How much energy is released if a sample loses 0.025 kg mass through
radioactive decay?

Answer:

the last one

Explanation:

liquid at room temp

Answer:

A) It tends to increase from top to bottom of a group

Answer:

I think b

Explanation:

50 moles of ammonia gas are produced in the following reaction if 25 moles of nitrogen gas reacts with hydrogen. Therefore, the correct option is option C.

In the National System of Units, the mole represents the unit of substance amount. However many elementary units of a particular substance are present inside an object as well as sample is determined by the quantity of that material. There are precisely  6.022×10²³ elementary entities in a mole.

An elementary object may include an atom, any molecule, and ion, an ion pair, or perhaps a subatomic particle like an electron depending upon what the substance is. 

N[tex]_2[/tex](g) + 3H[tex]_2[/tex](g). → 2NH[tex]_3[/tex](g)

moles of nitrogen = 25 moles

the  mole ratio between nitrogen and ammonia is 1:2

moles of nitrogen = 25×2=50 moles

Therefore, the correct option is option C.

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Answer:

1. 9.57 × 10^-9 moles.

2. 7.38mol

Explanation:

1.) To find the number of moles there are in the number of particles in an atom, we divide the number of particles (nA) by Avagadro's constant (6.02 × 10^23)

Hence, to find the number of moles (n) of Manganese (Mn), we say:

5.76 x 10^15 atoms ÷ 6.02 × 10^23

5.76/6.02 × 10^(15-23)

= 0.957 × 10^-8

= 9.57 × 10^-9 moles.

2.) Mole = mass/molar mass

Molar mass of sodium chloride (NaCl) = 23 + 35.5

= 58.5g/mol

mole = 431.6 g ÷ 58.5g/mol

mole = 7.38mol

The answer is: Element B

Answer:

Hydrocarbons

Hydrocarbons are chemical compounds that contain the elements carbon and hydrogen only. They are compounds that are obtained from the fossil fuel crude oil by a process called fractional distillation.

Fractional distillation

Fractional distillation separates the crude oil mixture into a number of smaller, different parts called fractions. The fractionating column is hot at the bottom and cool at the top. Substances with high boiling points condense at the bottom and substances with lower boiling points condense on the way to the top.

The crude oil is evaporated and its vapours condense at different temperatures in the fractionating column. Each fraction contains hydrocarbon molecules with a similar number of carbon atoms, smaller molecules nearer the top and longer molecules nearer the base of the column.

Oil fractions

The diagram below summarises the main fractions from crude oil and their uses and the trends in properties. Note that the gases leave at the top of the column, the liquids condense in the middle and the solids stay at the bottom.

Explanation:

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The substances which are generally used to generate heat and light energy on burning are called fuels. The diesel fuel contains the largest molecules. Thus option A is correct.

The diesel fuel which is also called the diesel oil is found to be a combustible liquid and it is produced from the fractions of crude oil. The diesel fuel is found to be less volatile than the gasoline.

The chemical composition of a diesel fuel is usually denoted as C₁₂H₂₄. Apart from the carbon and hydrogen atoms small amounts of 'S', 'N' and 'O' are also present in the diesel.

Here gasoline is a derivative product obtained by the fractional distillation of crude oil and it is generally used in passenger vehicles whereas kerosene is a highly flammable liquid obtained from the distillation of petrol and is less volatile than gasoline.

The gasoline contains only 4 to 12 'C' atoms per molecule and it is a lightweight hydrocarbon mixture. The number of 'C' atoms in kerosene ranges from 10 to 16 per molecule and the diesel fuel is known as the heavyweight hydrocarbon mixture with 8 to 21 'C' atoms per molecule.

Thus diesel fuel consists of larger hydrocarbon molecules than gasoline and kerosene.

Thus the correct option is A - Diesel.

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Answer: The alkyne

Explanation:

Answer:

the alkyne

Explanation:

Hope it helps u

FOLLOW MY ACCOUNT PLS PLS

Equal volumes of nitrogen and oxygen, at the same temperature and  pressure, would: b. contain the same number of particles.

Avogadro's law states that, equal volumes of all gas samples have the same number of atoms or molecules at the same temperature and pressure.

In Science, the Avogadro's number is typically used to determine the number of atoms or molecules that are contained in a certain mass of a chemical element.

Note: Avogadro's constant is equal to [tex]6.02 \times 10^{23}[/tex]

In conclusion, equal volumes of nitrogen and oxygen, at the same temperature and  pressure, would contain the same number of particles (atoms or molecules) in accordance with Avogadro's law.

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Answer: 39.9 g HzF is equivalent to 0.0398 L.

Explanation:

According to the standard conversion factor,

1 gram = 0.001 L

Therefore, 39.8 g will be converted into liter as follows.

[tex]1 g = 0.001 L\\39.8 g = 39.8 g \times \frac{0.001 L}{1 g}\\= 0.0398 L[/tex]

Thus, we can conclude that 39.9 g HzF is equivalent to 0.0398 L.

Answer:

the volume is 18.45 L

Explanation:

The computation of the volume when the temperature is increased to 60.0 K is shown below:

Since the gas occupied 12.3 L at a temperature of 40.0 k

And, the volume when the new temperature is 60.0 k

So, the volume is

= 60.0 k × 12.3 L ÷ 40.0 k

= 18.45 L

hence,  the volume is 18.45 L

Answer:

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log ([ { H_3O}^{+}])[/tex]

H3O+ is the hydronium ion

From the question we have

[tex]pH = - log(3.2 \times {10}^{ - 6} ) \\ = 5.49485..[/tex]

We have the final answer as

Hope this helps you

Answer:

option d) is the correct answer

p [OH-] = -log[OH-]= -log ( 1x10^-11M) = 11

we know that

p[OH-] + p[H+] = 14

so p[H+] = 14- p[OH-] = 14- 11 = 3

pH = 3, answer

Answer: An amount of [tex]40980.48 J/g^{o}C[/tex] heat is required to raise the temperature of 4.64kg of lead from 150°C to 219°C.

Explanation:

Given: mass of lead = 4.64 kg

Convert kg into grams as follows.

[tex]1 kg = 1000 g\\4.64 kg = 4.64 kg \times \frac{1000 g}{1 kg}\\= 4640 g[/tex]

[tex]T_{1} = 150^{o}C[/tex]

[tex]T_{2} = 219^{o}C[/tex]

The standard value of specific heat of lead is [tex]0.128 J/g^{o}C[/tex].

Formula used to calculate heat is as follows.

[tex]q = m \times C \times \Delta T[/tex]

where,

q = heat energy

m = mass of substance

C = specific heat of substance

[tex]\Delta T[/tex] = change in temperature

Substitute the value into above formula as follows.

[tex]q = m \times C \times \Delta T\\= 4640 g \times 0.128 J/g^{o}C \times (219 - 150)^{o}C\\= 40980.48 J/g^{o}C[/tex]

Thus, we can conclude that [tex]40980.48 J/g^{o}C[/tex] heat is required to raise the temperature of 4.64kg of lead from 150°C to 219°C.

Answer:

The pressure of the gas at 323 degrees Celsius is 2 atm.

Explanation:

Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.

Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

Where P = pressure, T = temperature, K = Constant

Having two different states, an initial state 1 and a final state 2, it is satisfied:

[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{1 atm}{298 K} =\frac{P2}{596 K}[/tex]

Solving:

[tex]P2=\frac{1 atm}{298 K}*596 K[/tex]

P2= 2 atm

The pressure of the gas at 323 degrees Celsius is 2 atm.

Answer:

3 moles of Calcium Oxide are formed

Explanation:

Based on the reaction of Calcium Ca, with oxygen, O₂, to produce calcium oxide, CaO is:

2Ca + O₂ → 2CaO

where 2 moles of calcium produce 2 moles of Calcium oxide.

That means, if 3 moles of Ca react in presence of oxygen:

3 moles of calcium oxide are formed

Answer:

La cantidad de energía disponible de una fuente de energía determinada se denomina recurso energético. La escasez de recursos energéticos (petróleo, carbón y madera) en algunas de las fuentes de energía más utilizadas plantear necesidad de usar otras fuentes investigar el modo más rentable de emplearlas

Explanation:

Answer:

false

Explanation:

its the amount of high-quality energy available from a given quantity of an energy resource minus the high-quality energy needed to make the energy available.

Answer:

The answer is c.1. The atomic number of nitrogen is 7.

The electron arrangement of nitrogen is 2.5. With that said, atom 1 resembles the neutral atom of nitrogen because the innermost shell of the atom contains 2 electrons while the outermost shell of the atom contains 5 electrons.

The model that could represent a neutral atom of nitrogen is the first one. Thus, the correct option is C.

A nitrogen atom may be defined as a chemical element with an atomic number of 7 and an atomic mass of 14.  It contains seven protons in its nucleus.

Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table. Being neutral, the number of protons that it has in its nucleus must be equal to that of the surrounding electron. Hence, the number of electrons are seven.

These seven electrons are only visible in the first model. Thus, the correct option for this question is C.

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Answer:

Avogadro's Law

Explanation:

The amount of moles is directly proportional to the volume of the gas under constant temperature and pressure. That is the statement of Avogadro's law. The equation is:

V1n2 = V2n1

Where V is volume and n are moles of 1, initial state and 2, final state of the gas

That means, right option is:

Answer: Molarity of the solution is 0.028 M.

Explanation:

Given : Moles of sucrose (solute) = 0.112 mol

Volume of solution = 4.0 L

Molarity is the number of moles of solute dissolved in a liter of solvent.

[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.112 mol}{4.0 L}\\= 0.028 M[/tex]

Thus, we can conclude that molarity of the solution is 0.028 M.

Answer:

C)9.5

Explanation:

Given poH=4.5

find ph

from 14=ph+poh

14=ph+4.5

ph=9.5

during tbe 1880s and 90s scientist searched cathode rays for the carrier of the electrical properties in matter. the person who discovered Thomson of the electron of 1897.

Answer:

we have a base-Ca(OH)2 and an acid - HNO3

→Their chemical reaction gives us water and salt Ca(NO3)+ H20 (neutralisation reaction)

the pH is expected to be acidic ... since nitric acid is a strong acid and calcium hydroxide is a weak base .

Explanation:

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Answer:

The answer would be D.

: )

Explanation:

The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

Oxygen tanks are those in which the oxygen is filled in the liquid form by giving pressure to it with the help of a piston due to more pressure the molecules of oxygen become close.

As the molecule of the oxygen gas is closed to each other they are condensed and changes their state from a gaseous state to a liquid state.

By providing more pressure to the oxygen tank the gas molecules increases due to the decrease in the surface of the tank and molecules condense to liquid form.

Therefore, The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

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Answer:

The addition of energy  through the chemical reaction when substance combines and gets decomposed.

Explanation: