What is the H-N-H bond angle in a molecule of NH3?
A. 180°
B. < 109.5°
C. >109.5°
D. 120

The boiling point of a substance is also called the saturation temperature. It is the temperature at which a substance shows transition from liquid to gaseous state.

The boiling point of a liquid is defined as the temperature at which its vapour pressure becomes equal to the atmospheric pressure. It is at this temperature a liquid starts to boil.

The boiling point is highly dependent on the intermolecular forces of a compound. The compounds with stronger intermolecular forces, higher masses and less branching have high boiling points.

Thus the boiling point of a compound is affected by many factors.

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If hydrochloric acid is added to a solution of HF, it will react with the HF to form H3O+ and F- ions. This reaction is a type of acid-base reaction, where the hydrochloric acid acts as the stronger acid and donates a proton to the HF, which acts as the weaker base.

The addition of hydrochloric acid will increase the concentration of H3O+ ions in the solution. This increase in the concentration of H3O+ ions will shift the equilibrium of the HF ionization reaction to the left, leading to a decrease in the percent ionization of HF. This is because the increased concentration of H3O+ ions will make it more difficult for the HF molecules to ionize and release H+ ions into the solution.

Therefore, the correct answer is that the percent ionization of HF will decrease. The Ka for HF will not change, as it is a constant value for a given temperature and is independent of the concentration of H3O+ ions in the solution.

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Answer: The value of \(K_{b}\) for chloroform is \(3.62^{o}C/m\) when 0.793 moles of solute in 0.758 kg changes the boiling point by 3.80 °C.

Explanation:

Given: Moles of solute = 0.793 mol

Mass of solvent = 0.758

\(\Delta T_{b} = 3.80^{o}C\)

As molality is the number of moles of solute present in kg of solvent. Hence, molality of given solution is calculated as follows.

\(Molality = \frac{no. of moles}{mass of solvent (in kg)}\\= \frac{0.793 mol}{0.758 kg}\\= 1.05 m\)

Now, the values of \(K_b\) is calculated as follows.

\(\Delta T_{b} = i\times K_{b} \times m\)

where,

i = Van't Hoff factor = 1 (for chloroform)

m = molality

\(K_{b}\) = molal boiling point elevation constant

Substitute the values into above formula as follows.

\(\Delta T_{b} = i\times K_{b} \times m\\3.80^{o}C = 1 \times K_{b} \times 1.05 m\\K_{b} = 3.62^{o}C/m\)

Thus, we can conclude that the value of \(K_{b}\) for chloroform is \(3.62^{o}C/m\) when 0.793 moles of solute in 0.758 kg changes the boiling point by 3.80 °C.

There are so many laws for ideal gas at constant temperature , at constant pressure, the law at constant volume is called Gay-Lussac's law. The pressure calculated is 1.555atm.

According to this law, pressure is directly proportional to temperature. This gas law is valid only to ideal gas not on the vanderwaal gas. Since it is mentioned in the question that volume is constant we can apply Gay-Lussac's law over here.

Mathematically

\(P_{1} T_{2} =P_{2} T_{1}\)

\(P_{1}\)= 1.50 atm

\(T_{1}\)=295 K

\(T_{2}\)= 305 K

Substituting all values given in the question

\(P_{2}\)=  (1.50 atm×305 K)÷295 K

  =1.555atm

Thus the pressure is 1.555atm

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Answer:

When light waves strike a medium and are neither reflected or refracted, nor are they allowed to pass through.

Explanation:

Out of the options listed, washing clothes in cold water instead of warm is an energy conservation practice. Option C is correct.

Energy conservation refers to the practice of reducing the amount of energy used in daily activities while still achieving the desired results. This practice is essential in reducing greenhouse gas emissions, combating climate change, and reducing reliance on non-renewable energy sources.

This practice reduces the amount of energy required to heat water, which saves both energy and money. Heating water accounts for a significant amount of energy use in households, and by reducing the temperature, a significant amount of energy can be saved.

Raising the temperature on a water heater, on the other hand, is not an energy conservation practice. This action leads to increased energy consumption, as the water heater needs to work harder to maintain the desired temperature. It is recommended to keep the temperature of the water heater at 120°F to reduce energy consumption.

Running the washing machine with smaller loads can reduce water usage, but it may not necessarily reduce energy usage. Energy consumption is directly related to the amount of water used, the temperature of the water, and the duration of the washing cycle.

Lowering the thermostat's temperature in the summer can save energy if it leads to a reduction in air conditioning usage. However, if it leads to increased use of fans or other cooling equipment, it may not result in energy conservation.

In conclusion, washing clothes in cold water instead of warm is an energy conservation practice that households can adopt to reduce energy usage, save money, and contribute to environmental sustainability. Option C.

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Answer:

i) Iron metal is obtained

ii) Fe2O3 + 3CO → 2Fe + 3CO2

iii) CO is the reducing agent

Explanation:

i) When carbon monoxide is passed over iron III oxide, iron metal is obtained

ii) The equation of the reaction is;

Fe2O3 + 3CO → 2Fe + 3CO2

iii) The reaction is a redox reaction. CO acts as the reducing agent while Fe2O3 acts as the oxidizing agent. We know that CO is the reducing agent because its oxidation number increased from left to right. Recall that the oxidation number of the reducing agent increases from left to right in a redox reaction

Answer:

facta you from the same thing as you from the samel

Answer:

The first one

The process of dissolving frees the electrons in the solution to move.

Explanation:

Answer: The solution with pH of 14 will be a strong base.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

\(pH=-log[H^+]\)

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7. Thus pH scale range from 1 to 14.

Strong acids have low pH ( around 1 ) values where as strong bases have high pH ( around 14) values.

Answer:

on my test the answer was a strong acid

Explanation:

Redox reaction is a type of chemical reaction in which the electrons are transferred between species. The chloride ion is the reducing agent in the reaction.

A reducing agent in a reduction-oxidation reaction is the chemical species that donates or loses electrons to another species and is present in a lower oxidation state.

The reduction-oxidation reaction is shown as,

\(\rm MnO_{2} + 4H^{+} + 2Cl^{-} \rightarrow Mn^{2+} + 2H_{2}O + Cl_{2}\)

In this reaction chloride ions lost two-electron and their oxidation number changed to zero. Hence, the chloride ion is the reducing agent.

Here, manganese is an oxidizing agent as the oxidation number changes from +4 to +2 and gains electrons.

Therefore, option A. chloride ion is the reducing agent.

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Answer:

Answer is A

Explanation:

CI-

Answer: 500 individual nerds candies for $5 would be better bc u would have more candy and it would last a while

Explanation: would have more candies

To solve this we must be knowing each and every concept related to division. Therefore, 500 individual nerds candy for $5 is preferable since you will have more candy and it will last longer.

Division is one of four fundamental mathematical operations, the others being addition, subtraction, and multiplication. Division is defined as the equal division of larger groups into smaller units.

The division of labor is the sequence of tasks given to and performed by the  group of staff in order to maximize efficiency. The splitting down of a job into multiple separate parts that make up the total is referred to as division of labor. 500 individual nerds candy for $5 is preferable since you will have more candy and it will last longer.

Therefore, 500 individual nerds candy for $5 is preferable since you will have more candy and it will last longer.

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Answer: The equilibrium will shift to the left.

Magnesium hydroxide, with the chemical formula Mg(OH)2, is an inorganic substance. It can be found as the mineral brucite in nature. It is a solid white material that is only weakly soluble in water.

Antacids like milk of magnesia have magnesium hydroxide as one of their ingredients. Constipation and reliance on laxatives develop from prolonged or excessive usage of this drug for constipation. Additionally, excessive use of magnesium hydroxide results in dehydration, persistent diarrhea, and mineral imbalances. When utilizing a large dose of magnesium hydroxide, the symptoms may include severe nausea, vomiting, or diarrhea.

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The combined mass of hydrochloric acid and sodium hydroxide is determined by adding their individual masses.

When calculating the combined mass of hydrochloric acid and sodium hydroxide, we need to consider the individual masses of these two substances. Hydrochloric acid (HCl) has a molecular formula of HCl and consists of one hydrogen atom (H) and one chlorine atom (Cl). Sodium hydroxide (NaOH), on the other hand, is composed of one sodium atom (Na), one oxygen atom (O), and one hydrogen atom (H). To calculate the combined mass, we add the individual masses of these reactants.

The molar mass of hydrogen (H) is approximately 1 gram/mol, while the molar mass of chlorine (Cl) is approximately 35.5 grams/mol. Sodium (Na) has a molar mass of around 23 grams/mol, oxygen (O) has a molar mass of approximately 16 grams/mol, and hydrogen (H) has a molar mass of around 1 gram/mol.

To determine the combined mass of hydrochloric acid and sodium hydroxide, we multiply the number of atoms of each element by their respective molar masses and sum them up. For example, hydrochloric acid has one hydrogen atom and one chlorine atom, so the total mass would be 1 gram/mol (hydrogen) + 35.5 grams/mol (chlorine). Similarly, sodium hydroxide has one sodium atom, one oxygen atom, and one hydrogen atom, resulting in a combined mass of 23 grams/mol (sodium) + 16 grams/mol (oxygen) + 1 gram/mol (hydrogen).

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Conjugated diene is applied to the type of diene represented by 2,4-hexadiene.

what is conjugated diene?

A chain of hydrocarbons known as a diene contains 2 double bonds, which may or may not be close to one another. This section compares two nearby double bonds with an emphasis on the delocalization of π systems. The configurations of these double bonds can influence how reactive and stable a molecule is.

Conjugated dienes are more stable than unconjugated and cumulated dienes because a molecule is more stable when it has a higher electron density delocalized.

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The complete question is :

What descriptive term is applied to the type of diene represented by 2,4-hexadiene?

A. Cumulated diene

B. Conjugated diene

C. Alkynyl diene

D. Isolated diene

E. None of the above

The best electrode for a saltwater battery, which will not corrode, is typically a non-reactive material such as platinum, graphite, or carbon-based substances, chosen for their resistance to corrosion in the presence of a saltwater electrolyte.

It is essential to choose an electrode material for a saltwater battery that can tolerate the corrosive properties of the saltwater electrolyte. The optimal electrode choice would be a non-reactive, corrosion-resistant substance. In this context, materials like platinum, graphite, or anything made of carbon are frequently used.

The benefit of being stable and long-lasting in the presence of saltwater is one of these non-reactive electrode materials. They are less prone to experience chemical processes that could eventually cause corrosion or the electrode's degeneration. The electrode can keep its performance and efficiency for a long time by selecting materials with a high resistance to oxidation and appropriate electrical conductivity.

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Answer:

3.90g/mL

Explanation:

To find the density of a substance, divide the mass by the volume.

So, 37.6 / 9.65 = 3.89637

then round to 3 significant figures

Good luck!

Answer:

The calcium hydroxide solution will likely have the pH of 14 (very basic) while rain water will likely have a pH if 6.5 (slightly acidic).

Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy

Explanation:

Answer:

endothermic; the dough absorbs heat

Explanation:

EDG2020

The % ee (enantiomeric excess) of the mixture can be calculated as 7.8%.

Enantiomeric excess (% ee) is a measure of the purity of a chiral compound or mixture, indicating the percentage of one enantiomer present in excess over the other. To calculate % ee, we need the observed rotation value and the specific rotation of the pure enantiomer. The formula for % ee is:

% ee = (observed rotation / specific rotation) × 100

The observed rotation is 0.78 and the specific rotation is not provided. However, if we assume a specific rotation of 1 (arbitrary units), we can calculate a relative % ee:

% ee = (0.78 / 1) × 100 = 78%

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The following statement concerning energy transformations is true is option (a) that is increases in entropy reduce usable energy because Total energy is equals,

Total energy=  free Energy + entropy x temperature.

Gibbs free energy denoted by G which is the combination of enthalpy and entropy into a single value. The change in free energy that is equal to the sum of the enthalpy plus the product of the temperature and entropy of the system.

Entropy is defined as the measure of the thermal energy of the system per unit temperature that is unavailable for doing useful work. The amount of entropy is also a measure of the molecular disorder or randomness of a system due to the work is obtained from ordered molecular motion.  It is a measure of disorder and affects all aspects of our daily lives.

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Complete question is,

Which of the following statements concerning energy transformations is true?

a. increases in entropy reduce usable energy

b. energy must be created during transformation

c. potential energy increases with each transformation

d. increases in temperature decrease total amount of energy available

e. decreases in entropy reduce usable energy

Answer:

1. Honey → Hybridization

2. Green manure → Ayurvedic medicine

3. Duck → Poultry

4. Cereal → Wheat

5. High-yielding varieties → Nitrogen and phosphorus

Hope this helps :)

Pls brainliest...

The reaction slows down as the reaction proceeds and The half-life of the reaction stays constant as the reaction proceeds. Therefore the correct option is option A and D.

The rate of a first-order reaction is inversely proportional to the reactant concentration. The concentration of the reactant falls over the course of the reaction, which slows down the rate of the reaction.

However, the reaction's half-life is constant, which means that no matter where in the reaction it occurs, the length of time needed for half of the reactant's starting concentration to be consumed is the same.

The units of the rate constant for a first-order reaction are the same as the units for the reaction's rate, such as s-1 or min-1.

Reactant concentration changes linearly rather than nonlinearly. Therefore the correct option is option A and D.

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Based on the diagram provided, the correct order of the sequence of how solar systems form is: Dust and gas cloud, Gravitational collapse, Formation of a protostar, Nuclear fusion ignition, Stellar wind and radiation pressure, Planetary disk formation, and Planet formation.

Dust and gas cloud: The first step in the formation of a solar system is the accumulation of gas and dust in a large cloud, also known as a nebula.

Gravitational collapse: As the dust and gas cloud accumulates, its gravitational force becomes stronger, causing the cloud to collapse inward.

Formation of a protostar: The collapsing cloud forms a hot and dense core called a protostar, which is not yet hot enough for nuclear fusion to occur.

Nuclear fusion ignition: As the protostar continues to contract and heat up, it eventually reaches a temperature and pressure at its core that is high enough for nuclear fusion to begin, producing energy that counteracts the force of gravity and stabilizes the star.

Stellar wind and radiation pressure: During the fusion process, stars emit high-energy particles and radiation that exert pressure on their surroundings, creating a stellar wind that blows away the remaining gas and dust in the surrounding nebula.

Planetary disk formation: As the nebula dissipates, a flattened disk of gas and dust forms around the newly formed star.

Planet formation: Dust particles in the disk begin to clump together and grow through collisions, eventually forming planetesimals and eventually planets.

Thus, this is the correct sequence of solar system.

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