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nignag [31]
3 years ago
15

In the phase diagram below, point B describes the critical point. TRUE FALSE

Chemistry
1 answer:
White raven [17]3 years ago
4 0
The critical point is said to be the end point of a phase diagram. The most known example is the liquid-vapor critical point, the point in a PT curve that signifies that at this point both vapor and liquid coexist. The critical point is characterized by a critical pressure and a critical temperature.
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Why is an oxygen molecule more stable than and oxygen atom ?
slava [35]

Answer:

Oxygen molecule is 2 oxygen atoms in a covalent bond, whereas an oxygen atom is an atom with 8 electrons (6 valence electrons).  

Thus, clearly, any element in a bonded state is always more stable than when in an un-bonded state.

Explanation:

7 0
3 years ago
Read 2 more answers
Hot asphalt poured onto flat ground cools to form a solid road surface. Chemical or physical change
Verdich [7]
<h2>Answer:</h2>

This is a physical change.

<h3>Explanation:</h3>

Hot asphalt is mixed with the sand crushed stones and spread onto the roads, when it gets dry it becomes hard giving a smooth straight surface of the road.

Asphalt is used to stick together stones and sand in the road.

It is a physical change because the phase of the asphalt changed from the liquid to solid.

At high temperature, asphalt is in liquid form and at room temperature, it is present in hard solid form.

6 0
3 years ago
A box contains 104 gas molecules, 2500 of nitrogen and 7500 of argon in thermal equilibrium. The molecular weight of N2 is 28g/m
LekaFEV [45]

Answer : The temperature of this gas will be, 206.9 K

Explanation :

The expression for the kinetic energy per molecule of monoatomic gas (argon) is:

K.E_{argon}=n_{argon}\times \frac{3}{2}\times K_BT      ...........(1)

The expression for the kinetic energy per molecule of diatomic gas (nitrogen gas) is:

K.E_{nitrogen}=n_{nitrogen}\times \frac{5}{2}\times K_BT      .............(2)

The total kinetic energy of the molecule will be,

K.E_{Total}=K.E_{argon}+K.E_{nitrogen}

Now put all the expression in this, we get:

K.E_{Total}=(7500)\times \frac{3}{2}\times K_BT+(2500)\times \frac{5}{2}\times K_BT

T=\frac{K.E}{17500\times K_B}

Now put all the given values in this expression, we get:

T=\frac{5\times 10^{-17}J}{17500\times (1.381\times 10^{-23}J/K)}

T=206.9K

Therefore, the temperature of this gas will be, 206.9 K

8 0
4 years ago
2. What are the names of the products when you mix an equal strength acid and alkali
dexar [7]
I think the answer is water and hydrochloric acid
8 0
3 years ago
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 1.20 MJ 1
mars1129 [50]

Answer : The mass of liquid sodium needed are, 3.17\times 10^3g

Explanation :

First we have to calculate the number of moles of liquid sodium.

q=n\times c\times (\Delta T)

where,

q = heat absorb = 1.20 MJ = 1.20 × 10⁶ J

n = number of moles of liquid sodium = ?

c = specific heat capacity = 30.8J/mol.K

\Delta T = change in temperature = 10.0^oC=273+10.0=283K

Now put all the given values in the above formula, we get:

1.20\times 10^6J=n\times 30.8J/mol.K\times 283K

n=137.7mol

Now we have to calculate the mass of liquid sodium.

Molar mass of Na = 23 g/mol

\text{Mass of Na}=\text{Moles of Na}\times \text{Molar mass of Na}

\text{Mass of Na}=137.7mol\times 23g/mol=3167.1g=3.17\times 10^3g

Therefore, the mass of liquid sodium needed are, 3.17\times 10^3g

3 0
4 years ago
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