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Quarter 1 Test Prep

Preparation for Quarter 1 Chemistry Test

What is the unit of temperature most commonly used by scientists? Celcius
The atomic number of an atom equals what? The number of protons
What does the sum of the protons and neutrons of an isotope equal? The atomic mass number
How many protons does Carbon-14 contain? 6
How does the energy of an electron changes when it goes from energy level 2 to energy level 4? It increases
What does an electron give off when it goes from a higher to a lower energy level? a photon
The principle quantum number indicates what property of an electron? The energy level
What color of light has the highest energy? Violet
What color of light has the lowest energy? Red
If you can determine the exact position of an electron, what are you not able to determine The speed
What are valence electrons? Electrons in the outermost energy level
Do electrons act like particles or like waves? They act like particles and waves.
What is the principle that says you cannot determine both speed and location of an electron at the same time? Heisenberg uncertainty principle
How does the quantum mechanical model describe the positions of electrons? In terms of probability
What happens when an atom drops to a lower energy level? It loses energy
What scientist believed that all atoms of one element were identical? Dalton
What subatomic particle has almost the same mass as a proton? The neutron
Created by: mmetzler



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