What occurs when an insoluble substance is mixed with water?
It will sink to the bottom and then dissolve.
O It will instantly dissolve in the water.
O It will dissolve after a lot of stirring and mixing.
It will remain solid and not

The steps required to determine the empirical formula of a compound from the mass % are:

1. Convert the mass percentages of each element to moles using the molar mass formula.

2. Divide the mass percentages among the smallest number to calculate the ratio of atoms of each element present.

3. Ensure that the ratio of atoms of each element is a ratio of integer numbers.

The empirical formula of a compound is the simplest whole number ratio of the elements present in the compound. It is often represented using the symbols of the elements involved and can be calculated from the relative masses of the elements. It is helpful in identifying the composition of a compound. For example, the empirical formula for glucose is CH2O, indicating that there is one carbon atom, two hydrogen atoms, and one oxygen atom present in the compound.

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Answer: -210.08 J

Explanation:

Use the formula q = (m)(c)(ΔT)

q = (1.25)(2.02)(102.1-185.3)

q = -210.08 J

This is exothermic! Heat is lost.

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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An electrostatic force of attraction between Ba ⁺² and P⁻³. Because barium has positive charge and phosphorus has negative charge. Therefore, option C is correct.

Non-contact forces, such as electrostatic forces, pull or push on objects without actually making contact with them. When certain materials are rubbed together, a phenomenon known as "charge" can be transferred from one surface to another. Uncharged items are pulled by charged objects, which in turn may push or pull against other charged ones.

The complete transfer of one or more electrons results in the formation of an ionic bond between two oppositely charged ions, which is where the electrostatic force of attraction takes place.

Thus, option C is correct.

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The statement which is not true is as follows:

Thus, the correct option is C.

An equilibrium may be defined as the condition in which both the reactants and products are present in concentrations that have no additional propensity to alter with time so that there is no noticeable transformation in the possessions of the system.

The causation of repulsive force was thought to be made by the overlap of atomic orbitals and in between the electrons of diverse atoms, it matters a lot.

The equilibrium distance between nuclei of two covalently bonded atoms is called the bond length of that atom. It is the atomic separation at equilibrium.

Equilibrium occurs when the attractive and repulsive forces neglected the effect of each other in a specific state.

Therefore, it is well described above.

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Answer:

D

Explanation:

These processes pull heat (energy) from their surroundings to change from one state to another

Answer:

d

Explanation:

Answer:

\( \boxed{\sf Density = 3.12 \ kg/L} \)

Given:

Mass = 2.56 kg

Volume = 0.820 L

To Find:

Density

Explanation:

Formula:

\( \boxed{ \bold{Density = \frac{Mass}{Volume}}}\)

Substituting value of mass & volume in the formula:

\( \sf \implies Density = \frac{2.56}{0.820} \\ \\ \sf \implies Density = 3.12 \: kg/L \)

Answer:

b, H2SO4 with HCl, as they are both liquid acids

The percent ionic character of a molecule can be calculated using the following equation:

Percent Ionic Character = 100 × (μ/r)^2

Where μ is the dipole moment in Debye and r is the bond length in picometers.

Plugging in the given values, we get:

Percent Ionic Character = 100 × (1.39/121)^2

Percent Ionic Character = 100 × (0.0115)^2

Percent Ionic Character = 1.32%

What is dipole moment?

The dipole moment is a measure of the separation of positive and negative charges in a molecule. It is represented by the vector sum of the individual bond dipole moments and is measured in debyes (D).

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The given statement that "When smelling too many intense smells, it can become difficult to tell the difference between odors." is TRUE.

How does this happen?

When you are exposed to strong or intense odors for a prolonged period, it can overstimulate your sense of smell and make it difficult to distinguish between different scents.

This phenomenon is called olfactory fatigue or adaptation. It occurs because the nerve receptors in your nose become less sensitive to the odor after continuous exposure, making it harder to detect subtle differences in smell.

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0.02314 moles of  NO₂ can be formed from the decomposition of 1.25 g of dinitrogen pentoxide.

The balanced equation for the decomposition of dinitrogen pentoxide is:

2 N₂O₅ → 4 NO₂ + O₂

The molar mass of N₂O₅  is 108.01 g/mol.

To determine the number of moles of N₂O₅  present in 1.25 g, we use the following calculation:

moles N₂O₅  = mass / molar mass

moles N₂O₅ = 1.25 g / 108.01 g/mol

moles N₂O₅ = 0.01157 mol

From the balanced equation, we can see that 2 moles of N₂O₅  decompose to form 4 moles of NO2. Therefore, the number of moles of NO2 produced can be calculated as:

moles  NO₂ = (0.01157 mol N2O5) × (4 mol NO2 / 2 mol N2O5)

moles  NO₂ = 0.02314 mol

Therefore, 0.02314 moles of  NO₂ can be formed from the decomposition of 1.25 g of dinitrogen pentoxide.

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The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Answer:

it was pillars

Explanation:

i guessed and it was right LOL

Answer:

O pillars

Explanation:

Right on EDGE 2021

Answer:

The sun will appear to rise and set more slowly

have a nice day! (^o^)

Caustic soda or lye are two other names for sodium hydroxide. It is a typical ingredient in detergents and cleansers. Sodium hydroxide is a colorless, odorless solid at ambient temperature.

Lye and caustic soda are other names for sodium hydroxide, a chemical substance with the formula NaOH. It is a whitish, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).

At normal atmospheric temps, sodium hydroxide, an extremely corrosive base and alkali, breaks down proteins and can result in serious chemical burns. It easily draws moisture and carbon dioxide from the air due to its high water solubility. It produces a string of NaOH-nH2O hydrates. From water solutions, the monohydrate NaOHH2O crystallizes between 12.3 and 61.8 °C. This monohydrate is frequently the "sodium hydroxide" sold professionally, and it may be used in published statistics instead of the anhydrous substance.

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 The best experimental  results in  c. When pH > pKa,\(HC_{7} H_{5} O_{2}\)  > \([NaC_{7} H_{3} O_{2}\)] and \(HC_{7} H_{5} O_{2}\)(s) precipitates from the solution.

When pH > pKa, [\(HC_{7} H_{5} O_{2}\)] > \(NaC_{7} H_{3} O_{2}\) and \(HC_{7} H_{5} O_{2}\), (s) precipitates from the solution is the explanation of the experimental results given  above. Benzoic acid, HC-H502, has a pK, of 4.20 and a molar solubility of 0.0278 M.

Sodium benzoate, \(NaC_{7} H_{5} O_{2}\)s, has a molar solubility of 4.16 M.The given experimental data is shown in the following table:When a sample of 50.0 mL of 2.00 M \(NaC_{7} H_{5} O_{2}\) (aq) was treated with 3.00 M HCl, the pH was noted

The solid crystals were filtered, dried, and weighed. When the pH is greater than pKa, the concentration of benzoic acid (\(HC_{7} H_{5} O_{2}\)) in the solution is greater than the concentration of benzoate (\(NaC_{7} H_{5} O_{2}\)), and benzoic acid (s) precipitates out from the solution .The correct answer is C).

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Answer

False

Explanation:

Answer

pOH=8.036

pH=5.964

The solution is acid

Procedure

We need to consider the following when we speak about pH and pOH

As we have a concentration of [OH-] ions, we will first calculate the pOH

Then we calculate the pH assuming the solution is at 25 C.

We can see that as the pH of this solution is lower than 7, the solution will be acid.

Answer:

This question lacks some parts, it should read "Two or more different elements chemically combined make up a"

The answer is a COMPOUND

Explanation:

A compound is a type of pure substance that is formed as a result of the chemical combination of two or more different elements. During this combination, the atoms of the constituent elements are chemically joined together by CHEMICAL BONDS.

An example of a compound is CaCO3, which contains the following elements: Calcium, Carbon and Oxygen. In this compound, the atoms of the above listed elements are joined together by chemical bonds to form a COMPOUND.

Answer:

After 15 minutes,the volume of the balloon stops expanding

Answer:

A

Explanation:

Two specialized cells called 'guard cells' make up each stoma (stoma is singular for stomata). Plants have many stomata up to 400 per mm2 on their leaf surfaces and they are usually on the lower surface to minimize water loss.

Answer:

Polar molecule. A neutral, or uncharged molecule that has an asymmetric internal distribution of charge, leading to partially positive and partially negative regions

Cohesion The attraction of molecules for other molecules of the same kind

Adhesion The attraction of molecules for other molecules of a different kind

Density The mass per unit volume of a substance

Specific heat capacity The amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius

Heat of vaporization The amount of energy needed to change one gram of a liquid substance to a gas at constant temperature

Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.

Cohesion molecules' attraction to other molecules of the same sort. Adhesion the pull of certain molecules toward others of a different type

Density a substance's mass per unit volume particular heat capacity The amount of heat required to increase a substance's temperature by one degree Celsius in one gram

Vaporization-related heat energy required to convert one gram of a liquid material into a gas at a fixed temperature.

Therefore, Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.

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Photochemical smog forms when (B) volatile organic compounds and oxides of nitrogen are trapped by a thermal inversion and ozone, nitrogen dioxide, and PAN.

When sunlight interacts with nitrogen oxides and volatile organic compounds (VOCs), a mixture of pollutants known as photochemical smog is produced. This results in the formation of a brown haze that hangs over urban areas. Since there is more sunshine in the summer, this phenomenon tends to happen more frequently during that time of year. Primary sources of pollution.

When sunlight interacts with nitrogen oxides and volatile organic compounds (VOCs), a mixture of pollutants known as photochemical smog is produced. This results in the formation of a brown haze that hangs over urban areas.

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Answer:

0.12 M

Explanation:

Step 1: Write the balanced equation

NaOH + HCl ⇒ NaCl + H₂O

Step 2: Calculate the reacting moles of NaOH

10 mL of a 0.30 M NaOH solution react.

\(0.010L \times \frac{0.30mol}{L} = 3.0 \times 10^{-3} mol\)

Step 3: Calculate the reacting moles of HCl

The molar ratio of NaOH to HCl is 1:1. The reacting moles of HCl are 1/1 × 3.0 × 10⁻³ mol = 3.0 × 10⁻³ mol.

Step 4: Calculate the concentration of HCl

3.0 × 10⁻³ mol of HCl are in 25 mL of solution.

\(M = \frac{3.0 \times 10^{-3} mol}{0.025L} = 0.12 M\)

Answer:

Explanation:

making sure the liquid inside the thermometer is at eye level when taking the temperature

making sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature