HELP! 10 pts!! || Which does NOT describe a water molecule?

Group of answer choices


The molecule has a bent shape.


The molecule is an ionic compound.


The molecule dissolves most polar solutes.


The oxygen end of the molecule has a slightly negative charge

Answer:

[H]

Explanation:

This is nascent hydrogen it's a reactive form of hydrogen...

It reduces elements and compounds.

Answer:

The correct option is;

4 percent ionic, 96 percent covalent, 222 pm

Explanation:

The parameters given are;

Phosphorus:

Atomic radius = 109 pm

Covalent radius = 106 pm

Ionic radius = 212 pm

Electronegativity of phosphorus = 2.19  

Selenium:

Atomic radius = 122 pm

Covalent radius = 116 pm

Ionic radius = 198 pm

Electronegativity of selenium= 2.55  

The percentage ionic character of the chemical bond between phosphorus and selenium is given by the relation;

Using Pauling's alternative electronegativity difference method, we have;

\(\% \, Ionic \ Character = \left [18\times (\bigtriangleup E.N.)^{1.4} \right ] \%\)

Where:

Δ E.N. = Change in electronegativity = 2.55 - 2.19 = 0.36

Therefore;

\(\% \, Ionic \ Character = \left [18\times (0.36)^{1.4} \right ] \% = 4.3 \%\)

Hence the percentage ionic character = 4.3% ≈ 4%

the percentage covalent character = (100 - 4.3)% = 95.7% ≈ 96%

The bond length for the covalent bond is found adding the covalent radii of both atoms as follows;

The bond length for the covalent bond = 106 pm + 116 pm = 222 pm.

The correct option is therefore, 4 percent ionic, 96 percent covalent, 222 pm.

Phenolphtalein is chosen because it changes color in a pH range between 8.3 - 10. It will appear pink in basic solutions and clear in acidic solutions.

A titration is a method where the concentration of an unknown solution is ascertained by comparing it to a solution of known concentration. The analyte (the unknown solution) is typically added in a known amount to the titrant (the known solution) from a buret until the reaction is finished.

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Answer:

A theory doesn’t change into a scientific law because of new or better evidence.

Explanation:

A theory will always remain a theory, and i law will remain a law. The reason being that theories and laws may differ on account of newfound countervailing evidence. Remember, theories and laws are very different from hypotheses.

The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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1. Soil serves as a:

medium for plant growth,

regulator of water supplies,

recycler of raw materials,

habitat for soil organisms, and.

landscaping and engineering medium.

2. Soil organisms, which range in size from microscopic cells that digest decaying organic material to small mammals that live primarily on other soil organisms, play an important role in maintaining fertility, structure, drainage, and aeration of soil.

3. Advances in watershed, natural resource, and environmental sciences have shown that soil is the foundation of basic ecosystem function. Soil filters our water, provides essential nutrients to our forests and crops, and helps regulate the Earth's temperature as well as many of the important greenhouse gases.

The river receives a wastewater discharge of 12.5 m³/s containing villiamite (NaF) from the toothpaste factory.

The toothpaste factory disposes of wastewater containing villiamite (NaF) into a large river. The discharge rate from the treatment plant is 12.5 m³/s, which is continuously released into the river. The river itself has a minimum flow of 210 m³/s. The average temperature of the river is 18°C. It is important to consider the potential environmental impact of this wastewater discharge on the river's ecosystem, as well as monitoring and complying with regulatory guidelines for wastewater management and pollutant levels in the river.

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The force of gravity acting on the box is 1,500 N or 152.7 kg.

Force of gravity is the force that attracts two objects towards each other. The force of gravity acting on an object is directly proportional to its mass and inversely proportional to the square of the distance between the object and the center of the Earth.

The force of gravity can be calculated using the formula

Fg = mg,

where Fg is the force of gravity, m is the mass of the object, and g is the acceleration due to gravity,

which is approximately 9.81 m/s2 near the surface of the Earth.

If the box weighs 1,500 N, then the force of gravity acting on the box would be

Fg = mg

    = (1,500 N)/(9.81 m/s2)

    = 152.7 kg.

Therefore, the force of gravity acting on the box is 1,500 N or 152.7 kg.

The force of gravity is an important concept in physics, as it affects everything on Earth. The gravitational force between two objects depends on their masses and the distance between them. The more massive the objects are, the greater the force of gravity between them. Similarly, the closer two objects are, the greater the force of gravity between them.

The force of gravity is also responsible for keeping the planets in orbit around the Sun and the Moon in orbit around the Earth. It is a fundamental force of nature that plays a crucial role in our understanding of the universe.

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Answer: B

Explanation:

Answer:

Fossil energy has been a fundamental driver of the technological, social, economic and development progress which has followed.In 2019, around 84% of global primary energy came from coal, oil and gas. Over the coming decades we need to rapidly reduce this share by displacing them with low-carbon energy sources.Fossil energy has been a fundamental driver of the technological, social, economic and development progress which has followed.In the sections above we looked at the consumption of fossil fuels collectively. But it’s important to look at the role of coal, oil and gas individually – their impacts are not equal. Coal, for example, typically produces more CO2 and local air pollution per unit of energy.There would be more research on the use of alternate fuels.Moreover, fossil fuels are composed primarily of carbon and hydrogen atoms. On combustion they produce carbon dioxide, sulfur dioxide, and carbon monoxide as the main by-products.Solar energy can only be captured during daylight hours.

Explanation:

if you write this then you will get full marks in your assignment it is valied for up to 16 class I don't know about any further it I have mixed many iconic and logic facts that are imp in science!

Answer:

Constant

Explanation:

Trust

Answer:

The 2 beakers of water will have different boiling points because the boiling point of water  is a physical property and the property is independent of the amount of water.

Explanation:

Got 100 on my test

The neutral formula unit for the combination of calcium and NO₃⁻ is Ca(NO₃)₂. Calcium is a metal that belongs to group 2 of the periodic table, and it has a +2 charge. NO₃⁻ is a polyatomic ion that has a -1 charge.

When these two elements combine, they form an ionic compound through electrostatic attraction. The calcium cation and the nitrate anions combine in a 1:2 ratio to form the neutral compound Ca(NO₃)₂. This formula unit represents the simplest ratio of atoms in the compound and indicates that one calcium ion is combined with two nitrate ions.

So, the neutral formula unit for the combination of calcium (Ca) and nitrate (NO₃⁻) is Ca(NO₃)₂. In this compound, calcium has a charge of +2, while each nitrate ion has a charge of -1. To create a neutral formula unit, we need two nitrate ions for each calcium ion to balance the charges.

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At a soil pH of 6.0, calcium (Ca) is the macronutrient that is beginning to become less available.

When a soil's pH decreases to precisely 6.0, it marks the point at which certain macronutrients may start to become less available.

Among the macronutrients mentioned—K (potassium), N (nitrogen), P (phosphorus), Mg (magnesium), and Ca (calcium)—the macronutrient that is beginning to become less available at pH 6.0 is calcium (Ca).

As the soil pH drops below 6.0 and becomes more acidic, it leads to an increased concentration of hydrogen ions (H+). These hydrogen ions can displace and replace calcium ions from the soil particles, resulting in the leaching or removal of calcium from the soil.

This process can lead to a reduction in the availability of calcium for plants, which can negatively impact their growth and development.

Therefore, at a soil pH of 6.0, calcium (Ca) is the macronutrient that is beginning to become less available.

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The molecule that is not an example is O, which is actually an atom of oxygen. Option 2 is correct.

A molecule is a group of two or more atoms held together by chemical bonds. OF and H₂O₂ are molecules because they consist of two different atoms bonded together. O₃ is also a molecule because it consists of three atoms of oxygen bonded together.

NC₁₃ is a molecule because it consists of one nitrogen atom and thirteen carbon atoms bonded together. However, O is simply an atom of oxygen and does not consist of two or more atoms bonded together, so it is not a molecule. Option 2 is correct.

The complete question is

Which choice is not an example of a molecule?

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Answer:

Explanation:

Engineers use their understanding of kinetic energy (KE) and potential energy (PE) to make their designs better and safer in several ways, such as:

   Energy Absorption: Engineers use materials that can absorb and dissipate kinetic energy in order to reduce the impact of collisions or other high-energy events. This can be achieved through the use of materials such as crushable foam or crush zones in cars, or the use of energy-absorbing barriers in buildings and bridges.

   Stored energy: Engineers also use their understanding of potential energy to design systems that can store energy for later use. For example, in the design of hydroelectric dams, engineers use the potential energy stored in water behind the dam to generate electricity. Similarly, engineers use the potential energy stored in compressed gases or springs to power various machines or devices.

   Safety feature: Engineers also use their understanding of Kinetic energy to design safety features such as seat belts and airbags in cars. They use the energy-absorbing materials to decrease the kinetic energy of the passengers during a collision.

   Energy Efficiency: Engineers also use their understanding of energy to design systems that are more energy efficient. For example, they use their knowledge of potential energy to design wind turbines that can generate more electricity from the wind, or use their knowledge of kinetic energy to design more efficient cars that use less fuel.

Answer:

A. gold has the highest monetary value?

Among the given elements, gold has the highest monetary value. So the correct option is A.

Gold (Au) is a chemical element that belongs to Period 6's Group 11 (Ib) and is a thick, glossy golden valuable metal. Gold has historically been extremely valued due to a number of characteristics. It is typically found in nature in a relatively pure form, is appealing in colour and brightness, resilient to the point of virtual indestructibility, and very flexible.

Due to its perceived worth from the beginning, gold has a history that is unmatched by that of any other metal. Gold is one of the densest metals.

It is a good heat and electrical conductor. It is also the softest, most malleable, and ductile of all the elements; a troy ounce (31.1 grammes) of gold may be hammered into gold leaf, which can be crushed into sheets as thin as 187 square feet (approximately 17 square metres).

Therefore the correct option is A.

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Answer:

Hurricanes require some basic components to generate and strengthen: warm ocean water. a lot of moisture in the air. low vertical wind shear

Explanation:

Answer:

A. Kinetic energy

Explanation:

Kinetic energy is stored in the bonds between atoms.

The mass of the ammonia sample is approximately 3.111 grams.

To find the mass of ammonia, we can use the ideal gas law equation, PV = nRT. Given the values P = 1.2 atm, V = 3.7 L, and T = 290 K, along with the ideal gas constant R = 0.0821 L·atm/mol·K, we can rearrange the equation to solve for n, the number of moles.

Convert the pressure to units of atm.

  1.2 atm (already in atm)

Substitute the values into the ideal gas law equation to find the number of moles.

  PV = nRT

  (1.2 atm) (3.7 L) = n (0.0821 L·atm/mol·K) (290 K)

  n = (1.2 atm * 3.7 L) / (0.0821 L·atm/mol·K * 290 K)

Calculate the number of moles of ammonia.

  n = 0.183 mol

Multiply the number of moles by the molar mass of ammonia to find the mass.

  mass = n * molar mass

  mass = 0.183 mol * 17 g/mol

  mass = 3.111 g

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Answer:

The radiation of the Sun's electromagnetic waves

Explanation:

Earth's atmosphere keeps much of the Sun's energy from escaping into space. This process, called the greenhouse effect, keeps the planet warm enough for life to exist.

Answer:

c. -1020.9 kJ

Explanation:

4Fe (s) + 3 O₂ (g) --> 2 Fe₂O₃(s)         ΔH  =  -826.0 kJ/mol.

atomic weight of iron = 56

69.03 g = 69.03 / 56

= 1.23268 moles

Heat released by 1.23268 moles

= 1.23268 x 826.0

= -1020.9 kJ .

\($k=4.5\;[mol\;dm^{-3} min^{-1}],\;\)

\(CA_0=0.5\;[mol/dm^3],\;\)

\(FA_0=4\;[mol/min],\;\)

Volume of the \(CSTR $V=Q.C_{Ai}$\).  We know that both reactors have the same volume.

We can write Volume of each reactor

\($V_1\)

\(=V_2\)

\(=V$\) Concentration of component A at the inlet of the first reactor.

\($C_{A0}\)

=\(C_{Ai}\)

=\(0.5\;\)

\(mol/dm^3$\)Conversion of component A at the outlet of the second reactor

\($X_{out2}\)

Since the reactors are in series and the volumes of the reactors are the same, the space time of each reactor would be equal, therefore .By the design requirements.

\($X_{out2}=0.95$\).

To determine\($X_{out1}$\), we use the design equation for a CSTR.

\($$V=-\frac{FA_0}{(-r_A)}\)

=\(-\frac{FA_0}{k.C_{A0}(1-X)}$$\)

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To figure out where the fallen out boxes go to in the periodic table wall we need to perform a couple of experiments. The kind of experiment would help you categorize some of the elements is:

C) All of the options are correct.

A) Observing the shininess of the elements can help categorize them based on their luster. Some elements, like metals, tend to be shiny, while non-metals may have a dull appearance. This can give clues about the type of element and its position in the periodic table.

B) Testing the ductility of the elements can provide information about their ability to be stretched or deformed without breaking. Metals, for example, are often ductile, while non-metals tend to be brittle. This characteristic can also help in categorizing elements within the periodic table.

D) Measuring the electrical conductivity of the elements can distinguish between metals, which typically conduct electricity well, and non-metals, which are usually poor conductors. This property is closely related to the arrangement of electrons in the atoms and can aid in placing elements in the appropriate regions of the periodic table.

Therefore, all of these experiments can be useful in categorizing elements and determining their placement in the periodic table.

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The complete question is:

To figure out where the fallen out boxes go to in the periodic table wall we need to perform a couple of experiments. What kind of experiment would help you categorize some of the elements?

A) Observe their shininess

B) Test their ductility

C) All of the options are correct

D) Measure their electrical conductivity

The distance between atoms widens as their vibrations get more rapid. The substance's state of matter is determined by the movement and spacing of its particles. The thing grows or  enhanced molecular mobility.

Because kinetic energy of a liquid's molecules rises as the temperature does. As a result, the molecules have more flexibility to travel across larger volumes as the forces that attraction between them are eventually overcome.

According to the gas kinetic theory, as a gas's temperature rises, the typical kinetic energy of its molecules rises, leading to more motion. This real gases equation PV=NkT predicts that the increased velocity will increase the gas's outer pressure.

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Answer:

water,minerals carbon dioxide, and oxygen

Explanation:

We answered it on my little brothers quiz, and we got a 100%!!!

The student can measure 10.5g solid and 25°C using the given equipment (thermometer, stopwatch, and beaker). Option B.

Based on the given equipment (thermometer, stopwatch, and beaker), let's examine the options to determine what the student can measure:

A. 10.5g solid and 24.8 cm³ liquid: The student cannot directly measure the mass of a solid using a thermometer, stopwatch, and beaker. Measuring the volume of a liquid would require a graduated cylinder or a measuring pipette, which is not mentioned in the given equipment. Therefore, this option is not feasible.

B. 10.5g solid and 25°C: The student can measure the temperature of an object using the thermometer, and it is possible to measure the mass of a solid by weighing it. Therefore, this option is valid. The student can weigh the solid using the balance and measure the temperature of an object using the thermometer.

C. 24.8 cm³ liquid and 45 seconds: The student can measure the volume of a liquid using the beaker. However, the stopwatch is not suitable for measuring volume or time intervals in seconds. It is specifically used for measuring time. Therefore, this option is not valid.

D. 25°C and 45 seconds: The student can measure the temperature using the thermometer. Additionally, the stopwatch can accurately measure a time interval of 45 seconds. Therefore, this option is valid. Option B is correct.

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Answer: The molar concentration of the original perchloric acid is 0.1407 M.

The molar concentration of the original perchloric acid can be calculated using the following equation:
Molarity (M) = moles of solute (n) / volume of solution (V).

In this case, the moles of solute can be found by subtracting the volume of the base (0.43 mL) from the volume of the acid (55.00 mL) giving 54.57 mL of perchloric acid. We can then calculate the moles of solute by multiplying the volume of the acid by its molarity, which is 0.2000 M. Therefore, n = 54.57 mL x 0.2000 M = 10.914 mol.

We can now calculate the molarity of the perchloric acid using the equation M = n/V. V is the total volume of the solution, which is the volume of the acid (55.00 mL) plus the volume of the base (22.67 mL) giving 77.67 mL. Therefore, M = 10.914 mol/ 77.67 mL = 0.1407 M.

In conclusion, the molar concentration of the original perchloric acid is 0.1407 M.


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In vivo, most naturally occurring amino acids adopt the L-configuration or the L-stereoisomer. The L-configuration refers to the spatial arrangement of atoms around the central carbon atom (the α-carbon) in the amino acid molecule. In this configuration, the amino group (-NH2) is positioned to the left, and the carboxyl group (-COOH) is positioned to the right when the molecule is drawn in the Fischer projection.

The prevalence of the L-configuration in amino acids can be attributed to the evolutionary history of life on Earth. It is believed that early biochemical processes favored the production of L-amino acids, possibly due to the asymmetry created by certain enzymatic reactions. Over time, this bias toward L-amino acids became dominant in living organisms.

The stereoisomer D-configuration, on the other hand, is less common in naturally occurring amino acids. D-amino acids can be found in certain organisms, such as bacteria, and in special contexts, such as in the cell walls of some bacteria or in peptides produced by non-ribosomal peptide synthesis. However, they are generally rare in proteins found in living systems.

It is important to note that while L-amino acids are predominant in proteins, there are exceptions. For instance, the amino acid glycine lacks a chiral center and is achiral, meaning it does not have a specific L- or D-configuration. Additionally, some non-proteinogenic amino acids, which are not incorporated into proteins, may have different stereochemical configurations.

Overall, the L-configuration is the most commonly observed stereochemical configuration for amino acids in vivo, playing a crucial role in the structure, function, and chemistry of proteins in living organisms.

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