the _____ point of a titration is the point at which the indicator changes color. the indicator is chosen so that the color change occurs at a ph as close as possible to the ph of the _____ point.

Answer:

C. They change the substance into another substance.

Explanation:

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Gallon of gasoline are needed for dr meyer to drive the 48km distance between salem and portland is 1.151 gallon.

Now,

According to the given question,

Fuel efficiency of dr. meyer's old car is 11km per liter.

According to dimensional analysis,

 11 km = 1 liter

  1 km = 1/11 liter

  48km = 48/11 liter

            =  4.36 liter

Now,

  We know that,

1 liter = 0.264 gallon

Hence,

 4.36 liter = 1.151 gallon

Thus, from the above conclusion we can say that,  Gallon of gasoline are needed for dr meyer to drive the 48km distance between salem and portland is 1.151 gallon.

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Answer:

- 83.33 m per second square

Explanation:

Initial velocity u = 10,000 m/s

Final Velocity v = 5,000 m/s

Time t = 1 minutes = 60 seconds

Acceleration a =?

\( \because \: a = \frac{v - u}{t} \\ \\ = \frac{5000 - 10000}{60} \\ \\ = \frac{ - 5000}{60} \\ \\ a = - 83.33 \: m {s}^{ - 2} \)

There are 0.25 moles of CO₂ (g) in 11.0 grams of CO2 at STP.

Assuming the CO₂ gas in the cylinder is at STP, the total number of moles of gas is calculated as follows:

STP (standard temperature and pressure) is defined as 0°C (273.15 K) and 1 atmosphere (1 atm) of pressure. At STP, 1 mole of any ideal gas occupies a volume of 22.4 liters.

The molar mass of CO₂ is approximately 44.01 g/mol.

To determine the number of moles of CO2 in 11.0 grams at STP, we can use the following formula:

moles = mass / molar mass

Substituting the values we have:

moles = 11.0 g / 44.01 g/mol = 0.25 mol

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Answer:

ternary

Explanation:

A ternary ionic compound is a polyatomic ionic compound composed of three or more different elements.

An ionic compound is a chemical complex made up of ions that are held together through electrostatic forces. The molecule is essentially neutral, however, it contains positively charged cations as well as negatively charged anions.

An ionic compound with three components is known as a ternary ionic compound. One type of cation including one type of anion are still present in a typical ternary ionic combination. Polyatomic ions are cations, anion, or both.

Therefore, a ternary ionic compound is a polyatomic ionic compound composed of three or more different elements.

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Answer:

the difference is  the presence of a carbon atom

Explanation:

Answer: 0.252K

Explanation: V1=150ml    V2=100ml

                       P1=750atm  P2=1atm

                        T1=292K       T2=?

                       (P1V1)/T1 = (P2V2)/T2

                    T2=0.252K

When 1-bromopropane is subjected to magnesium, 1-pentanol results, which is then followed by ethylene oxide and aqueous acid.

A Grignard reagent is created when 1-bromopropane reacts with magnesium to begin the process. Then, the ethylene oxide and the Grignard reagent combine to create an intermediary molecule. Aqueous acid is then used to transform this intermediate chemical into 1-pentanol.

To turn alkenes into alcohols, a technique known as the "Wacker oxidation" or "Wacker process" is utilized. It is significant to remember that Wacker oxidation is a multi-step procedure that calls for particular reagents and circumstances in order to be properly carried out. To produce the desired product, the reaction must be carried out in an inert environment at high temperatures.

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compete question: when 1-bromopropane is exposed to magnesium, followed by ethylene oxide, and then aqueous acid, what is the resulting product? a.) 2-pentanol b.) 2-methyl-2-pentanol c.) 2-methyl-2-hexanol d.) 1-pentanol

Answer:

Niels Bohr

Explanation:

Niels Bohr presented an atom model in which the electron could only occupy specific orbits around the nucleus. The electrons were constrained to particular orbits around the nucleus in this atomic model, which was the first to employ quantum theory.

~

Answer:

neils bohr

Explanation:

on in the pic please mark me as brainlist

Answer:through the conduction from magma to water and rocks

Explanation:

Answer:

i guess b maybe the answer

Answer:

Pacific Ocean

Explanation:

The actual yield of the experiment given the data from the question is 92.4 g (Option B)

This is the ratio of the actual yield to the theoretical yield of a given reaction multiplied by 100

Percentage yield = (Actual / Theoretical) × 100

This is the amount obtained from the expriment procedures

This is the amount obtained from simple calculations as regarding the experiment.

Actual yield = percentage yield × theoretical yield

Actual yield = 80.34% × 115

Actual yield = 0.8034 × 115

Actual yield = 92.4 g

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The statement that describes the formation of galaxies is "Gravity causes stars to cluster."

What is galaxies ?

The statement that describes the formation of galaxies is "Gravity causes stars to cluster."

Galaxies form from the accumulation of gas, dust, and dark matter through the force of gravity. As the gas and dust in a galaxy cluster together, they begin to collapse under their own gravity, forming stars. Over time, these stars cluster together and form galaxies. Therefore, the correct statement that describes the formation of galaxies is gravity causes stars to cluster.

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Answer:

it have been already balanced

2H2 + O2 = 2H2O.

Answer:

5, the last would be incomplete

Explanation:

The first, inner cloud has 2 electrons, then 8, then 8, then 8, then 3.

Answer:

B.) +6

Explanation:

To find the oxidation number of sulfur, we can assume the oxidation numbers of the other elements.

What I mean is, oxygen (O) always has an oxidation number of (-2). That being said, if there are 4 oxygen atoms, oxygen is contributing -8 overall. We also know that hydrogen generally has an oxidation number of (+1). Like before, if there are 2 hydrogens, it must be contributing +2.

If the overall molecule is neutral, we have to get these charges to balance out.

In essence, -8 + 2 + ? = 0?

If you combine the charges from oxygen and hydrogen, you are left with -6. Therefore, to make the molecule neutral, sulfur must have an oxidation number of +6.

The frequency of the photon absorbed during the transition from n1 = 2 to n2 = 4 is approximately 6.17 × 10^14 Hz.

The Rydberg equation is given by:

1/λ = R * (1/n1^2 - 1/n2^2)

where λ is the wavelength of the absorbed or emitted photon, R is the Rydberg constant, and n1 and n2 are the principal quantum numbers representing the initial and final energy levels of the hydrogen atom, respectively.

To calculate the frequency (f) of the absorbed photon, we can use the equation:

f = c / λ

where c is the speed of light in a vacuum, approximately 3.00 × 10^8 m/s.

Let's substitute the given values into the equations:

For the Rydberg equation:

1/λ = R * (1/n1^2 - 1/n2^2)

1/λ = (1.096776×10^7 m^−1) * (1/2^2 - 1/4^2)

Simplifying the expression:

1/λ = (1.096776×10^7 m^−1) * (1/4 - 1/16)

1/λ = (1.096776×10^7 m^−1) * (3/16)

1/λ = (3.295328×10^7 m^−1) / 16

1/λ = 2.05958×10^6 m^−1

Now, we can calculate the wavelength (λ) using λ = 1 / (1/λ):

λ = 1 / (2.05958×10^6 m^−1)

λ = 4.85579 × 10^(-7) m

Finally, we can calculate the frequency (f) using f = c / λ:

f = (3.00 × 10^8 m/s) / (4.85579 × 10^(-7) m)

f ≈ 6.17 × 10^14 Hz

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to obtain 500 mg of the drug, we would need to measure 5 ml of the stock solution.

To determine the volume of stock solution needed to provide 500 mg of the drug, we can use the following calculation:

Amount of drug needed = 500 mg
Concentration of stock solution = 100 mg/ml

We can set up a proportion to solve for the volume of stock solution:

(500 mg) / (x ml) = (100 mg) / (1 ml)

Cross-multiplying the proportion, we get:

500 mg * 1 ml = 100 mg * x ml

Simplifying, we find:

x ml = (500 mg * 1 ml) / 100 mg
x ml = 5 ml

Therefore, to obtain 500 mg of the drug, we would need to measure 5 ml of the stock solution.

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Answer:

3500000 try this i think it's right not sure

Explanation:

Calories are used to define the unit of energy given by the consumed food in the body. A dinner containing 3.5x10⁶ joules has calories of 836.52 Cal.

Calories have been defined as the amount of energy given by the food and its various components, including carbohydrates, proteins, fats, fibers, etc. The stored calories more than the use of those calories results in their storage in the adipose tissues which may lead to obesity.

The food energy from joules can be converted into large calories (Cal) as it is the required amount to raise 1°C of the temperature of a 1 kg substance at 1 atm pressure.

The conversion is done as:

1 J = 0.000239 Cal

3500000 joules = 836.520 Cal

Therefore, the energy of dinner in calories is 836.520 Cal.

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Explanation:

ascorbic acid is lemon

lemon contain ascorbic acid....

it is organic acid.....

Between a tight system and its environment, energy can be exchanged. However, a closed system is unable to exchange material with its surroundings. Heat and work can be exchanged in a closed system.

An open network can exchange both material and energy with its surrounds. Since water and heat vapor can really be dissipated to the air, the burner example would be considered an open system. To the contrary hand, a closed system can only interchange energy, not matter, with its surrounds.

A thermos can be thought of as a closed circuit as only energy can enter or exit it, but no matter can because it won't spill.

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Lewis has chosen the path of waste reduction and recycling towards sustainability.

By separating his newspapers and glass from the rest of his trash, Lewis is actively reducing the amount of waste that would end up in landfills. Instead, he takes them to a collection point where they can be reprocessed and reused, thus reducing the need for new resources to be extracted and manufactured.

This approach aligns with the principles of waste reduction and recycling, which aim to minimize the impact of human activities on the environment by reducing waste generation and promoting the reuse of materials. Overall, Lewis's actions demonstrate a commitment to sustainability by actively participating in waste reduction and recycling efforts.
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Lewis has chosen the path of waste reduction and recycling towards sustainability.

Lewis's action of separating his newspapers and glass from the rest of his trash is an example of waste reduction, which is one of the main paths towards sustainability. By reducing waste, we can conserve resources and reduce pollution. Additionally, by taking his recyclable materials to a collection center, Lewis is contributing to the recycling process, which also helps to conserve resources and reduce waste.

Recycling is an important step towards sustainability because it reduces the need for raw materials and energy-intensive manufacturing processes, which can have negative environmental impacts. Overall, Lewis's choice to reduce waste and recycle is a positive step towards sustainability and can inspire others to take similar actions.

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Answer:

2 aluminum reacts with sulfuric acid

1. The gas whose concentration decreases when pCO2 levels increase in order to maintain oxygen levels is nitrogen.

2. Minute ventilation is the total volume of air that is breathed in and out in one minute.

3. CO2 and pH have a direct relationship that affects minute ventilation.

4. Inhaling increased amounts of CO2 can affect pulmonary ventilation in a number of ways. The increased levels of CO2 can cause the respiratory rate to increase, leading to hyperventilation.

1. The gas whose concentration decreases when pCO2 levels increase in order to maintain oxygen levels is nitrogen. As the amount of CO2 in blood increases, the body compensates by decreasing the concentration of nitrogen gas in the inhaled air.

2. Minute ventilation is the total volume of air that is breathed in and out in one minute. When inhaled air contains 5% carbon dioxide, minute ventilation will increase to help remove the excess carbon dioxide from the body.

3. CO2 and pH have a direct relationship that affects minute ventilation. When CO2 levels increase, the pH decreases and causes the respiratory rate to increase. This increased ventilation helps to remove excess CO2 and restore the pH balance.

4. Inhaling increased amounts of CO2 can affect pulmonary ventilation in a number of ways. The increased levels of CO2 can cause the respiratory rate to increase, leading to hyperventilation. This can cause dizziness, shortness of breath, and other symptoms. Additionally, it can lead to respiratory acidosis if the body is unable to compensate for the increased CO2 levels.

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The identification of patterns in nature is an important tool for scientists studying the mechanisms of evolution.

Mechanisms are a type of device or process which performs a specific function or set of functions. Mechanisms are often used to convert energy into motion, or to control the movement of objects.

By recognizing patterns in the data they collect, scientists can better understand how organisms and populations change over time and can make predictions about future evolutionary trajectories. For example, by studying the fossil record and comparing the features of different species, scientists can identify patterns that suggest the emergence of new species and identify shared traits that may point to common ancestors. This knowledge can then be used to make predictions about how a species may evolve in the future, aiding in conservation efforts and providing insight into the development of new species.

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Answer:

Mercury

Explanation:

It is also highly toxic

Hence, in order to create 87.5 g of water, we require 77.5 g of oxygen gas.

Exothermic means that the reaction between hydrogen and oxygen releases energy into the environment. water is produced when hydrogen and oxygen are combined. 2hydrogen + oxygen → water Fuel cells generate electricity through the reaction of a fuel and oxygen.

The equation must be balanced by adding a 2 coefficient to the left-hand side:  2hydrogen + oxygen → water

We can see from the equation that it is balanced that 1 mole of O2 reacts with 2 moles of water. The amount of moles of water created can be determined using the molar mass of water:

87.5 g water / (18.02 g/mol water) = 4.858 mol water

Hence, for the water to react, we just need half as many moles of oxygen:

4.858 mol water x (1 mol oxygen/2 mol water) = 2.429 mol oxygen

Finally, we may get the required mass of oxygen by using its molar mass:

2.429 mol oxygen x (32.00 g/mol oxygen) = 77.5 g O₂

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Exothermic changes give out energy to their surroundings, causing an increase in heat endothermic changes, take in energy, so the opposite takes place.