Often, the rock layers bookending the mass extinction are noticeably different in their compositions. These changes in the rocks show the effects of environmental disturbances that triggered the mass extinction and sometimes hint at the catastrophic cause of the extinction
Answer: Correct options are as follows.
- salt is not chemically bonded to water.
- salt and water retain their own chemical properties.
Explanation:
When salt is dissolved in water then it means that it is a physical change as salt has completely dissociated into ions but they are not chemically combined to the water molecules.
As a result, both salt and water will retain their chemical properties.
For example, NaCl when dissolved in water will dissociate as follows.
![NaCl \rightarrow Na^{+} + Cl^{-}](https://tex.z-dn.net/?f=NaCl%20%5Crightarrow%20Na%5E%7B%2B%7D%20%2B%20Cl%5E%7B-%7D)
Only the particles of salt have evenly distributed in water.
And, when a components of a salt chemically combine with another substance then it will form a new compound.
Therefore, we can conclude that salt dissolved in water is a solution, therefore:
- salt is not chemically bonded to water.
- salt and water retain their own chemical properties.
Answer:
The second one is the correct statement.
Explanation:
An atom consists of a dense, heavy, positively charged central part called nucleus. It consists of neutrons and protons.
The electrons revolves around the nucleus in circular paths. These electrons are called planetary electrons because they can be compared to various planets revolving around the sun and the nucleus is compared with sun.
Answer:
![2C_{10} H_{22(l)} + 31O2(g)--> 20CO_{2(g)} + 22H_{2}O_{(g)}](https://tex.z-dn.net/?f=2C_%7B10%7D%20H_%7B22%28l%29%7D%20%2B%2031O2%28g%29--%3E%2020CO_%7B2%28g%29%7D%20%2B%2022H_%7B2%7DO_%7B%28g%29%7D)
Explanation:
![2C_{10} H_{22(g)} + 31O2(g)--> 20CO_{2(g)} + 22H_{2}O_{(g)}](https://tex.z-dn.net/?f=2C_%7B10%7D%20H_%7B22%28g%29%7D%20%2B%2031O2%28g%29--%3E%2020CO_%7B2%28g%29%7D%20%2B%2022H_%7B2%7DO_%7B%28g%29%7D)
From the question, one can work out which states of matter to assign to which species. The trick with organic equations of this nature is to try to balance everything but oxygen first. Make sure you balance oxygen last because it is the easiest to balance.
Answer:0.0054314469917931 mole using the molecular weight calculator and the molar mass of MgBr2.
Explanation: