Does it MATTER?
An element is a substance that CAN or CANNOT be chemically divided into other substances
CANNOT
Which of the following mixtures is homogeneous?
Salad dressing
Tap water
Oil and vinegar
Sand
Tap water
Name 2 points from Dalton's atomic model
1.All matter is made of atoms that cannot be created, destroyed oe divided into smaller parts.
2.All atoms of the same element are identical(same mass and properties).
3. Atoms of different elements are different (different masses and properties)
4. During a chemical reaction, atoms separate, combine OR rearrange in a different way to form new substances.
Which separation technique is the fastest way to separate a homogeneous mixture?
Filtration, Decantation, Centrifugation, Distillation
Distillation
118
True or False: when a transformation doesn't change the nature of the molecules in matter, it is called a "physical change."
True
When a transformation changes the nature of the molecules in matter, it is called what?
A chemical change