Out of all given options, determining if a rock is magnetic is an example of investigating an intensive property
Answer: Option C
<u>Explanation:</u>
Every element or compound consists of its unique physical and chemical properties. And these physical properties of the elements can be further classified as intensive and extensive physical properties. The intensive physical properties are the one which did not have any influence with the mass or amount of the element or compound. While the extensive properties will vary depending upon the amount and mass of the compound.
Thus, in this case, among the options given the investigations like weighing of sand, length of wire and recording volume of water will vary depending upon the size and amount of the inspecting substance. But the investigation of determining the magnetic nature of rock does not depend on the amount or size of the investigating substance.
Electrons are particles that have a negative charge. Therefore, an element in a neutral state will have the same number of protons and electrons.since the atomic number corresponds to the number of protons. atomic number of carbon is 6, so number of electron is also 6
To find the number of neutrons, you will need to subtract the atomic number from the atomic mass.
13 - 6 = 7 neutrons
<u>Answer:</u> The concentration of ethyl ethanoate at equilibrium is 
<u>Explanation:</u>
Given values:
Equilibrium concentration of ethanol = 
Equilibrium concentration of ethanoic acid =
The given chemical equation follows:
The expression of 
for above equation follows:
![K_c=\frac{[C_2H_5OH][CH_3COOH]}{[CH_3COOC_2H_5]}](https://tex.z-dn.net/?f=K_c%3D%5Cfrac%7B%5BC_2H_5OH%5D%5BCH_3COOH%5D%7D%7B%5BCH_3COOC_2H_5%5D%7D)
Putting values in above expression, we get:
![0.27=\frac{0.42\times 0.42}{[CH_3COOC_2H_5]}](https://tex.z-dn.net/?f=0.27%3D%5Cfrac%7B0.42%5Ctimes%200.42%7D%7B%5BCH_3COOC_2H_5%5D%7D)
![[CH_3COOC_2H_5]=\frac{0.42\times 0.42}{0.27}=0.653mol/dm^3](https://tex.z-dn.net/?f=%5BCH_3COOC_2H_5%5D%3D%5Cfrac%7B0.42%5Ctimes%200.42%7D%7B0.27%7D%3D0.653mol%2Fdm%5E3)
Hence, the concentration of ethyl ethanoate at equilibrium is
Answer: Option (C) is the correct answer.
Explanation:
The degree of randomness or disorder is known as entropy. This means that more randomly or rapidly the molecules of a substance are moving in a container or in the Universe more will be its entropy.
For example, gases move more rapidly that solids or liquids and hence gases have high entropy.
Therefore, we can conclude that entropy measures disorder.
The observation that indicates that the kinetic-molecular theory has limited use for describing a certain gas is that gas particles are obeying Newton's laws of motion. The correct answer is B.
