The substance argon has the following properties: normal melting point: 83.9 K normal boiling point: 87.4 K triple point: 0.68 a
tm, 83.8 K critical point: 48 atm, 150.6 K A sample of argon is initially at a pressure of 49.6 atm and a temperature of 101.4 K. The pressure on the sample is reduced to 0.680 atm at a constant temperature of 101.4 K. Which of the following are true? Choose all that apply The final state of the substance is a gas. The gas initially present will solidify. The final state of the substance is a solid. The sample is initially a liquid. One or more phase changes will occur.
1 answer:
Answer:
The final state of the substance is a gas.
The sample is initially a liquid. One or more phase changes will occur.
Explanation:
Let's consider the phase diagram for Argon (not to scale).
<em>A sample of argon is initially at a pressure of 49.6 atm and a temperature of 101.4 K. The pressure on the sample is reduced to 0.680 atm at a constant temperature of 101.4 K. Which of the following are true? Choose all that apply </em>
<em>The final state of the substance is a gas.</em> TRUE. At 0.680 atm and 101.4 K, the substance is a gas.
<em>The gas initially present will solidify.</em> FALSE. Initially, Ar is present as a liquid.
<em>The final state of the substance is a solid.</em> FALSE.
<em>The sample is initially a liquid. One or more phase changes will occur.</em> TRUE. The sample is initially liquid and only one phase change will occur.
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<u>Answer:</u>
<em>Bronsted Lowry Theory</em>
<em> is the acid </em>
<em> is the base </em>
<em> is the conjugate acid and </em>
<em> is the conjugate base</em>
<u>Explanation:</u>
Bronsted Lowry Theory:
An acid is a substance that can donate one or more protons
A base is a substance which can accept one or more protons
Hydrogen atom which is neutral (No Charge) contains 1 positive proton, 1 negative electron and 0 neutral neutron.
Thus Hydrogen atom has no Charge and it is neutral.
When an hydrogen atom loses an electron, Hydrogen ion is formed, which will contain 1 positive proton and 0 negative electron and 0 neutral neutron.
Thus Hydrogen ion has a positive charge.
Hydrogen ion is also called as a proton since it has only 1 proton in it.
Hydrogen ion in water that is,
is called as Hydronium ion.
Acid loses H+ (proton) to form conjugate Base
Base gains H+ (proton) to form conjugate Acid
For example
Let us consider the example given in the question
can be written as (removed 1
from both the sides )
or
reversing the equation
is the acid which donates
to form
is the base which gains
to form
is the conjugate base and
is the conjugate acid
So
is the acid
is the base
is the conjugate acid and
is the conjugate base
(Answer)
