Density
This is the formula for density.
(Sometimes referred to as the broken heart)
What is d = m / v?
Who said the atom was indivisible and indestructible?
Who is Democritus?
Famed for his discovery of the electron.
Who is J.J. Thomson?
The charge of an electron is _____ and the charge of a proton is _____.
What is -1?
What is +1?
If the mass of an object is 100 grams and the volume of the object is 10 mL, the density of the object is
10 g / mL
One of these four claims was later found to be false, which claim was it?
Atoms are indivisible.
An important consequence of this experimental design was the understanding of the existence of charges. As the plates shifted position, so did the direction of the beam.
What is the Cathode Ray?
Which subatomic particle is the lightest?
What is an electron?
If the density of an object is 20 g/mL and the mass of the same object is 20 grams, what is the volume?
V = 1 mL
This thinker lacked the following to maintain his idea of the atom:
- able to explain chemical behavior
- support by experimental data
Who is Democritus?
Opposite charges will _____ and like charges will _____.
What is attract?
What is repel?
What is neutral?
A cube has the length of measure 2 cm. The mass of this cube is 16 grams, what is the density of the cube?
2 g/mL
This scientist provided the following claim:
"Atoms of different elements can physically mix or can combine in simple whole-number ratios to form compounds."
Who is Dalton?
What did the plum-pudding model detail?
Positive (protons) and negative charges (electrons) are evenly distributed throughout the atom similar to how a raisin lumped in dough.
Chemical reactions occur when _____ are ______ from each other, _____, or ______ in different combinations.
a. atoms
b. separated
c. joined
d. rearranged
A graduated cylinder has 2 mL of water. After placing an irregularly shaped stone in the graduate cylinder, the volume of the graduated cylinder was 5 mL. If the stone measured 30 grams, what was the density of the stone?
10 g/mL
We saw an example of mercury droplets in a petri dish. We noticed that mercury was silver regardless of the size of the droplet and that it mostly maintained a spherical shape. What could be said of any sample of an element?
Describe Rutherford's Atomic Model.
The atom is:
- mostly empty space
- positive charge and mass is concentrated in the center of the atom
- center is called a nucleus and is composed of protons and neutrons
- the electrons are distributed across the nucleus and occupy the entire volume of an atom
How was the plum-pudding model disproved?