which of the following is not a mixture? a)antibiotic b)evaporated milk c)brewed coffee d)hydrogen chloride
Answers
Answer:
d) Hydrogen chloride
Explanation:
Hydrogen chloride (HCl) is not a mixture. It is a chemical compound composed of two elements, hydrogen (H) and chlorine (Cl), combined in a fixed ratio. In contrast, the other options (antibiotic, evaporated milk, brewed coffee) all involve mixtures:
Antibiotics are typically mixtures of various chemical compounds used for medicinal purposes.
Evaporated milk is a mixture of milk and water with the water removed.
Brewed coffee is a mixture of water and coffee grounds, often with other components like sugar or cream added.
Hydrogen chloride, on the other hand, is a pure compound with a defined chemical formula (HCl) and consistent composition.
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Which of the following is not part of daltons atomic theory
A particle that orbits the nucleus in an atom is called an
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According to one acid-base theory, the NH3(g) molecules act as
(1) an acid because they accept H+ ions
(2) an acid because they donate H+ ions
(3) a base because they accept H+ ions
(4) a base because they donate H+ ions
Answers
According to the Bronsted-Lowry concept of acids and bases, a base accepts protons. Here NH₃ accepts a proton to form the conjugate acid NH₄⁺. Hence, it acts as a base.
What is Bronsted-Lowry concept?
There are various theories regarding the nature of acids and bases. According Bronsted-Lowry concept of acids and bases, acids are substances which donates a proton and bases are proton accepters.
The species which is formed by donating a proton from the acid is called conjugate base of the acid and the species which is formed after a base accepts a proton is called the conjugate acid of the base.
Consider the given reaction of ammonia with water. Here water is a proton donor and thus acts as an acid whereas ammonia accepts the proton from water forming its conjugate acid NH₄⁺. Water forms its conjugate base OH-. Therefore NH₃ acts as a base in this reaction.
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What's more there are dipole-dipole forces.
FALSE
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Answer: False
False
Explanation:
False
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15.0 moles of ammonium sulfate are formed by the reaction of 30.0 moles of ammonia with sulfuric acid.
Let's consider the reaction between ammonia and sulfuric acid to produce ammonium sulfate.
2 NH₃ + H₂SO₄ ⇒ (NH₄)₂SO₄
The molar ratio of NH₃ to (NH₄)₂SO₄ is 2:1. The moles of (NH₄)₂SO₄ produced from 30.0 moles of NH₃ are:
15.0 moles of ammonium sulfate are formed by the reaction of 30.0 moles of ammonia with sulfuric acid.
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B. an increase in atomic radius and an increase in electronegativity.
C. a decrease in atomic radius and a decrease in electronegativity.
D. an increase in atomic radius and a decrease in electronegativity.
E. None of these answer choices is correct.
Answers
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, the correct option is option A.
What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Within a period, an increase in atomic number is usually accompanied by a decrease in atomic radius and an increase in electronegativity.
Therefore, the correct option is option A that is a decrease in atomic radius and an increase in electronegativity.
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