) If this substance is at the pressure and temperature of point E and the temperature is raised so that the pressure and temperature are equal to that of point F, what phase transition will occur?

Answers

Answer 1

Answer:

Answer:

The First-order phase transitions will occur.

Explanation:

The First-order phase transitions are those that involve a latent heat. During such a transition, a system either absorbs or releases a fixed (and typically large) amount of energy per volume while Second order phase transitions occur when a new state of reduced symmetry develops continuously from the disordered (high temperature) phase. The ordered phase has a lower symmetry than the Hamiltonian—the phenomenon of spontaneously broken symmetry.

There are six changes of phase that substances go through:

Freezing: liquid to solid.
Melting: solid to liquid.
Condensation: gas to liquid.
Vaporization: liquid to gas.
Sublimation: solid to gas.
Deposition: gas to solid.

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The ph of a buffer does not depend much on the concentrations of its acid–base conjugate pair because

Answers

Answer:

It could react with the present hydride or hydroxile ions.

Explanation:

Hello,

One the main features of buffers, is that when the acid-base conjugates are formed they could react with the added $H^+$ or $OH^(-1)$ in order to keep the pH as constant as its buffer capacity allows it.

Best regards.

Final answer:

A buffer solution maintains a stable pH primarily through the action of its acid-base conjugate pair reacting to counter changes, a property known as buffer capacity. High concentrations increase buffer capacity, allowing more acid or base to be neutralized. However, exceeding the buffer capacity can lead to pH changes.

Explanation:

The pH of a buffer solution doesn't greatly depend on the concentrations of its acid-base conjugate pair as the buffer's job is to keep the pH relatively constant. This is achieved by having appreciable amounts of its weak acid–base pair in the solution. If a strong acid or base is introduced into the system, the buffer pair reacts to counteract these changes. This is called buffer capacity.

For instance, consider a buffered solution composed of acetic acid and its conjugate base, acetate. The system can resist changes in pH upon addition of small quantities of an acid or base. This is because acetic acid and acetate can consume small additions of hydrogen ions (from an acid) or hydroxyl ions (from a base), keeping the overall pH stable.

When concentrations of the acid-base pair are high, the buffer capacity increases and hence more amounts of acid or base can be neutralized without a significant change in pH. However, there are limits to this capacity. If excessive amounts of acid or base are added, they may exceed the buffer's capacity, and its acid/base pairs will be either largely consumed or overrun, leading to changes in pH.

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Which reaction does not occur?2HF(aq) + Cl2(g) → F2(g) + 2HCl(aq)
2Na(s) + ZnF2(aq) + 2NaF(aq) + Zn(s)
O Fe(s) + CuCl2(aq) → FeCl2(aq) + Cu(s)
0 2HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)

Answers

Answer: $2HF(aq)+Cl_2(g)\rightarrow F_2(g)+2HCl(aq)$ will not occur.

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A general single displacement reaction can be represented as :

$X+YZ\rightarrow XZ+Y$

a) $2HF(aq)+Cl_2(g)\rightarrow F_2(g)+2HCl(aq)$

Flourine is more reactive than chlorine and hence this reaction cannot occur.

b) $2Na(s)+ZnF_2(aq)\rightarrow 2NaF(aq)+Zn(s)$

Sodium is more reactive than zinc and hence the reaction will occur.

c) $Fe(s)+CuCl_2(aq)\rightarrow FeCl_2(aq)+Cu(s)$

Iron is more reactive than copper and hence the reaction will occur.

d) $2HCl(aq)+Mg(s)\rightarrow MgCl_2(aq)+H_2(g)$

Magnesium is more reactive than hydrogen and hence the reaction will occur.

Which factor is MOST important in determining which minerals will form in a rock?A) The size of the rock.
B) The weight of the rock.
C) The hardness of the rock.
D) The composition of the rock.

Answers

The answer for this question is: The factor that is MOST important in determining which minerals will form in a rock D) The composition of the rock. This is because minerals actually exist as different chemical compounds. By knowing the chemical compounds present in a rock, you can find out what type of mineral is present as well.

Answer:

Its D.

Explanation:

I just took a usatestprep on it and it had the same question.

Which one has the less density?

Answers

Answer:

Large mass but not as much volume, so not as dense...

Explanation:

Answer:

Explanation:

You take the mass/volume to find density.

What is the affect of increasing the water's mass?how does it reflect it's temperature?

Answers

I assume what you're asking about is, how does the temperature changes when we increase water's mass, according the formula for heat ?
Well the formula is : $Q=m\cdot c\cdot \Delta t$ (where Q is heat, m is mass, c is specific heat and $\Delta t$ is change in temperature. So according this formula, increasing mass will increase the substance's heat, but won't effect it's temperature since they are not related. Unless, if you want to keep the substance's heat constant, in that case when you increase it's mass you will have to decrease the temperature

Which of the following is NOT a pure substance?a. milk
b. oxygen
c. water
d. carbon dioxide

Answers

Answer:

A) milk

Explanation:

Pure substances are materials that have constant chemical composition and physical and chemical properties as they do not change at constant pressure and temperature. Examples of pure substances are oxygen, water and carbon dioxide.

On the other hand, there are compound substances, which unlike simple substances are chemical compounds formed by atoms of different chemical elements, such as milk that is formed from elements from the blood of the animal and contains amino acids, fatty acids. , lactose and certain minerals.

Final answer:

Milk is the only option that is not a pure substance.

Explanation:

In this question, all the options are actually examples of pure substances except for milk. A pure substance is one that is made up of only one type of particle and cannot be separated into simpler substances by physical means. Milk, on the other hand, is a mixture of various components including water, proteins, fats, and sugars.

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