Particle Theory
Describe the shape of a solid? Are the particles fixed or can be changed?
The particles of a solid are fixed
What is the name of the number at the top of an element?
Atomic Number - Refers to it's order in the periodic table.
The smallest part of an element is called ...
Atom
State the element type, and how many of each atom are in the example below:
NaCl
1 Sodium
1 Chloride
2 Atoms
Is cutting a log in half a chemical or physical change? Explain Why.
Physical Change - There is no change to the chemical composition of the log.
Gas particles can move f_______.
Gas particles collide and can move freely. They can expand and compress.
Every Element begins with what?
A Capital letter
When two or more atoms bond together they are called ...
Molecules
State the element type, and how many of each atom are in the example below:
H₂O
2 Hydrogen
1 Oxygen
3 total
Is ice melting an example of a physical or chemical change? Explain Why.
Physical Change - The chemical composition does not change, regardless of its form. H2O
Describe the attraction of liquid particles. Are they stronger or weaker than Solid or Gas particles.
Liquid particles have moderate attraction. They are weaker than solid particles but stronger than gas particles.
The number at the bottom of the element represents what?
Atomic Mass - How heavy the element is.
When two or more different atoms bond together they are called ...
Compound
State the element type, and how many of each atom are in the example below:
H₂SO₄
2 Hydrogen
1 sulfer
4 Oxygen
Cooking pancakes, chemical or physical and why?
chemical - changes colour creating new compounds (browning, aroma)
The _______ point is the temperature at which a solid turns into a liquid
Melting Point
DO NOT LOOK AT THE PERIODIC TABLE!!
What Element is S
Sulfur
What is the difference between a molecule and a mixture?
A molecules atoms are chemically bonded together, in a mixture, the particles are physically mixed together
CH₄
1 Carbons
4 Hydrogens
Burning wood in a campfire, chemical or physical change and why?
New substances created - colour change, smell, smoke. Cannot return to being wood.
The _______ _____ is the temperature at which a liquid turns into a gas
Boiling Point
DO NOT LOOK AT THE PERIODIC TABLE!!
What Element is Ne
Neon
Draw an Example on the board of a mixture including molecules and compounds
Teacher will check response
Ca₃(PO₄)₂
3 Calcium
2 Phosphorus
8 Oxygen
Photosynthesis, chemical or physical change and why?
New products created