A pure chemical compound is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded.
A compound machine is that which is composed of two or more simple machines. Simple machines come in 6 basic types: (1) wheel and axle, (2) inclined plane, (3) wedge, (4) pulley, (5) screw, and (6) lever. Among the choices given above, the compound machine is the can opener for it is a combination of a wedge and a lever.
If an acid has a Ka of 4.3 × 10-⁷ and a base has a Kb of 5.6 × 10-⁴, then the true statement about the salt produced is that the salt would decrease the pH of the solution.
<h3>What is acid and base constant?</h3>
An acid dissociation constant, Kₐ, is a quantitative measure of the strength of an acid in solution while Kb indicates the high level of dissociation of a strong base.
According to this question, an acid has a Ka of 4.3 × 10-⁷ and a base has a Kb of 5.6 × 10-⁴. This shows that the strength of the base is higher than that of the acid.
Therefore, if an acid has a Ka of 4.3 × 10-⁷ and a base has a Kb of 5.6 × 10-⁴, then the true statement about the salt produced is that the salt would decrease the pH of the solution.
Learn more about Ka at: brainly.com/question/16035742
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Answer:
In an actual reaction, unless circumstances are absolutely perfect (which never occurs), the reactants do not completely react with one another. Theoretical yields are expected yields if every bit of each reactants completely reacts with the others.
The pressure of the gas is 2700 mmHg.
To solve this problem, we can use the <em>Combined Gas Laws</em>:
(<em>p</em>_1<em>V</em>_1)/<em>T</em>_1 = (<em>p</em>_2<em>V</em>_2)/<em>T</em>_2
<em>p</em>_2 = <em>p</em>_1 ×<em> V</em>_1/<em>V</em>_2 × <em>T</em>_2/<em>T</em>_1
<em>T</em>_2 = (-55+273.15) K = 218.15 K; <em>T</em>_1 = (33+273.15) K = 306.15 K
<em>p</em>2 = 760 mmHg × (0.50 m^3/0.10 m^3) × (218.15 K/306.15 K) = 2700 mmHg
