Module..? Flashcards
What hypothesis did Dalton propose?
He proposed a hypothesis to account for the laws of chemical composition in terms of atoms
What are the postulates of Dalton’s Atomic Theory?
-Matter is composed of tiny particles called atoms
-Atoms cannot be destroyed, created, or split
-All atoms of any one element are identical
- A chemical reaction consists of rearranging of atoms from one combination to another
What are the misconceptions about Dalton’s atomic theory?
-Certain atoms can split, hence radioactivity
-Some elements have atoms that differ from each other as they have different masses.
What does the law of definite proportions state?
Elements react in simple, whole-number ratio
What is an atom?
This is the smallest part of an element that can take part in a chemical reaction. It is electrically neutral.
What structure does an atom have and what is it made up of?
A nuclear and electronic structure made up of protons, neutrons, and electrons
Where are the subatomic particles located?
-Protons and Neutrons: nucleus
-Electrons: shells (orbits around the nucleus)
How are neutrons affected in an electric field?
They are undeflected because they have no charge
How are protons and electrons affected in an electric field?
They are deflected in opposite directions with electrons being deflected more as they are the lightest of the two.
How do these particles travel?
At right angles to the field direction.
