All categories

3 years ago

Filtration and dialysis are techniques that rely on differences in particle size to separate mixture components. True False

Chemistry

2 answers:

bazaltina [42]3 years ago

6 0

Answer: True

Explanation:

Filtration and dialysis are analytical techniques which are used to separate the particles present in the solution.

The particles that is having a bigger size will be left at the bottom in the solution and the smaller particles will be at the top.

This is because the smaller particles are light in weight and large weight are heavier. Both of the methods are used as a purification technique for the separation of impurities from the solution based on the particle size.

soldier1979 [14.2K]3 years ago

3 0

This is true. Think about when you make pasta. The colander acts as a filter and doesn't let the past a through but allows the extra water to escape because the pasta is too big to fit.

You might be interested in

How was hubble important to our understanding of galaxies

stellarik [79]

The Hubble Telescope allowed us as humans to "travel" to the deepest parts of the universe and view the galaxies that are lightyears away from Earth.

3 0

3 years ago

For a reaction that follows the general rate law, Rate = k[A][B]2, what will happen to the rate of reaction if the concentration

sleet_krkn [62]

Answer:

The rate will increase by a factor of 5.00 too.

Explanation:

Hello,

In this case, given the rate law:

$r=k[A][B]^2$

Thus, we can notice it is first-order respect to A, for that reason, increasing its concentration by a factor of 5.00, increase the rate by a factor of 5.00 as well.

Moreover, if the concentration of B is increased by the same factor, the rate will increase by a factor of 25.00, since the rate is second-order respect to B (it is squared).

Best regards.

5 0

3 years ago

To understand several methods of measuring gas pressure. Gases exert a measurable pressure (P) on the walls of their container.

sammy [17]

Answer:

1. 0.9539 atm

2. 3112.732 mmHg

3. The third question is an incomplete one, as a diagram showing a gas tube with a measurement of the mercury-filled manometer should be included in the question. This will enable easy calculation of the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer. However, an example is explained to give a clear understanding on how it's been calculated.

Explanation:

1. On a rainy day, a barometer reads 725 mmHg. Convert this value to atmospheres.

The answer is:

1 atm=760 mmHg=101,325 Pa

so, 725 mmHg to atm =

725 mmHg ÷ 760 mmHg = 0.9539 atm

2. A closed container is filled with oxygen. The pressure in the container is 415 kPa. What is the pressure in millimeters of mercury?

The answer is :

1 atm=760 mmHg=101,325 Pa

First, 415 kPa should be converted to pa

1 kPa = 1000 pa

415 kPa = 415,000 pa

Afterwards, pa should be converted to atm

415,000 pa ÷ 101,325 Pa = 4.0957 atm

Finally, atm should be converted to mmHg

4.0957 × 760 = 3112.732 mmHg

3. What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer?

The answer is:

atmospheric pressure = density of mercury x acceleration due to gravity x height of column of mercury.

Let us use for instance, 20 cmHg as the pressure in the gas. To find pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer, we have,

0.95atm + ( (20cmHg x 10mm) ÷ 1cm) ) x (1atm ÷ 760mmHg) = 1.21 atm

where, 0.95atm is the atmospheric pressure.

6 0

3 years ago

4. Describe the arrangement of the electrons on each energy level.

never [62]

Answer:

Explanation:

If the energy of an atom is increased, an electron in the atom gets excited. To go back to its ground state, the electron releases energy. The energy of the light released when an electron drops in energy level is the same as the difference in energy between the two levels.

Viewed simply, electrons are arranged in shells around an atom’s nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. An atom’s electron shell can accommodate 2n2 electrons (where n is the shell level).

In a more realistic model, electrons move in atomic orbitals, or subshells. There are four different orbital shapes: s, p, d, and f. Within each shell, the s subshell is at a lower energy than the p. An orbital diagram is used to determine an atom’s electron configuration.

There are guidelines for determining the electron configuration of an atom. An electron will move to the orbital with lowest energy. Each orbital can hold only one electron pair. Electrons will separate as much as possible within a shell.

7 0

3 years ago

Consider this reaction: acid + base salt + water. What type of reaction is this?

Sati [7]

Acid + base ---> Salt + water is a neutralization reaction

5 0

3 years ago

Read 2 more answers