IBC Quiz Chap 4/5

4.1

An atom is the smallest particle of an element that retains its identity in a chemical reaction

4.1

He believed that atoms were indivisible and indestructible

4.1

By using experimental methods, Dalton transformed Democritus’ ideas on atoms into a scientific theory.

4.1

1. All elements are composed of tiny indivisible particles called atoms
2. Atoms of the same element are identical. The atoms of any one element are different from those of any other element
3. Atoms of different elements can physically mix together or can chemically combine in simple whole number ratios to form compounds
4. Chemical reactions occur when atoms are separated or joined or rearranged. Atoms of one element however are never changed into atoms of another element as a result of a chemical reaction,

4.1

A scanning tunneling microscope can be used to observe atoms.

4.1

5x10 (-11) m to 2 x 10 (-10) m

4.1

Calculate the mass of a single atom

4.2

– A negatively charged subatomic particle

4.2
- are the positive charged subatomic particle

4.2

– are subatomic particles with no charge

4.2

– is the tiny central core of an atom and is composed of protons and neutrons.

4.2

Electrons
Neutrons
Protons

4.2

In the nuclear atom, the protons and neutrons are located in the nucleus. The elections are distributed by around the nucleus and occupy almost all the volume of the atom

4.2

They figured out how to calculate the mass of an electron.

They electron carries one unit of negative charge and its mass is 1/1840 just like the mass of a hydrogen atom.

4.2

The lack of deflection during the gold foil experiment. The experiment showed the alpha rays passed thru the gold foil with little deflection.