explain why we must balance all chemical equations

Answer:

They are positively charged ions.

Explanation:

Though, I am not exactly sure about what do you actually mean by your question, but cations are positively charged ions.

The statements that contributes to the difference in temperature are the particles in Sample A have a higher average speed than the particles in sample B  and Each particle in sample A has more mass than each particle in sample B and the correct options are option 2 and 3.

In Kinetic Theory of Gas, we assume speed of a gas molecule to be constant at constant temperature.

If it collides with walls of the container or with other molecules, then its speed remain constant and direction reverses as collision is assumed to be elastic.

The average velocity of gas molecules is the speed at which they move around in a space. This can be affected by various factors such as temperature, pressure, and the type of gas.

The average velocity is important because it determines how fast a gas will expand or contract in response to changes in these conditions.

Thus, the ideal selections are option 2 and 3.

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CH3COOH, also known as acetic acid, is a polar molecule due to the presence of electronegative atoms such as oxygen and the polar covalent bonds between them. The intermolecular forces present in CH3COOH are hydrogen bonding and dipole-dipole interactions.

Br2, also known as molecular bromine, is a nonpolar molecule due to the presence of two identical bromine atoms. The only intermolecular force present in Br2 is London dispersion forces.
He, also known as helium, is a nonpolar molecule due to its symmetrical electron distribution. The only intermolecular force present in He is also London dispersion forces.
In summary, CH3COOH exhibits both hydrogen bonding and dipole-dipole interactions, Br2 exhibits London dispersion forces, and He exhibits only London dispersion forces. It is important to note that the type and strength of intermolecular forces present in a molecule or compound can greatly affect its physical properties such as melting and boiling points, solubility, and viscosity.

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Assume that every gas in the list will act perfectly. Using the mole fraction of O2 and the specified pressure, the partial pressure of O2 may be computed (P).

What is specified?

The following diagram illustrates the mathematical link between partial pressure of oxygen (P1) and oxygen mole fraction (X1):

P₁=X₁P

By dividing the total number of moles of gases (0.76 + 0.18 + 0.031 + 0.026) by the number of moles of O2 (0.18 mol), it is possible to determine the mole fraction of O2 as follows:

X₁= 0.18 / (0.76+0.18+0.031+0.026)= 0.1805

In this manner, the partial pressure of O2 (P1) is determined:

P1=0.1805x739mmHg, or 133.4mmHg

According to the estimate above, the partial pressure of oxygen is almost equal to 130 mm Hg. As a result, option C is the best one.

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When atoms form chemical bonding then the atoms attain Noble gas configuration.

Noble gas configuration of an atom includes the fundamental image of the ultimate noble fueloline previous to that atom, observed via way of means of the configuration of the ultimate electrons.so for sodium, we make the substitution of [Ne] for the 1s22s22p6 a part of the configuration. Sodium's noble fueloline configuration becomes [Ne]3s1.

Covalent bonds, atoms percentage pairs of electrons, at the same time as in ionic bonds, electrons are absolutely transferred among atoms in order that ions are formed.During the formation of a chemical bond, the predicted end result is that the electrons will whole a noble fueloline configuration in each atoms. Typically, while atoms shape a chemical bond, the predicted end result is that the electrons.

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Answer:

Explanation:

Single replacement

Double replacement

Combustion (and synthesis)

synthesis

Decomposition

The number of moles of HCl produced along with the 2.9 moles of H₃PO₄ is 14.5 moles

From the question, we are to determine the number of moles of HCl that are produced along with 2.9 moles of H₃PO₄

The given balanced chemical equation of the reaction is

PCI₅ + 4H₂O ---> H₃PO₄ + 5HCI

From the balanced chemical equation,

1 mole of PCI₅ reacts with 4 moles of H₂O to produce 1 mole of H₃PO₄ and 5 moles of HCI

Now,

If 2.9 moles of H₃PO₄ are produced from the reaction,

Then,

5 × 2.9 moles of HCl will be produced along with the H₃PO₄

5 × 2.9 =  14.5 moles

Hence, the number of moles of HCl produced is 14.5 moles

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Answer:

815mL am 10000000% sure

The energy gained by water is 1254 J.

Given,

Mass, m = 10.0g

Initial Temperature = 20°C

Final Temperature = 50°C

Specific heat capacity, c = 4.18 J/g·°C

H = mcΔT

where,

ΔT = Final Temperature - Initial Temperature

ΔT = 50 - 20  

ΔT = 30 °C

Substituting the given values,

H = 10 * 4.18 * 30

H = 1254 J

Therefore, the energy gained by water is 1254 J.

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Answer:

It’s just North Atlantic Ocean, Atlantic Ocean, Pacific Ocean and the North Pacific Ocean. NOT THE PACIFIC OCEAN ON THE RIGHT SIDE NOR THE INDIAN OCEAN.

Answer:

14.9 g Sb

Explanation:

The mass of Sb produced can be calculated using the conversion:

Molar Mass (g/mol) = mass (g) / moles

Antimony (Sb) has the molar mass 121.76 g/mol. This value is found on the periodic table. You have been given the moles produced. Therefore, you can find the mass of Sb by plugging these values into the formula and simplifying.

Molar Mass = mass / moles

121.76 g/mol = mass / 0.122 moles

14.9 = mass

Answer:

(ethanol) into acetic acid or vinegar. When wine is exposed to the air, Oxygen in the air interacts with the wine. The wine changes colour and turns both white and red wines brown.

Explanation:

The given unbalanced reaction, Fe + HCl → FeCl\(_{3}\) + H\(^{2}\), can be classified as a single replacement reaction. Option A.

This is because the iron (Fe) is replacing the hydrogen (H) in hydrochloric acid (HCl) to form iron (III) chloride (FeCl\(_{3}\)) and hydrogen gas (H\(^{2}\)). In a single replacement reaction, one element replaces another in a compound. In this case, Fe replaces H in HCl to form FeCl\(_{3}\) and H\(^{2}\). The other reaction types are not applicable to this reaction.

A combination reaction involves two or more reactants combining to form a single product. A double replacement reaction involves two compounds exchanging ions to form two new compounds. A combustion reaction involves the reaction of a fuel with oxygen to produce carbon dioxide and water. A decomposition reaction involves a single reactant breaking down into two or more simpler products. Therefore, the classification for this unbalanced reaction is single replacement. Option A.

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W = -P_ext ΔV

545 J = -P_ext × (-2.50 L)

545 J = 2.50 P_ext L

P_ext = -218 Pa

IG: whis.sama_ent

Option A is correct way of representation of electronic configuration.

The research titled "Stratospheric Ozone in the 21st Century: The Chlorofluorocarbon Problem" by F.S. Rowland was published in the journal Science in 1991. The study's significance is evident in the way it paved the way for global action on the depletion of the ozone layer.

The study outlined the link between chlorofluorocarbons (CFCs) and the depletion of the ozone layer in the stratosphere. These chemicals have long been utilized in refrigerants, air conditioning systems, foam insulation, and various industrial applications. They have been shown to destroy ozone molecules when they rise to the stratosphere, allowing ultraviolet radiation to penetrate the Earth's atmosphere. Rowland's research proved beyond a doubt that human activity is significantly affecting the ozone layer, resulting in an increased risk of skin cancer, blindness, and other problems associated with exposure to UV radiation.

The research is vital in the sense that it helped to initiate international agreements, such as the Montreal Protocol, aimed at phasing out the use of CFCs. These agreements have been instrumental in lowering the production and use of CFCs, resulting in a reduction in the depletion of the ozone layer. As a result, the world has benefited from a decrease in the risks associated with exposure to UV radiation. In conclusion, Rowland's research was groundbreaking in the sense that it confirmed the link between CFCs and ozone depletion, providing a basis for a global reaction to this critical problem.

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Answer:

becoz vvv is always with you

Answer:

Alkali metals have one valence electron on their outer shell. They are more stable when they have eight valence electrons so they tend to loose that one electron and obtain a full octet, therefore become stable

Answer:

the sour food changed

Explanation:

because the molecules were able to move fast enough to overcome the attraction between them, it's molecules now move in place

The given problem involves calculating the pH of a 0.580 M KCH3CO2 solution at 25°C using the given Ka value of CH3CO2H.

The chemical equation for the dissociation of CH3CO2H in water is as follows:
CH3CO2H + H2O ⇌ CH3CO2- + H3O+

The expression for the equilibrium constant (Ka) is given as:
Ka = [CH3CO2-][H3O+] / [CH3CO2H]

Since the acid is weak, we can assume that [H3O+] is approximately equal to [CH3CO2-]. Therefore, the above equation can be simplified as:
Ka = [CH3CO2-]^2 / [CH3CO2H]

We can now use the given Ka value to calculate the concentration of [H3O+] using the ICE table.

Initial: CH3CO2H + H2O ⇌ CH3CO2- + H3O+
0.580 M + 0 M ⇌ 0 M + 0 M

Change: -x + x + x + x

Equilibrium: 0.580 - x + x ⇌ x + x

Using the Ka expression and the equilibrium concentrations, we get:
1.80 x 10^-5 = x^2 / (0.580 - x)

Assuming x is negligible compared to 0.580, we can simplify the equation as:
1.80 x 10^-5 = x^2 / 0.580

Solving for x, we get:
x = 0.0021 M

The pH of the solution can now be calculated using the formula:
pH = -log[H3O+]

pH = -log(0.0021)
pH = 2.68

Therefore, the pH of the 0.580 M KCH3CO2 solution at 25°C is 2.68.

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The substances that open the lungs' airways are called bronchodilators.

Bronchodilators are a class of medication used to treat respiratory diseases such as asthma, chronic obstructive pulmonary disease (COPD), and bronchitis.

They function by relaxing and widening the air passages of the lungs, making it easier to breathe.

A variety of bronchodilators are available. Inhalers, nebulizers, tablets, and syrups are examples of them.

Bronchodilators come in a variety of forms, and their effects vary depending on the form.

For example, nebulized bronchodilators, which are inhaled in the form of a mist, work quickly and are used to treat severe respiratory distress.

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An adjustable-volume micropipette with a range of 0.5-10 μL would be the most accurate for dispensing 125 μL of solution.

What is the micropipette ?

A micropipette is a precision instrument used to accurately measure and transfer very small volumes of liquid, typically between 0.5 µL and 10 mL. It is commonly used in laboratories to prepare samples for chemical analysis and in medical applications to dispense precise amounts of medication. The micropipette is composed of a plunger, a tip, and a cylinder. The plunger is used to draw liquid into the tip, and the cylinder is used to release the liquid. The micropipette is usually operated using a thumbwheel or a push button that controls the plunger. The tip of the micropipette is designed to fit a range of different sized microtubes, allowing for accurate and repeatable transfer of liquids. The micropipette can be calibrated for accuracy, making it an invaluable tool for laboratories that need precise measurements of liquids.

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Answer:

Carbon material refers to any material that's composed primarily of carbon atoms. Carbon could be a flexible component that can exist in numerous diverse shapes, each with one of a kind physical and chemical properties.

Explanation:

Carbon materials have a wide extend of uses in our environment. Here are ten illustrations:

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Answer: B. The actual mechanical advantage of the ramp.

Explanation:

The professor saying that the ramp SHOULD have a mechanical advantage of 3 indicates that that would be the ideal mechanical advantage. Since Rubia calculated it to be 2.8, that means that it is the acutal mechanical advantage. The actual advantage will be reduced from the ieal due to things like friction.

The molality of the original saltwater solution is approximately 5.34 mol/kg.

To determine the molality of the original saltwater solution, we need to calculate the amount of salt (solute) in moles and the mass of water (solvent) in kilograms.

Given:

Mass of salt = 23.8 g

Mass of saltwater solution = 100.0 g

First, we convert the mass of salt to moles using the molar mass of salt (NaCl). The molar mass of NaCl is approximately 58.44 g/mol.

Number of moles of salt = Mass of salt / Molar mass of salt

= 23.8 g / 58.44 g/mol

≈ 0.407 mol

Next, we need to calculate the mass of water in kilograms. Since we have 100.0 g of saltwater solution, and the mass of the salt is 23.8 g, the mass of water can be calculated as:

Mass of water = Mass of saltwater solution - Mass of salt

= 100.0 g - 23.8 g

= 76.2 g

To convert this mass to kilograms:

Mass of water = 76.2 g * (1 kg / 1000 g)

= 0.0762 kg

Now we can calculate the molality (m) using the formula:

Molality (m) = Moles of solute / Mass of solvent (in kg)

= 0.407 mol / 0.0762 kg

≈ 5.34 mol/kg

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The correct answer is a) Henry's Law. This law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in the overlying space.

This means that as the partial pressure of the gas increases, more gas molecules will dissolve in the liquid. Henry's Law is important in many areas of science, including chemistry, environmental science, and biology.

For example, it is used to understand the behavior of gases in the atmosphere and their impact on climate change, as well as the ability of aquatic organisms to obtain oxygen from water.

Henry's Law can also be applied to industrial processes such as gas purification and carbonation of beverages.

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