All categories

3 years ago

Students were asked to place a mint in their mouths and determine how long it took for the mint to dissolve. The

Chemistry

1 answer:

saveliy_v [14]3 years ago

4 0

B. The time is likely between 40 - 80 seconds.

<u>Explanation:</u>

One group of students were asked to leave a whole mint in their mouth, not moving it around, and let it dissolve, which takes very long time to dissolve since there is lower frequency of collision among the saliva particles and mint.

Another group swirled a whole mint around in their mouths, so the frequency of collision between the saliva and the mint particles increases, there by increase in dissolving capacity, but the timing will be lesser when compared to other groups used mints broken into smaller pieces.

So the time for swirling is likely between 40 - 80 seconds.

You might be interested in

It is desired that an acetic acid sodium acetate buffered solution have a pH of 5.27. You have a solution that has an acetic aci

SVETLANKA909090 [29]

Answer:

0.034 M is the molarity of sodium acetate needed.

Explanation:

The pH of the buffer solution is calculated by the Henderson-Hasselbalch equation:

$pH = pK_a + \log \frac{[A^-]}{[HA]}$

Where:

pK_a= Negative logarithm of the dissociation constant of a weak acid

$[Ac^-]$ = Concentration of the conjugate base

[HA] = Concentration of the weak acid

According to the question:

$HAc(aq)\rightleftharpoons Ac^-(aq)+H^+(aq)$

The desired pH of the buffer solution = pH = 5.27

The pKa of acetic acid = 4.74

The molarity of acetic acid solution = [HAc] = 0.01 M

The molarity of acetate ion = $[Ac^-] = ?$

Using Henderson-Hasselbalch equation:

$5.27= 4.74 + \log \frac{[Ac^-]}{[0.01 M]}$

$[Ac^-]=0.0339 M\approx 0.034M$

Sodium acetate dissociates into sodium ions and acetate ions when dissolved in water.

$NaAc(aq)\rightarrow Na^+(aq)+Ac^-(aq)\\$

$[Ac^-]=[Na^+]=[NaAc]= 0.034M$

0.034 M is the molarity of sodium acetate needed.

3 0

3 years ago

5.Are pure solids included in equilibrium expressions? Explain your answer.

tatiyna

Answer:

Pure solids or liquids are excluded from the equilibrium expression because their effective concentrations stay constant throughout the reaction. The concentration of a pure liquid or solid equals its density divided by its molar mass.

Explanation:

Hope this helps!!!

8 0

3 years ago

An object has a weight of 5.10 Newtons (N) at sea level, where the acceleration due to gravity is 9.81 m/s2.

RUDIKE [14]

Well, you could get the mass as $m=\frac{G_0}{g_0}$ ad then $g_1=\frac{G_1}{m}$ , where $G_0$ is the sea level weight, $g_0$ the sea level accel., $g_1$ the accel. above while $G_1$ the weight above.

8 0

3 years ago

Read 2 more answers

States of Matter Escape Room

iris [78.8K]

Answer:

Explanation:

matter has mass and undergoes a phase change

3 0

2 years ago

What is the application of chemistry

vlabodo [156]

Answer:

Chemistry plays an important and useful role towards the development and growth of a number of industries. This includes industries like glass, cement, paper, textile, leather, dye etc. We also see huge applications of chemistry in industries like paints, pigments, petroleum, sugar, plastics, Pharmaceuticals.

3 0

3 years ago