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3 years ago

From left to right, the three regions of a phase diagram represent the _____ of a substance.

Chemistry

2 answers:

timofeeve [1]3 years ago

5 0

Your answer is D.

:good luck

olya-2409 [2.1K]3 years ago

5 0

Answer: D solid phase, liquid phase, and gas phase

Explanation: The phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. The temperature is usually plotted on X axis and pressure is plotted on Y axis.

Thus as we increase the temperature and move from left to right the phase will change from solid and liquid as the kinetic energy of the molecules will increase and on further increasing the temperature, the liquid phase will change to gaseous phase as molecules will gain more kinetic energy on further increasing the temperature.

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Write a balanced equation for the dissolution of sodium carbonate (Na2CO3) in water. Find the number of moles of Na+ produced wh

DochEvi [55]

Answer:

in the presence of water H2O

Na2CO3 (S) --> 2Na+ (aq)+ (CO3)2-(aq)

One mole of sodium carbonate produces two moles of Na+ ions

Therefore 0.207 moles produces 0.414 moles of Na+ ions

= 0.414 moles of Na+ ions

Explanation:

In water

Na2CO3 --> 2Na+ (aq)+ (CO3)2-(aq)

In a limited reaction, the carbonate ion reacts with the water molecules as follows

(CO3)2-(aq) + H2O←→HCO3-(aq) + OH-(aq)

sodium carbonate or soda ash dissolves in water to give 2 sodium cations and one carbonate anion

4 0

3 years ago

An acetic acid buffer solution is required to have a pH of 5.27. You have a solution that contains 0.010 mol of Acetic acid. Wha

dlinn [17]

Answer:

Molarity of sodium acetate you will need to add is 0.0324M

Explanation:

Assuming volume of the buffer is 1L.

The pH of a buffer can be determined using Henderson-Hasselbalch equation:

pH = pKa + log [A⁻] / [HA]

Where pKa is pKa of the weak acid, [A⁻] molar concentration of conjugate base and [HA] molar concentration of weak acid

Replacing for the acetic buffer (pKa = 4.76):

pH = 4.76 + log [Sodium Acetate] / [Acetic Acid]

As you have 0.010 moles of acetic acid in 1L:

[Acetic Acid] = 0.010mol / 1L = 0.010M

And you require a pH of 5.27:

5.27 = 4.76 + log [Sodium Acetate] / [0.010M]

0.51 = log [Sodium Acetate] / [0.010M]

10^0.51 = [Sodium Acetate] / [0.010M]

3.236 = [Sodium Acetate] / [0.010M]

3.236 [0.010M] = [Sodium Acetate]

0.0324M = [Sodium Acetate]

<h3>Molarity of sodium acetate you will need to add is 0.0324M</h3>

7 0

3 years ago

Help with this one too please !

satela [25.4K]

The second one and the 2 last ones

4 0

2 years ago

Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that _____.

34kurt

Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that atoms are divisible. The answer is letter C

8 0

3 years ago

Read 2 more answers

Tim wants to store 0.122 moles of helium gas at 203 kPa and 401 K. Which is the volume of the helium gas needed for storage?

algol13

The volume of Helium gas needed for storage is 2.00 L (answer C)

calculation

The volume of Helium is calculated using ideal gas equation

That is Pv =nRT

where;

P( pressure) = 203 KPa

V(volume)=?

n(number of moles) = 0.122 moles

R(gas constant) = 8.314 L.Kpa/mol.K

T(temperature)= 401 K

make V the subject of the formula by diving both side by P

V=nRT/p

V={[0.122 moles x 8.314 L. KPa/mol.K x 401 K] / 203 KPa} = 2.00 L

3 0

3 years ago