Answer is: Democritus.
Democritus (c.460 — c.370 BC) was an Ancient Greek philosopher.
According to his atomic theory:
1) everything is composed of atoms.
2) atoms are physically indivisible
3) there is empty space between atoms.
4) atoms are indestructible and in motion.
5) there is an infinite number of atoms, which differ in shape and size.
Democritus was the first to propose the existence of atoms. Option A is the correct answer.
Thus, In contrast to the outdated idea that matter might be divided into any arbitrarily small quantity, atomic theory argues that matter is formed of discrete units called atoms.
It was first introduced as a philosophical idea by Democritus in ancient Greece and India, and it later became a widely accepted scientific theory. Chemical advancements at the time demonstrated that matter did indeed behave as if it were composed of particles.
A fundamental physical quality of matter is mass. The term "atomic mass" refers to the weight of an atom or molecule. To determine the average mass of elements and molecules as well as to resolve stoichiometry issues, the atomic mass is used.
Thus, Democritus was the first to propose the existence of atoms.
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Answer:
Decrease order of speed of atoms in solid state, liquid state and gaseous states: gas > liquid> solid
Decreasing order of space of atoms in solid state, liquid state and gaseous states: gas > liquid> solid
Explanation:
Solid state : In this state, the particles are closely packed and does not have any space between them. They have least kinetic energy due to restricted movement. This state has a definite shape and volume.
Liquid state : In this state, particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another and thus have higher kinetic energy as compared to solids. This state has a definite volume but does not have a fixed shape.
Gaseous state : In this state, particles are loosely arranged and have a lot of space between them. They have highest kinetic energy. This state has indefinite volume as well as shape.
Decrease order of speed of atoms in solid state, liquid state and gaseous states: gas > liquid> solid
Decreasing order of space of atoms in solid state, liquid state and gaseous states: gas > liquid> solid
All fossil fuels contains hydrocarbons in it. Amongst the given options hydrogen is the correct answer. Except that it contains carbon in it. Hydrocarbons are those class of compounds which contains hydrogen and carbon as element in it.
They are considered to be good fuels because they naturally bring out complete combustion as they contain hydrogen and carbon in its compound form.
Answer:
I took the test. The answer is C. Sawdust.
Explanation:
Answer: C
Explanation: Because it cannot, no one can create or destroy an atom, it just moves. It either bonds to another atom or it roams freely.
Answer : Gaseous water molecules condense when they cooled. Liquid water molecules evaporate when they heated.
Explanation :
Condensation : It is a process in which a phase changes from gaseous state to liquid state. This process occurs when the water molecules in the air cool down and they join together to form liquid water.
Evaporation : It is a process in which a phase changes from liquid state to gaseous state. This process occurs when the water is heated, the molecules in the water move and vibrate quickly that they escape into the atmosphere as water vapor.