Answer: Option (d) is the correct answer.
Explanation:
It is known that sea water contains a large amount of common salt, that is, sodium chloride (NaCl). This salt is basic in nature.
Since, it is also known that species which have pH equals to 7 are basic in nature. Species which have pH less than 7 are acidic in nature and species which have pH greater than 7 are basic in nature.
Hence, due to the presence of common salt in sea water its surface is basic in nature.
Therefore, we can conclude that the normal pH of surface sea water is 9.0.
Magnesium oxide (MgO) is an ionic compound formed by the transfer of electrons from magnesium to oxygen, resulting both atoms being electronically stable. Its properties include having high melting and boiling points, being a good electrical insulator but a thermal conductor.
Magnesium oxide, often referred to as 'MgO,' is a compound comprised of two different elements: magnesium and oxygen. It is a type of ionic compound because it is formed by a metal, magnesium, and a non-metal, oxygen. This creation occurs through a process called ionic bonding, where the magnesium atom effectively donates two electrons to the oxygen atom. Consequently, both atoms achieve a stable electronconfiguration.
In its solid state, MgO takes a form of a white, crystal-like substance. It's generally known for its high melting and boiling points, reflecting the strong ionic bonds in oxide structure. Furthermore, the compound stands out for being a good electrical insulator, but a thermal conductor.
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a. True
b. False
Answer:
false is the correct answer,
Explanation:
The most abundant elements present in the body is carbon, oxygen, hydrogen, calcium, nitrogen, and phosphorus.
About 99 percent of the human body is made of ( carbon, hydrogen,oxygen, calcium, nitrogen, and phosphorus.) elements and 0.85 percent is made up of sulfur, sodium, potassium, chlorine, and magnesium and these all elements are abundant on Earth.
Thus the Elements abundant in the body are abundant on Earth.
a mixture of two common substances that can be separated by chemical means
a mixture of two common elements that can be separated by physical means
a pure substance that can be separated into different elements by chemical means
The second option is the answer. This is a mixture of two common substances that can be separated by chemical means.
NaCL is a compound that was formed through a chemical reaction between sodium and chlorine. In that reaction sodium which is a toxic metal combines with chlorine, a poisonous gas, to form a harmless but totally new compound NaCl or table salt.
Since the sodium ions have a positive charge and the chlorine ions have a negative charge, they are attracted to each other to form an ionic bond.
Sodium can only be separated from Chloride by chemical means e.g. electrolysis.
Answer: Option (d) is the correct answer.
Explanation:
A compound is defined as a substance which contains two different atoms that chemically combine together in a fixed ratio by mass.
A compound can be broken down into its constituent particles.
Pure substances are defined as the species which contains same type of atoms.
For example, NaCl is a pure compound and it can be separated into sodium and chlorine elements.
Thus, we can conclude that the statement a pure substance that can be separated into different elements by chemical means, best describes a compound such as sodium chloride.