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bearhunter [10]
4 years ago
12

Mike is conducting an experiment inside an Erlenmeyer flask, and he has the top of the flask sealed with a balloon to capture an

y gaseous products that may be produced. Is Mike's experimental setup an example of a closed, open, or isolated system
Chemistry
1 answer:
zhenek [66]4 years ago
5 0

Answer:

Closed system

Explanation:

In order to do this, let's remember the concepts of an open, closed and isolated system.

Open system: Any matter and heat can enter or leave the system.

Closed system: any matter cannot enter or leave the system, however heat can enter or leave the system.

Isolated system: neither matter nor heat can enter or leave the system.

Now, an open system cannot be, cause the flask is sealed at the top with a balloon, so matter cannot escape the system.

Now, in general terms, an erlenmeyer flask is not insulated to prevent that any heat or energy can be transfered, hence, the system, even with the balloon to prevent any escape of the gaseous product, it can still transfer heat or energy to the medium. This can be verified by touching the balloon or flask, therefore, is a closed system.

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Tris is a weak base. The basic form of tris can be written tris0 and the protonated (conjugate acid) form can be written tris. T
Arada [10]

Answer:

a) [Tris0] : [Tris] = 1 : 100

b) Range = 7.1 to 9.1

Explanation:

a) Calculation of ratio of the basic and the acidic forms of tris

pH of a buffer is calculate using Henderson-Hasselbalch equation

pH = pKa+log\frac{Salt}{Acid}

Conjugate acid of Tris dissociated as

Tris \leftrightharpoons Tris0 + H^+

For tris,

Salt or Basic form = tris0

Acid or Acidic form = Tris

pKa = 8.1

pH = 6.1

pH = pKa+log\frac{Tris0}{Tris}

6.1 = 8.1+log\frac{Tris0}{Tris}

log\frac{Tris0}{Tris} = -2

\frac{Tris0}{Tris} = antilog (-2)

\frac{Tris0}{Tris} = 10^{-2}

[Tris0] : [Tris] = 1 : 100

b) Range of Tris

Range of any buffer is:

From (pKa -1) to (pKa+1)

So, range of Tris is:

From (8.1 - 1) to (8.1 +1)

or from 7.1 to 9.1

8 0
3 years ago
Why are redox reactions often written as net ionic equations?
Scorpion4ik [409]

Answer:

A. To focus on only those ions that form the precipitate

Explanation:

Net ionic equations cancel out the ions that appear on both sides of the reaction because they essentially don't participate in the reaction. This is very useful when dealing with redox reactions because are complicated enough without spectator ions being in the way, so they help focus on those ions that actually form the precipitate.

Key Terms

  • Spectator Ions: an ion that does not take part in the chemical reaction.
  • Net ionic equations: a equation where  ions that appear on both sides are canceled out.
  • Redox reaction: an oxidation-reduction reaction.
3 0
3 years ago
In 2-3 sentences, explain WHY the Elodea cells placed in the salt solution look different than they do in water. Include in your
ZanzabumX [31]

Answer:

The phenomenon of plasmolysis.

Explanation:

When cells of Elodea are placed in a salt solution the phenomenon of plasmolysis occurs and the water will start to move out from the cell. The concentration of salts in the cell will get high due to the diffusion of salt molecules inward. The organelles will look like as they are centered to the cell by hook.

5 0
3 years ago
The end point indicates the completion of the titration by physical change (which is
saveliy_v [14]
Your answer would be, true.
8 0
3 years ago
Which one of the following characteristics indicates the presence of weak intermolecular forces in a liquid?A) none of the above
grin007 [14]

Answer:

C) a low heat of vaporization.

Explanation:

It is C) a low heat of vaporization.

Low heat of vaporization means less amount of energy is required to vaporize a liquid. This further means the liquid has weaker intermolecular force of attraction that is why on provide lesser heat only it vaporizes.

Low vapor pressure, high boiling point and high critical temp. all contribute to strong intermolecular forces in a liquid

6 0
3 years ago
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