Question

Define (A) Molecular formula (B) Isobar (C) Colloids​

Answer 1

Answer:

A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.

In chemistry, a colloid is a phase separated mixture in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance. Sometimes the dispersed substance alone is called the colloid; the term colloidal suspension refers unambiguously to the overall mixture.

Answer 2

(A)Molecular formula:-

Molecular formula is a symbolic representation of a molecule presenting the number and kind of atoms united chemically.

✦Molecular formula = n × empirical formula

Examples:

• $\sf H_2 O$  - water
• $\sf C_6 H_{12} O_6$ - glucose
• $\sf CO_2$-carbon-dioxide
• $\sf C_4H_{10}$ -butane

(B)Isobar:-

Atoms of different elements having different atomic number but same mass number are known as isobars.

➟They differ in chemical property but have same physical properties.

Example:

• $\sf ^{40}S, ^{40}Ar, ^{40}Ca, ^{40}Cl,^{40}K.$

Here,the nuclei contains 40 nucleons but they vary in numbers of protons&neutrons.

(C)Colloids:-

A colloid is a mixture in which tiny particles of one substance are scattered through another substance.

Examples:-

• Blood
• Milk
• Ink
• Soap solution

➟In a colloidal solution,the size of solute particle is intermediate between the particles in true solutions & suspensions.

➟The particle range in 1 and 1000 nanometer's in diameter.

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Know More:-

Isotopes: Atoms in which number of neutrons differs but the no.of. protons are same are known as isotopes.

Example:-

• Protium, deuterium, and tritium.

These are the three isotopes of hydrogen where the no.of protons is equal but no.of neutrons is not the same.

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