Allied solutions

Allied solutions

Grade 6

Introduction to Chemistry | Exercise

Question 10

Q10) State the contributions of

(a) Dimitri Mendeleev

(b) Antoine Lavoisier

(c) John Dalton - towards the development of Chemistry.

Solution :

(a) Dimitri Mendeleev

  • Formulated the periodic table of elements

  • Mendeleev arranged the dozens of known elements by atomic weights and also predicted the properties of certain unknown elements.

  • He also discovered the periodic law.

(b) Antoine Lavoiser

  • In 1778 he recognised and named oxygen.

  • In 1783 he recognised and named hydrogen.

  • He wrote the first extensive list of elements and helped to reform chemical nomenclature.

  • In 1774, he focused on the phenomenon of combustion. He conducted an experiment in which he heated pure mercury in a swan necked retort, leading to the discovery of oxygen.

(c) John Dalton

  • In 1803, he compiled his theory named as Dalton’s atomic theory.

  • In his theory he discussed Matter that consists of particles called atoms which are invisible and cannot be created or destroyed. Later, this theory was contradicted in certain aspects by “Modern Atomic theory”

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your chemistry exam ?

Learn from an expert tutor.

Book a free class now
subject-cta

Question 10

Q10) State the contributions of

(a) Dimitri Mendeleev

(b) Antoine Lavoisier

(c) John Dalton - towards the development of Chemistry.

Solution :

(a) Dimitri Mendeleev

  • Formulated the periodic table of elements

  • Mendeleev arranged the dozens of known elements by atomic weights and also predicted the properties of certain unknown elements.

  • He also discovered the periodic law.

(b) Antoine Lavoiser

  • In 1778 he recognised and named oxygen.

  • In 1783 he recognised and named hydrogen.

  • He wrote the first extensive list of elements and helped to reform chemical nomenclature.

  • In 1774, he focused on the phenomenon of combustion. He conducted an experiment in which he heated pure mercury in a swan necked retort, leading to the discovery of oxygen.

(c) John Dalton

  • In 1803, he compiled his theory named as Dalton’s atomic theory.

  • In his theory he discussed Matter that consists of particles called atoms which are invisible and cannot be created or destroyed. Later, this theory was contradicted in certain aspects by “Modern Atomic theory”

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your chemistry exam ?

Learn from an expert tutor.

Book a free class now
subject-cta
linkedin instgram facebook youtube
2020 © Quality Tutorials Pvt Ltd All rights reserved
linkedin instgram facebook youtube