R (c) Use particle theory of matter and explain the following observations (i) An inflated balloon expands and eventually bursts on leaving it exposed to sunshine (ii) An inflated balloon eventually shrinks when left on a cemented floor for 3 days. (iii) You can easily squeeze a plastic gas syringe that is completely filled with air, than squeezing the one, which is filled with water.​

To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

Answer:

Protons i think.

Explanation:

Answer:

C- transforemed or changed

Explanation:

matter can be changed by application of heat or cold

Answer:

D

Explanation:

there are 5 electrons in the outer shell of the first picture

According to electronic configuration, model 1 shows 5 electrons in the outer shell of the atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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The weight percentages of sodium chloride is 23.1 % and water is 76.9 % in the solution. The theoretical density of the initial concentrated solution is 0.30 g/mL.

The mass of the sodium chloride = 30 g

The mass of the water = 100 mL = 100 g

The total mass = 30 + 100

                         = 130 g

The mass percentage of sodium chloride = (30 / 130 ) × 100 %

                                                                        = 23.1 %

The weight percentage of the water = ( 100 / 130 ) × 100 %

                                                             = 76.9 %

The density of the solution = mass / volume

                                             = 30 / 100

                                            = 0.30 g/mL

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Answer:

City B has the larger annual temperature range

Explanation:

This is correct option because generally the northern side of the equator is high in temperature than the southern hemisphere part.

Since the southern side of the equator or Southern Hemisphere, where city A resides will generally have higher altitude or rise, so this creates higher average temperature.

Answer:polyatomic molecules

Explanation:molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.Characteristics of molecules

The division of a sample of a substance into progressively smaller parts produces no change in either its composition or its chemical properties until parts consisting of single molecules are reached. Further subdivision of the substance leads to still smaller parts that usually differ from the original substance in composition and always differ from it in chemical properties. In this latter stage of fragmentation the chemical bonds that hold the atoms together in the molecule are broken.

Answer:

weight of hydrogen÷eq weight of hydrogen=weight of metal÷equivalent weight of metal

yo formula lagayera nikalne

yesma pressure ko kei kaam hunna

Answer:

Hii,kusha

ek problem hó rahi hai mujhe

The mass of 872 ml of ethylene glycol is 972.92g and the volume of 2.45 mg of ethylene glycol is 0.0022ml

To calculate the mass of 872 ml of ethylene glycol, we multiply the volume by its density:

mass = density x volume

mass = 1.11 g/ml x 872 ml

=> 972.92 g

So, the mass of 872 ml of ethylene glycol is 972.92 g.

To calculate the volume of 2.45 mg of ethylene glycol, we need to know its density. Since we have the density (1.11 g/ml), we can use the following formula:

mass = density x volume

volume = mass / density

First, we need to convert 2.45 mg to g, so we divide by 1000:

mass (g) = 2.45 mg / 1000 = 0.00245 g

Now we can calculate the volume:

volume = 0.00245 g / 1.11 g/ml = 0.0022 ml

So, the volume of 2.45 mg of ethylene glycol is 0.0022 ml.

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The value of ΔG at 298 K for a reaction mixture containing 1.9 atm N2, 1.6 atm H2, and 0.65 atm, the answer is (a) -3.86 × 10^3.

NH3 can be calculated using the equation:

ΔG = ΔG° + RT ln(Q)

where ΔG is the standard Gibbs free energy change, ΔG° is the standard Gibbs free energy change at standard conditions, R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient.

In this case, we are given ΔG° as -33.3 kJ/mol. To calculate Q, we need to use the partial pressures of the gases in the reaction mixture. The reaction stoichiometry tells us that the ratio of the partial pressures of N2, H2, and NH3 is 1:3:2. Therefore, we can write:

Q = (P(NH3))^2 / (P(N2) * P(H2)^3)

Plugging in the given values of P(N2) = 1.9 atm, P(H2) = 1.6 atm, and P(NH3) = 0.65 atm, we can calculate Q. Then, using the value of R = 8.314 J/(mol·K) and the temperature T = 298 K, we can substitute these values into the equation and solve for ΔG.

The calculated value of ΔG at 298 K for the given reaction mixture is approximately -3.86 × 10^3 J/mol. This value is equivalent to -3.86 kJ/mol. Therefore, the answer is (a) -3.86 × 10^3.

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Based on the average atomic mass, the abundance of isotope Tl-203 is 40.5%.

If we designate the abundance of Tl-203 as X and the abundance of Tl-205 as Y, we know the following:

X + Y = 1

203 * X + 205 * Y = 204.19

We can solve this in the following manner:

Y = 1 - X

203 * X + 205 * (1 - X) = 204.19

203 * X + 205 - 205 * X = 204.19

205 - 204.19 = 205 * X - 203 * X

0.81 = 2 * X

X = 0.81 / 2

X = 0.405

So the fraction of the lighter isotope (Tl-203) is 0.405 (or 40.5%).

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Amines are generally characterized by their solubility in dilute acid solutions due to their basic nature and ability to form salts. Amines, which contain a nitrogen atom with a lone pair of electrons, can act as Lewis bases by donating their electron pair to a proton (H+).

When an amine reacts with a dilute acid, a proton from the acid is transferred to the nitrogen in the amine, forming a positively charged ammonium ion (NH4+). This process is called protonation.

The resulting ammonium salt is soluble in water due to its ionic nature, allowing it to dissociate into its respective ions (NH4+ and the counter anion from the acid). The presence of these ions increases the solubility of the compound in water, which is a polar solvent, as polar solvents tend to dissolve ionic compounds.

The solubility of amines in dilute acid solutions is therefore a consequence of their basic properties, their ability to form salts through protonation, and the resulting increase in solubility of the ammonium salts in polar solvents like water.

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Part A : This assumption is incorrect because the concentration of H⁺ ions is actually higher than the concentration of HI due to the complete dissociation of the acid.

Part B : The correct pH of the 1.0 x 10⁻⁷ M HI solution is 7.

Part A: The calculation of pH is based on the concentration of H⁺ ions in a solution. In the case of HI (hydroiodic acid), it is a strong acid that dissociates completely in water to produce H⁺ ions. However, the student mistakenly assumes that the concentration of H⁺ ions is equal to the concentration of HI. This assumption is incorrect because the concentration of H⁺ ions is actually higher than the concentration of HI due to the complete dissociation of the acid.

Part B: To calculate the correct pH, we need to consider the concentration of H⁺ ions. Since HI is a strong acid, it dissociates completely, resulting in an equal concentration of H⁺ ions. Therefore, the concentration of H⁺ ions in the solution is also 1.0 x 10⁻⁷ M.

pH is defined as the negative logarithm (base 10) of the H⁺ ion concentration. Therefore, we can calculate the pH using the formula:

pH = -log[H⁺]

pH = -log(1.0 x 10⁻⁷)

pH = -(-7)

pH = 7

The correct pH of the 1.0 x 10⁻⁷ M HI solution is 7.

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Answer: C

Explanation:

NaOH is added to the solution, it will therefore precipitate out first, followed by Fe(OH), Al(OH), and Cr(OH)3 in that sequence.

This issue asks us to choose which metal hydroxide will precipitate out first as NaOH is gradually added to an aqueous solution with a 0.05 M concentration from a list of metal ions.

We must compare the solubility product constants (Ksp) of the metal hydroxides that each ion in the solution forms in order to find the answer.

The first metal hydroxide to precipitate out has the lowest Ksp number. We discovered that Zn(OH)2 has the lowest Ksp value among the provided metal hydroxides after comparing the Ksp values of the metal hydroxides. As NaOH is added to the solution, it will therefore precipitate out first, followed by Fe(OH), Al(OH), and Cr(OH)3 in that sequence.

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The correct statement about the Big Bang Theory is D) It is a scientific theory because it is a widely accepted explanation of nature. The Big Bang Theory is a scientific theory that describes the origin and evolution of the universe.

The correct statement about the Big Bang Theory is D) It is a scientific theory because it is a widely accepted explanation of nature.

The Big Bang Theory is a scientific theory that describes the origin and evolution of the universe. It is based on extensive observational evidence, such as the observed redshift of galaxies, the cosmic microwave background radiation, and the abundance of light elements in the universe. These pieces of evidence support the idea that the universe began with a hot, dense state and has been expanding and evolving over billions of years.

As a scientific theory, the Big Bang Theory is subject to scientific scrutiny and can be modified or refined based on new evidence or observations. However, it is widely accepted within the scientific community due to the extensive empirical support and its ability to explain a range of cosmological phenomena.

Therefore, option D is the correct statement regarding the nature of the Big Bang Theory as a widely accepted scientific explanation of the universe's origin and evolution.

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Note The Complete Question

The Big Bang Theory states that the universe started with an explosion and expanded over the next few billion years.

Which statement is correct about the Big Bang Theory?

A)It is an everyday life theory because it is based on observation.

B)It is a scientific theory because it cannot be changed or replaced.

C)It is an everyday life theory because it is not supported by evidence.

D)It is a scientific theory because it is a widely accepted explanation of nature

The molarity of the 10.0% CaCl₂ solution is 0.9007 M

Molarity of a solution is defined as the number of moles of solute present in 1 litre of the solution.

To calculate the molarity of the CaCl₂ solution, we need to first determine the mass of CaCl₂ present in one liter i.e. 1000 ml of the solution.

A 10.0% CaCl2 solution means that 10.0 g of CaCl₂ is present in 100 g of the solution.

We can use this information to calculate the mass of CaCl2 in one liter of the solution as follows:

Mass of CaCl₂ in 1 L

= (10.0 g CaCl₂ / 100 g solution) x (1000 g solution / 1 L solution)

∴ Mass of CaCl₂ in 1 L = 100 g CaCl₂ / 1 L solution

Now since we know the mass of CaCl₂ in one liter of the solution, we can use the molarity formula to calculate the molarity of the solution:

Molarity = moles of solute / volume of solution (in liters)

To find the moles of CaCl₂ present in one liter of the solution, we need to divide the mass of CaCl₂ by its molar mass.

The molar mass of CaCl₂ is 110.98 g/mol

moles of CaCl₂ in 1 L

= 100 g CaCl₂ / 110.98 g/mol

= 0.9007 mol

Finally, we can use the formula for molarity to calculate the molarity of the solution:

Molarity = moles of solute / volume of solution in L

Molarity

= 0.9007 mol / 1 L

= 0.9007 M

Thus, molarity of the solution is 0.9007 M

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Answer:

D. The water enters an aquifer through infiltration.

Explanation:

Hope it helps you:)

would you like to be my friend?:)

Answer:

protons(positively charged) and the neutrons (no charge)

Explanation:

Answer:

The nucleus of an atom contains protons and neutrons.

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged)

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Hey there!:

Mass = 0.6 g

Density = 0.0012 g/mL

Volume = ??

Therefore :

Density = mass / Volume

0.0012 = 0.6 / V

V = 0.6 / 0.012

V = 500 mL

Hope this helps!

Answer:

Fluorine:non-metal

Bromine:non-metal

Hydrogen:non-metal

Beryllium:metal

Nitrogen:non-metal

After two half-lives have passed, 200,000 atoms would remain. The half-life of a radioactive substance is the amount of time it takes for half of the substance to decay.

First, we need to understand what a half-life is. The half-life of a radioactive substance is the amount of time it takes for half of the substance to decay. So, after one half-life has passed, half of the original substance will remain, and half will have decayed.

For example, if you start with 800,000 atoms and the half-life of the substance is 10 days, after 10 days you would have 400,000 atoms remaining and 400,000 would have decayed.

After two half-lives have passed, we can apply the same logic. If the half-life of the substance is 10 days, then after 20 days (2 x 10 days), two half-lives have passed.

So, starting with 800,000 atoms:

- After one half-life (10 days), you would have 400,000 atoms remaining
- After two half-lives (20 days), you would have 200,000 atoms remaining

Therefore, after two half-lives have passed, 200,000 atoms would remain.

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Answer:

no bueno

Explanation:

Moles of AlCl_3

\(\\ \tt\hookrightarrow \dfrac{352}{133}=2.64mol\)

Now

\(\\ \tt\hookrightarrow 4.2=\dfrac{2.64}{V}\)

\(\\ \tt\hookrightarrow V=0.62L\)

Answer:

cells arose from preexisting cells

Explanation:

Rudolph Virchow is a German biologist that built on the work of other scientists such as Theodor Schwan to contribute his own quota to the development of the cell theory as it is currently known.

After several studies, Virchow rejected the idea of spontaneous generation and accepted the initially rejected idea of cell division. He earlier believed that cell division only takes place is some special type of cells and not in all cells.

Even though Virchow was not the first to bring the idea of cells arising from preexisting cells, he was the one that popularized the idea and added it to the earlier belief that all living organisms are made up of cells.

Answer:

B

Explanation:

The molar mass of the unknown non-electrolyte solute is 19.47 g/mol.

The boiling point elevation can be used to calculate the molality of the solution, which is defined as the number of moles of solute per kilogram of solvent. This can then be used to calculate the molar mass of the solute.

The formula for boiling point elevation is:

ΔTb = Kb x molality

where ΔTb is the change in boiling point, Kb is the boiling point elevation constant for the solvent, and molality is the number of moles of solute per kilogram of solvent.

First, we need to calculate the molality of the solution:

molality = ΔTb / Kb

molality = (82.1°C - 76.5°C) / 4.95 K/m

molality = 0.0177 m

Next, we can calculate the number of moles of solute in the solution:

moles = molality x mass of solvent

moles = 0.0177 m x 50.0 g / 1000 g/kg

moles = 0.88 g

Finally, we can calculate the molar mass of the solute:

molar mass = mass of solute / moles

molar mass = 17.08 g / 0.88 moles

molar mass = 19.47 g/mol

Therefore, the molar mass of the unknown non-electrolyte solute is 19.47 g/mol.

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