a great day bye.

Answer:

bromine atomic number =35

1s²2s²2p^6 3s² 3p^6 4s² 3d^10 4p^5.

Answer:

120 g is the answer I think

The new molarity of the solution is 0.5M.

The molarity of a solution can be calculated by using the following expression:

C1V1 = C2V2

Where;

According to this question, a chemist dilutes 2.0 L of a 1.5 M solution with water until the final volume is 6.0 L.

1.5 × 2 = 6 × C2

3 = 6C2

C2 = 3/6 = 0.5M

Therefore, the new molarity of the solution is 0.5M.

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Answer:

b

Explanation:

In an ecosystem, the  ozone depleting substance  is chlorofluorocarbon or the CFC's.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems.

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Time to decay : 2040 years

Further explanation  

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

The main particles are emitted by radioactive elements ,so that they generally decay, are alpha (α), beta (β) and gamma (γ) particles  

General formulas used in decay:  

[tex]\tt Nt=No.\dfrac{1}{2}^{\dfrac{T}{t\frac{1}{2} }[/tex]  

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

moles zirconium :

[tex]\tt \dfrac{15.4}{91}=0.169[/tex]

moles niobium :

[tex]\tt \dfrac{2.2}{91}=0.0242[/tex]

the half-life of niobium-91 is 680 years

Reaction

⁹¹₄₁Nb ⇒⁹¹₄₀Zr + ₁⁰e

Amount of Nb from reaction : 0.169

Amount of initial Nb = 0.0242 + 0.169 = 0.1932

Time to decay (T) :

[tex]\tt 0.0242=0.1932.\dfrac{1}{2}^{\dfrac{T}{680}}\\\\0.1252=\dfrac{1}{2}^{\dfrac{T}{680}}\\\\\dfrac{1}{2}^{3}=\dfrac{1}{2}^{\dfrac{T}{680}}\\\\T=680\times 3=2040[/tex]

Answer:

It’s CCCCCCCCCCCCCCC

Explanation:

I just took the instruction and yes its “C.”

Answer:

1)electrons

2)protons, neutrons

Explanation:

please mark me as brainlest

Answer:

1 . c

2. a , b

Explanation:

1 . the electrons spin around the nucleus of an atom

2. the protons and neutrons are located in the orbit of an atom

Answer:

physical property

Explanation: