A 10 L mixture is made up of 40% antifreeze. How much of the mixture needs to be removed and filled with pure antifreeze to reach a concentration of 60% antifreeze

Answers

Answer 1

Answer:

Answer:

3.3 liters of the mixture is needed to be removed and filled with 3.33 liters pure antifreeze to reach a concentration of 60% antifreeze.

Explanation:

A 10 L mixture is made up of 40% antifreeze.

Initial Volume of antifreeze in 40% mixture = 40% of 10 L = 4L

Let volume of pure antifreeze added = x

Volume of antifreeze removed = 40% of x= 0.4 x

Volume of antifreeze in 60% mixture = 60% of 10 L = 6 L

Volume of antifreeze left after removal of 0.4 x L of antifreeze and addition of x L of pure antifreeze will be equal to 6 L of antifreeze in the final solution.

4L - (0.4 x ) + x = 6L

x = 3.33 L

3.3 liters of the mixture is needed to be removed and filled with 3.3 liter pure antifreeze to reach a concentration of 60% antifreeze.

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A _________________ is developed through the scientific method, and it can be modified or improved upon. It may be represented by a model. As seen here, three different models were used to represent atomic structure as ideas changed over time.

Answers

I think that the best phrase to fit into the blank is a "scientific theory".

A scientific theory is developed through experiments which use the scientific method, and a theory can be improved if additional data is available or if people provide suggestions which make the theory fit the data better.

A simple answer to this "a theory".

According to the quantum-mechanical model for the hydrogen atom, which electron transitions produces light with the longer wavelength: 2p→1s or 3p→1s?

Answers

Answer:2p→1s

Explanation:

Frequency is inversely proportional to wavelength. The higher the frequency, the shorter that wavelength. The smaller the frequency the longer the wavelength. The frequency of light associated with 2p→1s is less than the frequency of light associated with 3p→1s since the latter represents transition from a much higher energy level. It follows that the wavelength associated with the former will be longer since its frequency is lesser. This deduction follows from our argument about the inverse relationship between frequency and wavelength.

Hard water contains calcium and magnesium, which undergo oxidation andclog water pipes. Which statement best describes this change as a chemical change?

A.Calcium and magnesium dissolve in water.

B.Calcium and magnesium evaporate on contact with the walls of the pipe.

C.Calcium and magnesium form precipitates of their respective oxides.

Answers

It's C, calcium and magnesium form precipitates of their respective oxide

Final answer:

The statement 'Calcium and magnesium form precipitates of their respective oxides' best describes the chemical change as it involves a reaction that transforms the calcium and magnesium into new compounds, their oxides, which can clog pipes.

Explanation:

The statement that best describes this change as a chemical change is C. Calcium and magnesium form precipitates of their respective oxides. This represents a chemical change because it involves a reaction that transforms the calcium and magnesium into new substances - their oxides. Here's how it works: in the presence of oxygen, calcium and magnesium in hard water can undergo an oxidation process. During this oxidation, the calcium becomes calcium oxide and the magnesium becomes magnesium oxide. These oxides are less soluble in water and form precipitates, which can accumulate and clog the pipes.

Learn more about Chemical change here:

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Multiple answers are allowed.

Answers

Answer:

There are two correct choices:

Real gas particles have significant volume
Real gas particles have more complex interactions than ideal gas particles.

Explanation:

Ideal gases are not real; ideal gases are a theoretical model used to confere a better understanding of gas properties. This model permits to predict the behavior of the gases using the ideal gas law, which is valid under certain conditions (mainly low pressure and high temperature).

Kinetic molecular theory states these basic assumptions for gases:

Gas particles are in constant, random motion.

Gas particles move in a straight line until they collide with another particle or the walls of the container.

Gas particles are much smaller than the distance between particles, so most of the volume of a gas is therefore empty space, and the particles are considered to occupy no space.

There is no force of attraction acting on gas particles nor between them

Collisions are perfectly elastic, meaning that no energy is lost durign collisions.

Those conditions are not perfected matched by real gas particles, since real gas particles do occupy a volume and interact with each other, this is real gas particles have significant volume and have more complex interactions than ideal gas particles.

Answer

Option 1 - Real gases are always hotter than the ideal gases.

Explanation

Gases that are different from ideality are called real gases because they are always hotter than the ideal gases as they are flying past each other at an extremely high speed that creates kinetic energy. Whereas idea gases have absolutely elastic collisions, this is as it has a valuable theory because it embraces the perfect concept of original gas law.

Answer

Option 2 - Real gases particles have significant volume.

Explanation

Real gases have significant volume because they have a high temperature and have a higher volume as compared to ideal gases. There is a general gas theory that is composed of several randomly crossing point particles. Several gases, for example, nitrogen, oxygen, and hydrogen can be manipulated like ideal gases within a generous immunity of the idea gas.

Answer

Option 3 - Real gases particles are smaller than an ideal gas.

Explanation

Real gas particles are smaller than ideal gas particles since they have a volume and are made up of molecules or atoms that typically take up some space than the ideal atoms. The ideal gas pattern manages to break at moderate temperatures level or greater pressures point when intermolecular energies and molecular mass enhances to be significant.

During a scientific investigation, which step will a scientist perform first?

Answers

Answer:

you need to have a question or a problem first

Pleaseeeeeeeeeeeeee please helpYou have learned that the atomic number of a chemical is the number of protons found in the nucleus. Atomic numbers can be used to find the number of neutrons and electrons in an atom. In this project, you will practice atomic mass and atomic mass number calculation as well as fill out a chart using the periodic table. Don’t forget to read through the rubric below, so you will know what you will be graded on. When you are ready, upload it replacing the “Lastname” in the saved document name with your last name.
Part I:
The atomic number of the sodium atom is 11. The atomic mass number can be estimated by rounding the atomic mass to 23. From this information, you can find the number of neutrons: 11 protons plus how many neutrons equals a mass number of 23? The number of neutrons would have to be the difference between 23 and 11, which is 12. This fact can be restated this way: 11 protons plus 12 neutrons equals a mass number of 23. For every proton in the nucleus, an electron revolves around the nucleus. Since 11 protons are in sodium, 11 electrons must be in sodium.
Using this information and the Periodic Table from lesson titled Periodic Table fill in the chart below.

Element Atomic Number Atomic Mass How many neutrons? How many electrons? How many protons?
Sodium 11 23 12 11 11
Chlorine
Carbon
Lead
Iron
Magnesium
Uranium
Cobalt
Calcium
Platinum
Phosphorus