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19 Cards in this Set

  • Front
  • Back
What is matter?
Anything that has mass and takes up space
What is a substance?
A single kind of matter that is pure - meaning it always has a specific makeup(composition) and a specific set of properties
Every form of matter has what two properties?
physical properties and chemical properties
What is a physical property?
A characteristic of a pure substance that can be observed without changing it into another substance
What are examples of physical properties?
Density
Melting point
Texture and Color
flexibility
What is a chemical property?
A characteristic of a pure substance that describes its ability to change into different substances
Waht are examples of chemical properties
flammability
Ability to react9rust forming on a car
What is an element?
An element is a pure Asubstance that cannot be broken down into any other substances by chemical or physical change
Waht is an atom?
Particles of elements-the basic particle from which all elements are made
What is a chemical bond?
When atoms combine, they from a chemical bond, which is a force of attraction between two atoms.
What is a molecule?
A larger particle formed from the combination of atoms
What are examples of molecules?
Water molecule- Two hydrogen atoms plus on e oxygen atom(H20)
Oxygen molecule - O2
Carbondioxide molecule - CO2
What is a compound?
A pure substance made up of 2 or moreelements chemically combined in a set ratio. A compound may be reperesented by a chemical formula
What is a chemical formula?
It shows the elements in the compound and the ratio of atoms (example H2O)
True or False?
When compounds chemically combine, they form compound s having properties different from those of the combined substances.
True
What is a mixture?
A mixture is made up of two or more substances --elements, compounds or both-that are togerther in the same place but are not chemically combined.
What is a heterogeneous mixture?
A mixture where you can see the individual parts - Example is a salad, , ,can see lettuece, tomatoes, etc
What is a homogeneous mixture?
Substances so evenly mixed you cannot see the individual parts Example - solutions such as sugar mixed into water
Name four methods used to separate mixtures?
Magnetic attraction
Fitration
Distillation
Evaporation