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Klio2033 [76]
3 years ago
6

A single replacement reaction is a reaction in which one element replaces a similar element within a compound. True False

Chemistry
2 answers:
Andru [333]3 years ago
6 0

Answer:

true

Explanation:

the people above is correct

NNADVOKAT [17]3 years ago
3 0

Answer:

True

Explanation:

In a single replacement reaction, one element is replacing a similar element within a given compound.

For example;

       A  + BC → AC + B

The replacement of a metallic ion in solution by a metal ion higher in the activity series than the metal in solution falls into this category of reactions.

The relative position of the two elements in the activity series provides the driving force for the single replacement reactions.

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As water is cooled from 4º C to 0°C, its density
frosja888 [35]

Answer:

decreases

Explanation:

3 0
3 years ago
ASAP PLEASE
dimaraw [331]
The mass of Hydrogen is 2 g/mol
The mass of Helium is 4 g/mol
6 0
3 years ago
The pKa of lactic acid is 3.9. A lactate buffer will be useful from pH values ________. The pKa of lactic acid is 3.9. A lactate
Vedmedyk [2.9K]

Answer:

Explanation:

The usefulness of a buffer is its ability to resist changes in pH when small quantities of base or acid are added to it. This ability is the consequence of having both the conjugate base and the weak acid present in solution which will consume the added base or acid.  

This capacity is lost if the ratio of the concentration of conjugate base to the concentration of weak acid differ by an order of magnitude. Since  buffers having ratios differing by more will have their pH driven by either the weak acid or its conjugate base .

From the Henderson-Hasselbach equation we have that

pH = pKa + log [A⁻]/[HA]

thus

0.1 ≤  [A⁻]/[HA] ≤ 10

Therefore the log of this range is -1 to 1, and the pH will have a useful range of within +/- 1 the pKa of the buffer.

Now we are equipped to answer our question:

pH range = 3.9 +/- 1 = 2.9 through 4.9

7 0
3 years ago
(b) Once the ionic solid has dissolved, the anion that is formed is able to react as a base, with water as the acid. Write the n
Marrrta [24]

Answer:

b C₂H₃O₂⁻ + H₂O ⇄ HC₂H₃O₂ + OH⁻

e HC₂H₃O₂ + H₂O ⇄ H₃O⁺ + C₂H₃O₂⁻

f ka<<1

g. Weak acid molecules and water molecules

Explanation:

The water molecule could act as a base and as an acid, a molecule that have this property is called as amphoteric.

b The salt NaC₂H₃O₂ is dissolved in water as Na⁺ and C₂H₃O₂⁻. The reaction of the anion with water is:

<em>C₂H₃O₂⁻ + H₂O ⇄ HC₂H₃O₂ + OH⁻</em>

Where the C₂H₃O₂⁻ is the base and water is the acid.

e. The reaction of HC₂H₃O₂ (acid) with water (base), produce:

<em>HC₂H₃O₂ + H₂O ⇄ H₃O⁺ + C₂H₃O₂⁻</em>

f. As the acetic acid (HC₂H₃O₂) is a week acid, the dissociation in C₂H₃O₂⁻ is not complete, that means that <em>ka<<1</em>

g. The ka for this reaction is 1,8x10⁻⁵, that means that there are more <em>weak acid molecules</em> (HC₂H₃O₂) than conjugate base ions. Also, the <em>water molecules </em>will be in higher proportion than hydronium ions.

I hope it helps!

4 0
3 years ago
What is the product of radioactive decay symbolized by y called?
shepuryov [24]

Answer:

(B) Gamma wave

Explanation:

no explanation required.

7 0
1 year ago
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