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Name two items that are made from coconut fiber​

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:

The answer is Venus. So B

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:

A

Explanation:

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:

The number of protons is equal to the number of electrons

Explanation:

For an atom to be neutral, all the charges have to equal zero. Because protons are charged +1 and electrons are charged -1, the number of protons has to be equal to the number of electrons for the charges to cancel out.

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 .

Answer:

a. 9.00 x 1013 J

Explanation:

Trust me

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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Answer:

4,256

if not that then 42,560

Explanation:

Answer:

120 g is the answer I think

Answer:

hydrogen

Explanation:

it diffuses faster compared to helium since it is less dense

Answer:

Hydrogen

Explanation:

It is lighter than helium

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

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: The difference between these 3 isotopes is the number of neutrons.

The atomic mass of an atom is the number of protons plus neutrons. We know that the atomic number of magnesium is 12, so therefore there are 12 protons.

In Magnesium-24, there are 24-12 neutrons = 12 neutrons.

In Magneusium-25, there are 25-12 neutrons = 13 neutrons

In Magnesium-26, there are 26-12 neutrons = 14 neutrons

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

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

Answer:

1.46mol of Al2(SO4)3 weights 499.5 grams

Explanation:

First we will find the gram formula mass of Al2(SO4)3.

Al * 2 = 26.98 g/mol * 2 = 53.96 g

SO4 * 3 = 96.06 g/mol * 3 = 288.18

53.96 + 288.18 = 342.14 g

That is the mass of 1 mol of AL2(SO4)3.

Now we will multiply 342.14g by 1.46.

342.14 * 1.46 = 499.5244 g

Or ... 499.5 g

The answer will be for every 3 moles of hydrogen gas, the reaction produces 2 moles of ammonia.

For making ammonia one mole of nitrogen gas is combined with the three moles of hydrogen gas to produce two moles of ammonia.

The ratio of nitrogen, hydrogen, and ammonia is as follows 1:3:2. now if we need to produce 10 moles of ammonia for the balanced equation the ratio will become 10:30:20.

The reaction is as follow:-

[tex]\rm N_2+3H_2----- > 2NH_3[/tex]

For nitrogen

[tex]\rm N_2--- > 1\ Molecule \\\rm N_2--- > 1\ Mole\\\rm N_2--- > 28.02\ g[/tex]

For Hydrogen

[tex]\rm H_2--- > 3\ Molecules\\\rm H_2--- > 3\ Moles\\ \rm H_2--- > 3\times2.02--- > 6.06\ g[/tex]

For Ammonia

[tex]\rm NH_3--- > 2\ Molecules \\\rm NH_3--- > 2\ Moles\\\rm NH_3--- > 2\times17.04--- > 34.08\ g[/tex]

Thus the answer will be for every 3 moles of hydrogen gas, the reaction produces 2 moles of ammonia.

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Answer:

B For every 3 moles of hydrogen gas, the reaction produces 2 moles of ammonia.

Explanation: I just did it

Answer:

bromine atomic number =35

1s²2s²2p^6 3s² 3p^6 4s² 3d^10 4p^5.

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 density of gasoline is 0.68 g/cm³.

Explanation:

Given data:

Volume of gasoline = 9.00 L

Mass of gasoline = 6120 g

Density of gasoline = ?

Solution:

first of all we will convert the unit, L to mL.

9.00 L × 1000 mL / 1 L = 9000 mL

Formula:

d = m/v

d = density

m = mass

v= volume

d = 6120 g/ 9000 mL

d = 0.68 g/cm³  ( mL =cm³ )

Thus, density of gasoline is 0.68 g/cm³  .

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the correct option is option B.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

Element with atomic number 13 represents aluminium element. The element that belongs to aluminium family will have same property as aluminium. Boron is a element that have same property as aluminium.

Therefore, the correct option is option B.

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Answer:

physical property

Explanation:

Answer:

infared radiation

Explanation:

Answer:

infared radiation

Explanation:

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]