The bird bobbed its head up and down. A) qualitative B) quantitative

8. When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. I

Tamiku [17]

Answer:

The boiling point of the water by adding 2.5 moles of aluminium nitrate will be changed by 4° C.

Explanation:

Step 1: define the formula for an elevation of the boiling point

Δ T b = i *K b *bB

⇒with Δ T b = the elevation of the boiling point ( in °C or Kelvin)

⇒with i = van't Hoff i -factor for the solute. The factor i shows the number of individual particles (typically ions) that are formed by a compound in the solution.

⇒ with Kb = ebullioscopic constant, which depends on the properties of the solvent. (Eventually can be calculated).

⇒ with bB= the molal concentration (molality) of the solute.

Since we have 2 different solutions ( component 1 = sugar and component 2 = aluminium nitrate) of the same molality in the same solvent ( water). We can express this as followed:

Δ T b,2 / Δ T b,1 = (i2 * Kb * bB ) / (i1 * Kb *bB)

⇒after he was simplifying this becomes:

Δ T b,2 / Δ T b,1 = i2 / i1

⇒ Now we can isolate either Δ T b,2 or Δ T b,1:

Δ T b,2 =(i2/i1) x Δ T b,1

Sugar

⇒ is a covalent compound, so it doesn't dissociate in water ⇔ i1=1

Aluminium nitrate

⇒ it's a soluble ionic compound and in solution it will dissociate as the following equation:

Al(NO3)3 (aq) → Al3+(aq) + 3NO3- (aq)

⇒thus here are 4 particels formed : 1 Al3+ + 3NO3-

i2=4

As given, we also know that the temperature was raised by 1°C after adding sugar ⇒ Δ T b,1 = 1°C

Step 2: insert all the numbers in the formula for boiling point elevation

(i2/i1) x Δ T b,1

(4/1 ) x 1°C = 4°C

⇒ The boiling point of the water by adding 2.5 moles of aluminium nitrate will be changed by 4°C

6 0

3 years ago

How many grams of hydrogen is needed to produce 12 grams of water?

Nutka1998 [239]

6 grams.........................

5 0

3 years ago

When encountering another vessel in darkness or reduced visibility, what do visible red and green lights indicate?

Nonamiya [84]

When encountering another vessel in darkness, the visible white, red and green lights indicate you are approaching a powerboat head-on.

In this case neither vessels has the right of way. Both boat operators must take early action to stay out of the way for other vessels. The operators must reduce their speed and steer to starboard.

<h2>Further Explanation</h2>

The visible white, red and green lights are all navigation lights with different purposes. However, the four common navigational lights are sidelights, sternlight, Masthead light and all-round white light.

Sidelights are also referred to as combination lights. It is the combination of red and green light and visible to another vessel that approaching head on or from the side. The green light is the boat starboard (right hand side) and the red light is the port side (left) of a vessel.

The sternlight is the white light seen from behind the vessel.

The masthead light is a white light. The white light shines forward to all sides of the vessels. It is on all power driven vessels.

All-round white light is a white light used to combine sternlight and masthead light to form a single white light so that it can boldly be seen by other vessels.

LEARN MORE:

navigational lights brainly.com/question/4603065

KEYWORDS:

boat
head-on
masthead light
white light
operators

7 0

3 years ago

Read 2 more answers

A solution with a volume of 1.00 l is 0.450 m in ch 3 cooh(aq) and 0.550 m in ch 3 coona(aq). what will the ph be after 0.0800 m

Semenov [28]

Before addition of HCl,

conc. of CH3COOH = 0.450 M
conc. of CH3COONa = 0.550 M

After addition of 0.08 M HCl, following reaction occurs in system:
HCl + CH3COONa ↔ CH3COOH + NaCl

Thus, in reaction system conc. of CH3COOH will increase to 0.53 M (0.08M + 0.450M)
And, conc to CH3COONa will reduce to 0.47 M (0.550M - 0.08M)

Now, conc. of H+ ions = ka $\frac{[acid]}{[conjugated base]}$
where ka = dissociation constant for acid = 10^-5 for Ch3COOH

∴ conc. of H+ ions = $\frac{0.53}{0.47}$
= 1.1277 x 10^-5

Now, pH = -log [H+] = -log (1.1227 x 10^-5) = 4.94

4 0

3 years ago

Diego has learned that the Earth wobbles on its axis in a certain pattern. He predicts that this pattern will repeat every 20,00

nataly862011 [7]

Observe the movment of other planets would be your answer

8 0

3 years ago

Read 2 more answers

The bird bobbed its head up and down.A) qualitativeB) quantitative ​

The bird bobbed its head up and down.A) qualitativeB) quantitative