Exam 1 Chemistry FlashCards
What is scientific notation used to represent?
Both large and small numbers
What is the 4 Element Theory? What are the 4 elements?
That all matter is comprised of 4 elements.
Fire/Water/Air/Earth
What was the purpose of Alchemy?
To turn lead into gold
What are the 4 main aspects of the Atomic Theory of Matter
1) All matter is composed of small indivisible particles called atomons
2) Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.
3) Atoms cannot be created or destroyed
4) Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.
What are the 3 main problems with the Atomic Theory of Matter>
1) Atoms are not indivisible. They are subatomic particles
2) Atoms of the same element may have different mass (isotope)
3) atoms of different elements may have some similarities (isobars)
What are the 2 issues with the Plum Pudding Model?
1) the distribution of positive and negative particles was not uniform.
2) he didn’t consider the nucleaus
What was the Planetary Model?
Atoms are mostly empty space like the solar system
Are Protons positive, negative, or neutral?
Positive
Are neutrons positive, negative, or neutral?
neutral
Are Electrons positive, negative, or neutral?
Negative
What are three ways in which elements are named:
1) Alphabet/letter
2) Famous scientists
3) Latin/Ancient Roman
Define the Atomic Number
The # of protons in the nucleus in the atom
How do you find the number of protons>
Look at the atomic number
What does the Atomic Number tell you about the atom
Dictates the atoms type and element. all atoms of the same element have the same number of protons
Define the Mass Number:
The number of particles present in the nucleus
