4 points


A solution consists of 2. 50 moles of NaCl dissolved in


100. Grams of H20 at 25°C. Compared to the boiling


point and freezing point of 100. Grams of H20 at


standard pressure, the solution at standard pressure


has


A) a lower boiling point and a higher freezing point


B) a higher boiling point and a lower freezing point


C) a higher boiling point and a higher freezing point


D) a lower boiling point and a lower freezing point

The bond angles in SF₅⁺ are expected to be 90°, 120°, and 180°.

The correct option is E.

Bond angles refer to the angles between the bond linking the atoms of elements in a compound or ion.

The bond angles exist as a result of either electrical repulsion between the electrons in the bonds.

The ion SF₅⁺ contains one atom of sulfur and five atoms of fluorine linked together by covalent bonds. The shape of the ion or the molecular geometry is square pyramidal. Hence, the bond angles are 90°, 120°, and 180°.

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Answer:

The chemical formula for the ionic compound is

Na3N3

Answer: option c) the strongest base in aqueous solution is NaOH

Explanation:

the strongest base in aqueous solution is NaOH because strength of a base is determined by its ability to donate hydroxide ions (OH-) in solution. and NaOH dissociates completely in water to produce Na+ and OH- ions. The presence of a fully dissociated hydroxide ion makes NaOH a strong base.

While, HOC2H4OH and CH3OH are weak acids. HOC2H4OH is ethylene glycol and CH3OH is methanol are weak acid due to the presence of the   (-OH) group.

Also, NH3 (ammonia), is a weak base though it can accept H⁺ to form NH4+

Answer:

omg

Explanation:

omg omg omg omg omg omg omg omg omg omg I can't either ehhhhhh

The moon becomes new when it lies between the earth and the sun. The three objects are roughly aligned (the definition of "approximate" is given below).

Thus, On the back side of the moon, the side we cannot see, is where the full lighted area of the moon is located. Similar to a new moon, a full moon has the earth, moon, and sun in roughly the same configuration.

However, because the moon is on the other side of the earth from us, the entire sunlit portion of the moon is facing us. The shaded area is completely obscured from vision.

When the moon is at a 90-degree angle with the earth and sun, it forms the first quarter moon and third quarter moon, both of which are frequently referred to as "half moons."

Thus, The moon becomes new when it lies between the earth and the sun. The three objects are roughly aligned.

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Answer:

N20

Explanation:

The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

The term balanced chemical equation is defined when the number of the atoms involved in the reactants side is exactly equal to the number of atoms in the products side.

The most important thing about balancing chemical equations is to satisfy the law of conservation of mass, This states that  “the total mass of the products is exactly equal to the total mass of all the reactants”

Thus, The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

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Answer: this looks like your homework

Explanation:if you want help you are going to have to ask a specific question instead of giving people your homework.

Answer:

Honestly I would search this up maybe there might be a pdf with the answers. Sorry chemistry isn't my thing:(

Explanation:

Answer:

A liquid changes to gas

Explanation:

"Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor."

Answer:

B

Explanation:

Giving the answer

Similar ions repel one another and the crystal lattice breaks as a result of the powerful electrostatic interactions.

High melting points are found in ionic substances. Ionic chemicals are brittle and rigid. When an ionic chemical is dissolved in water, it separates into ions. Ionic compound solutions and melting forms of these substances carry electricity, while solid materials do not. The chemical formula of an ionic compound is metal + nonmetal or polyatomic ions.

Ionic networks, also known as lattices, are formed when these oppositely charged ions attract one another. Why this occurs is explained via electrostatics: Like charges repel while opposing charges attract. The result of many ions attracting one another is the formation of massive, organized crystal lattices where each ion is surrounded by ions with the opposing charge.

Hence, ionic bond species repel each other when reach too much closer.

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Answer:

Radiant energy passes across Earth's system boundary, but not mass.

Explanation:

In a closed system, no substance can escape or be added to it. Energy, on the other hand, can still reach the system or leave the system again.

Answer: radiant energy passes across Earth's system boundary, but not mass

Explanation:

100% K12 test

Therefore, 12.8 cm3 of ammonia would be produced by the reaction when 6.4 cm3 of nitrogen is consumed.

To determine the volume of ammonia produced, we need to consider the balanced chemical equation and the stoichiometry of the reaction. Since the chemical equation is not provided, I'll assume a balanced equation for the reaction of nitrogen (N2) with hydrogen (H2) to form ammonia (NH3):

N2(g) + 3H2(g) → 2NH3(g)

According to the balanced equation, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. From the given information, we know that 6.4 cm3 of nitrogen (N2) is consumed.

To calculate the volume of ammonia produced, we need to use the stoichiometric ratio between nitrogen and ammonia. From the balanced equation, we can see that the ratio is 1:2. Therefore, for every 1 cm3 of nitrogen consumed, 2 cm3 of ammonia will be produced.

Using this ratio, we can calculate the volume of ammonia produced as follows:

Volume of ammonia = (Volume of nitrogen consumed) × (2 cm3 of ammonia / 1 cm3 of nitrogen)

Volume of ammonia = 6.4 cm3 × 2 cm3/cm3

Volume of ammonia = 12.8 cm3

Therefore, 12.8 cm3 of ammonia would be produced by the reaction when 6.4 cm3 of nitrogen is consumed.

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The prefixes gluc/o and glyc/o both refer to sugar.

The explanation for this is that both prefixes are derived from the Greek word "glykys," which means sweet. Gluc/o is typically used to refer to glucose, which is a simple sugar that is the primary source of energy for the body.

Glyc/o is a more general term that can refer to any type of sugar, including complex carbohydrates like starches.

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The prefixes gluc/o and glyc/o both refer to glucose or sugar.

Both prefixes are derived from the Greek word "glykys," which means sweet. Gluc/o is commonly used in scientific terminology, while glyc/o is often used in medical terminology.
In medical terminology, the prefixes gluc/o and glyc/o are used interchangeably to denote glucose, which is a simple sugar and an essential source of energy for living organisms. These prefixes are commonly used in words related to glucose metabolism and its related conditions, such as glycemia (blood sugar level) or glucagon (a hormone that raises blood sugar).
In summary, gluc/o and glyc/o are prefixes that represent glucose or sugar in medical terms, and they are used to describe various aspects of glucose metabolism and related conditions.

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To calculate the grams of COCl2 produced, we can use the ideal gas law and the stoichiometry of the reaction.

First, let's calculate the number of moles of CO and Cl2 in the tank using the ideal gas law:

n_CO = (P_CO * V) / (R * T)

n_CO = (0.772 atm * 260 L) / (0.0821 L·atm/(mol·K) * 323 K)

n_CO ≈ 8.08 moles

n_Cl2 = (P_Cl2 * V) / (R * T)

n_Cl2 = (0.753 atm * 260 L) / (0.0821 L·atm/(mol·K) * 323 K)

n_Cl2 ≈ 7.85 moles

Next, let's determine the limiting reactant. From the balanced equation, we can see that the stoichiometric ratio between CO and COCl2 is 1:1, and between Cl2 and COCl2 is 1:1. Therefore, the limiting reactant is CO because it is present in a lower number of moles (8.08 moles).

Since the reaction is assumed to have 100% yield, the moles of COCl2 produced will be equal to the moles of CO used:

n_COCl2 = n_CO

n_COCl2 ≈ 8.08 moles

Finally, let's calculate the mass of COCl2 produced:

mass_COCl2 = n_COCl2 * molar_mass_COCl2

mass_COCl2 = 8.08 moles * 98.92 g/mol

mass_COCl2 ≈ 799.94 grams

Therefore, approximately 799.94 grams of COCl2 can be produced when 0.772 atm of CO and 0.753 atm of Cl2 are mixed in a 260 L tank at 323 K, assuming 100% yield.

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The salt with the lowest molar solubility in water is Fe(OH)2.

compare the given Ksp values of each salt, as Ksp is a measure of solubility. The salt with the smallest Ksp value will have the lowest molar solubility in water.

Here are the Ksp values of each salt:

a. Ni(OH)2 (Ksp = 2.0 × 10^-15)
b. Fe(OH)2 (Ksp = 8 × 10^-16)
c. PbI2 (Ksp = 6.5 × 10^-9)
d. CaCO3 (Ksp = 3.8 × 10^-9)
e. AgBr (Ksp = 5.0 × 10^-13)

Comparing these values, we can see that the salt with the lowest Ksp value is Fe(OH)2 (Ksp = 8 × 10^-16).

Therefore, the salt with the lowest molar solubility in water is Fe(OH)2.

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The salt with the lowest molar solubility in water among the given options is Ni(OH)₂ (Ksp = 2.0 × 10⁻¹⁵).

How does the solubility product constant (Ksp) determine the molar solubility of a salt?

The solubility product constant (Ksp) is an equilibrium constant that represents the degree of solubility of a salt in water. It is determined by the concentrations of the dissociated ions in the equilibrium equation for the salt's dissolution. A lower value of Ksp corresponds to a lower molar solubility of the salt.

To determine the salt with the lowest molar solubility, we compare the given Ksp values. The salt with the lowest Ksp will have the lowest molar solubility, indicating that it is less soluble in water.

In this case, the salt Ni(OH)₂ has the lowest Ksp value of 2.0 × 10⁻¹⁵ among the given options.

Therefore, Ni(OH)₂ has the lowest molar solubility in water.

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Answer:

QCl2

Explanation:

Q should belong to group 2 so valency is 2

R should belong to group 17 so valency is 1

Answer:

Pure

Explanation:

Lotion is pure. Hope this helps!

Answer:

I think pure

hope this helps

have a good day :)

Explanation:

Option (c) 38.9 atm

Given that: Mass of CO2 (m) = 35.0 g

Temperature of the system (T) = 25 o*C or 298 KV = 500 mL or 0.5 L

To find out the pressure (P) exerted by CO2 using the ideal gas equation which is

                                                PV = nRT

                      where,

                                  P = Pressure of the system

                                  n = number of moles of gas

                                  R = Ideal Gas Constant (R = 0.0821 Latm/molK)

                                  T = Temperature of the system

                                  V = Volume of the system

Substitute the given values in the ideal gas equation,

                                  PV= 38.9g

So, the pressure exerted by 35.0 grams of carbon dioxide at a temperature of 25oC and a volume of 500. mL is approximately 38.82 atm.

Hence, option (c) 38.9 atm is the correct answer.

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The gas sample is Cl₂. Answer A.

The ideal gas equation formula PV = nRT

Calculating the number of moles of the gas sample.

PV = nRT

1.04 × 1.365 = n × 0.0821 × 368

1.4196 = n × 30.21

n = 1.4196 ÷ 30.21

n = 0.04699 mol

The formula for mass and number of moles m = n × Mr

Calculating the molar gas from the sample

Mr = m ÷ n
Mr = 3.33 ÷ 0.04699

Mr = 70.9 g/mol

From the info given, gas Cl₂ has the same molar mass as the sample.

So, the gas sample is Cl₂, chlorine gas.

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Answer:

A.The two ends are like poles

Explanation:

Magnets are composed of a north pole and a south pole. If two like poles of a magnetic are placed near each other, the two ends seem to push apart.

The reason for this is that, when like poles of two magnets are made to face each other, the lines of forces are in opposite directions, hence the magnets repel.

If unlike poles of two bar magnets are made to face each other, the magnetic lines of force are now in the same direction therefore the unlike poles attract each other.

As a result, mass is never conserved since every reaction results in a small amount of mass becoming energy or vice versa. However, mass plus energy always conserves. Energy cannot be produced in a vacuum.

The principle of mass conservation states that mass neither creates nor destroys itself during a chemical reaction. For instance, the carbon atom in coal burns and becomes carbon dioxide. Despite changing from a solid to a gas, the carbon atom's mass does not. Mass does not remain constant throughout chemical reactions. It is observed that throughout nuclear and chemical reactions, two physical quantities—the total charge and the number of particles—remain unaltered and preserved. The quantity that is lost in an inelastic collision is called the kinetic energy.

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Answer:

Earth and its atmosphere are continuously altered. Plate tectonics shift the continents, raise mountains and move the ocean floor while processes not fully understood alter the climate

Explanation:

Cyclopropane is highly strained due to its compressed bond angles, resulting in bond angle strain, as well as torsional strain and steric strain caused by the small ring size. The strain in cyclopropane makes it a highly reactive and unstable molecule, requiring energy to break its strained bonds and achieve a more stable configuration.

Cyclopropane is a highly strained molecule due to the following reasons:

Bond Angle Strain: Cyclopropane consists of three carbon atoms arranged in a triangle, resulting in carbon-carbon bond angles of approximately 60 degrees. This is significantly smaller than the ideal bond angle of approximately 109.5 degrees in a tetrahedral geometry. The compressed bond angles create significant strain, known as bond angle strain.

Torsional Strain: The small size of the cyclopropane ring leads to significant torsional strain. In a planar cyclopropane molecule, the carbon-hydrogen (C-H) bonds are forced into unfavorable interactions, causing strain and destabilizing the molecule.

Steric Strain: The three carbon atoms in cyclopropane are forced to be in close proximity to each other due to the small ring size. This results in steric strain, where the bulky groups or atoms present on the carbon atoms experience repulsive interactions, leading to additional strain energy.

These factors collectively contribute to the high strain in cyclopropane, making it a highly reactive and unstable molecule. The strain energy must be overcome to break the strained bonds and convert cyclopropane into a more stable configuration.

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The electron from the peak at a)104 MJ/mol would have the greatest velocity after ejection.

The electron from peak would have greatest electron velocity because the kinetic energy of an electron is directly proportional to its velocity, and the peak with the highest energy corresponds to the highest velocity.

To determine which electron would have the greatest velocity after ejection, we can use the principle of conservation of energy. The electron will gain kinetic energy as it is ejected, and this kinetic energy will depend on the difference between the energy of the incident photon and the ionization energy of the electron.

In this case, we are given the peaks representing different photon energies in units of MJ/mol. The ionization energy required to eject an electron is typically on the order of several electron volts (eV) rather than mega joules (MJ). Therefore, we need to convert the given energy values to electron volts.

1 MJ/mol is approximately equal to 96.49 kJ/mol, and 1 eV is approximately equal to 96.49 kJ/mol. So, we can convert the given values to eV by dividing them by 96.49.

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The p-toluic acid and 4-t-butylphenol can be neutralized or extracted by different chemical reactions using specific elements, thus creating new compounds or acid-base reactions.

The chemical equations for the acid-base reactions that occur during extraction and neutralization of p-toluic acid and 4-t-butylphenol using brine, HCl, sodium bicarbonate, and anhydrous magnesium sulfate are as follows:

1) Extraction of p-toluic acid with brine:
p-toluic acid + NaCl (brine) → Na+ + Cl- + p-toluic acid

2) Neutralization of p-toluic acid with sodium bicarbonate:
p-toluic acid + NaHCO3 (sodium bicarbonate) → Na+ + HCO3- + p-toluic acid

3) Extraction of 4-t-butylphenol with HCl:
4-t-butylphenol + HCl → H+ + Cl- + 4-t-butylphenol

4) Neutralization of 4-t-butylphenol with anhydrous magnesium sulfate:
4-t-butylphenol + MgSO4 (anhydrous magnesium sulfate) → Mg2+ + SO42- + 4-t-butylphenol

These chemical equations show the reactions that occur during the extraction and neutralization processes of p-toluic acid and 4-t-butylphenol using the specified reagents.

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Answer:Robert Hooke, (born July 18 [July 28, New Style], 1635, Freshwater, Isle of Wight, England—died March 3, 1703, London), English physicist who discovered the law of elasticity, known as Hooke’s law, and who did research in a remarkable variety of fields.

Explanation:

In 1655 Hooke was employed by Robert Boyle to construct the Boylean air pump. Five years later, Hooke discovered his law of elasticity, which states that the stretching of a solid body (e.g., metal, wood) is proportional to the force applied to it. The law laid the basis for studies of stress and strain and for understanding of elastic materials. He applied these studies in his designs for the balance springs of watches. In 1662 he was appointed curator of experiments to the Royal Society of London and was elected a fellow the following year.

One of the first men to build a Gregorianreflecting telescope, Hooke discovered the fifth star in the Trapezium, an asterism in the constellation Orion, in 1664 and first suggested that Jupiter rotates on its axis. His detailed sketches of Mars were used in the 19th century to determine that planet’s rate of rotation.