Homoatomic and Heteroatomic Molecules

Q.

The chemical symbol for nitrogen gas is.

1. Ni

2. N₂

3. N⁺

4. N

Q.

Differentiate between symbol and formula.

Q.

Define the formula mass of ionic compounds.

Q.

Write the Chemical Formula of Copper Sulphite.

Q.

Chemical symbols are the brief notation used by chemists to express the full and lengthy names of the elements. Similarly, the chemical formula is the brief representation of a chemical compound. The chemical formula tells us the actual number of atoms of the elements present in one molecule of the compound. The formula of the compound is written from the knowledge of the valencies of the radicals (or elements) forming the compound.

Answer the following questions after reading the passage.

(1) Write symbols of two elements whose symbols contain the 2nd alphabet of the English language.

(2) Write the formula of oxalate of calcium.

(3) Write the name and symbol of the element whose symbol contains the first and third letter of its name.

(4) How many compounds from the following list have an equal number of atoms in their molecules/ formula units?

Iron (II) sulfate, aluminum sulfate, iron (III) sulfate, barium nitrate, chromium oxalate, magnesium carbonate

(a) 3 (b) 5 (c) 4 (d) 2

Q. Cyanide ion consists of which of the following atoms?

1. Carbon and nitrogen
2. Carbon and oxygen
3. Hydrogen and nitrogen
4. Oxygen and nitrogen

Q. Which of the following is a triatomic molecule?​

1. Helium​
2. Hydrogen​
3. Glucose​
4. Carbon dioxide​

Q.

What should we know to write the chemical formula of a compound?

Q.

The chemical symbol for nitrogen gas- is :

1. Ni

2. ${\mathrm{N}}_2$

3. ${\mathrm{N}}^{+}$

4. N