Question

1. Define chemistry
2. What happens to a substance after a physical change? What happens in a chemical change?
3. What is matter?
4. What is a base metal?
5. What is meant by the elixir of life?
6. Who was the first to prepare hydrogen? Who prepared oxygen for the first time?
2. Who disproved the four-element theory of the Grecks?
8. Who put forward the periodic table?
9. Who gave the atomic theory?​

Answer 1

Answer:

some short answers

Explanation:

1. the scientific study of the structure of substances and what happens to them in different conditions or when mixed with each other
2. The most important thing for your to remember is that in a physical change the composition of a substance does not change and in a chemical change the composition of a substance does change. Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances.
3. anything that occupy in space and having mass and volume is called matter.
4. Base metals are common metals that tarnish, oxidize, or corrode relatively quickly when exposed to air or moisture. They are widely used in commercial and industrial applications, such as construction and manufacturing. Base metals include lead, copper, nickel, and zinc.
5. elixir of immortality.The elixir of life, also known as elixir of immortality and sometimes equated with the name philosopher's stone, is a potion that supposedly grants the drinker eternal life and/or eternal youth.Alchemists in various ages and cultures sought the means of formulating the elixir.
6. .

• Hydrogen was discovered by the English physicist Henry Cavendish in 1766. Scientists had been producing hydrogen for years before it was recognized as an element. Written records indicate that Robert Boyle produced hydrogen gas as early as 1671 while experimenting with iron and acids.
• carl wilhelm scheele
• carl wilhelm scheele (1742–1786) (Fig. 1) was a Swedish-German chemist who has the distinction of being the first person to prepare oxygen and describe some of its most important properties.

1. This elixir of life never happened either. The disproving of Aristotle's four-elements theory and the publishing of the book, The Skeptical Chemist (by Robert Boyle), combined to destroy this early form of chemistry.
2. Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements.
3. John Dalton FRS was an English chemist, physicist, and meteorologist. He is best known for introducing the atomic theory into chemistry, and for his research into colour blindness, sometimes referred to as Daltonism in his honour