Matter
What is the step in scientific method before doing an experiment?
Construct a Hypothesis
Which subatomic particle is negative?
Electron
The number of electron shells is determined by the...
Periods
What effects the rate at which a compound breaks down?
Temperature
How do particles behave in a liquid state of matter?
Free flowing with moderate collisions.
What is the over charge of the nucleolus of an atom?
Positive (protons + neutrons)
Elements with a full shell of valence electron are very reactive or non reactive?
Non-reactive
What to we call a group of elements that are combined together?
Chemical Formula
Heterogeneous Mixtures
What tells you the number of protons & electrons?
Atomic #
The groups on the periodic table show you the....of an element.
Valence Electrons
How do Biodegradable plastics break down?
With the use of oxygen, bacteria and fungi.
What is the difference between physical and chemical changes?
FALSE
Which Group of Elements is this?
NOT able to conduct electricity or heat very well
very brittle
Do not reflect light.
Non-Metals
When elements become compounds what do they share?
Valence Electrons
Calculate the Density of this Object. Mass = 4.2 Volume = 7.8
Will it float?
0.5 and Yes
Where can you find the valence electrons of an atom?
Outer most electron shell
Which element is most reactive?
- Lithium
- Beryllium
- Boron
Lithium
What is it called when the total charge of a compound is positive?