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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.

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You will often work with salts of , , and in the laboratory. (All are found in nature, and all are important economically.) If y

Svetlanka [38]

Answer:

1) Fe³⁺

2) Al³⁺

3) Pb²⁺

Explanation:

Because all of the metal ion concentrations are the same, the order that they precipitate will be dependent on the $K_{sp}$ values of each individual precipitate. The lower the $K_{sp}$ , the less OH⁻ needed in solution to precipitate.

The three $K_{sp}$ values are

$K_{sp}$ = 2.6 x 10⁻³⁹ for Fe(OH)₃,

$K_{sp}$ = 1.9 x 10⁻³³ for Al(OH)₃

$K_{sp}$ = 1.4 x 10⁻¹⁵ for Pb(OH)₂

This means that the ions will precipitate in the following order Fe³⁺ then Al³⁺ then Pb²⁺

Note: if too much OH⁻ is added Al³⁺ will redissolve into solution because of the formation of the soluble complex Al(OH)⁻₄ ( $K_{f}$ = 1.1 x 10³³)

4 0

3 years ago

When sugar is burned, water vapor and carbon dioxide are produced.

Natalija [7]

Answer:

12 carbon, 22 hydrogen, 11 oxygen

Explanation:

Our equation is: Sugar + $12O_2$ ⇒ $11H_2O$ + $12CO_2$

This is already balanced which means that the number of atoms for each type of element on each side should be the same.

On the right side, there are 11 * 2 = 22 hydrogen atoms, 11 * 1 + 12 * 2 = 11 + 24 = 35 oxygen atoms, and 12 * 1 = 12 carbon atoms.

Currently on the left, there are 12 * 2 = 24 oxygen atoms. That means that sugar must have 11 oxygen atoms to balance it out. In addition, since the left side currently has no hydrogen or carbon atoms, those must belong to the sugar molecule.

Thus, the sugar molecule has 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

4 0

3 years ago

Why is the wave energy lower when it reaches the receiver? (Hint: think about what you know about visible light.)

kumpel [21]

Answer:

The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view.

More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.

Explanation

WAVELENGTHS OF VISIBLE LIGHT

All electromagnetic radiation is light, but we can only see a small portion of this radiation—the portion we call visible light. Cone-shaped cells in our eyes act as receivers tuned to the wavelengths in this narrow band of the spectrum. Other portions of the spectrum have wavelengths too large or too small and energetic for the biological limitations of our perception.

As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.

6 0

3 years ago

Read 2 more answers

adelina 88 [10]

Answer:

Similarity between photosynthesis and cellular respiration is that both process :

Involve production of energy

Exchange of gases

Goes through electron chain reactions

Explanation:

Photosynthesis : It is the process in which green plants containing chlorophyll prepare their food in the presence of Sunlight , water and carbon dioxide.This process occur inside chloroplast .

Here Food is prepared.Oxygen and food is produced as a result of photosynthesis .

The electrons triggers the reaction of food formation.

Energy is released during photosynthesis.

Gaseous exchange between CO2 and O2 occur.

Respiration :

It is the process in which living organism converts oxygen and food to water and carbon dioxide . Here energy is released in the form of ATP. It take place inside the mitochondria of the cell.

Exchange of Gases occur between organism and environment.

Here , mitochondrial electron transport occurs to produce ATP.

Hence , similarity between photosynthesis and cellular respiration is that both process:

Involve production of energy

Exchange of gases(carbon dioxide and oxygen)

Goes through electron chain reactions

7 0

3 years ago

How many moles of HBr are present in 250 ml of a 0.15 M HBr solution?

Fofino [41]

Answer:

0.0375 moles HBr

Explanation:

we are given;

Molarity of HBr solution as 0.15 M
Volume of the solution as 250 mL

We are required to determine the number of moles;

We need to know that;

Molarity = Moles ÷ Volume

Therefore;

Moles of HBr = Molarity of HBr solution × Volume of solution

Thus;

Moles of HBr = 0.15 M × 0.25 L

= 0.0375 Moles

Thus, the number of moles of HBr solute is 0.0375 moles

6 0

3 years ago