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2 years ago

when performing solubility studies, why you should use deionized or distilled water rather than tap water?

Chemistry

1 answer:

Cerrena [4.2K]2 years ago

5 0

Answer:

The science project or the proposed test using the water as a control element in the experiment determines whether you choose to use deionized water or distilled water. Of the two, distilled water is the purest because the water undergoes boiling that kills off most organic contaminants.

Explanation:

HELP ME ON MINE PLZ

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n200080 [17]

Answer:

"Calculate" (and any subsequent words) was ignored because we limit queries to 32 words.

5 0

3 years ago

Define a physical change and give one example

ladessa [460]

Answer:

The definition of a physical change is: A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. The size or shape of matter may be changed but no chemical reactions occur.

An example of physical change is: crumbling a piece of paper or freezing water into ice.

7 0

3 years ago

PLEASE HELP ME WITH THIS QUESTION THIS FREAKING SUCKS

tigry1 [53]

Answer:

m = 0.122 m

Explanation:

Molality(m): A measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.

$\mathrm{Molality\:Formula}:\quad \mathrm m = \dfrac{ mole\:of\:solute }{ mass\:of\:solvent\:in\:kg }$

$\mathrm m = \dfrac{ mole}{ kg }$

$\mathrm{Substitute\:the\:numbers\:into\:the\:"Molality\:Formula"}$

$\mathrm m = \dfrac{ 0.250 }{ 2.05 }$

$\mathrm{Divide\:0.250\:by\:2.05\:and\:get\:0.12195122}$

$\mathrm m = {0.12195122}$

$\mathrm{Round\:to\:the\:nearest\:thousandths\:place}$

$\mathrm m = 0.122$

8 0

2 years ago

help plz Which list is in order from smaller to larger sediment particles? A. sand, silt, clay B. clay, silt, sand C. silt, sand

MariettaO [177]

Answer : The correct option is B (clay, slit, sand).

Explanation :

Soil particles are of three types : Sand, Slit and clay. Most of the soils particles are made up of a combination of sand, slit and clay.

Particle size range of the sand = 2.00 -0.05 mm

Particle size range of the slit = 0.05 -0.002 mm

Particle size range of the sand = less than 0.002 mm

Sand is the largest soil particle, clay is the smallest soil particle and slit particle is present in between the sand & clay particle.

Therefore, the order from smaller to larger sediment particles is

Clay > Slit > Sand

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3 years ago

calculate the standard potential arising from the reaction in which NADH is oxidized to NAD and the corresponding biological sta

melisa1 [442]

Answer:

-219.99kJ

Explanation:

The acronym '' NADH'' simply stands for what is known as coenzyme 1 with full meaning of Nicotinamide Adenine Dinucleotide Hydride. This substance is useful in the production of energy. The oxidation reaction of NADH causes it to produce NADP⁺ and the oxygen produces water when it is in the reduction process. The balanced equation for the oxidation reaction is given below as:

NADPH ---------------------------------------------------------------------> NADP⁺H⁺ + 2e⁻.

Also, the balanced equation for the reduction reaction is given below as:

$\frac{1}{2}$ O₂ + 2H⁺ + 2e⁻ --------------------------------------------------------------> H₂O.

It can be shown from the above REDOX reaction that the total number of electrons getting transferred is 2.

The Gibbs energy = -nFE. where n = 2, F = faraday's constant = 96485.3329 C and E = overall cell potential.

The overall cell potential = E[ reduction reaction] - E[oxidation reaction] = 0.82 - (- 0.32 ) = 1.14 V.

Hence, the Gibbs energy = - 2 × 96485.3329 × 1.14 = -219.99kJ

7 0

2 years ago