SCH4U Final Exam with questions and actual
answers(verified answers)@2026!!!!
What are the main ideas of the Dalton (Billiard Ball) model? - ANSWERS💫✔️-1. All matter is made up of
tiny indivisible particles called atoms
2. All atoms of the same element are the same in size, mass, etc
3. Atoms of different elements are different in size and mass
4. Atoms of different elements combine in small whole number ratios to form molecules or compounds
5. In chemical reactions, atoms are not created or destroyed, they are bonded or un-bonded
What are the main ideas of the Thomson (raisin bun) model? - ANSWERS💫✔️-1. The atom is a spherical
cloud of positive charge with negatively charged electrons embedded in it
2. The amount of positive charge must equal the amount of negative charge so the atom is neutral
What are the main ideas of the Rutherford model? - ANSWERS💫✔️-1. Discovered using the gold foil
experiment
2. The atom is mostly empty space
3. Most of the mass is concentrated in a small, dense nucleus
4. Electrons move around the nucleus like planets around the sun
5. Problem with this model is that the e revolving around should emit radiation and lose NRG, slow
down and spiral down and ultimately fall into the nucleus. This is UNTRUE
What are the main ideas of the Bohr (energy level) model? - ANSWERS💫✔️-1. electrons must travel
around the nucleus in specific energy levels
2. If an atom is excited, electrons absorb a certain amount of energy and are boosted to a higher energy
level
3. electrons later drop back down to a lower state releasing energy of a colour equal to the amount of
energy released
4. the number of e in each energy level, n, is equal to 2n^2
What are the issues with the Bohr model experimentally? Calculations - ANSWERS💫✔️-The calculated
line spectra results for atoms with more electrons didn't match observations, as they only work for 1
answers(verified answers)@2026!!!!
What are the main ideas of the Dalton (Billiard Ball) model? - ANSWERS💫✔️-1. All matter is made up of
tiny indivisible particles called atoms
2. All atoms of the same element are the same in size, mass, etc
3. Atoms of different elements are different in size and mass
4. Atoms of different elements combine in small whole number ratios to form molecules or compounds
5. In chemical reactions, atoms are not created or destroyed, they are bonded or un-bonded
What are the main ideas of the Thomson (raisin bun) model? - ANSWERS💫✔️-1. The atom is a spherical
cloud of positive charge with negatively charged electrons embedded in it
2. The amount of positive charge must equal the amount of negative charge so the atom is neutral
What are the main ideas of the Rutherford model? - ANSWERS💫✔️-1. Discovered using the gold foil
experiment
2. The atom is mostly empty space
3. Most of the mass is concentrated in a small, dense nucleus
4. Electrons move around the nucleus like planets around the sun
5. Problem with this model is that the e revolving around should emit radiation and lose NRG, slow
down and spiral down and ultimately fall into the nucleus. This is UNTRUE
What are the main ideas of the Bohr (energy level) model? - ANSWERS💫✔️-1. electrons must travel
around the nucleus in specific energy levels
2. If an atom is excited, electrons absorb a certain amount of energy and are boosted to a higher energy
level
3. electrons later drop back down to a lower state releasing energy of a colour equal to the amount of
energy released
4. the number of e in each energy level, n, is equal to 2n^2
What are the issues with the Bohr model experimentally? Calculations - ANSWERS💫✔️-The calculated
line spectra results for atoms with more electrons didn't match observations, as they only work for 1
