All About Atoms
In an atom, which subatomic particle has a positive charge?
proton
What is a crystal?
A solid with a regular geometric shape because of the arrangement of its atoms
What is buoyant force?
A force caused by water pressure that pushes up on an object
On the periodic table, what are the vertical columns known as?
Groups
Which two subatomic particles are found in the nucleus of the atom?
proton and neutron
What are the units and formula for density?
density = mass/volume
g/ml or g/cm3
The depth and density of a liquid
20
What is a compound?
ex. H2O
At an atomic level, what two things determine the density of an object?
The mass of each atom and the spacing between those atoms
If an object had a density of 2.3 g/ml while water has a density of 1.0 g/ml, would this object sink or float?
sink
What is plasma?
gas that has increased in energy to the point that the atoms break apart and become charged particles called ions
What is Brownian motion?
The perpetual movement of tiny particles because the atoms that make it up are always moving, helped to prove that atoms are real
If 100 mL of syrup is 200 g, while 100 ml of water is 100 g, what is the syrup's specific gravity?
2, because it weighs 2 times more than the same amount of water
What is Archimedes principle?
An object in water is pushed up with the same amount of force as the weight of the water it displaced
How would you determine the density of an unknown object?
Find the volume by displacing water and find the mass using a scale, then divide the two to get the density
Explain Rutherford's gold foil experiment and what was his conclusion?
He shot alpha particles (radiation) through thin gold foil and saw that some of the particles bounced back instead of passing through; he discovered the atomic nucleus
Explain the relationship between surface area and volume when an object is scaled up.
What is Pascal's principle?
If you change the pressure of any point of an enclosed liquid, that pressure is applied to every point, allowing you to lift very heavy objects with minimal force
What is Hooke's law?
The force applied to a spring is directly proportional to the amount that it is stretched