Which of the following is a possible pH for distilled water that has lime (a base) dissolved in it?
a. 1
b. 3
c. 7
d. 9

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: 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

Answer:

infared radiation

Explanation:

Answer:

infared radiation

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:

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:

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  .

Answer:

flow of electrons between the electrolytes and the electrodes

Answer:

hydrogen

Explanation:

it diffuses faster compared to helium since it is less dense

Answer:

Hydrogen

Explanation:

It is lighter than helium

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

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 .

Answer:

A

Explanation:

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.

Considering the Dalton's partial pressure, the partial pressure of nitrogen in the tank is 41 atm.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

[tex]P_{T} =P_{1} +P_{2} +P_{3} + ... +P_{n}[/tex]

where n is the amount of gases present in the mixture.

This relationship is due to the assumption that there are no attractive forces between the gases.

In summary, the total pressure in a mixture of gases is equal to the sum of partial pressures of each gas.

In this case, the total pressure of the gas mixture is calculated as:

[tex]P_{T} =P_{oxygen} +P_{helium} +P_{nitrogen}[/tex]

You know that:

Replacing in the expression for the total pressure:

[tex]180 atm=81 atm+58 atm+P_{nitrogen}[/tex]

Solving:

180 atm -81 atm -58 atm= [tex]P_{nitrogen}[/tex]

41 atm= [tex]P_{nitrogen}[/tex]

Finally, the partial pressure of nitrogen in the tank is 41 atm.

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Answer:

4,256

if not that then 42,560

Explanation:

Answer:

bromine atomic number =35

1s²2s²2p^6 3s² 3p^6 4s² 3d^10 4p^5.

Answer:

120 g is the answer I think

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.”

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 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:

1.potential

2. Kinetic

3. Potential

4. I think is potential because it is storing the energy but if is a crank flashlight it is kinetic.

Explanation:

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:

[tex]\huge\boxed{\sf 49.41\ L}[/tex]

Explanation:

In the reaction:

for every 3 moles of H₂, 2 moles of NH₃ are produced.

Converting 25 g of Ammonia into moles:

Moles = mass / molar mass

= 25 / (14 + 1 × 3)

= 25 / (14 + 3)

= 25 / 17

= 1.47 mol

From the reaction:

2 NH₃ = 3 H₂

1 NH₃ = 3/2 H₂

1 NH₃ = 1.5 H₂

1.47 mol of NH₃ = 1.5 × 1.47 mol of H₂

1.47 mol of NH₃ = 2.2 mol of H₂

So, 2.2 mol of H₂ are needed to produce 1.47 mol (25 g) of NH₃

Converting 2.2 mol of H₂ into L:

= mole × molar value

[molar value = 22.4 L/mol]

= 2.2 × 22.4

= 49.41 L

[tex]\rule[224]{225}{2}[/tex]

Auroras present in polar regions.

Answer:

the Northern Lights

Explanation:

The northern lights, one of several astronomical phenomena called polar lights (aurora polaris), are shafts or curtains of colored light visible on occasion in the night sky. Aurora borealis

hope this helps

Answer:

It is a heterogeneous mixture

A B & E

If you look at the balancing you'll see that C & D are balanced incorrectly.

The reactions A, B, and E follow the law of conservation of mass. So the correct options are A, B, and E.

According to the rule of conservation of mass, matter cannot be generated or destroyed in a closed or isolated system. It is preserved yet capable of changing forms.

The rule of conservation of mass, which applies to the study of chemistry, states that the mass of the reactants and products in a chemical reaction must be equal.

To be clear: A system that is isolated from its environment is one that does not interact with it. As a result, no matter what changes or chemical reactions take place in that isolated system, the mass will remain constant; even if the final state may differ from the initial state, there can be no more or less mass than there was before the change or reaction.

Therefore the correct options are A, B, and E.

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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: