a mass of 48.5 g of a certain substance can be dissolved in 29.1 ml of water at 20 degrees c calculate solubility of this substance per gram of water

Answer:   Elements and compounds are both examples of pure substances.

Explanation:

Answer:

The reaction begins and builds up heat. This heat causes the aluminum to melt and float on top of the liquid bromine (which is producing a cloud of vapor because the heat is also boiling it). Wherever the two elements meet, sparks, heat, and light are given off.

Explanation:

be more specific

Answer:

c. The solubility of lithium chloride will increase

Answer:

Islands are formed by volcanic eruptions and tectonic plates movements.

Explanation:

Islands are land masses that are covered with water on all its sides. Islands are mainly formed by the volcanic eruptions or by the tectonic forces. When volcanoes erupt, they try to build up layers of the lava that eventually emerged through the water surface and forms an island.

Islands can be also formed when tectonic plates forces each other beneath the water body and land masses rise up to form islands.

Yes islands can be formed at any time. But it takes time for the formation of an island.

Islands are more likely to occur on the seas, oceans, lakes or river, etc.

In the given diagram,  the first atom contains one valence electron and the second have 7 valence electrons. The first atom donates the one electron to the second atom and both achieve octet and forms and ionic compound.

Ionic compounds are formed between a metal and non-metal. Metals are rich in electrons and easily loss one or more electrons to other atoms. Non-metals are electron deficient and can gain electron from metals. These electron loss and gain between atoms forms the ionic bond between them.

In the diagram the first atom contains total 11 electron of which one is valence electron. By donating this extra electron the atom can achieve octet. The second one contains total 17 electrons  of which  7 are valence electrons, thus need one more electron to attain octet.

The first atom represents sodium atom and the second one is chlorine atom. Sodium donates its valence electron to Cl and form the ionic compound NaCl.

Na⁺ + Cl⁻ ⇒ NaCl

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Answer:

1 mole is equal to 6.022x10²³

Answer:

2.979 mol

Explanation:

mass of NaF=14+19

                    =33g

33g of NaF is the mass of 1 mol

98.3g of NaF is the mass of (98.3/33)*1=2.979 mol

130 ppm will contain  0.12985167 grams of chlorine present in per liter of pool water.

This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L).

1001.142303 ppm is equal to 1 g/L

So, 130 ppm will contain  \(\frac{130}{1001.142303}\) grams of chlorine present in per liter of pool water which is equal to 0.12985167 gram/L.

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A good description of bacterial reproduction is rapid reproduction through binary fission. That is option A.

Binary fission is defined as the type of asexual reproduction whereby an organism multiplies to form new organisms through the separation of the body into two new bodies.

The process of binary fission include the following:

Under ideal conditions some bacterial species may divide every 10–15 minutes—a doubling of the population at these time intervals.

Therefore, the good description of bacterial reproduction is rapid reproduction through binary fission.

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The term molarity is an important method which is used to calculate the concentration of a solution. By dissolving the same number of moles of each substance in the same volume of water we can make solutions of same molarity. The correct option is B.

Molarity is defined as the number of moles of the solute present per litre of the solution. It is represented as 'M' and its unit is mol / L. The term molarity is also called the molar concentration.

When same number of moles of substances are dissolved in the same volume of water, then the two solutions have same molarity.

Thus the correct option is B.

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Part A:

a. Anode half-reaction: Cd(s) → Cd₂+(aq) + 2e⁻

b. Ionic equation: Cd(s) → Cd₂+(aq) + 2e⁻

c. Phases: solid (s), aqueous (aq)

Part B:

a. Cathode half-reaction: Sn₂⁺(aq) + 2e⁻ → Sn(s)

b. Ionic equation: Sn₂⁺(aq) + 2e⁻ → Sn(s)

c. Phases: aqueous (aq), solid (s)

Part C:

a. Anode half-reaction: Al(s) → Al₃⁺(aq) + 3e⁻

b. Ionic equation: Al(s) → Al₃⁺(aq) + 3e⁻

c. Phases: solid (s), aqueous (aq)

Part D:

a. Cathode half-reaction: 3Cd₂⁺(aq) + 6e⁻ → 3Cd(s)

b. Ionic equation: 3Cd₂⁺(aq) + 6e⁻ → 3Cd(s)

c. Phases: aqueous (aq), solid (s)

Part A: The anode half-reaction for the equation Cd(s) + Sn₂⁺(aq) → Cd₂+(aq) + Sn(s) is the oxidation of cadmium. Part B: The cathode half-reaction for the equation Cd(s) + Sn₂⁺(aq) → Cd₂⁺(aq) + Sn(s) is the reduction of tin. Part C: The anode half-reaction for the equation 2Al(s) + 3Cd₂⁺(aq) → 2Al₃+(aq) + 3Cd(s) is the oxidation of aluminum. Part D: The cathode direction for the equation 2Al(s) + 3Cd₂⁺(aq) → 2Al₃⁺(aq) + 3Cd(s) is the reduction of cadmium.

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The width of the cell, which is 76 micrometers will be have a scientific notation value of 7.6 × 10-⁵metres

CONVERSION FACTOR:

1um = 10-⁶m

Therefore, the width of the cell in metres is 7.6 × 10-⁵m.

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The evidence that refutes the statement is: 4 EVIDENCE: Scientists have observed galaxies are moving away from us.

According to the observations made by astronomers, galaxies in the universe are not only moving away from each other, but they are also moving away from us.

This phenomenon is known as the expansion of the universe, and it contradicts the idea that all matter and energy in the universe was initially concentrated in a tiny corner of space during the time of the big bang and has since filled up the entire universe.

The observation that galaxies are moving away from us suggests that the universe is expanding in all directions. This expansion implies that the universe was not initially confined to a specific location but rather underwent a rapid expansion from a highly dense and hot state.

Therefore, the idea that all matter and energy in the universe was initially concentrated in a small corner of space and then expanded to fill up the whole universe is inaccurate based on the evidence of the observed expansion of galaxies. Evidence 4

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Structural Formula of Ethene: H2C=CH2
Structural Formula of Ethane: CH3-CH3

This reaction is known as hydrogenation.

The question asks for the structural formulas of the products and the name of the reaction mechanism for three given reactions. However, the specific reactions and their corresponding mechanisms are not provided.

To provide a helpful response, I'll give you an example of a reaction, its products, and the name of the mechanism.

Example:

Reaction: The reaction of an alkene with hydrogen gas (H2) in the presence of a catalyst (e.g., platinum) to form an alkane.

Products: In this reaction, the alkene reacts with hydrogen to form an alkane. For example, if the alkene is ethene (C2H4), the product would be ethane (C2H6).

Structural Formula of Ethene: H2C=CH2
Structural Formula of Ethane: CH3-CH3

Reaction Mechanism: This reaction is known as hydrogenation. Hydrogenation is a type of addition reaction, where hydrogen atoms are added across the carbon-carbon double bond of the alkene to form a single bond and convert it into an alkane.

Please note that without specific reactions provided, I can only give you an example to illustrate the process of determining the products and reaction mechanism. If you have specific reactions in mind, please provide them, and I will be glad to assist you further.

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The size of volumetric flask that would be useful in diluting 100 ml of a 3.0 M solution of sucrose to make a 0.60M solution is 500mL.

The volume of a solution can be calculated by using the following expression;

C1V1 = C2V2

Where;

3 × 100 = V2 × 0.60

300 = 0.6V2

V2 = 300 ÷ 0.6

V2 = 500mL

Therefore, the size of volumetric flask that would be useful in diluting 100 ml of a 3.0 M solution of sucrose to make a 0.60M solution is 500mL.

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The drink that would typically have the highest concentration of alcohol is hard liquor. Hard liquors are made through the process of distillation, which increases the alcohol content to a higher level.

Hard liquor is defined as liquor with an alcohol content of 30% or more, or 60 proof or higher. This means that they have a higher concentration of alcohol than beer, wine, or other drinks.Liquors are classified into different categories based on their alcohol content, which determines the intensity of their flavors and aromas. Some of the most popular types of hard liquor include whiskey, vodka, rum, gin, tequila, brandy, and cognac.

These liquors are usually consumed in small quantities, and they are often mixed with other ingredients to create cocktails. Their high alcohol content makes them perfect for people who want to drink alcohol without consuming large amounts of liquid.The alcohol content of hard liquor varies depending on the type of liquor and the brand. However, the average alcohol content for most hard liquors is between 35% and 45%. Some of the strongest hard liquors can have an alcohol content of up to 90%. Therefore, it is important to consume hard liquor in moderation to avoid harmful effects on the body.

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Answer:Yes. Adding or losing neutrons will change the atomic mass without forming a different element.

Explanation: Brainly

Answer:

homogeneous mixture

Explanation:

two or more substances

a component that dissolves and a solvent

The atomic number of an element represents the number of protons in an atom of that element. Since the isotope given is Mn-59, the atomic number of manganese (Mn) remains the same, which is 25.

If an atom of Mn-59 has a charge of +5, it means that it has lost 5 electrons. The number of protons in an atom is equal to its atomic number, and the number of electrons is equal to the number of protons in a neutral atom. Therefore, if the atom has lost 5 electrons, the number of protons remains the same, which is 25.

So, an atom of Mn-59 with a charge of +5 has 25 protons.

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Answer:

The addition of ammonia (NH3) and NH4Cl to watwr produces a buffer solution.

Explanation:

Because, to make a buffer solution from a weak base compound, a salt of the conjugate acid can be added.

Because NH3 has a conjugate acid, namely NH4, the suitable salt added for NH3 to become a buffer solution is NH4Cl.

Answer:

convert the 25.13 g of Fe2O3 into moles by dividing by its molar mass (159.69) to get that. When looking at the stoichiometric coefficients, we can see that for every 1 mole of Fe2O3, there needs to be 3 moles of CO.

Explanation:

Answer:

d

Explanation:

Explanation:

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B) False. The average rate of a reaction is the change in the concentration of a reactant or product over a certain time interval, usually calculated by dividing the change in concentration by the time interval.

It is not the rate of reaction at any given time, but rather an average of the rate of reaction over a certain period of time.

The rate of reaction at any given time is called the instantaneous rate of reaction, and it is calculated by finding the slope of the tangent line to the concentration-time curve at a particular point in time. The instantaneous rate of reaction can change over time as the concentration of reactants and products change, whereas the average rate of reaction remains constant over the time interval for which it is calculated.

Suppose a reaction occurs according to the equation A → B. The rate of this reaction can be expressed as:

Rate = - d[A]/dt = d[B]/dt

where d[A]/dt is the rate of disappearance of A and d[B]/dt is the rate of appearance of B. The negative sign in the equation indicates that the rate of disappearance of A is equal in magnitude but opposite in sign to the rate of appearance of B.

The instantaneous rate of the reaction at a particular time t can be calculated by finding the slope of the tangent line to the concentration-time curve of either A or B at that time. This tangent line represents the rate of reaction at that specific moment in time.

On the other hand, the average rate of the reaction over a certain time interval (t1 to t2) can be calculated by taking the difference in the concentration of A or B at time t2 and time t1, and dividing it by the time interval (t2 - t1):

Average rate = (Δ[A]/Δt)avg = - (Δ[B]/Δt)avg

where (Δ[A]/Δt)avg is the average rate of disappearance of A and (Δ[B]/Δt)avg is the average rate of appearance of B over the time interval.

Therefore, the average rate of a reaction is not the rate of reaction at any given time, but rather an average of the rate of reaction over a certain period of time. The instantaneous rate of reaction, on the other hand, is the rate of reaction at a specific moment in time.

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If acetone has a density of 0.7857 \(\frac{g}{cm^{3} }\)  the mass in grams of point A is 22.4 g and the volume at point B is 8.32 mL.

Acetone is known as a chemical substance that is usually found in the environment but can also be produced artificially. Acetone is a polar organic product that interacts very well with water molecules, generating dipole-dipole relationships.It is colorless with a distinctive smell and taste, we find it in products known as cleaning and personal care products, but we can also use it as a solvent for substances.

Also in the environment in plants, trees and in volcano emissions or in forest fires, it does not become toxic in low doses but if it is exposed to an individual in high doses it can become fatal.

In the statement we can find that acetone has a density of 0.7857 \(\frac{g}{cm^{3} }\).

Therefore, we can confirm that if acetone has a density of 0.7857 \(\frac{g}{cm^{3} }\)  the mass in grams of point A is 22.4 g and the volume at point B is 8.32 mL.

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Even though ethanamide and 1-aminobutane have the same molecular mass, they have different intermolecular forces due to their polarity, resulting in different physical states at room temperature.

Ethanamide (\(CH_3CONH_2\)) is a polar solid at room temperature due to its strong intermolecular hydrogen bonds, which create a lattice structure that gives it solid-state rigidity. Ethanamide, also known as acetamide, is a polar molecule with a carbonyl group that can form hydrogen bonds with other molecules like it. The hydrogen bonding interaction between the molecules is what keeps the solid-state of ethanamide intact.

In contrast, 1-aminobutane (\(C_4H_{11}N\)) is a nonpolar liquid at room temperature, despite having the same molecular mass as ethanamide. It has a linear structure and is an amine, which means it contains a nitrogen atom. However, 1-aminobutane is nonpolar, making it less likely to form intermolecular hydrogen bonds like those in ethanamide.

The fact that 1-aminobutane is nonpolar means that it lacks the strong intermolecular forces, so it exists as a liquid at room temperature and pressure. The molecules can pack more closely together due to the strong intermolecular forces, resulting in a more rigid lattice structure in the solid-state.
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If some water splashed out of the coffee cup during the transfer of metal washers, it would lead to a decrease in the mass of water in the coffee cup. This would result in a decrease in the total heat capacity of the system, which would affect the final specific heat capacity of the metal.

Specific heat capacity is defined as the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius. Thus, a decrease in the mass of water in the system would affect the calculation of the heat energy transferred to the metal, which would affect the specific heat capacity calculation of the metal.

Therefore, it is important to ensure that all the water and metal are transferred accurately and completely to obtain precise and accurate results for the specific heat capacity of the metal.

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Answer:

It contains 24 neutrons.

Explanation:

Mass number = Protons + Neutrons

If you were to have 24 neutrons, the mass number would be 36, invalidating the known information. You have 12 protons and 12 neutrons to form a mass number of 24. Remember that your protons are the same thing as the atomic number, so you can make an equation using your known information to derive true statements.

Answer:

b

Explanation:

G is always positive when enthalpy increases and entropy decreases.

The temperature can be the deciding factor in spontaneity when the enthalpy and entropy terms have opposite signs: If ΔH is negative, and –TΔS positive, the reaction will be spontaneous at low temperatures (decreasing the magnitude of the entropy term).

Where ΔH is the enthalpy change (the heat of the reaction) and ΔS is the change in entropy. If the free energy is negative, we are looking at changes in enthalpy and entropy that favor the process and it occurs spontaneously.

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Answer:

A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. Some particles had their paths bent at large angles. A few even bounced backward. The only way this would happen was if the atom had a small, heavy region of positive charge inside it.