Question

1. What are compounds? How are they formed? Explain giving an example.​

Answer 1

Answer:

A compound is a substance formed when two or more elements are chemically bonded together

Answer:

ans)a)

Sodium has one electron in its valence shell and needs to remove it to attain noble gas configuration. So, it gets ionizes and gives one electron to another compound to form a compound. Thus, it has a valency of 1 and is called as a monovalent atom.

ans)b)

M is bivalent metal means it has valency 2. Beryllium, Magnesium, Calcium,Scandium, Barium, Radium are metals having valency 2.

To write chemical formula of any compound the simplest method is criss cross method.

In this method

Step 1: we will take Magnesium to form compound with sulphate.

Step 2: First we should know the component of compound that are magnesium and sulphur. Step 3: Now we have to write the valency of both components that is of magnesium 2 as it is bivalent and of sulphur is 2 as it belongs to halogen family.

Step 4: Now we have to criss cross.

We get MgSO4

ans)c)

Atomic mass is the is the sum of the electrons and the neutrons in the atom. Number of electrons is the atomic number. Hence to determine the atomic mass the reference of the atom is required. Example to find the atomic mass of atom magnesium Mg we need to know the atomic number of magnesium.

ans)d)

931.49410242(28) The dalton or unified atomic mass unit (symbols: Da or u) is a unit of mass widely used in physics and chemistry. It is defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.

ans)e)

A mole corresponds to the mass of a substance that contains 6.023 x 1023 particles of the substance. The mole is the SI unit for the amount of a substance. Its symbol is mol. By definition: 1 mol of carbon-12 has a mass of 12 grams and contains 6.022140857 x 1023 of carbon atoms (to 10 significant figures).

plz plz plz mark me as brainliest for my hard work

Answer 2

Answer:

A compound is a substance formed when two or more chemical elements are chemically bonded together.

Example 1: Pure water is a compound made from two elements - hydrogen and oxygen.

The ratio of hydrogen to oxygen in water is always 2:1. Each molecule of water contains two hydrogen atoms bonded to a single oxygen atom

Explanation:

I hope it will be help you...