Explanation:
- Evaporation is defined as a process in which liquid state of water is changing into vapor state.
So, we need to break the bonds of liquid substance in order to convert it into vapor state. And, energy is absorbed for breaking of bonds which means that evaporation is an endothermic process.
Hence, the statement evaporation of water is an exothermic process is false.
- When a hydrocarbon reacts with oxygen and leads to the formation of carbon dioxide and water then this type of reaction is known as combustion reaction.
A combustion reaction will always release heat energy. Hence, combustion reaction is exothermic in nature.
- When energy is transferred as heat from the surroundings to the system then it means energy is being absorbed by the system. And, absorption of heat is an endothermic process for which is positive.
- Whereas when energy is transferred from system to the surrounding then it means energy is released by the system which is an exothermic process.
Hence, for an exothermic process value of is negative.
Thus, we can conclude that statements which are true are as follows.
- A combustion reaction is exothermic.
- When energy is transferred as heat from the system to the surroundings, is negative.
- For an endothermic reaction Deta H is positive.
S²⁻ cannot be reduced further.
<u>Explanation:</u>
S²⁻ cannot be reduced further
In the periodic table, Sulphur has the atomic number of 16.
So, the arrangement of electrons in the orbits would be 2, 8, 6
The outermost orbit has 6 electrons.
It can gain two more electrons to complete its outermost orbit and the valency of the sulphur then becomes 2-
Therefore, in S²⁻ the valence electrons are complete in the outermost orbit and cannot gain more electrons. Therefore, it cannot get reduced further.
Asteroids This is a matter of knowing the definitions. Although the biggest hint is "Make up a belt between Mars and Jupiter" which should cause you to immediately think "Asteroid Belt". But let's look at the options and see what fits.
Comets - Mostly comprised of ice and dust. They're not "rocky", so this isn't a good choice.
Asteroids - Nothing the lecture describes conflicts with what an asteroid is, so this is the correct choice.
Meteor - Key thing here is a meteor is that a meteor is a small body that's burning up in the Earth's atmosphere, causing a streak of light. And that's not what the lecture is describing, so this is a bad choice.
Meteoroids - This is a body orbiting the sun, that will in the future become a meteor. And that's not something in a stable orbit between Mars and Jupiter. So this is also a bad choice.
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Answer:
Following are the solution to these question:
Explanation:
Calculating the mean:
Calculating the standardn:
Please find the correct equation in the attached file.
For point a:
For point b:
For point c:
It is calculated by using the slope value that is . The slope value is ambiguous.