History of the Atomic Model
What are the three subatomic particles present in atoms?
Protons, neutrons, and electrons
Which scientist theorized the planetary model of the atom?
Niels Bohr
Find the volume of a box with the following dimensions:
6cm x 4cm x 2cm
48cm3
What are the two types of pure substances?
Elements and Compounds
What are the 4 phases of matter?
Solid, liquid, gas/vapor, and plasma
Who discovered the electron?
J.J. Thomson
Describe J.J. Thomson's plum pudding model of the atom.
The atom is a ball of positive material with negative electrons floating around in it
What is the mass (in kg) of a guinea pig that weighs 10.235 N?
1.0443kg
Homogeneous and Heterogeneous
What determines the phase of matter an element exists in?
Internal energy / temperature
What does it mean that energy is quantized?
It is not continuous, it "comes in lumps"; you can have a smallest amount of energy
Who published the first periodic table of elements in 1869?
Dmitri Mendeleev
What is the density of a box with a mass of 18.0kg and a volume of 3.0m3?
6.0kg/m3
What type of mixture is a colloid?
Heterogeneous (ie: fog)
What is internal energy?
What did Robert Millikan discover through his oil drop experiment?
he determined the charge on individual electrons (1.6x10^-19 Coulombs)
Who produced the first atomic model in 1803?
John Dalton
What is the volume of a teddy bear with a mass of 5.0 kg and a density of 0.125kg/m3?
40m3
When making a batch of kool-aid, what is the solute and what is the solvent?
The kool-aid mix is the solute and the water is the solvent
What is it called when a substance converts from a liquid to a gas/vapor without reaching its boiling point first?
evaporation
Who performed the gold foil experiment? What did he discover because of it?
Ernest Rutherford; he discovered the atomic nucleus
John Dalton's 5 main points are:
All substances are composed of tiny, indivisible particles called atoms
All atoms of the same element are identical
Atoms of different elements have different weights
Atoms combine in whole number ratios to form compounds
Atoms are neither created nor destroyed in chemical reactions
Explain which of these are incorrect and why.
1 & 2 - answers may vary
What is the weight (in N) of a box with a density of 9.0 kg/m3 and a volume of 3.0m3?
260 N
What is an alloy?
solid homogeneous mixtures made of metal
What is the only common substance that displays sublimation in Earth's atmosphere?
CO2 (frozen = dry ice)