CHEMISTRY HIGH SCHOOL

The temperature at which a substance boils is an example of a physical property.a. True
b. False

Answers

Answer 1
Answer: A physicalproperty is any property that does not concern with the change of the substance.The changes in the physical property can be used to describe itstransformations or evolutions from its initial state. They are often referredto as observables. Temperature at which asubstance boils is an example of a physical property. The temperature at which a substance boils describes astate of a physical system. It describes the transformation of a liquid fromits liquid state to its vapor by increasing its temperature.
Answer 2
Answer:


The answer would be (a.)True.

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For the amino acid alanine, the major species in solution at pH 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a p K a of 3 . The amino group of alanine has a p K a of 8 . Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7 .

Answers

Answer: ratio is 10⁻⁵

Explanation:

From Acid-dissociation equilibrium constant, HA is given thus,

HA + H₂O  ⇄ H₃O⁺ + A⁻

equilibrium constant, Ka = [H₃O⁺] [A⁻] / [HA]

[H₃O⁺]  = Ka [HA] / [A⁻]

from this we have that

pH = -log[H₃O⁺]

and pKa = -logKa

Applying Henderson-Hassel bach equation;

pH = pKa + log  [A⁻]/[HA] ...........(1)

A⁻ rep the salt and HA rep the acid

at a given pH of 7, the pKa value of carboxylic acid COOH is 3

∴ from equation (1).

7 = 3 + log(COO⁻/COOH)

log(COO⁻/COOH) = 4

thus (COO⁻/COOH) = 10⁻⁴ ...................(2)

The ratio of alanine COOH to COO- at pH 7 is  (COO⁻/COOH) = 10⁻⁴

(ii) Also considering the ratio of alanine NH2 to NH3+ at pH 7  we have;

given Pka value is 8,

therefore pH = pKa + log [salt]/[base]

7 = 8 + log (NH₂/NH₃)

(NH₂/NH₃) = 10⁻¹

thus the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7 is;

10⁻⁴ ˣ 10⁻¹ = 10⁻⁵

cheers i hope this helps

What is the reaction between aspirin and hydrochloric acid

Answers

According to Bronsted-Lowry reaction- an acid is any substance that donates a proton (H+ ion) to another substance hence these two substance are acid aspirin (acetylsalicyclic acid) and hydrochloric acid (HCl). And there are two pairs - an acid with a corresponding conjugate base and a base with a corresponding conjugate acid. These pairs are called conjugate acid-base pairs.

Which of the following conditions would most likely affect the rate of a chemical reaction? A. Increasing the number of reaction steps B. Decreasing the size of the reaction vessel C. Decreasing the amount of air in the reaction vessel D. Increasing the concentration of reactants

Answers

"D. Increasing the concentration of reactants" would most likely affect the rate of a chemical reaction since the other options only affect the environment. 
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True
False

Answers

True, because most chemical reactions have more moles but not really.
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(B) S
(C) N
(D) Ca
(E) Cl

Answers

The answer should be (D) Ca, because all others either occur as diatomic or are anions.

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Answers

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