Answer:
correct option: 1
Explanation:
As given in the question that gas are taken from one sate to another state through different paths and asking which quantity will always remains same.
1. internal energy of gas is not path dependent so internal energy will remains same it depend only on the initial and final point .
2. Heat and work are path dependent means its matter the gas is taken by which path. so option 2 and 3 are wrong.
Answer:
law of conservation of mass
Explanation:
Answer: Land absorbs heat energy and releases heat energy quickly. Water absorbs heat energy and releases heat energy slowly. Global convection currents are set up in the atmosphere because of the unequal heating of Earth's surfaces.
Solution :
The reasons for the melting point determines :
- the assignment of the sample's purity
- identification of the unknown sample
- the conversion of solid sample to the liquid completely
In order to prepare the sample in the capillary tube for determining its melting point, we tap the tube gently into the sample with the open end of tube down. We then continue tapping the tube till the sample is couple of millimeters high.
Then the other close end of tube down, we tap the sample down again slowly or then dropping the tube into a longer tube so as to move down the sample faster.
Answer:
3.18x10⁻³
Explanation:
The equilibrium of a weak acid can be written as:
And Ka can be expressed as:
- Ka=
![\frac{[H^+][A^-]}{[HA]}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BH%5E%2B%5D%5BA%5E-%5D%7D%7B%5BHA%5D%7D)
<u><em>Keep in mind that [H⁺] = [A⁻]</em></u>.
We can<u> calculate [H⁺] from the pH</u>:
- [H⁺]=
=0.0158
Now we <u>compute the calculated [H⁺]</u> (and [A⁻]) <u>with the [HA] given by the problem</u>:
Ka = 
= 3.18x10⁻³
