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3 years ago

An alpha particle has a mass number of 2. a. True b. False

1 answer:

5 0

B. False. An alpha particle is a Helium nucleus which has a mass of 4 as it is made from 2 neutrons and protons each with mass of +1.

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Why amino acids are soluble in pH=3 or pH=10 solutions more than it dissolves in pH=7 solutions?

Ray Of Light [21]

Answer:

Solubility is Affected by pH

The pH of an aqueous solution can affect the solubility of the solute. By changing the pH of the solution, you can change the charge state of the solute.

At pH extremes, the amino acid molecules mostly carry a net charge, thus increasing their solubility in polar solvent. At very low or very high pH, the amino acid molecules have increased charge, thus form more salt bonds with water solvent molecules.

An isoelectric point is the pH at which an amino acid exists as its zwitterion. A zwitterion is the dipolar ionic form of an amino acid. ... If the pH is lower (in acidic conditions) than the isoelectric point then the amino acid acts as a base and accepts a proton at the amino group. This gives it a positive change.

An amino acid is usually more soluble in aqueous solvent at pH extremes than it is at a pH near the isolelectric point of the amino acid. (Note that this does not mean that the amino acid is insoluble at a pH near its pI.)

Which of the following statements correctly explains this phenomenon?

(Select all that apply.)

The neutral charge of an amino acid molecule at its isoelectric point will make the molecule hydrophobic.

At pH extremes, the amino acid molecules mostly carry a net charge, thus increasing their solubility in polar solvent.

At very low or very high pH, the amino acid molecules have increased charge, thus form more salt bonds with water solvent molecules.

At pH values far from the isoelectric point, individual amino acid molecules have greater kinetic energy, thus more readily stay in solution.

<h2>Please mark me as brainliest</h2>

8 0

3 years ago

Find the mass of a metal cylinder that has a volume of 652 cm and a density of<br> 21.45 g/cm

GREYUIT [131]

<h2>Answer: 13985.4 g</h2>

Explanation:

Mass = volume × density

Mass = 652 cm³ × 21.45 g/cm³

= 13985.4 g

Explanation:

3 0

3 years ago

2 icl + h2i2 + 2 hcl is first order in icl and second order in h2. Complete the rate law for this reaction in the box below. Use

OleMash [197]

2 ICl + H2 ----> I2 + 2 HCl

as given that rate is first order with respect to ICl and second order with respect to H2

The rate law will be

Rate = K [ICl] [ H2]^2

b) Given that K = 2.01 M^-2 s^-1

Concentrations are

[ICl] = 0.273 m and [H2] = 0.217 m

Therefore rate = 2.01 X (0.273)(0.217)^2 = 0.0258 M / s

5 0

3 years ago

How does a parallel circuit differ from a series circuit?

victus00 [196]

I believe it is B. A series circuit has one path for electrons, but a parallel circuit has more then one path.

Could I Have brainliest?

6 0

3 years ago

Read 2 more answers

Calculate the molarity of a MgSosolution

svet-max [94.6K]

Answer:

Explanation:

because

7 0

3 years ago