It was suggested that, because of the jump in numbers, from chlorine to potassium, there was an element missing between them. Which element was discovered between these elements?

Answer:

the answer to this is 74 :)

Answer: mP

Explanation:

Maritime polar forms cold water and the weather is cold and wet.

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Answer: The volume of given ball is 21 L.

Explanation:

Given : Pressure = 1.0 atm,      no. of moles = 0.85 mol

Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]

According to the ideal gas equation, formula used is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\1.0 atm \times V = 0.85 mol \times 0.0821 Latm/mol K \times 298 K\\V = 21 L[/tex]

Thus, we can conclude that the volume is 21 L.

Answer:

This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat). Magnesium is also capable of reducing water to the highly-flammable hydrogen gas, which will be ignited by the excess heat given by the reduction reaction.

Explanation:

Answer:

C

Explanation:

The amount of energy in radio active decay will be released  2.25 × [tex]10^{17}[/tex]J.

The process of radioactive decay is the loss of energy through radiation from an unstable atomic nucleus. The term "radioactive" refers to a substance that contains unstable nuclei.

Calculation of energy which released in radioactive decay.

Given data:

M =  0.025 kg

E = ?

Energy of the radioactive decay can be determined by using the formula:

E= m[tex]c^{2}[/tex]

where, E is energy , m is mass and c is speed of light.

Put the value of given data in above equation.

E = (0.025) ×(3×[tex]10^{8}[/tex])∧2J

E = 0.025 × 9  × [tex]10^{18}[/tex].J

E = 0.225 ×  [tex]10^{18}[/tex].J

E= 2.25 × [tex]10^{17}[/tex]J

Therefore, The amount of energy in radio active decay will be released  2.25 × [tex]10^{17}[/tex]J.

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Respuesta:

2.17 × 10⁻³ g/cm³

Explicación:

Paso 1: Información provista

Paso 2: Convertir 64 °C a Kelvin

Usaremos la siguiente fórmula.

K = °C + 273.15 = 64 °C + 273.15 = 337 K

Paso 3: Calcular V₂

Usaremos la ecuación combinada de los gases ideales.

P₁ × V₁ / T₁ = P₂ × V₂ / T₂

V₂ = P₁ × V₁ × T₂ / T₁ × P₂

V₂ = 96.4 kPa × 969 cm³ × 273.15 K / 337 K × 100 kPa = 757 cm³

Paso 4: Calcular la densidad del gas a  TPE

A TPE, 1.64 g del gas ocupan 757 cm³.

ρ = 1.64 g/757 cm³ = 2.17 × 10⁻³ g/cm³

The answer is option C

Explanation:

Al= 26.982

2 moles of aluminium wad given so

2× 26.982= 53.96 grams

Answer:

Practical significance refers to the magnitude of the difference, which is known as the effect size. Results are practically significant when the difference is large enough to be meaningful in real life. ... Very small differences will be statistically significant with a very large sample size.

Explanation:

Hope it helps

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Explanation:

The particles of matter are continuously in motion due to which tehy collide with each other, and this creates a vibration in the solids

I hope it is correct ☺️

Answer:

the periodic table is G.

The periodic table has the elements placed in the locations that match the information on the flash cards is F.

The term "periodic table" refers to an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes. The periodic table is organized into 118 elements.

The term "periodic table" can also refer to a table that lists all known chemical elements in rows and columns.

In the F table, L is found in alkaline earth metals while M is found in transition metals. M has more valence electrons than L, while L is more reactive than M.

Thus, the  periodic table has the elements placed in the locations that match the information on the flash cards is F.

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Answer:

1.3 M/s

Explanation:

Step 1: Given data

Step 2: Calculate the average rate of consumption of methane

Methane burns in excess oxygen according to the following equation.}

CH₄ + 2 O₂ ⇒ CO₂ + 2 H₂O

We can calculate the average rate of consumption of methane (r) using the following expression.

r = - Δn/V × t = - (nf- ni) / V × t

r = - (0 mol - 8.0 mol) / 2.00 L × 3.2 s = 1.3 M/s

Answer:

gas

Explanation:

particles are very far apart

The given diagram represents gaseous state of matter.  Both a volume and a definite form are absent from a gas. The separation of gas particles is great.

Solids, liquids, gases, plus plasma are the four states of matter that may be found in daily life. However, a number of additional states of matter have indeed been found.

Some of these additional states are created when a material transitions among two states of matter and doesn't actually exhibit the characteristics of either state. The most exotic are others. Both a volume and a definite form are absent from a gas. The separation of gas particles is great. The gas in a balloon and the air are two examples of gases. The given diagram represents gaseous state of matter.

Therefore, the given diagram represents gaseous state of matter.

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Answer:

700

Explanation:

How to find

Multiply the volume and pressure and divide the product by the temperature and the molar gas constant to calculate the moles of the hydrogen gas.

Solve: 204.83 × 27.88 / 8.76 = 651.901872146

Which is 651.90

In the nearest hundredths, the moles of gas is 700

Among all the given options, option d is correct options. Fossil fuels developed from the organic remnants of ancient plants and animals.

Fossil fuels are vital natural resources, as is widely known. They provide significant benefits to humanity, and we depend on them for energy. However, using fossil fuels has drawbacks as well.

Fossil fuels developed from the organic remnants of ancient plants and animals. The heat and pressure of the crust caused Earth to transform these million-year-old leftovers into fuels that include carbon.

The need for energy only increased after the Industrial Revolution. Similar to that, these fuels have had the ability to generate enormous amounts of energy to meet this need.

Therefore, the correct option is option D.

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Answer:

1.7x10²³ Fluorine atoms are present

Explanation:

To solve this question we must know that, to find the amount of atoms of a substance from its mass, we have, as first, to convert this mass to moles using molar mass of the substance. With the moles we can find the amount of molecules using Avogadro's number. And with the formula we can know the atoms presents:

Moles Fluorine (F₂, Molar mass: 37.997g/mol)

5.3g * (1mol / 37.997g) = 0.139 moles F₂

Molecules F₂:

0.139 moles F₂ * (6.022x10²³molecules / mol) = 8.4x10²² molecules F₂

As 1 molecule of F₂ contains 2 atoms of Fluorine:

8.4x10²² molecules F₂ * 2 =

Answer:

The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.

Explanation:

pH, short for Hydrogen Potential, is a measure used to establish the level of acidity or alkalinity of a solution.

pH indicates the amount of hydrogen ions present in a solution or substance. Mathematically the pH is the negative logarithm of the molar concentration of hydrogen ions or protons (H⁺) or hydronium ions (H₃O⁺).

pH= - log [H⁺]= - log [H₃O⁺]

The pH scale goes from 0 to 14. Values ​​less than 7 indicate the range of acidity and those greater than 7 indicate alkalinity or basicity. The value 7 is considered neutral.

In this case, [H₃O⁺]= 0.001 M.

Replacing in the definition of pH:

pH= - log (0.001 M)

Solving:

pH= 3

The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.

The equilibrium constant of this reaction can be called the solubility product and is written as; Ksp = [Na^+] [Cl^-]

The term equilibrium constant refers to the number that shows the extent to which reactants are converted into products.

In this case, the equilibrium constant of this reaction can be called the solubility product and is written as; Ksp = [Na^+] [Cl^-]

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Answer:

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Explanation:

Answer:

5.12 m³

Explanation:

Using the combined gas law formula as follows:

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (m³)

V2 = final volume (m³)

T1 = initial temperature (K)

T2 = final temperature (K)

According to this question;

V1 = 5.0 m³

V2 = ?

P1 = 0.84 atm

P2 = 0.89 atm

T1 = 298 K

T2 = 323 K

Using

P1V1/T1 = P2V2/T2

0.84 × 5/298 = 0.89 × V2/323

4.2/298 = 0.89V2/323

Cross multiply

4.2 × 323 = 298 × 0.89V2

1356.6 = 265.22V2

V2 = 1356.6 ÷ 265.22

V2 = 5.12 m³

Answer:

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Explanation:

Answer: 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.

Explanation:

Given: Mass = 20 g

Change in temperature = [tex]26^{o}C[/tex]

The standard value of specific heat of water is [tex]4.184 J/ g^{o}C[/tex]

Formula used to calculate the heat energy 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 values into above formula as follows.

[tex]q = m \times C \times \Delta T\\= 20 g \times 4.184 J/g ^{o}C \times 26^{o}C\\= 2175.68 J[/tex]

Thus, we can conclude that 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.

Answer:

C. When the element is stable

Explanation:

Just answered on apx

In order to solve this, you will need to know how many moles of CaCl2 you will need, and to do so, you must look at the concentration of the solution.

You are told that the concentration of the solution is 0.19M, meaning that there is 0.19 moles of CaCl2 for every 1 liter of solution. However, you don't have 1 liter of solution, you have 445.2 mL. You must convert this to liters by dividing by 1000.

445.2 mL *  (1 L / 1000 mL) = 0.4452 L

Now, you can solve for how many moles the solution must have. Since M = mol / L and you are given M and L, you can set up an equality as follows:

0.19M = mol / 0.4452 L

Now, in order to find the number of moles, you multiply both sides by 0.4452L

0.19M * 0.4452 L = moles = 0.084588mol  

Now, you must calculate the molar mass of CaCl2 by using the periodic table

MM Ca = 40.078 g/mol

MM Cl = 35.452 g/mol

40.078 + (35.452 * 2) = 110.982 g/mol

Now you multiply the number of moles in the solution you calculated by the molar mass.

0.084588mol * 110.982 g/mol = 9.387 g CaCl2