Name That Scientist
Who proposed the first atomic model based on experimental evidence?
John Dalton
Which theory believes matter can be continuously subdivided without end?
The continuous theory of matter
The atomic number tells us how many ________ there are in an element?
Protons
How many significant figures are in 63,000 kg?
2
How many grams are in 152 kg?
152,000 grams
Who discovered philosophical atomism?
Democritus
Which theory holds that matter is made up of separate, discrete particles?
atomism
In atomic notation, what does the "Z" represent?
Protons
What is the isotope notation for Sodium - 24?
24/11 Na
A frozen turkey thaws. Is that a physical or chemical change?
Physical change
Who used cathode rays?
J.J. Thomson
Whose model of the atom was also known as the plum pudding model?
J.J. Thomson
Weighted averages of isotopes of an element determine its ____________?
Atomic Mass
How many protons, neutrons, and electrons are present in 5927Co?
27 protons, 32 neutrons, and 27 electrons
Convert 0.025 into scientific notation.
2.5 x 10-2
Which French chemist discovered the law of definite proportions?
Joseph Proust
What is the first law of thermodynamics?
The law that states matter/energy can't be created or destroyed but can change forms.
Atoms (elements) with the same number of protons but different number of neutrons are __________?
Isotopes
DAILY DOUBLE QUESTION!
Find the volume in milliliters occupied by 454 grams of copper. Copper has a density of 8.92 g/mL.
50.9 mL
Name 5 of the homonuclear diatomics.
Nitrogen, Oxygen, chlorine, Fluorine, bromine, iodine, and hydrogen.
Who discovered x-rays in 1895?
Wilhelm Roentgen
What is the 2nd law of thermodynamics?
The Law of Entropy - Entropy is always increasing in a system. The amount of useable energy becomes less and less as the energy spreads out. (going from order to more disorder)
Our textbook classifies matter into two major categories. What are they?
Pure Substances and Mixtures
Testing has shown that 75.80% of chlorine exists as Cl-35 (34.969 amu) and that 24.20% of chlorine exists as Cl-37 (36.966 amu). Calculate chlorine's atomic mass.
35.45 amu
DAILY DOUBLE QUESTION
What is the symbol for Lead?
Pb