Definitions
Molecule
Two or more atoms joined together.
How would a scientist write the molecule of water which is 2 Hydrogen and 1 Oxygen
H2O
You leave some ice out and a few minutes later is been seemingly replaced by a puddle of water. What type of phase change occured?
Melting
How are the particles in a solid arranged?
They are packed tightly together and can only move by vibrating
You are making some lemonade out of some powered mix. Is the lemonade powder the solute or solvent?
Solute
Model
A picture or object used to show something that is too small, big, or hard to see.
Draw a model of an molecule with 1 Hydrogen atom, 1 Nitrogen atom, and 1 Oxygen atom
Hold up your White Board
What happens to the mass of an object during phase change?
The mass remains the same
When you add heat, what happens to the particles in the object?
They become exited and start moving faster
You are adding some salt into your soup. Is the soup the solvent or solute?
Solvent
Phase Change
When matter changes from one state to another (like melting or freezing).
3 Oxygen and 2 Nitrogen
You set your cold drink out on a hot day and a few minutes later the outside of the glass is covered with water. What type of phase change occured?
Condensation
As you remove heat the kinetic energy of particles in phase change will what?
Decrease
You see an old iron fence rusted over. Clearly the iron has the property to rust. Is this property physical or chemical?
Chemical Property
Solubility
How well a substance can dissolve in a liquid (usually water).
A molecule has 4 Hydrogen atoms, and 2 Oxygen atoms. How would a scientists write this?
H4O2
Explain how the particles act during evaporation
Name all 6 different phase changes matter can go through?
Freezing, Melting, Evaporation, Condensation, Sublimation, and Disposition
You accidentally pour water into your bag of sugar. Which is the solute and which is the solvent?
The water is the solvent and the sugar is the solute
Physical Property
Traits of a substance that can be measured or observed without changing what the substance is.
What atoms are in the molecule H8N3O?
8 Hydrogen, 3 Nitrogen, 1 Oxygen
You put some dry ice into a fog machine and it starts going from a solid right to a gas. What phase change is occuring?
Sublimation
The water molecules are crashing into the top of the lid as they rise causing the lid to rattle
You put a pot on to boil. Is this a physical or chemical property?
Physical Property